Provided by: universal-ctags_5.9.20210829.0-1_amd64 bug

NAME

       ctags - Generate tag files for source code

SYNOPSIS

       ctags [<options>] [<source_file(s)>]
       etags [<options>] [<source_file(s)>]

DESCRIPTION

       The  ctags  and  etags  (see  -e option) programs (hereinafter collectively referred to as
       ctags, except where distinguished) generate an index (or "tag")  file  for  a  variety  of
       language  objects  found in source file(s). This tag file allows these items to be quickly
       and easily located by a text editor or other utilities (client tools). A tag  signifies  a
       language  object for which an index entry is available (or, alternatively, the index entry
       created for that object).

       Alternatively, ctags can generate a cross reference file which lists,  in  human  readable
       form, information about the various language objects found in a set of source files.

       Tag  index  files  are  supported  by numerous editors, which allow the user to locate the
       object associated with a name appearing in a source file and jump to  the  file  and  line
       which  defines  the  name.  See  the  manual of your favorite editor about utilizing ctags
       command and the tag index files in the editor.

       ctags is capable of generating  different  kinds  of  tags  for  each  of  many  different
       languages.  For  a  complete  list  of  supported  languages,  the names by which they are
       recognized, and the kinds of tags which are generated for each, see  the  --list-languages
       and --list-kinds-full options.

       This man page describes Universal Ctags, an implementation of ctags derived from Exuberant
       Ctags. The major incompatible changes between Universal  Ctags  and  Exuberant  Ctags  are
       enumerated in ctags-incompatibilities(7).

       One  of  the advantages of Exuberant Ctags is that it allows a user to define a new parser
       from the command line. Extending this capability is one of the major features of Universal
       Ctags. ctags-optlib(7) describes how the capability is extended.

       Newly  introduced  experimental  features are not explained here. If you are interested in
       such features and ctags internals, visit https://docs.ctags.io/.

COMMAND LINE INTERFACE

       Despite the wealth of available options, defaults are set so that ctags is  most  commonly
       executed  without  any  options  (e.g.  "ctags *", or "ctags -R"), which will create a tag
       file in the current directory for all recognized source files. The options described below
       are provided merely to allow custom tailoring to meet special needs.

       Note that spaces separating the single-letter options from their parameters are optional.

       Note  also  that  the boolean parameters to the long form options (those beginning with --
       and that take a [=(yes|no)] parameter) may be omitted, in  which  case  =yes  is  implied.
       (e.g.  --sort  is  equivalent  to  --sort=yes).   Note further that =1, =on, and =true are
       considered synonyms for =yes, and that =0, =off, and =false are  considered  synonyms  for
       =no.

       Some  options are either ignored or useful only when used while running in etags mode (see
       -e option). Such options will be noted.

       <options> must precede the <source_file(s)> following the standard POSIX convention.

       Options taking language names will accept those names in either upper or lower  case.  See
       the --list-languages option for a complete list of the built-in language names.

   Letters and names
       Some options take one-letter flags as parameters (e.g. --kinds-<LANG> option).  Specifying
       just letters help a user create a complicated command line quickly.   However,  a  command
       line including sequences of one-letter flags becomes difficult to understand.

       Universal  Ctags  accepts  long-name  flags  in  addition  to  such  one-letter flags. The
       long-name and one-letter flags can be mixed in an option  parameter  by  surrounding  each
       long-name  by  braces.  Thus,  for an example, the following three notations for --kinds-C
       option have the same meaning:

          --kinds-C=+pLl
          --kinds-C=+{prototype}{label}{local}
          --kinds-C=+{prototype}L{local}

       Note that braces may be meta characters in your shell. Put single quotes in such case.

       --list-... options shows one-letter flags and associated long-name flags.

   List options
       Universal Ctags introduces many --list-... options  that  provide  the  internal  data  of
       Universal  Ctags  (See  "Listing  Options"). Both users and client tools may use the data.
       --with-list-header and --machinable options adjust the output of the  most  of  --list-...
       options.

       The   default   setting   (--with-list-header=yes   and   --machinable=no)  is  for  using
       interactively from a terminal. The header that explains the meaning of columns  is  simply
       added  to the output, and each column is aligned in all lines. The header line starts with
       a hash ('#') character.

       For scripting in a client tool, --with-list-header=no and --machinable=yes may be  useful.
       The header is not added to the output, and each column is separated by tab characters.

       Note  the  order  of  columns  will  change in the future release.  However, labels in the
       header will not change. So by scanning the header, a client tool can find  the  index  for
       the target column.

OPTIONS

       ctags  has  more options than listed here.  Options starting with an underscore character,
       such as --_echo=<msg>, are not  listed  here.  They  are  experimental  or  for  debugging
       purpose.

       Notation: <foo> is for a variable string foo, [ ... ] for optional, | for selection, and (
       ... ) for grouping.  For example --foo[=(yes|no)]'' means ``--foo, -foo=yes, or -foo=no.

   Input/Output File Options
       --exclude=<pattern>
              Add <pattern> to a list of excluded files  and  directories.  This  option  may  be
              specified  as  many  times as desired. For each file name considered by ctags, each
              pattern specified using this option will be compared against both the complete path
              (e.g.   some/path/base.ext)  and  the  base  name (e.g. base.ext) of the file, thus
              allowing patterns which match a given file name irrespective of its path, or  match
              only a specific path.

              If  appropriate  support  is available from the runtime library of your C compiler,
              then pattern may contain the usual shell wildcards (not regular expressions) common
              on  Unix (be sure to quote the option parameter to protect the wildcards from being
              expanded by the shell before being passed to ctags; also be  aware  that  wildcards
              can  match  the  slash  character,  '/').  You can determine if shell wildcards are
              available on your platform by examining the output of the  --list-features  option,
              which  will  include  wildcards in the compiled feature list; otherwise, pattern is
              matched against file names using a simple textual comparison.

              If <pattern> begins with the  character  '@',  then  the  rest  of  the  string  is
              interpreted  as a file name from which to read exclusion patterns, one per line. If
              pattern is empty, the list of excluded patterns is cleared.

              Note that at program startup, the default exclude list  contains  names  of  common
              hidden and system files, patterns for binary files, and directories for which it is
              generally not desirable to descend while processing the --recurse  option.  To  see
              the list of built-in exclude patterns, use --list-excludes.

              See also the description for --exclude-exception= option.

       --exclude-exception=<pattern>
              Add  <pattern> to a list of included files and directories. The pattern affects the
              files and directories that are excluded by the pattern  specified  with  --exclude=
              option.

              For  an  example,  you  want  ctags  to ignore all files under foo directory except
              foo/main.c,     use     the     following     command     line:     --exclude=foo/*
              --exclude-exception=foo/main.c.

       --filter[=(yes|no)]
              Makes  ctags  behave as a filter, reading source file names from standard input and
              printing their tags to standard output  on  a  file-by-file  basis.  If  --sort  is
              enabled,  tags  are  sorted  only within the source file in which they are defined.
              File names are read from standard input in line-oriented input mode (see  note  for
              -L  option)  and  only after file names listed on the command line or from any file
              supplied using the -L option. When this option is enabled, the options -f, -o,  and
              --totals are ignored. This option is quite esoteric and is disabled by default.

       --filter-terminator=<string>
              Specifies  a  <string> to print to standard output following the tags for each file
              name parsed when the --filter option is enabled. This  may  permit  an  application
              reading the output of ctags to determine when the output for each file is finished.

              Note  that  if  the  file  name  read is a directory and --recurse is enