xenial (1) perltidy.1p.gz

Provided by: perltidy_20140328-1_all bug

NAME

       perltidy - a perl script indenter and reformatter

SYNOPSIS

           perltidy [ options ] file1 file2 file3 ...
                   (output goes to file1.tdy, file2.tdy, file3.tdy, ...)
           perltidy [ options ] file1 -o outfile
           perltidy [ options ] file1 -st >outfile
           perltidy [ options ] <infile >outfile

DESCRIPTION

       Perltidy reads a perl script and writes an indented, reformatted script.

       Many users will find enough information in "EXAMPLES" to get started.  New users may benefit from the
       short tutorial which can be found at http://perltidy.sourceforge.net/tutorial.html

       A convenient aid to systematically defining a set of style parameters can be found at
       http://perltidy.sourceforge.net/stylekey.html

       Perltidy can produce output on either of two modes, depending on the existence of an -html flag.  Without
       this flag, the output is passed through a formatter.  The default formatting tries to follow the
       recommendations in perlstyle(1), but it can be controlled in detail with numerous input parameters, which
       are described in "FORMATTING OPTIONS".

       When the -html flag is given, the output is passed through an HTML formatter which is described in "HTML
       OPTIONS".

EXAMPLES

         perltidy somefile.pl

       This will produce a file somefile.pl.tdy containing the script reformatted using the default options,
       which approximate the style suggested in perlstyle(1).  The source file somefile.pl is unchanged.

         perltidy *.pl

       Execute perltidy on all .pl files in the current directory with the default options.  The output will be
       in files with an appended .tdy extension.  For any file with an error, there will be a file with
       extension .ERR.

         perltidy -b file1.pl file2.pl

       Modify file1.pl and file2.pl in place, and backup the originals to file1.pl.bak and file2.pl.bak.  If
       file1.pl.bak and/or file2.pl.bak already exist, they will be overwritten.

         perltidy -b -bext='/' file1.pl file2.pl

       Same as the previous example except that the backup files file1.pl.bak and file2.pl.bak will be deleted
       if there are no errors.

         perltidy -gnu somefile.pl

       Execute perltidy on file somefile.pl with a style which approximates the GNU Coding Standards for C
       programs.  The output will be somefile.pl.tdy.

         perltidy -i=3 somefile.pl

       Execute perltidy on file somefile.pl, with 3 columns for each level of indentation (-i=3) instead of the
       default 4 columns.  There will not be any tabs in the reformatted script, except for any which already
       exist in comments, pod documents, quotes, and here documents.  Output will be somefile.pl.tdy.

         perltidy -i=3 -et=8 somefile.pl

       Same as the previous example, except that leading whitespace will be entabbed with one tab character per
       8 spaces.

         perltidy -ce -l=72 somefile.pl

       Execute perltidy on file somefile.pl with all defaults except use "cuddled elses" (-ce) and a maximum
       line length of 72 columns (-l=72) instead of the default 80 columns.

         perltidy -g somefile.pl

       Execute perltidy on file somefile.pl and save a log file somefile.pl.LOG which shows the nesting of
       braces, parentheses, and square brackets at the start of every line.

         perltidy -html somefile.pl

       This will produce a file somefile.pl.html containing the script with html markup.  The output file will
       contain an embedded style sheet in the <HEAD> section which may be edited to change the appearance.

         perltidy -html -css=mystyle.css somefile.pl

       This will produce a file somefile.pl.html containing the script with html markup.  This output file will
       contain a link to a separate style sheet file mystyle.css.  If the file mystyle.css does not exist, it
       will be created.  If it exists, it will not be overwritten.

         perltidy -html -pre somefile.pl

       Write an html snippet with only the PRE section to somefile.pl.html.  This is useful when code snippets
       are being formatted for inclusion in a larger web page.  No style sheet will be written in this case.

         perltidy -html -ss >mystyle.css

       Write a style sheet to mystyle.css and exit.

         perltidy -html -frm mymodule.pm

       Write html with a frame holding a table of contents and the source code.  The output files will be
       mymodule.pm.html (the frame), mymodule.pm.toc.html (the table of contents), and mymodule.pm.src.html (the
       source code).

OPTIONS - OVERVIEW

       The entire command line is scanned for options, and they are processed before any files are processed.
       As a result, it does not matter whether flags are before or after any filenames.  However, the relative
       order of parameters is important, with later parameters overriding the values of earlier parameters.

       For each parameter, there is a long name and a short name.  The short names are convenient for keyboard
       input, while the long names are self-documenting and therefore useful in scripts.  It is customary to use
       two leading dashes for long names, but one may be used.

       Most parameters which serve as on/off flags can be negated with a leading "n" (for the short name) or a
       leading "no" or "no-" (for the long name).  For example, the flag to outdent long quotes is -olq or
       --outdent-long-quotes.  The flag to skip this is -nolq or --nooutdent-long-quotes or
       --no-outdent-long-quotes.

       Options may not be bundled together.  In other words, options -q and -g may NOT be entered as -qg.

       Option names may be terminated early as long as they are uniquely identified.  For example, instead of
       --dump-token-types, it would be sufficient to enter --dump-tok, or even --dump-t, to uniquely identify
       this command.

   I/O control
       The following parameters concern the files which are read and written.

       -h,    --help
           Show summary of usage and exit.

       -o=filename,    --outfile=filename
           Name of the output file (only if a single input file is being processed).  If no output file is
           specified, and output is not redirected to the standard output (see -st), the output will go to
           filename.tdy. [Note: - does not redirect to standard output. Use -st instead.]

       -st,    --standard-output
           Perltidy must be able to operate on an arbitrarily large number of files in a single run, with each
           output being directed to a different output file.  Obviously this would conflict with outputting to
           the single standard output device, so a special flag, -st, is required to request outputting to the
           standard output.  For example,

             perltidy somefile.pl -st >somefile.new.pl

           This option may only be used if there is just a single input file.  The default is -nst or
           --nostandard-output.

       -se,    --standard-error-output
           If perltidy detects an error when processing file somefile.pl, its default behavior is to write error
           messages to file somefile.pl.ERR.  Use -se to cause all error messages to be sent to the standard
           error output stream instead.  This directive may be negated with -nse.  Thus, you may place -se in a
           .perltidyrc and override it when desired with -nse on the command line.

       -oext=ext,    --output-file-extension=ext
           Change the extension of the output file to be ext instead of the default tdy (or html in case the
           --html option is used).  See "Specifying File Extensions".

       -opath=path,    --output-path=path
           When perltidy creates a filename for an output file, by default it merely appends an extension to the
           path and basename of the input file.  This parameter causes the path to be changed to path instead.

           The path should end in a valid path separator character, but perltidy will try to add one if it is
           missing.

           For example

            perltidy somefile.pl -opath=/tmp/

           will produce /tmp/somefile.pl.tdy.  Otherwise, somefile.pl.tdy will appear in whatever directory
           contains somefile.pl.

           If the path contains spaces, it should be placed in quotes.

           This parameter will be ignored if output is being directed to standard output, or if it is being
           specified explicitly with the -o=s parameter.

       -b,    --backup-and-modify-in-place
           Modify the input file or files in-place and save the original with the extension .bak.  Any existing
           .bak file will be deleted.  See next item for changing the default backup extension, and for
           eliminating the backup file altogether.

           A -b flag will be ignored if input is from standard input or goes to standard output, or if the -html
           flag is set.

           In particular, if you want to use both the -b flag and the -pbp (--perl-best-practices) flag, then
           you must put a -nst flag after the -pbp flag because it contains a -st flag as one of its components,
           which means that output will go to the standard output stream.

       -bext=ext,    --backup-file-extension=ext
           This parameter serves two purposes: (1) to change the extension of the backup file to be something
           other than the default .bak, and (2) to indicate that no backup file should be saved.

           To change the default extension to something other than .bak see "Specifying File Extensions".

           A backup file of the source is always written, but you can request that it be deleted at the end of
           processing if there were no errors.  This is risky unless the source code is being maintained with a
           source code control system.

           To indicate that the backup should be deleted include one forward slash, /, in the extension.  If any
           text remains after the slash is removed it will be used to define the backup file extension (which is
           always created and only deleted if there were no errors).

           Here are some examples:

             Parameter           Extension          Backup File Treatment
             <-bext=bak>         F<.bak>            Keep (same as the default behavior)
             <-bext='/'>         F<.bak>            Delete if no errors
             <-bext='/backup'>   F<.backup>         Delete if no errors
             <-bext='original/'> F<.original>       Delete if no errors

       -w,    --warning-output
           Setting -w causes any non-critical warning messages to be reported as errors.  These include messages
           about possible pod problems, possibly bad starting indentation level, and cautions about indirect
           object usage.  The default, -nw or --nowarning-output, is not to include these warnings.

       -q,    --quiet
           Deactivate error messages and syntax checking (for running under an editor).

           For example, if you use a vi-style editor, such as vim, you may execute perltidy as a filter from
           within the editor using something like

            :n1,n2!perltidy -q

           where "n1,n2" represents the selected text.  Without the -q flag, any error message may mess up your
           screen, so be prepared to use your "undo" key.

       -log,    --logfile
           Save the .LOG file, which has many useful diagnostics.  Perltidy always creates a .LOG file, but by
           default it is deleted unless a program bug is suspected.  Setting the -log flag forces the log file
           to be saved.

       -g=n, --logfile-gap=n
           Set maximum interval between input code lines in the logfile.  This purpose of this flag is to assist
           in debugging nesting errors.  The value of "n" is optional.  If you set the flag -g without the value
           of "n", it will be taken to be 1, meaning that every line will be written to the log file.  This can
           be helpful if you are looking for a brace, paren, or bracket nesting error.

           Setting -g also causes the logfile to be saved, so it is not necessary to also include -log.

           If no -g flag is given, a value of 50 will be used, meaning that at least every 50th line will be
           recorded in the logfile.  This helps prevent excessively long log files.

           Setting a negative value of "n" is the same as not setting -g at all.

       -npro  --noprofile
           Ignore any .perltidyrc command file.  Normally, perltidy looks first in your current directory for a
           .perltidyrc file of parameters.  (The format is described below).  If it finds one, it applies those
           options to the initial default values, and then it applies any that have been defined on the command
           line.  If no .perltidyrc file is found, it looks for one in your home directory.

           If you set the -npro flag, perltidy will not look for this file.

       -pro=filename or  --profile=filename
           To simplify testing and switching .perltidyrc files, this command may be used to specify a
           configuration file which will override the default name of .perltidyrc.  There must not be a space on
           either side of the '=' sign.  For example, the line

              perltidy -pro=testcfg

           would cause file testcfg to be used instead of the default .perltidyrc.

           A pathname begins with three dots, e.g. ".../.perltidyrc", indicates that the file should be searched
           for starting in the current directory and working upwards. This makes it easier to have multiple
           projects each with their own .perltidyrc in their root directories.

       -opt,   --show-options
           Write a list of all options used to the .LOG file.  Please see --dump-options for a simpler way to do
           this.

       -f,   --force-read-binary
           Force perltidy to process binary files.  To avoid producing excessive error messages, perltidy skips
           files identified by the system as non-text.  However, valid perl scripts containing binary data may
           sometimes be identified as non-text, and this flag forces perltidy to process them.

FORMATTING OPTIONS

   Basic Options
       --notidy
           This flag disables all formatting and causes the input to be copied unchanged to the output except
           for possible changes in line ending characters and any pre- and post-filters.  This can be useful in
           conjunction with a hierarchical set of .perltidyrc files to avoid unwanted code tidying.  See also
           "Skipping Selected Sections of Code" for a way to avoid tidying specific sections of code.

       -i=n,  --indent-columns=n
           Use n columns per indentation level (default n=4).

       -l=n, --maximum-line-length=n
           The default maximum line length is n=80 characters.  Perltidy will try to find line break points to
           keep lines below this length. However, long quotes and side comments may cause lines to exceed this
           length.  Setting -l=0 is equivalent to setting -l=(a large number).

       -vmll, --variable-maximum-line-length
           A problem arises using a fixed maximum line length with very deeply nested code and data structures
           because eventually the amount of leading whitespace used for indicating indentation takes up most or
           all of the available line width, leaving little or no space for the actual code or data.  One
           solution is to use a vary long line length.  Another solution is to use the -vmll flag, which
           basically tells perltidy to ignore leading whitespace when measuring the line length.

           To be precise, when the -vmll parameter is set, the maximum line length of a line of code will be
           M+L*I, where

                 M is the value of --maximum-line-length=M (-l=M), default 80,
                 I is the value of --indent-columns=I (-i=I), default 4,
                 L is the indentation level of the line of code

           When this flag is set, the choice of breakpoints for a block of code should be essentially
           independent of its nesting depth.  However, the absolute line lengths, including leading whitespace,
           can still be arbitrarily large.  This problem can be avoided by including the next parameter.

           The default is not to do this (-nvmll).

       -wc=n, --whitespace-cycle=n
           This flag also addresses problems with very deeply nested code and data structures.  When the nesting
           depth exceeds the value n the leading whitespace will be reduced and start at a depth of 1 again.
           The result is that blocks of code will shift back to the left rather than moving arbitrarily far to
           the right.  This occurs cyclically to any depth.

           For example if one level of indentation equals 4 spaces (-i=4, the default), and one uses -wc=15,
           then if the leading whitespace on a line exceeds about 4*15=60 spaces it will be reduced back to
           4*1=4 spaces and continue increasing from there.  If the whitespace never exceeds this limit the
           formatting remains unchanged.

           The combination of -vmll and -wc=n provides a solution to the problem of displaying arbitrarily deep
           data structures and code in a finite window, although -wc=n may of course be used without -vmll.

           The default is not to use this, which can also be indicated using -wc=0.

       tabs
           Using tab characters will almost certainly lead to future portability and maintenance problems, so
           the default and recommendation is not to use them.  For those who prefer tabs, however, there are two
           different options.

           Except for possibly introducing tab indentation characters, as outlined below, perltidy does not
           introduce any tab characters into your file, and it removes any tabs from the code (unless requested
           not to do so with -fws).  If you have any tabs in your comments, quotes, or here-documents, they will
           remain.

           -et=n,   --entab-leading-whitespace
               This flag causes each n initial space characters to be replaced by one tab character.  Note that
               the integer n is completely independent of the integer specified for indentation parameter, -i=n.

           -t,   --tabs
               This flag causes one leading tab character to be inserted for each level of indentation.  Certain
               other features are incompatible with this option, and if these options are also given, then a
               warning message will be issued and this flag will be unset.  One example is the -lp option.

           -dt=n,   --default-tabsize=n
               If the first line of code passed to perltidy contains leading tabs but no tab scheme is specified
               for the output stream then perltidy must guess how many spaces correspond to each leading tab.
               This number of spaces n corresponding to each leading tab of the input stream may be specified
               with -dt=n.  The default is n=8.

               This flag has no effect if a tab scheme is specified for the output stream, because then the
               input stream is assumed to use the same tab scheme and indentation spaces as for the output
               stream (any other assumption would lead to unstable editing).

       -syn,   --check-syntax
           This flag causes perltidy to run "perl -c -T" to check syntax of input and output.  (To change the
           flags passed to perl, see the next item, -pscf).  The results are written to the .LOG file, which
           will be saved if an error is detected in the output script.  The output script is not checked if the
           input script has a syntax error.  Perltidy does its own checking, but this option employs perl to get
           a "second opinion".

           If perl reports errors in the input file, they will not be reported in the error output unless the
           --warning-output flag is given.

           The default is NOT to do this type of syntax checking (although perltidy will still do as much self-
           checking as possible).  The reason is that it causes all code in BEGIN blocks to be executed, for all
           modules being used, and this opens the door to security issues and infinite loops when running
           perltidy.

       -pscf=s, -perl-syntax-check-flags=s
           When perl is invoked to check syntax, the normal flags are "-c -T".  In addition, if the -x flag is
           given to perltidy, then perl will also be passed a -x flag.  It should not normally be necessary to
           change these flags, but it can be done with the -pscf=s flag.  For example, if the taint flag, "-T",
           is not wanted, the flag could be set to be just -pscf=-c.

           Perltidy will pass your string to perl with the exception that it will add a -c and -x if
           appropriate.  The .LOG file will show exactly what flags were passed to perl.

       -io,   --indent-only
           This flag is used to deactivate all formatting and line break changes within non-blank lines of code.
           When it is in effect, the only change to the script will be to the indentation and blank lines.  And
           any flags controlling whitespace and newlines will be ignored.  You might want to use this if you are
           perfectly happy with your whitespace and line breaks, and merely want perltidy to handle the
           indentation.  (This also speeds up perltidy by well over a factor of two, so it might be useful when
           perltidy is merely being used to help find a brace error in a large script).

           Setting this flag is equivalent to setting --freeze-newlines and --freeze-whitespace.

           If you also want to keep your existing blank lines exactly as they are, you can add
           --freeze-blank-lines.

       -ole=s,  --output-line-ending=s
           where s="win", "dos", "unix", or "mac".  This flag tells perltidy to output line endings for a
           specific system.  Normally, perltidy writes files with the line separator character of the host
           system.  The "win" and "dos" flags have an identical result.

       -ple,  --preserve-line-endings
           This flag tells perltidy to write its output files with the same line endings as the input file, if
           possible.  It should work for dos, unix, and mac line endings.  It will only work if perltidy input
           comes from a filename (rather than stdin, for example).  If perltidy has trouble determining the
           input file line ending, it will revert to the default behavior of using the line ending of the host
           system.

       -it=n,   --iterations=n
           This flag causes perltidy to do n complete iterations.  The reason for this flag is that code
           beautification is an iterative process and in some cases the output from perltidy can be different if
           it is applied a second time.  For most purposes the default of n=1 should be satisfactory.  However
           n=2 can be useful when a major style change is being made, or when code is being beautified on check-
           in to a source code control system.  It has been found to be extremely rare for the output to change
           after 2 iterations.  If a value n is greater than 2 is input then a convergence test will be used to
           stop the iterations as soon as possible, almost always after 2 iterations.  See the next item for a
           simplified iteration control.

           This flag has no effect when perltidy is used to generate html.

       -conv,   --converge
           This flag is equivalent to -it=4 and is included to simplify iteration control.  For all practical
           purposes one either does or does not want to be sure that the output is converged, and there is no
           penalty to using a large iteration limit since perltidy will check for convergence and stop iterating
           as soon as possible.  The default is -nconv (no convergence check).  Using -conv will approximately
           double run time since normally one extra iteration is required to verify convergence.

   Code Indentation Control
       -ci=n, --continuation-indentation=n
           Continuation indentation is extra indentation spaces applied when a long line is broken.  The default
           is n=2, illustrated here:

            my $level =   # -ci=2
              ( $max_index_to_go >= 0 ) ? $levels_to_go[0] : $last_output_level;

           The same example, with n=0, is a little harder to read:

            my $level =   # -ci=0
            ( $max_index_to_go >= 0 ) ? $levels_to_go[0] : $last_output_level;

           The value given to -ci is also used by some commands when a small space is required.  Examples are
           commands for outdenting labels, -ola, and control keywords, -okw.

           When default values are not used, it is suggested that the value n given with -ci=n be no more than
           about one-half of the number of spaces assigned to a full indentation level on the -i=n command.

       -sil=n --starting-indentation-level=n
           By default, perltidy examines the input file and tries to determine the starting indentation level.
           While it is often zero, it may not be zero for a code snippet being sent from an editing session.

           To guess the starting indentation level perltidy simply assumes that indentation scheme used to
           create the code snippet is the same as is being used for the current perltidy process.  This is the
           only sensible guess that can be made.  It should be correct if this is true, but otherwise it
           probably won't.  For example, if the input script was written with -i=2 and the current peltidy flags
           have -i=4, the wrong initial indentation will be guessed for a code snippet which has non-zero
           initial indentation. Likewise, if an entabbing scheme is used in the input script and not in the
           current process then the guessed indentation will be wrong.

           If the default method does not work correctly, or you want to change the starting level, use -sil=n,
           to force the starting level to be n.

       List indentation using -lp, --line-up-parentheses
           By default, perltidy indents lists with 4 spaces, or whatever value is specified with -i=n.  Here is
           a small list formatted in this way:

               # perltidy (default)
               @month_of_year = (
                   'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
                   'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'
               );

           Use the -lp flag to add extra indentation to cause the data to begin past the opening parentheses of
           a sub call or list, or opening square bracket of an anonymous array, or opening curly brace of an
           anonymous hash.  With this option, the above list would become:

               # perltidy -lp
               @month_of_year = (
                                  'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
                                  'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'
               );

           If the available line length (see -l=n ) does not permit this much space, perltidy will use less.
           For alternate placement of the closing paren, see the next section.

           This option has no effect on code BLOCKS, such as if/then/else blocks, which always use whatever is
           specified with -i=n.  Also, the existence of line breaks and/or block comments between the opening
           and closing parens may cause perltidy to temporarily revert to its default method.

           Note: The -lp option may not be used together with the -t tabs option.  It may, however, be used with
           the -et=n tab method.

           In addition, any parameter which significantly restricts the ability of perltidy to choose newlines
           will conflict with -lp and will cause -lp to be deactivated.  These include -io, -fnl, -nanl, and
           -ndnl.  The reason is that the -lp indentation style can require the careful coordination of an
           arbitrary number of break points in hierarchical lists, and these flags may prevent that.

       -cti=n, --closing-token-indentation
           The -cti=n flag controls the indentation of a line beginning with a ")", "]", or a non-block "}".
           Such a line receives:

            -cti = 0 no extra indentation (default)
            -cti = 1 extra indentation such that the closing token
                   aligns with its opening token.
            -cti = 2 one extra indentation level if the line looks like:
                   );  or  ];  or  };
            -cti = 3 one extra indentation level always

           The flags -cti=1 and -cti=2 work well with the -lp flag (previous section).

               # perltidy -lp -cti=1
               @month_of_year = (
                                  'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
                                  'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'
                                );

               # perltidy -lp -cti=2
               @month_of_year = (
                                  'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
                                  'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'
                                  );

           These flags are merely hints to the formatter and they may not always be followed.  In particular, if
           -lp is not being used, the indentation for cti=1 is constrained to be no more than one indentation
           level.

           If desired, this control can be applied independently to each of the closing container token types.
           In fact, -cti=n is merely an abbreviation for -cpi=n -csbi=n -cbi=n, where: -cpi or
           --closing-paren-indentation controls )'s, -csbi or --closing-square-bracket-indentation controls ]'s,
           -cbi or --closing-brace-indentation controls non-block }'s.

       -icp, --indent-closing-paren
           The -icp flag is equivalent to -cti=2, described in the previous section.  The -nicp flag is
           equivalent -cti=0.  They are included for backwards compatibility.

       -icb, --indent-closing-brace
           The -icb option gives one extra level of indentation to a brace which terminates a code block .  For
           example,

                   if ($task) {
                       yyy();
                       }    # -icb
                   else {
                       zzz();
                       }

           The default is not to do this, indicated by -nicb.

       -olq, --outdent-long-quotes
           When -olq is set, lines which is a quoted string longer than the value maximum-line-length will have
           their indentation removed to make them more readable.  This is the default.  To prevent such out-
           denting, use -nolq or --nooutdent-long-lines.

       -oll, --outdent-long-lines
           This command is equivalent to --outdent-long-quotes and --outdent-long-comments, and it is included
           for compatibility with previous versions of perltidy.  The negation of this also works, -noll or
           --nooutdent-long-lines, and is equivalent to setting -nolq and -nolc.

       Outdenting Labels: -ola,  --outdent-labels
           This command will cause labels to be outdented by 2 spaces (or whatever -ci has been set to), if
           possible.  This is the default.  For example:

                   my $i;
                 LOOP: while ( $i = <FOTOS> ) {
                       chomp($i);
                       next unless $i;
                       fixit($i);
                   }

           Use -nola to not outdent labels.

       Outdenting Keywords
           -okw,  --outdent-keywords
               The command -okw will cause certain leading control keywords to be outdented by 2 spaces (or
               whatever -ci has been set to), if possible.  By default, these keywords are "redo", "next",
               "last", "goto", and "return".  The intention is to make these control keywords easier to see.  To
               change this list of keywords being outdented, see the next section.

               For example, using "perltidy -okw" on the previous example gives:

                       my $i;
                     LOOP: while ( $i = <FOTOS> ) {
                           chomp($i);
                         next unless $i;
                           fixit($i);
                       }

               The default is not to do this.

           Specifying Outdented Keywords: -okwl=string,  --outdent-keyword-list=string
               This command can be used to change the keywords which are outdented with the -okw command.  The
               parameter string is a required list of perl keywords, which should be placed in quotes if there
               are more than one.  By itself, it does not cause any outdenting to occur, so the -okw command is
               still required.

               For example, the commands "-okwl="next last redo goto" -okw" will cause those four keywords to be
               outdented.  It is probably simplest to place any -okwl command in a .perltidyrc file.

   Whitespace Control
       Whitespace refers to the blank space between variables, operators, and other code tokens.

       -fws,  --freeze-whitespace
           This flag causes your original whitespace to remain unchanged, and causes the rest of the whitespace
           commands in this section, the Code Indentation section, and the Comment Control section to be
           ignored.

       Tightness of curly braces, parentheses, and square brackets.
           Here the term "tightness" will mean the closeness with which pairs of enclosing tokens, such as
           parentheses, contain the quantities within.  A numerical value of 0, 1, or 2 defines the tightness,
           with 0 being least tight and 2 being most tight.  Spaces within containers are always symmetric, so
           if there is a space after a "(" then there will be a space before the corresponding ")".

           The -pt=n or --paren-tightness=n parameter controls the space within parens.  The example below shows
           the effect of the three possible values, 0, 1, and 2:

            if ( ( my $len_tab = length( $tabstr ) ) > 0 ) {  # -pt=0
            if ( ( my $len_tab = length($tabstr) ) > 0 ) {    # -pt=1 (default)
            if ((my $len_tab = length($tabstr)) > 0) {        # -pt=2

           When n is 0, there is always a space to the right of a '(' and to the left of a ')'.  For n=2 there
           is never a space.  For n=1, the default, there is a space unless the quantity within the parens is a
           single token, such as an identifier or quoted string.

           Likewise, the parameter -sbt=n or --square-bracket-tightness=n controls the space within square
           brackets, as illustrated below.

            $width = $col[ $j + $k ] - $col[ $j ];  # -sbt=0
            $width = $col[ $j + $k ] - $col[$j];    # -sbt=1 (default)
            $width = $col[$j + $k] - $col[$j];      # -sbt=2

           Curly braces which do not contain code blocks are controlled by the parameter -bt=n or
           --brace-tightness=n.

            $obj->{ $parsed_sql->{ 'table' }[0] };    # -bt=0
            $obj->{ $parsed_sql->{'table'}[0] };      # -bt=1 (default)
            $obj->{$parsed_sql->{'table'}[0]};        # -bt=2

           And finally, curly braces which contain blocks of code are controlled by the parameter -bbt=n or
           --block-brace-tightness=n as illustrated in the example below.

            %bf = map { $_ => -M $_ } grep { /\.deb$/ } dirents '.'; # -bbt=0 (default)
            %bf = map { $_ => -M $_ } grep {/\.deb$/} dirents '.';   # -bbt=1
            %bf = map {$_ => -M $_} grep {/\.deb$/} dirents '.';     # -bbt=2

           To simplify input in the case that all of the tightness flags have the same value <n>, the parameter
           <-act=n> or --all-containers-tightness=n is an abbreviation for the combination <-pt=n -sbt=n -bt=n
           -bbt=n>.

       -tso,   --tight-secret-operators
           The flag -tso causes certain perl token sequences (secret operators) which might be considered to be
           a single operator to be formatted "tightly" (without spaces).  The operators currently modified by
           this flag are:

                0+  +0  ()x!! ~~<>  ,=>   =( )=

           For example the sequence 0 +,  which converts a string to a number, would be formatted without a
           space: 0+ when the -tso flag is set.  This flag is off by default.

       -sts,   --space-terminal-semicolon
           Some programmers prefer a space before all terminal semicolons.  The default is for no such space,
           and is indicated with -nsts or --nospace-terminal-semicolon.

                   $i = 1 ;     #  -sts
                   $i = 1;      #  -nsts   (default)

       -sfs,   --space-for-semicolon
           Semicolons within for loops may sometimes be hard to see, particularly when commas are also present.
           This option places spaces on both sides of these special semicolons, and is the default.  Use -nsfs
           or --nospace-for-semicolon to deactivate it.

            for ( @a = @$ap, $u = shift @a ; @a ; $u = $v ) {  # -sfs (default)
            for ( @a = @$ap, $u = shift @a; @a; $u = $v ) {    # -nsfs

       -asc,  --add-semicolons
           Setting -asc allows perltidy to add any missing optional semicolon at the end of a line which is
           followed by a closing curly brace on the next line.  This is the default, and may be deactivated with
           -nasc or --noadd-semicolons.

       -dsm,  --delete-semicolons
           Setting -dsm allows perltidy to delete extra semicolons which are simply empty statements.  This is
           the default, and may be deactivated with -ndsm or --nodelete-semicolons.  (Such semicolons are not
           deleted, however, if they would promote a side comment to a block comment).

       -aws,  --add-whitespace
           Setting this option allows perltidy to add certain whitespace improve code readability.  This is the
           default. If you do not want any whitespace added, but are willing to have some whitespace deleted,
           use -naws.  (Use -fws to leave whitespace completely unchanged).

       -dws,  --delete-old-whitespace
           Setting this option allows perltidy to remove some old whitespace between characters, if necessary.
           This is the default.  If you do not want any old whitespace removed, use -ndws or
           --nodelete-old-whitespace.

       Detailed whitespace controls around tokens
           For those who want more detailed control over the whitespace around tokens, there are four parameters
           which can directly modify the default whitespace rules built into perltidy for any token.  They are:

           -wls=s or --want-left-space=s,

           -nwls=s or --nowant-left-space=s,

           -wrs=s or --want-right-space=s,

           -nwrs=s or --nowant-right-space=s.

           These parameters are each followed by a quoted string, s, containing a list of token types.  No more
           than one of each of these parameters should be specified, because repeating a command-line parameter
           always overwrites the previous one before perltidy ever sees it.

           To illustrate how these are used, suppose it is desired that there be no space on either side of the
           token types = + - / *.  The following two parameters would specify this desire:

             -nwls="= + - / *"    -nwrs="= + - / *"

           (Note that the token types are in quotes, and that they are separated by spaces).  With these
           modified whitespace rules, the following line of math:

             $root = -$b + sqrt( $b * $b - 4. * $a * $c ) / ( 2. * $a );

           becomes this:

             $root=-$b+sqrt( $b*$b-4.*$a*$c )/( 2.*$a );

           These parameters should be considered to be hints to perltidy rather than fixed rules, because
           perltidy must try to resolve conflicts that arise between them and all of the other rules that it
           uses.  One conflict that can arise is if, between two tokens, the left token wants a space and the
           right one doesn't.  In this case, the token not wanting a space takes priority.

           It is necessary to have a list of all token types in order to create this type of input.  Such a list
           can be obtained by the command --dump-token-types.  Also try the -D flag on a short snippet of code
           and look at the .DEBUG file to see the tokenization.

           WARNING Be sure to put these tokens in quotes to avoid having them misinterpreted by your command
           shell.

       Space between specific keywords and opening paren
           When an opening paren follows a Perl keyword, no space is introduced after the keyword, unless it is
           (by default) one of these:

              my local our and or eq ne if else elsif until unless
              while for foreach return switch case given when

           These defaults can be modified with two commands:

           -sak=s  or --space-after-keyword=s  adds keywords.

           -nsak=s  or --nospace-after-keyword=s  removes keywords.

           where s is a list of keywords (in quotes if necessary).  For example,

             my ( $a, $b, $c ) = @_;    # default
             my( $a, $b, $c ) = @_;     # -nsak="my local our"

           The abbreviation -nsak='*' is equivalent to including all of the keywords in the above list.

           When both -nsak=s and -sak=s commands are included, the -nsak=s command is executed first.  For
           example, to have space after only the keywords (my, local, our) you could use -nsak="*" -sak="my
           local our".

           To put a space after all keywords, see the next item.

       Space between all keywords and opening parens
           When an opening paren follows a function or keyword, no space is introduced after the keyword except
           for the keywords noted in the previous item.  To always put a space between a function or keyword and
           its opening paren, use the command:

           -skp  or --space-keyword-paren

           You will probably also want to use the flag -sfp (next item) too.

       Space between all function names and opening parens
           When an opening paren follows a function the default is not to introduce a space.  To cause a space
           to be introduced use:

           -sfp  or --space-function-paren

             myfunc( $a, $b, $c );    # default
             myfunc ( $a, $b, $c );   # -sfp

           You will probably also want to use the flag -skp (previous item) too.

       Trimming whitespace around "qw" quotes
           -tqw or --trim-qw provide the default behavior of trimming spaces around multi-line "qw" quotes and
           indenting them appropriately.

           -ntqw or --notrim-qw cause leading and trailing whitespace around multi-line "qw" quotes to be left
           unchanged.  This option will not normally be necessary, but was added for testing purposes, because
           in some versions of perl, trimming "qw" quotes changes the syntax tree.

       Trimming trailing whitespace from lines of POD
           -trp or --trim-pod will remove trailing whitespace from lines of POD.  The default is not to do this.

   Comment Controls
       Perltidy has a number of ways to control the appearance of both block comments and side comments.  The
       term block comment here refers to a full-line comment, whereas side comment will refer to a comment which
       appears on a line to the right of some code.

       -ibc,  --indent-block-comments
           Block comments normally look best when they are indented to the same level as the code which follows
           them.  This is the default behavior, but you may use -nibc to keep block comments left-justified.
           Here is an example:

                        # this comment is indented      (-ibc, default)
                        if ($task) { yyy(); }

           The alternative is -nibc:

            # this comment is not indented              (-nibc)
                        if ($task) { yyy(); }

           See also the next item, -isbc, as well as -sbc, for other ways to have some indented and some
           outdented block comments.

       -isbc,  --indent-spaced-block-comments
           If there is no leading space on the line, then the comment will not be indented, and otherwise it may
           be.

           If both -ibc and -isbc are set, then -isbc takes priority.

       -olc, --outdent-long-comments
           When -olc is set, lines which are full-line (block) comments longer than the value maximum-line-
           length will have their indentation removed.  This is the default; use -nolc to prevent outdenting.

       -msc=n,  --minimum-space-to-comment=n
           Side comments look best when lined up several spaces to the right of code.  Perltidy will try to keep
           comments at least n spaces to the right.  The default is n=4 spaces.

       -fpsc=n,  --fixed-position-side-comment=n
           This parameter tells perltidy to line up side comments in column number n whenever possible.  The
           default, n=0, will not do this.

       -iscl,  --ignore-side-comment-lengths
           This parameter causes perltidy to ignore the length of side comments when setting line breaks.  The
           default, -niscl, is to include the length of side comments when breaking lines to stay within the
           length prescribed by the -l=n maximum line length parameter.  For example, the following long single
           line would remain intact with -l=80 and -iscl:

                perltidy -l=80 -iscl
                   $vmsfile =~ s/;[\d\-]*$//; # Clip off version number; we can use a newer version as well

           whereas without the -iscl flag the line will be broken:

                perltidy -l=80
                   $vmsfile =~ s/;[\d\-]*$//
                     ;    # Clip off version number; we can use a newer version as well

       -hsc, --hanging-side-comments
           By default, perltidy tries to identify and align "hanging side comments", which are something like
           this:

                   my $IGNORE = 0;    # This is a side comment
                                      # This is a hanging side comment
                                      # And so is this

           A comment is considered to be a hanging side comment if (1) it immediately follows a line with a side
           comment, or another hanging side comment, and (2) there is some leading whitespace on the line.  To
           deactivate this feature, use -nhsc or --nohanging-side-comments.  If block comments are preceded by a
           blank line, or have no leading whitespace, they will not be mistaken as hanging side comments.

       Closing Side Comments
           A closing side comment is a special comment which perltidy can automatically create and place after
           the closing brace of a code block.  They can be useful for code maintenance and debugging.  The
           command -csc (or --closing-side-comments) adds or updates closing side comments.  For example, here
           is a small code snippet

                   sub message {
                       if ( !defined( $_[0] ) ) {
                           print("Hello, World\n");
                       }
                       else {
                           print( $_[0], "\n" );
                       }
                   }

           And here is the result of processing with "perltidy -csc":

                   sub message {
                       if ( !defined( $_[0] ) ) {
                           print("Hello, World\n");
                       }
                       else {
                           print( $_[0], "\n" );
                       }
                   } ## end sub message

           A closing side comment was added for "sub message" in this case, but not for the "if" and "else"
           blocks, because they were below the 6 line cutoff limit for adding closing side comments.  This limit
           may be changed with the -csci command, described below.

           The command -dcsc (or --delete-closing-side-comments) reverses this process and removes these
           comments.

           Several commands are available to modify the behavior of these two basic commands, -csc and -dcsc:

           -csci=n, or --closing-side-comment-interval=n
               where "n" is the minimum number of lines that a block must have in order for a closing side
               comment to be added.  The default value is "n=6".  To illustrate:

                       # perltidy -csci=2 -csc
                       sub message {
                           if ( !defined( $_[0] ) ) {
                               print("Hello, World\n");
                           } ## end if ( !defined( $_[0] ))
                           else {
                               print( $_[0], "\n" );
                           } ## end else [ if ( !defined( $_[0] ))
                       } ## end sub message

               Now the "if" and "else" blocks are commented.  However, now this has become very cluttered.

           -cscp=string, or --closing-side-comment-prefix=string
               where string is the prefix used before the name of the block type.  The default prefix, shown
               above, is "## end".  This string will be added to closing side comments, and it will also be used
               to recognize them in order to update, delete, and format them.  Any comment identified as a
               closing side comment will be placed just a single space to the right of its closing brace.

           -cscl=string, or --closing-side-comment-list-string
               where "string" is a list of block types to be tagged with closing side comments.  By default, all
               code block types preceded by a keyword or label (such as "if", "sub", and so on) will be tagged.
               The -cscl command changes the default list to be any selected block types; see "Specifying Block
               Types".  For example, the following command requests that only "sub"'s, labels, "BEGIN", and
               "END" blocks be affected by any -csc or -dcsc operation:

                  -cscl="sub : BEGIN END"

           -csct=n, or --closing-side-comment-maximum-text=n
               The text appended to certain block types, such as an "if" block, is whatever lies between the
               keyword introducing the block, such as "if", and the opening brace.  Since this might be too much
               text for a side comment, there needs to be a limit, and that is the purpose of this parameter.
               The default value is "n=20", meaning that no additional tokens will be appended to this text
               after its length reaches 20 characters.  Omitted text is indicated with "...".  (Tokens,
               including sub names, are never truncated, however, so actual lengths may exceed this).  To
               illustrate, in the above example, the appended text of the first block is " ( !defined( $_[0]
               )...".  The existing limit of "n=20" caused this text to be truncated, as indicated by the "...".
               See the next flag for additional control of the abbreviated text.

           -cscb, or --closing-side-comments-balanced
               As discussed in the previous item, when the closing-side-comment-maximum-text limit is exceeded
               the comment text must be truncated.  Older versions of perltidy terminated with three dots, and
               this can still be achieved with -ncscb:

                 perltidy -csc -ncscb
                 } ## end foreach my $foo (sort { $b cmp $a ...

               However this causes a problem with editors which cannot recognize comments or are not configured
               to do so because they cannot "bounce" around in the text correctly.  The -cscb flag has been
               added to help them by appending appropriate balancing structure:

                 perltidy -csc -cscb
                 } ## end foreach my $foo (sort { $b cmp $a ... })

               The default is -cscb.

           -csce=n, or --closing-side-comment-else-flag=n
               The default, n=0, places the text of the opening "if" statement after any terminal "else".

               If n=2 is used, then each "elsif" is also given the text of the opening "if" statement.  Also, an
               "else" will include the text of a preceding "elsif" statement.  Note that this may result some
               long closing side comments.

               If n=1 is used, the results will be the same as n=2 whenever the resulting line length is less
               than the maximum allowed.  =item -cscb, or --closing-side-comments-balanced

               When using closing-side-comments, and the closing-side-comment-maximum-text limit is exceeded,
               then the comment text must be abbreviated.  It is terminated with three dots if the -cscb flag is
               negated:

                 perltidy -csc -ncscb
                 } ## end foreach my $foo (sort { $b cmp $a ...

               This causes a problem with older editors which do not recognize comments because they cannot
               "bounce" around in the text correctly.  The -cscb flag tries to help them by appending
               appropriate terminal balancing structures:

                 perltidy -csc -cscb
                 } ## end foreach my $foo (sort { $b cmp $a ... })

               The default is -cscb.

           -cscw, or --closing-side-comment-warnings
               This parameter is intended to help make the initial transition to the use of closing side
               comments.  It causes two things to happen if a closing side comment replaces an existing,
               different closing side comment:  first, an error message will be issued, and second, the original
               side comment will be placed alone on a new specially marked comment line for later attention.

               The intent is to avoid clobbering existing hand-written side comments which happen to match the
               pattern of closing side comments. This flag should only be needed on the first run with -csc.

           Important Notes on Closing Side Comments:

           •   Closing side comments are only placed on lines terminated with a closing brace.  Certain closing
               styles, such as the use of cuddled elses (-ce), preclude the generation of some closing side
               comments.

           •   Please note that adding or deleting of closing side comments takes place only through the
               commands -csc or -dcsc.  The other commands, if used, merely modify the behavior of these two
               commands.

           •   It is recommended that the -cscw flag be used along with -csc on the first use of perltidy on a
               given file.  This will prevent loss of any existing side comment data which happens to have the
               csc prefix.

           •   Once you use -csc, you should continue to use it so that any closing side comments remain correct
               as code changes.  Otherwise, these comments will become incorrect as the code is updated.

           •   If you edit the closing side comments generated by perltidy, you must also change the prefix to
               be different from the closing side comment prefix.  Otherwise, your edits will be lost when you
               rerun perltidy with -csc.   For example, you could simply change "## end" to be "## End", since
               the test is case sensitive.  You may also want to use the -ssc flag to keep these modified
               closing side comments spaced the same as actual closing side comments.

           •   Temporarily generating closing side comments is a useful technique for exploring and/or debugging
               a perl script, especially one written by someone else.  You can always remove them with -dcsc.

       Static Block Comments
           Static block comments are block comments with a special leading pattern, "##" by default, which will
           be treated slightly differently from other block comments.  They effectively behave as if they had
           glue along their left and top edges, because they stick to the left edge and previous line when there
           is no blank spaces in those places.  This option is particularly useful for controlling how commented
           code is displayed.

           -sbc, --static-block-comments
               When -sbc is used, a block comment with a special leading pattern, "##" by default, will be
               treated specially.

               Comments so identified  are treated as follows:

               •   If there is no leading space on the line, then the comment will not be indented, and
                   otherwise it may be,

               •   no new blank line will be inserted before such a comment, and

               •   such a comment will never become a hanging side comment.

               For example, assuming @month_of_year is left-adjusted:

                   @month_of_year = (    # -sbc (default)
                       'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct',
                   ##  'Dec', 'Nov'
                       'Nov', 'Dec');

               Without this convention, the above code would become

                   @month_of_year = (   # -nsbc
                       'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct',

                       ##  'Dec', 'Nov'
                       'Nov', 'Dec'
                   );

               which is not as clear.  The default is to use -sbc.  This may be deactivated with -nsbc.

           -sbcp=string, --static-block-comment-prefix=string
               This parameter defines the prefix used to identify static block comments when the -sbc parameter
               is set.  The default prefix is "##", corresponding to "-sbcp=##".  The prefix is actually part of
               a perl pattern used to match lines and it must either begin with "#" or "^#".  In the first case
               a prefix ^\s* will be added to match any leading whitespace, while in the second case the pattern
               will match only comments with no leading whitespace.  For example, to identify all comments as
               static block comments, one would use "-sbcp=#".  To identify all left-adjusted comments as static
               block comments, use "-sbcp='^#'".

               Please note that -sbcp merely defines the pattern used to identify static block comments; it will
               not be used unless the switch -sbc is set.  Also, please be aware that since this string is used
               in a perl regular expression which identifies these comments, it must enable a valid regular
               expression to be formed.

               A pattern which can be useful is:

                   -sbcp=^#{2,}[^\s#]

               This pattern requires a static block comment to have at least one character which is neither a #
               nor a space.  It allows a line containing only '#' characters to be rejected as a static block
               comment.  Such lines are often used at the start and end of header information in subroutines and
               should not be separated from the intervening comments, which typically begin with just a single
               '#'.

           -osbc, --outdent-static-block-comments
               The command -osbc will cause static block comments to be outdented by 2 spaces (or whatever -ci=n
               has been set to), if possible.

       Static Side Comments
           Static side comments are side comments with a special leading pattern.  This option can be useful for
           controlling how commented code is displayed when it is a side comment.

           -ssc, --static-side-comments
               When -ssc is used, a side comment with a static leading pattern, which is "##" by default, will
               be spaced only a single space from previous character, and it will not be vertically aligned with
               other side comments.

               The default is -nssc.

           -sscp=string, --static-side-comment-prefix=string
               This parameter defines the prefix used to identify static side comments when the -ssc parameter
               is set.  The default prefix is "##", corresponding to "-sscp=##".

               Please note that -sscp merely defines the pattern used to identify static side comments; it will
               not be used unless the switch -ssc is set.  Also, note that this string is used in a perl regular
               expression which identifies these comments, so it must enable a valid regular expression to be
               formed.

   Skipping Selected Sections of Code
       Selected lines of code may be passed verbatim to the output without any formatting.  This feature is
       enabled by default but can be disabled with the --noformat-skipping or -nfs flag.  It should be used
       sparingly to avoid littering code with markers, but it might be helpful for working around occasional
       problems.  For example it might be useful for keeping the indentation of old commented code unchanged,
       keeping indentation of long blocks of aligned comments unchanged, keeping certain list formatting
       unchanged, or working around a glitch in perltidy.

       -fs,  --format-skipping
           This flag, which is enabled by default, causes any code between special beginning and ending comment
           markers to be passed to the output without formatting.  The default beginning marker is #<<< and the
           default ending marker is #>>> but they may be changed (see next items below).  Additional text may
           appear on these special comment lines provided that it is separated from the marker by at least one
           space.  For example

            #<<<  do not let perltidy touch this
               my @list = (1,
                           1, 1,
                           1, 2, 1,
                           1, 3, 3, 1,
                           1, 4, 6, 4, 1,);
            #>>>

           The comment markers may be placed at any location that a block comment may appear.  If they do not
           appear to be working, use the -log flag and examine the .LOG file.  Use -nfs to disable this feature.

       -fsb=string,  --format-skipping-begin=string
           The -fsb=string parameter may be used to change the beginning marker for format skipping.  The
           default is equivalent to -fsb='#<<<'.  The string that you enter must begin with a # and should be in
           quotes as necessary to get past the command shell of your system.  It is actually the leading text of
           a pattern that is constructed by appending a '\s', so you must also include backslashes for
           characters to be taken literally rather than as patterns.

           Some examples show how example strings become patterns:

            -fsb='#\{\{\{' becomes /^#\{\{\{\s/  which matches  #{{{ but not #{{{{
            -fsb='#\*\*'   becomes /^#\*\*\s/    which matches  #** but not #***
            -fsb='#\*{2,}' becomes /^#\*{2,}\s/  which matches  #** and #*****

       -fse=string,  --format-skipping-end=string
           The -fsb=string is the corresponding parameter used to change the ending marker for format skipping.
           The default is equivalent to -fse='#<<<'.

   Line Break Control
       The parameters in this section control breaks after non-blank lines of code.  Blank lines are controlled
       separately by parameters in the section "Blank Line Control".

       -fnl,  --freeze-newlines
           If you do not want any changes to the line breaks within lines of code in your script, set -fnl, and
           they will remain fixed, and the rest of the commands in this section and sections "Controlling List
           Formatting", "Retaining or Ignoring Existing Line Breaks".  You may want to use -noll with this.

           Note: If you also want to keep your blank lines exactly as they are, you can use the -fbl flag which
           is described in the section "Blank Line Control".

       -ce,   --cuddled-else
           Enable the "cuddled else" style, in which "else" and "elsif" are follow immediately after the curly
           brace closing the previous block.  The default is not to use cuddled elses, and is indicated with the
           flag -nce or --nocuddled-else.  Here is a comparison of the alternatives:

             if ($task) {
                 yyy();
             } else {    # -ce
                 zzz();
             }

             if ($task) {
                   yyy();
             }
             else {    # -nce  (default)
                   zzz();
             }

       -bl,    --opening-brace-on-new-line
           Use the flag -bl to place the opening brace on a new line:

             if ( $input_file eq '-' )    # -bl
             {
                 important_function();
             }

           This flag applies to all structural blocks, including named sub's (unless the -sbl flag is set -- see
           next item).

           The default style, -nbl, places an opening brace on the same line as the keyword introducing it.  For
           example,

             if ( $input_file eq '-' ) {   # -nbl (default)

       -sbl,    --opening-sub-brace-on-new-line
           The flag -sbl can be used to override the value of -bl for the opening braces of named sub's.  For
           example,

            perltidy -sbl

           produces this result:

            sub message
            {
               if (!defined($_[0])) {
                   print("Hello, World\n");
               }
               else {
                   print($_[0], "\n");
               }
            }

           This flag is negated with -nsbl.  If -sbl is not specified, the value of -bl is used.

       -asbl,    --opening-anonymous-sub-brace-on-new-line
           The flag -asbl is like the -sbl flag except that it applies to anonymous sub's instead of named subs.
           For example

            perltidy -asbl

           produces this result:

            $a = sub
            {
                if ( !defined( $_[0] ) ) {
                    print("Hello, World\n");
                }
                else {
                    print( $_[0], "\n" );
                }
            };

           This flag is negated with -nasbl, and the default is -nasbl.

       -bli,    --brace-left-and-indent
           The flag -bli is the same as -bl but in addition it causes one unit of continuation indentation ( see
           -ci ) to be placed before an opening and closing block braces.

           For example,

                   if ( $input_file eq '-' )    # -bli
                     {
                       important_function();
                     }

           By default, this extra indentation occurs for blocks of type: if, elsif, else, unless, for, foreach,
           sub, while, until, and also with a preceding label.  The next item shows how to change this.

       -blil=s,    --brace-left-and-indent-list=s
           Use this parameter to change the types of block braces for which the -bli flag applies; see
           "Specifying Block Types".  For example, -blil='if elsif else' would apply it to only "if/elsif/else"
           blocks.

       -bar,    --opening-brace-always-on-right
           The default style, -nbl places the opening code block brace on a new line if it does not fit on the
           same line as the opening keyword, like this:

                   if ( $bigwasteofspace1 && $bigwasteofspace2
                     || $bigwasteofspace3 && $bigwasteofspace4 )
                   {
                       big_waste_of_time();
                   }

           To force the opening brace to always be on the right, use the -bar flag.  In this case, the above
           example becomes

                   if ( $bigwasteofspace1 && $bigwasteofspace2
                     || $bigwasteofspace3 && $bigwasteofspace4 ) {
                       big_waste_of_time();
                   }

           A conflict occurs if both -bl and -bar are specified.

       -otr,  --opening-token-right and related flags
           The -otr flag is a hint that perltidy should not place a break between a comma and an opening token.
           For example:

               # default formatting
               push @{ $self->{$module}{$key} },
                 {
                   accno       => $ref->{accno},
                   description => $ref->{description}
                 };

               # perltidy -otr
               push @{ $self->{$module}{$key} }, {
                   accno       => $ref->{accno},
                   description => $ref->{description}
                 };

           The flag -otr is actually an abbreviation for three other flags which can be used to control parens,
           hash braces, and square brackets separately if desired:

             -opr  or --opening-paren-right
             -ohbr or --opening-hash-brace-right
             -osbr or --opening-square-bracket-right

       Vertical tightness of non-block curly braces, parentheses, and square brackets.
           These parameters control what shall be called vertical tightness.  Here are the main points:

           •   Opening tokens (except for block braces) are controlled by -vt=n, or --vertical-tightness=n,
               where

                -vt=0 always break a line after opening token (default).
                -vt=1 do not break unless this would produce more than one
                        step in indentation in a line.
                -vt=2 never break a line after opening token

           •   You must also use the -lp flag when you use the -vt flag; the reason is explained below.

           •   Closing tokens (except for block braces) are controlled by -vtc=n, or
               --vertical-tightness-closing=n, where

                -vtc=0 always break a line before a closing token (default),
                -vtc=1 do not break before a closing token which is followed
                       by a semicolon or another closing token, and is not in
                       a list environment.
                -vtc=2 never break before a closing token.

               The rules for -vtc=1 are designed to maintain a reasonable balance between tightness and
               readability in complex lists.

           •   Different controls may be applied to different token types, and it is also possible to control
               block braces; see below.

           •   Finally, please note that these vertical tightness flags are merely hints to the formatter, and
               it cannot always follow them.  Things which make it difficult or impossible include comments,
               blank lines, blocks of code within a list, and possibly the lack of the -lp parameter.  Also,
               these flags may be ignored for very small lists (2 or 3 lines in length).

           Here are some examples:

               # perltidy -lp -vt=0 -vtc=0
               %romanNumerals = (
                                  one   => 'I',
                                  two   => 'II',
                                  three => 'III',
                                  four  => 'IV',
               );

               # perltidy -lp -vt=1 -vtc=0
               %romanNumerals = ( one   => 'I',
                                  two   => 'II',
                                  three => 'III',
                                  four  => 'IV',
               );

               # perltidy -lp -vt=1 -vtc=1
               %romanNumerals = ( one   => 'I',
                                  two   => 'II',
                                  three => 'III',
                                  four  => 'IV', );

           The difference between -vt=1 and -vt=2 is shown here:

               # perltidy -lp -vt=1
               $init->add(
                           mysprintf( "(void)find_threadsv(%s);",
                                      cstring( $threadsv_names[ $op->targ ] )
                           )
               );

               # perltidy -lp -vt=2
               $init->add( mysprintf( "(void)find_threadsv(%s);",
                                      cstring( $threadsv_names[ $op->targ ] )
                           )
               );

           With -vt=1, the line ending in "add(" does not combine with the next line because the next line is
           not balanced.  This can help with readability, but -vt=2 can be used to ignore this rule.

           The tightest, and least readable, code is produced with both "-vt=2" and "-vtc=2":

               # perltidy -lp -vt=2 -vtc=2
               $init->add( mysprintf( "(void)find_threadsv(%s);",
                                      cstring( $threadsv_names[ $op->targ ] ) ) );

           Notice how the code in all of these examples collapses vertically as -vt increases, but the
           indentation remains unchanged.  This is because perltidy implements the -vt parameter by first
           formatting as if -vt=0, and then simply overwriting one output line on top of the next, if possible,
           to achieve the desired vertical tightness.  The -lp indentation style has been designed to allow this
           vertical collapse to occur, which is why it is required for the -vt parameter.

           The -vt=n and -vtc=n parameters apply to each type of container token.  If desired, vertical
           tightness controls can be applied independently to each of the closing container token types.

           The parameters for controlling parentheses are -pvt=n or --paren-vertical-tightness=n, and -pcvt=n or
           --paren-vertical-tightness-closing=n.

           Likewise, the parameters for square brackets are -sbvt=n or --square-bracket-vertical-tightness=n,
           and -sbcvt=n or --square-bracket-vertical-tightness-closing=n.

           Finally, the parameters for controlling non-code block braces are -bvt=n or
           --brace-vertical-tightness=n, and -bcvt=n or --brace-vertical-tightness-closing=n.

           In fact, the parameter -vt=n is actually just an abbreviation for -pvt=n -bvt=n sbvt=n, and likewise
           -vtc=n is an abbreviation for -pvtc=n -bvtc=n sbvtc=n.

       -bbvt=n or --block-brace-vertical-tightness=n
           The -bbvt=n flag is just like the -vt=n flag but applies to opening code block braces.

            -bbvt=0 break after opening block brace (default).
            -bbvt=1 do not break unless this would produce more than one
                    step in indentation in a line.
            -bbvt=2 do not break after opening block brace.

           It is necessary to also use either -bl or -bli for this to work, because, as with other vertical
           tightness controls, it is implemented by simply overwriting a line ending with an opening block brace
           with the subsequent line.  For example:

               # perltidy -bli -bbvt=0
               if ( open( FILE, "< $File" ) )
                 {
                   while ( $File = <FILE> )
                     {
                       $In .= $File;
                       $count++;
                     }
                   close(FILE);
                 }

               # perltidy -bli -bbvt=1
               if ( open( FILE, "< $File" ) )
                 { while ( $File = <FILE> )
                     { $In .= $File;
                       $count++;
                     }
                   close(FILE);
                 }

           By default this applies to blocks associated with keywords if, elsif, else, unless, for, foreach,
           sub, while, until, and also with a preceding label.  This can be changed with the parameter
           -bbvtl=string, or --block-brace-vertical-tightness-list=string, where string is a space-separated
           list of block types.  For more information on the possible values of this string, see "Specifying
           Block Types"

           For example, if we want to just apply this style to "if", "elsif", and "else" blocks, we could use
           "perltidy -bli -bbvt=1 -bbvtl='if elsif else'".

           There is no vertical tightness control for closing block braces; with one exception they will be
           placed on separate lines.  The exception is that a cascade of closing block braces may be stacked on
           a single line.  See -scbb.

       -sot,  --stack-opening-tokens and related flags
           The -sot flag tells perltidy to "stack" opening tokens when possible to avoid lines with isolated
           opening tokens.

           For example:

               # default
               $opt_c = Text::CSV_XS->new(
                   {
                       binary       => 1,
                       sep_char     => $opt_c,
                       always_quote => 1,
                   }
               );

               # -sot
               $opt_c = Text::CSV_XS->new( {
                       binary       => 1,
                       sep_char     => $opt_c,
                       always_quote => 1,
                   }
               );

           For detailed control of individual closing tokens the following controls can be used:

             -sop  or --stack-opening-paren
             -sohb or --stack-opening-hash-brace
             -sosb or --stack-opening-square-bracket
             -sobb or --stack-opening-block-brace

           The flag -sot is an abbreviation for -sop -sohb -sosb.

           The flag -sobb is a abbreviation for -bbvt=2 -bbvtl='*'.  This will case a cascade of opening block
           braces to appear on a single line, although this an uncommon occurrence except in test scripts.

       -sct,  --stack-closing-tokens and related flags
           The -sct flag tells perltidy to "stack" closing tokens when possible to avoid lines with isolated
           closing tokens.

           For example:

               # default
               $opt_c = Text::CSV_XS->new(
                   {
                       binary       => 1,
                       sep_char     => $opt_c,
                       always_quote => 1,
                   }
               );

               # -sct
               $opt_c = Text::CSV_XS->new(
                   {
                       binary       => 1,
                       sep_char     => $opt_c,
                       always_quote => 1,
                   } );

           The -sct flag is somewhat similar to the -vtc flags, and in some cases it can give a similar result.
           The difference is that the -vtc flags try to avoid lines with leading opening tokens by "hiding" them
           at the end of a previous line, whereas the -sct flag merely tries to reduce the number of lines with
           isolated closing tokens by stacking them but does not try to hide them.  For example:

               # -vtc=2
               $opt_c = Text::CSV_XS->new(
                   {
                       binary       => 1,
                       sep_char     => $opt_c,
                       always_quote => 1, } );

           For detailed control of the stacking of individual closing tokens the following controls can be used:

             -scp  or --stack-closing-paren
             -schb or --stack-closing-hash-brace
             -scsb or --stack-closing-square-bracket
             -scbb or --stack-closing-block-brace

           The flag -sct is an abbreviation for stacking the non-block closing tokens, -scp -schb -scsb.

           Stacking of closing block braces, -scbb, causes a cascade of isolated closing block braces to be
           combined into a single line as in the following example:

               # -scbb:
               for $w1 (@w1) {
                   for $w2 (@w2) {
                       for $w3 (@w3) {
                           for $w4 (@w4) {
                               push( @lines, "$w1 $w2 $w3 $w4\n" );
                           } } } }

           To simplify input even further for the case in which both opening and closing non-block containers
           are stacked, the flag -sac or --stack-all-containers is an abbreviation for -sot -sot.

       -dnl,  --delete-old-newlines
           By default, perltidy first deletes all old line break locations, and then it looks for good break
           points to match the desired line length.  Use -ndnl or  --nodelete-old-newlines to force perltidy to
           retain all old line break points.

       -anl,  --add-newlines
           By default, perltidy will add line breaks when necessary to create continuations of long lines and to
           improve the script appearance.  Use -nanl or --noadd-newlines to prevent any new line breaks.

           This flag does not prevent perltidy from eliminating existing line breaks; see --freeze-newlines to
           completely prevent changes to line break points.

       Controlling whether perltidy breaks before or after operators
           Four command line parameters provide some control over whether a line break should be before or after
           specific token types.  Two parameters give detailed control:

           -wba=s or --want-break-after=s, and

           -wbb=s or --want-break-before=s.

           These parameters are each followed by a quoted string, s, containing a list of token types (separated
           only by spaces).  No more than one of each of these parameters should be specified, because repeating
           a command-line parameter always overwrites the previous one before perltidy ever sees it.

           By default, perltidy breaks after these token types:
             % + - * / x != == >= <= =~ !~ < >  | &
             = **= += *= &= <<= &&= -= /= |= >>= ||= //= .= %= ^= x=

           And perltidy breaks before these token types by default:
             . << >> -> && || //

           To illustrate, to cause a break after a concatenation operator, '.', rather than before it, the
           command line would be

             -wba="."

           As another example, the following command would cause a break before math operators '+', '-', '/',
           and '*':

             -wbb="+ - / *"

           These commands should work well for most of the token types that perltidy uses (use
           --dump-token-types for a list).  Also try the -D flag on a short snippet of code and look at the
           .DEBUG file to see the tokenization.  However, for a few token types there may be conflicts with
           hardwired logic which cause unexpected results.  One example is curly braces, which should be
           controlled with the parameter bl provided for that purpose.

           WARNING Be sure to put these tokens in quotes to avoid having them misinterpreted by your command
           shell.

           Two additional parameters are available which, though they provide no further capability, can
           simplify input are:

           -baao or --break-after-all-operators,

           -bbao or --break-before-all-operators.

           The -baao sets the default to be to break after all of the following operators:

               % + - * / x != == >= <= =~ !~ < > | &
               = **= += *= &= <<= &&= -= /= |= >>= ||= //= .= %= ^= x=
               . : ? && || and or err xor

           and the -bbao flag sets the default to break before all of these operators.  These can be used to
           define an initial break preference which can be fine-tuned with the -wba and -wbb flags.  For
           example, to break before all operators except an = one could use --bbao -wba='=' rather than listing
           every single perl operator except = on a -wbb flag.

   Controlling List Formatting
       Perltidy attempts to place comma-separated arrays of values in tables which look good.  Its default
       algorithms usually work well, and they have been improving with each release, but several parameters are
       available to control list formatting.

       -boc,  --break-at-old-comma-breakpoints
           This flag tells perltidy to try to break at all old commas.  This is not the default.  Normally,
           perltidy makes a best guess at list formatting, and seldom uses old comma breakpoints.  Usually this
           works well, but consider:

               my @list = (1,
                           1, 1,
                           1, 2, 1,
                           1, 3, 3, 1,
                           1, 4, 6, 4, 1,);

           The default formatting will flatten this down to one line:

               # perltidy (default)
               my @list = ( 1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 6, 4, 1, );

           which hides the structure. Using -boc, plus additional flags to retain the original style, yields

               # perltidy -boc -lp -pt=2 -vt=1 -vtc=1
               my @list = (1,
                           1, 1,
                           1, 2, 1,
                           1, 3, 3, 1,
                           1, 4, 6, 4, 1,);

           A disadvantage of this flag is that all tables in the file must already be nicely formatted.  For
           another possibility see the -fs flag in "Skipping Selected Sections of Code".

       -mft=n,  --maximum-fields-per-table=n
           If the computed number of fields for any table exceeds n, then it will be reduced to n.  The default
           value for n is a large number, 40.  While this value should probably be left unchanged as a general
           rule, it might be used on a small section of code to force a list to have a particular number of
           fields per line, and then either the -boc flag could be used to retain this formatting, or a single
           comment could be introduced somewhere to freeze the formatting in future applications of perltidy.

               # perltidy -mft=2
               @month_of_year = (
                   'Jan', 'Feb',
                   'Mar', 'Apr',
                   'May', 'Jun',
                   'Jul', 'Aug',
                   'Sep', 'Oct',
                   'Nov', 'Dec'
               );

       -cab=n,  --comma-arrow-breakpoints=n
           A comma which follows a comma arrow, '=>', is given special consideration.  In a long list, it is
           common to break at all such commas.  This parameter can be used to control how perltidy breaks at
           these commas.  (However, it will have no effect if old comma breaks are being forced because -boc is
           used).  The possible values of n are:

            n=0 break at all commas after =>
            n=1 stable: break at all commas after => if container is open,
                EXCEPT FOR one-line containers
            n=2 break at all commas after =>, BUT try to form the maximum
                maximum one-line container lengths
            n=3 do not treat commas after => specially at all
            n=4 break everything: like n=0 but ALSO break a short container with
                a => not followed by a comma when -vt=0 is used
            n=5 stable: like n=1 but ALSO break at open one-line containers when
                -vt=0 is used (default)

           For example, given the following single line, perltidy by default will not add any line breaks
           because it would break the existing one-line container:

               bless { B => $B, Root => $Root } => $package;

           Using -cab=0 will force a break after each comma-arrow item:

               # perltidy -cab=0:
               bless {
                   B    => $B,
                   Root => $Root
               } => $package;

           If perltidy is subsequently run with this container broken, then by default it will break after each
           '=>' because the container is now broken.  To reform a one-line container, the parameter -cab=2 could
           be used.

           The flag -cab=3 can be used to prevent these commas from being treated specially.  In this case, an
           item such as "01" => 31 is treated as a single item in a table.  The number of fields in this table
           will be determined by the same rules that are used for any other table.  Here is an example.

               # perltidy -cab=3
               my %last_day = (
                   "01" => 31, "02" => 29, "03" => 31, "04" => 30,
                   "05" => 31, "06" => 30, "07" => 31, "08" => 31,
                   "09" => 30, "10" => 31, "11" => 30, "12" => 31
               );

   Retaining or Ignoring Existing Line Breaks
       Several additional parameters are available for controlling the extent to which line breaks in the input
       script influence the output script.  In most cases, the default parameter values are set so that, if a
       choice is possible, the output style follows the input style.  For example, if a short logical container
       is broken in the input script, then the default behavior is for it to remain broken in the output script.

       Most of the parameters in this section would only be required for a one-time conversion of a script from
       short container lengths to longer container lengths.  The opposite effect, of converting long container
       lengths to shorter lengths, can be obtained by temporarily using a short maximum line length.

       -bol,  --break-at-old-logical-breakpoints
           By default, if a logical expression is broken at a "&&", "||", "and", or "or", then the container
           will remain broken.  Also, breaks at internal keywords "if" and "unless" will normally be retained.
           To prevent this, and thus form longer lines, use -nbol.

       -bok,  --break-at-old-keyword-breakpoints
           By default, perltidy will retain a breakpoint before keywords which may return lists, such as "sort"
           and <map>.  This allows chains of these operators to be displayed one per line.  Use -nbok to prevent
           retaining these breakpoints.

       -bot,  --break-at-old-ternary-breakpoints
           By default, if a conditional (ternary) operator is broken at a ":", then it will remain broken.  To
           prevent this, and thereby form longer lines, use -nbot.

       -boa,  --break-at-old-attribute-breakpoints
           By default, if an attribute list is broken at a ":" in the source file, then it will remain broken.
           For example, given the following code, the line breaks at the ':'s will be retained:

                               my @field
                                 : field
                                 : Default(1)
                                 : Get('Name' => 'foo') : Set('Name');

           If the attributes are on a single line in the source code then they will remain on a single line if
           possible.

           To prevent this, and thereby always form longer lines, use -nboa.

       -iob,  --ignore-old-breakpoints
           Use this flag to tell perltidy to ignore existing line breaks to the maximum extent possible.  This
           will tend to produce the longest possible containers, regardless of type, which do not exceed the
           line length limit.

       -kis,  --keep-interior-semicolons
           Use the -kis flag to prevent breaking at a semicolon if there was no break there in the input file.
           Normally perltidy places a newline after each semicolon which terminates a statement unless several
           statements are contained within a one-line brace block.  To illustrate, consider the following input
           lines:

               dbmclose(%verb_delim); undef %verb_delim;
               dbmclose(%expanded); undef %expanded;

           The default is to break after each statement, giving

               dbmclose(%verb_delim);
               undef %verb_delim;
               dbmclose(%expanded);
               undef %expanded;

           With perltidy -kis the multiple statements are retained:

               dbmclose(%verb_delim); undef %verb_delim;
               dbmclose(%expanded);   undef %expanded;

           The statements are still subject to the specified value of maximum-line-length and will be broken if
           this maximum is exceeded.

   Blank Line Control
       Blank lines can improve the readability of a script if they are carefully placed.  Perltidy has several
       commands for controlling the insertion, retention, and removal of blank lines.

       -fbl,  --freeze-blank-lines
           Set -fbl if you want to the blank lines in your script to remain exactly as they are.  The rest of
           the parameters in this section may then be ignored.  (Note: setting the -fbl flag is equivalent to
           setting -mbl=0 and -kbl=2).

       -bbc,  --blanks-before-comments
           A blank line will be introduced before a full-line comment.  This is the default.  Use -nbbc or
           --noblanks-before-comments to prevent such blank lines from being introduced.

       -blbs=n,  --blank-lines-before-subs=n
           The parameter -blbs=n requests that least n blank lines precede a sub definition which does not
           follow a comment and which is more than one-line long.  The default is <-blbs=1>.  BEGIN and END
           blocks are included.

           The requested number of blanks statement will be inserted regardless of the value of
           --maximum-consecutive-blank-lines=n (-mbl=n) with the exception that if -mbl=0 then no blanks will be
           output.

           This parameter interacts with the value k of the parameter --maximum-consecutive-blank-lines=k
           (-mbl=k) as follows:

           1. If -mbl=0 then no blanks will be output.  This allows all blanks to be suppressed with a single
           parameter.  Otherwise,

           2. If the number of old blank lines in the script is less than n then additional blanks will be
           inserted to make the total n regardless of the value of -mbl=k.

           3. If the number of old blank lines in the script equals or exceeds n then this parameter has no
           effect, however the total will not exceed value specified on the -mbl=k flag.

       -blbp=n,  --blank-lines-before-packages=n
           The parameter -blbp=n requests that least n blank lines precede a package which does not follow a
           comment.  The default is <-blbp=1>.

           This parameter interacts with the value k of the parameter --maximum-consecutive-blank-lines=k
           (-mbl=k) in the same way as described for the previous item -blbs=n.

       -bbs,  --blanks-before-subs
           For compatibility with previous versions, -bbs or --blanks-before-subs is equivalent to -blbp=1 and
           -blbs=1.

           Likewise, -nbbs or --noblanks-before-subs is equivalent to -blbp=0 and -blbs=0.

       -bbb,  --blanks-before-blocks
           A blank line will be introduced before blocks of coding delimited by for, foreach, while, until, and
           if, unless, in the following circumstances:

           •   The block is not preceded by a comment.

           •   The block is not a one-line block.

           •   The number of consecutive non-blank lines at the current indentation depth is at least -lbl (see
               next section).

           This is the default.  The intention of this option is to introduce some space within dense coding.
           This is negated with -nbbb or  --noblanks-before-blocks.

       -lbl=n --long-block-line-count=n
           This controls how often perltidy is allowed to add blank lines before certain block types (see
           previous section).  The default is 8.  Entering a value of 0 is equivalent to entering a very large
           number.

       -mbl=n --maximum-consecutive-blank-lines=n
           This parameter specifies the maximum number of consecutive blank lines which will be output within
           code sections of a script.  The default is n=1.  If the input file has more than n consecutive blank
           lines, the number will be reduced to n except as noted above for the -blbp and -blbs parameters.  If
           n=0 then no blank lines will be output (unless all old blank lines are retained with the -kbl=2 flag
           of the next section).

           This flag obviously does not apply to pod sections, here-documents, and quotes.

       -kbl=n,  --keep-old-blank-lines=n
           The -kbl=n flag gives you control over how your existing blank lines are treated.

           The possible values of n are:

            n=0 ignore all old blank lines
            n=1 stable: keep old blanks, but limited by the value of the B<-mbl=n> flag
            n=2 keep all old blank lines, regardless of the value of the B<-mbl=n> flag

           The default is n=1.

       -sob,  --swallow-optional-blank-lines
           This is equivalent to kbl=0 and is included for compatibility with previous versions.

       -nsob,  --noswallow-optional-blank-lines
           This is equivalent to kbl=1 and is included for compatibility with previous versions.

   Styles
       A style refers to a convenient collection of existing parameters.

       -gnu, --gnu-style
           -gnu gives an approximation to the GNU Coding Standards (which do not apply to perl) as they are
           sometimes implemented.  At present, this style overrides the default style with the following
           parameters:

               -lp -bl -noll -pt=2 -bt=2 -sbt=2 -icp

       -pbp, --perl-best-practices
           -pbp is an abbreviation for the parameters in the book Perl Best Practices by Damian Conway:

               -l=78 -i=4 -ci=4 -st -se -vt=2 -cti=0 -pt=1 -bt=1 -sbt=1 -bbt=1 -nsfs -nolq
               -wbb="% + - * / x != == >= <= =~ !~ < > | & =
                     **= += *= &= <<= &&= -= /= |= >>= ||= //= .= %= ^= x="

           Please note that this parameter set includes -st and -se flags, which make perltidy act as a filter
           on one file only.  These can be overridden by placing -nst and/or -nse after the -pbp parameter.

           Also note that the value of continuation indentation, -ci=4, is equal to the value of the full
           indentation, -i=4.  In some complex statements perltidy will produce nicer results with -ci=2. This
           can be implemented by including -ci=2 after the -pbp parameter.  For example,

               # perltidy -pbp
               $self->{_text} = (
                    !$section        ? ''
                   : $type eq 'item' ? "the $section entry"
                   :                   "the section on $section"
                   )
                   . (
                   $page
                   ? ( $section ? ' in ' : '' ) . "the $page$page_ext manpage"
                   : ' elsewhere in this document'
                   );

               # perltidy -pbp -ci=2
               $self->{_text} = (
                    !$section        ? ''
                   : $type eq 'item' ? "the $section entry"
                   :                   "the section on $section"
                 )
                 . (
                   $page
                   ? ( $section ? ' in ' : '' ) . "the $page$page_ext manpage"
                   : ' elsewhere in this document'
                 );

   Other Controls
       Deleting selected text
           Perltidy can selectively delete comments and/or pod documentation.  The command -dac or
           --delete-all-comments will delete all comments and all pod documentation, leaving just code and any
           leading system control lines.

           The command -dp or --delete-pod will remove all pod documentation (but not comments).

           Two commands which remove comments (but not pod) are: -dbc or --delete-block-comments and -dsc or
           --delete-side-comments.  (Hanging side comments will be deleted with block comments here.)

           The negatives of these commands also work, and are the defaults.  When block comments are deleted,
           any leading 'hash-bang' will be retained.  Also, if the -x flag is used, any system commands before a
           leading hash-bang will be retained (even if they are in the form of comments).

       Writing selected text to a file
           When perltidy writes a formatted text file, it has the ability to also send selected text to a file
           with a .TEE extension.  This text can include comments and pod documentation.

           The command -tac or  --tee-all-comments will write all comments and all pod documentation.

           The command -tp or --tee-pod will write all pod documentation (but not comments).

           The commands which write comments (but not pod) are: -tbc or --tee-block-comments and -tsc or
           --tee-side-comments.  (Hanging side comments will be written with block comments here.)

           The negatives of these commands also work, and are the defaults.

       Using a .perltidyrc command file
           If you use perltidy frequently, you probably won't be happy until you create a .perltidyrc file to
           avoid typing commonly-used parameters.  Perltidy will first look in your current directory for a
           command file named .perltidyrc.  If it does not find one, it will continue looking for one in other
           standard locations.

           These other locations are system-dependent, and may be displayed with the command "perltidy -dpro".
           Under Unix systems, it will first look for an environment variable PERLTIDY.  Then it will look for a
           .perltidyrc file in the home directory, and then for a system-wide file /usr/local/etc/perltidyrc,
           and then it will look for /etc/perltidyrc.  Note that these last two system-wide files do not have a
           leading dot.  Further system-dependent information will be found in the INSTALL file distributed with
           perltidy.

           Under Windows, perltidy will also search for a configuration file named perltidy.ini since Windows
           does not allow files with a leading period (.).  Use "perltidy -dpro" to see the possible locations
           for your system.  An example might be C:\Documents and Settings\All Users\perltidy.ini.

           Another option is the use of the PERLTIDY environment variable.  The method for setting environment
           variables depends upon the version of Windows that you are using.  Instructions for Windows 95 and
           later versions can be found here:

           http://www.netmanage.com/000/20021101_005_tcm21-6336.pdf

           Under Windows NT / 2000 / XP the PERLTIDY environment variable can be placed in either the user
           section or the system section.  The later makes the configuration file common to all users on the
           machine.  Be sure to enter the full path of the configuration file in the value of the environment
           variable.  Ex.  PERLTIDY=C:\Documents and Settings\perltidy.ini

           The configuration file is free format, and simply a list of parameters, just as they would be entered
           on a command line.  Any number of lines may be used, with any number of parameters per line, although
           it may be easiest to read with one parameter per line.  Comment text begins with a #, and there must
           also be a space before the # for side comments.  It is a good idea to put complex parameters in
           either single or double quotes.

           Here is an example of a .perltidyrc file:

             # This is a simple of a .perltidyrc configuration file
             # This implements a highly spaced style
             -se    # errors to standard error output
             -w     # show all warnings
             -bl    # braces on new lines
             -pt=0  # parens not tight at all
             -bt=0  # braces not tight
             -sbt=0 # square brackets not tight

           The parameters in the .perltidyrc file are installed first, so any parameters given on the command
           line will have priority over them.

           To avoid confusion, perltidy ignores any command in the .perltidyrc file which would cause some kind
           of dump and an exit.  These are:

            -h -v -ddf -dln -dop -dsn -dtt -dwls -dwrs -ss

           There are several options may be helpful in debugging a .perltidyrc file:

           •   A very helpful command is --dump-profile or -dpro.  It writes a list of all configuration
               filenames tested to standard output, and if a file is found, it dumps the content to standard
               output before exiting.  So, to find out where perltidy looks for its configuration files, and
               which one if any it selects, just enter

                 perltidy -dpro

           •   It may be simplest to develop and test configuration files with alternative names, and invoke
               them with -pro=filename on the command line.  Then rename the desired file to .perltidyrc when
               finished.

           •   The parameters in the .perltidyrc file can be switched off with the -npro option.

           •   The commands --dump-options, --dump-defaults, --dump-long-names, and --dump-short-names, all
               described below, may all be helpful.

       Creating a new abbreviation
           A special notation is available for use in a .perltidyrc file for creating an abbreviation for a
           group of options.  This can be used to create a shorthand for one or more styles which are
           frequently, but not always, used.  The notation is to group the options within curly braces which are
           preceded by the name of the alias (without leading dashes), like this:

                   newword {
                   -opt1
                   -opt2
                   }

           where newword is the abbreviation, and opt1, etc, are existing parameters or other abbreviations.
           The main syntax requirement is that the new abbreviation must begin on a new line.  Space before and
           after the curly braces is optional.  For a specific example, the following line

                   airy {-bl -pt=0 -bt=0 -sbt=0}

           could be placed in a .perltidyrc file, and then invoked at will with

                   perltidy -airy somefile.pl

           (Either "-airy" or "--airy" may be used).

       Skipping leading non-perl commands with -x or --look-for-hash-bang
           If your script has leading lines of system commands or other text which are not valid perl code, and
           which are separated from the start of the perl code by a "hash-bang" line, ( a line of the form
           "#!...perl" ), you must use the -x flag to tell perltidy not to parse and format any lines before the
           "hash-bang" line.  This option also invokes perl with a -x flag when checking the syntax.  This
           option was originally added to allow perltidy to parse interactive VMS scripts, but it should be used
           for any script which is normally invoked with "perl -x".

       Making a file unreadable
           The goal of perltidy is to improve the readability of files, but there are two commands which have
           the opposite effect, --mangle and --extrude.  They are actually merely aliases for combinations of
           other parameters.  Both of these strip all possible whitespace, but leave comments and pod documents,
           so that they are essentially reversible.  The difference between these is that --mangle puts the
           fewest possible line breaks in a script while --extrude puts the maximum possible.  Note that these
           options do not provided any meaningful obfuscation, because perltidy can be used to reformat the
           files.  They were originally developed to help test the tokenization logic of perltidy, but they have
           other uses.  One use for --mangle is the following:

             perltidy --mangle myfile.pl -st | perltidy -o myfile.pl.new

           This will form the maximum possible number of one-line blocks (see next section), and can sometimes
           help clean up a badly formatted script.

           A similar technique can be used with --extrude instead of --mangle to make the minimum number of one-
           line blocks.

           Another use for --mangle is to combine it with -dac to reduce the file size of a perl script.

       One-line blocks
           There are a few points to note regarding one-line blocks.  A one-line block is something like this,

                   if ($x > 0) { $y = 1 / $x }

           where the contents within the curly braces is short enough to fit on a single line.

           With few exceptions, perltidy retains existing one-line blocks, if it is possible within the line-
           length constraint, but it does not attempt to form new ones.  In other words, perltidy will try to
           follow the one-line block style of the input file.

           If an existing one-line block is longer than the maximum line length, however, it will be broken into
           multiple lines.  When this happens, perltidy checks for and adds any optional terminating semicolon
           (unless the -nasc option is used) if the block is a code block.

           The main exception is that perltidy will attempt to form new one-line blocks following the keywords
           "map", "eval", and "sort", because these code blocks are often small and most clearly displayed in a
           single line.

           One-line block rules can conflict with the cuddled-else option.  When the cuddled-else option is
           used, perltidy retains existing one-line blocks, even if they do not obey cuddled-else formatting.

           Occasionally, when one-line blocks get broken because they exceed the available line length, the
           formatting will violate the requested brace style.  If this happens, reformatting the script a second
           time should correct the problem.

       Debugging
           The following flags are available for debugging:

           --dump-defaults or -ddf will write the default option set to standard output and quit

           --dump-profile or -dpro  will write the name of the current configuration file and its contents to
           standard output and quit.

           --dump-options or -dop  will write current option set to standard output and quit.

           --dump-long-names or -dln  will write all command line long names (passed to Get_options) to standard
           output and quit.

           --dump-short-names  or -dsn will write all command line short names to standard output and quit.

           --dump-token-types or -dtt  will write a list of all token types to standard output and quit.

           --dump-want-left-space or -dwls  will write the hash %want_left_space to standard output and quit.
           See the section on controlling whitespace around tokens.

           --dump-want-right-space or -dwrs  will write the hash %want_right_space to standard output and quit.
           See the section on controlling whitespace around tokens.

           --no-memoize or -nmem  will turn of memoizing.  Memoization can reduce run time when running perltidy
           repeatedly in a single process.  It is on by default but can be deactivated for testing with -nmem.

           -DEBUG  will write a file with extension .DEBUG for each input file showing the tokenization of all
           lines of code.

       Working with MakeMaker, AutoLoader and SelfLoader
           The first $VERSION line of a file which might be eval'd by MakeMaker is passed through unchanged
           except for indentation.  Use --nopass-version-line, or -npvl, to deactivate this feature.

           If the AutoLoader module is used, perltidy will continue formatting code after seeing an __END__
           line.  Use --nolook-for-autoloader, or -nlal, to deactivate this feature.

           Likewise, if the SelfLoader module is used, perltidy will continue formatting code after seeing a
           __DATA__ line.  Use --nolook-for-selfloader, or -nlsl, to deactivate this feature.

       Working around problems with older version of Perl
           Perltidy contains a number of rules which help avoid known subtleties and problems with older
           versions of perl, and these rules always take priority over whatever formatting flags have been set.
           For example, perltidy will usually avoid starting a new line with a bareword, because this might
           cause problems if "use strict" is active.

           There is no way to override these rules.

HTML OPTIONS

       The -html master switch
           The flag -html causes perltidy to write an html file with extension .html.  So, for example, the
           following command

                   perltidy -html somefile.pl

           will produce a syntax-colored html file named somefile.pl.html which may be viewed with a browser.

           Please Note: In this case, perltidy does not do any formatting to the input file, and it does not
           write a formatted file with extension .tdy.  This means that two perltidy runs are required to create
           a fully reformatted, html copy of a script.

       The -pre flag for code snippets
           When the -pre flag is given, only the pre-formatted section, within the <PRE> and </PRE> tags, will
           be output.  This simplifies inclusion of the output in other files.  The default is to output a
           complete web page.

       The -nnn flag for line numbering
           When the -nnn flag is given, the output lines will be numbered.

       The -toc, or --html-table-of-contents flag
           By default, a table of contents to packages and subroutines will be written at the start of html
           output.  Use -ntoc to prevent this.  This might be useful, for example, for a pod document which
           contains a number of unrelated code snippets.  This flag only influences the code table of contents;
           it has no effect on any table of contents produced by pod2html (see next item).

       The -pod, or --pod2html flag
           There are two options for formatting pod documentation.  The default is to pass the pod through the
           Pod::Html module (which forms the basis of the pod2html utility).  Any code sections are formatted by
           perltidy, and the results then merged.  Note: perltidy creates a temporary file when Pod::Html is
           used; see "FILES".  Also, Pod::Html creates temporary files for its cache.

           NOTE: Perltidy counts the number of "=cut" lines, and either moves the pod text to the top of the
           html file if there is one "=cut", or leaves the pod text in its original order (interleaved with
           code) otherwise.

           Most of the flags accepted by pod2html may be included in the perltidy command line, and they will be
           passed to pod2html.  In some cases, the flags have a prefix "pod" to emphasize that they are for the
           pod2html, and this prefix will be removed before they are passed to pod2html.  The flags which have
           the additional "pod" prefix are:

              --[no]podheader --[no]podindex --[no]podrecurse --[no]podquiet
              --[no]podverbose --podflush

           The flags which are unchanged from their use in pod2html are:

              --backlink=s --cachedir=s --htmlroot=s --libpods=s --title=s
              --podpath=s --podroot=s

           where 's' is an appropriate character string.  Not all of these flags are available in older versions
           of Pod::Html.  See your Pod::Html documentation for more information.

           The alternative, indicated with -npod, is not to use Pod::Html, but rather to format pod text in
           italics (or whatever the stylesheet indicates), without special html markup.  This is useful, for
           example, if pod is being used as an alternative way to write comments.

       The -frm, or --frames flag
           By default, a single html output file is produced.  This can be changed with the -frm option, which
           creates a frame holding a table of contents in the left panel and the source code in the right side.
           This simplifies code browsing.  Assume, for example, that the input file is MyModule.pm.  Then, for
           default file extension choices, these three files will be created:

            MyModule.pm.html      - the frame
            MyModule.pm.toc.html  - the table of contents
            MyModule.pm.src.html  - the formatted source code

           Obviously this file naming scheme requires that output be directed to a real file (as opposed to,
           say, standard output).  If this is not the case, or if the file extension is unknown, the -frm option
           will be ignored.

       The -text=s, or --html-toc-extension flag
           Use this flag to specify the extra file extension of the table of contents file when html frames are
           used.  The default is "toc".  See "Specifying File Extensions".

       The -sext=s, or --html-src-extension flag
           Use this flag to specify the extra file extension of the content file when html frames are used.  The
           default is "src".  See "Specifying File Extensions".

       The -hent, or --html-entities flag
           This flag controls the use of Html::Entities for html formatting.  By default, the module
           Html::Entities is used to encode special symbols.  This may not be the right thing for some
           browser/language combinations.  Use --nohtml-entities or -nhent to prevent this.

       Style Sheets
           Style sheets make it very convenient to control and adjust the appearance of html pages.  The default
           behavior is to write a page of html with an embedded style sheet.

           An alternative to an embedded style sheet is to create a page with a link to an external style sheet.
           This is indicated with the -css=filename,  where the external style sheet is filename.  The external
           style sheet filename will be created if and only if it does not exist.  This option is useful for
           controlling multiple pages from a single style sheet.

           To cause perltidy to write a style sheet to standard output and exit, use the -ss, or --stylesheet,
           flag.  This is useful if the style sheet could not be written for some reason, such as if the -pre
           flag was used.  Thus, for example,

             perltidy -html -ss >mystyle.css

           will write a style sheet with the default properties to file mystyle.css.

           The use of style sheets is encouraged, but a web page without a style sheets can be created with the
           flag -nss.  Use this option if you must to be sure that older browsers (roughly speaking, versions
           prior to 4.0 of Netscape Navigator and Internet Explorer) can display the syntax-coloring of the html
           files.

       Controlling HTML properties
           Note: It is usually more convenient to accept the default properties and then edit the stylesheet
           which is produced.  However, this section shows how to control the properties with flags to perltidy.

           Syntax colors may be changed from their default values by flags of the either the long form,
           -html-color-xxxxxx=n, or more conveniently the short form, -hcx=n, where xxxxxx is one of the
           following words, and x is the corresponding abbreviation:

                 Token Type             xxxxxx           x
                 ----------             --------         --
                 comment                comment          c
                 number                 numeric          n
                 identifier             identifier       i
                 bareword, function     bareword         w
                 keyword                keyword          k
                 quite, pattern         quote            q
                 here doc text          here-doc-text    h
                 here doc target        here-doc-target  hh
                 punctuation            punctuation      pu
                 parentheses            paren            p
                 structural braces      structure        s
                 semicolon              semicolon        sc
                 colon                  colon            co
                 comma                  comma            cm
                 label                  label            j
                 sub definition name    subroutine       m
                 pod text               pod-text         pd

           A default set of colors has been defined, but they may be changed by providing values to any of the
           following parameters, where n is either a 6 digit hex RGB color value or an ascii name for a color,
           such as 'red'.

           To illustrate, the following command will produce an html file somefile.pl.html with "aqua" keywords:

                   perltidy -html -hck=00ffff somefile.pl

           and this should be equivalent for most browsers:

                   perltidy -html -hck=aqua somefile.pl

           Perltidy merely writes any non-hex names that it sees in the html file.  The following 16 color names
           are defined in the HTML 3.2 standard:

                   black   => 000000,
                   silver  => c0c0c0,
                   gray    => 808080,
                   white   => ffffff,
                   maroon  => 800000,
                   red     => ff0000,
                   purple  => 800080,
                   fuchsia => ff00ff,
                   green   => 008000,
                   lime    => 00ff00,
                   olive   => 808000,
                   yellow  => ffff00
                   navy    => 000080,
                   blue    => 0000ff,
                   teal    => 008080,
                   aqua    => 00ffff,

           Many more names are supported in specific browsers, but it is safest to use the hex codes for other
           colors.  Helpful color tables can be located with an internet search for "HTML color tables".

           Besides color, two other character attributes may be set: bold, and italics.  To set a token type to
           use bold, use the flag --html-bold-xxxxxx or -hbx, where xxxxxx or x are the long or short names from
           the above table.  Conversely, to set a token type to NOT use bold, use --nohtml-bold-xxxxxx or -nhbx.

           Likewise, to set a token type to use an italic font, use the flag --html-italic-xxxxxx or -hix, where
           again xxxxxx or x are the long or short names from the above table.  And to set a token type to NOT
           use italics, use --nohtml-italic-xxxxxx or -nhix.

           For example, to use bold braces and lime color, non-bold, italics keywords the following command
           would be used:

                   perltidy -html -hbs -hck=00FF00 -nhbk -hik somefile.pl

           The background color can be specified with --html-color-background=n, or -hcbg=n for short, where n
           is a 6 character hex RGB value.  The default color of text is the value given to punctuation, which
           is black as a default.

           Here are some notes and hints:

           1. If you find a preferred set of these parameters, you may want to create a .perltidyrc file
           containing them.  See the perltidy man page for an explanation.

           2. Rather than specifying values for these parameters, it is probably easier to accept the defaults
           and then edit a style sheet.  The style sheet contains comments which should make this easy.

           3. The syntax-colored html files can be very large, so it may be best to split large files into
           smaller pieces to improve download times.

SOME COMMON INPUT CONVENTIONS

   Specifying Block Types
       Several parameters which refer to code block types may be customized by also specifying an associated
       list of block types.  The type of a block is the name of the keyword which introduces that block, such as
       if, else, or sub.  An exception is a labeled block, which has no keyword, and should be specified with
       just a colon.  To specify all blocks use '*'.

       For example, the following parameter specifies "sub", labels, "BEGIN", and "END" blocks:

          -cscl="sub : BEGIN END"

       (the meaning of the -cscl parameter is described above.)  Note that quotes are required around the list
       of block types because of the spaces.  For another example, the following list specifies all block types
       for vertical tightness:

          -bbvtl='*'

   Specifying File Extensions
       Several parameters allow default file extensions to be overridden.  For example, a backup file extension
       may be specified with -bext=ext, where ext is some new extension.  In order to provides the user some
       flexibility, the following convention is used in all cases to decide if a leading '.' should be used.  If
       the extension "ext" begins with "A-Z", "a-z", or "0-9", then it will be appended to the filename with an
       intermediate '.' (or perhaps an '_' on VMS systems).  Otherwise, it will be appended directly.

       For example, suppose the file is somefile.pl.  For "-bext=old", a '.' is added to give somefile.pl.old.
       For "-bext=.old", no additional '.' is added, so again the backup file is somefile.pl.old.  For
       "-bext=~", then no dot is added, and the backup file will be somefile.pl~  .

SWITCHES WHICH MAY BE NEGATED

       The following list shows all short parameter names which allow a prefix 'n' to produce the negated form:

        D    anl asc  aws  b    bbb bbc bbs  bl   bli  boc bok  bol  bot  ce
        csc  dac dbc  dcsc ddf  dln dnl dop  dp   dpro dsc dsm  dsn  dtt  dwls
        dwrs dws f    fll  frm  fs  hsc html ibc  icb  icp iob  isbc lal  log
        lp   lsl ohbr okw  ola  oll opr opt  osbr otr  ple  pod  pvl  q
        sbc  sbl schb scp  scsb sct se  sfp  sfs  skp  sob sohb sop  sosb sot
        ssc  st  sts  syn  t    tac tbc toc  tp   tqw  tsc w    x    bar  kis

       Equivalently, the prefix 'no' or 'no-' on the corresponding long names may be used.

LIMITATIONS

       Parsing Limitations
           Perltidy should work properly on most perl scripts.  It does a lot of self-checking, but still, it is
           possible that an error could be introduced and go undetected.  Therefore, it is essential to make
           careful backups and to test reformatted scripts.

           The main current limitation is that perltidy does not scan modules included with 'use' statements.
           This makes it necessary to guess the context of any bare words introduced by such modules.  Perltidy
           has good guessing algorithms, but they are not infallible.  When it must guess, it leaves a message
           in the log file.

           If you encounter a bug, please report it.

       What perltidy does not parse and format
           Perltidy indents but does not reformat comments and "qw" quotes.  Perltidy does not in any way modify
           the contents of here documents or quoted text, even if they contain source code.  (You could,
           however, reformat them separately).  Perltidy does not format 'format' sections in any way.  And, of
           course, it does not modify pod documents.

FILES

       Temporary files
           Under the -html option with the default --pod2html flag, a temporary file is required to pass text to
           Pod::Html.  Unix systems will try to use the POSIX tmpnam() function.  Otherwise the file
           perltidy.TMP will be temporarily created in the current working directory.

       Special files when standard input is used
           When standard input is used, the log file, if saved, is perltidy.LOG, and any errors are written to
           perltidy.ERR unless the -se flag is set.  These are saved in the current working directory.

       Files overwritten
           The following file extensions are used by perltidy, and files with these extensions may be
           overwritten or deleted: .ERR, .LOG, .TEE, and/or .tdy, .html, and .bak, depending on the run type and
           settings.

       Files extensions limitations
           Perltidy does not operate on files for which the run could produce a file with a duplicated file
           extension.  These extensions include .LOG, .ERR, .TEE, and perhaps .tdy and .bak, depending on the
           run type.  The purpose of this rule is to prevent generating confusing filenames such as
           somefile.tdy.tdy.tdy.

SEE ALSO

       perlstyle(1), Perl::Tidy(3)

VERSION

       This man page documents perltidy version 20140328.

CREDITS

       Michael Cartmell supplied code for adaptation to VMS and helped with v-strings.

       Yves Orton supplied code for adaptation to the various versions of Windows.

       Axel Rose supplied a patch for MacPerl.

       Hugh S. Myers designed and implemented the initial Perl::Tidy module interface.

       Many others have supplied key ideas, suggestions, and bug reports; see the CHANGES file.

AUTHOR

         Steve Hancock
         email: perltidy at users.sourceforge.net
         http://perltidy.sourceforge.net

       Copyright (c) 2000-2012 by Steve Hancock

LICENSE

       This package is free software; you can redistribute it and/or modify it under the terms of the "GNU
       General Public License".

       Please refer to the file "COPYING" for details.

DISCLAIMER

       This package is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
       the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

       See the "GNU General Public License" for more details.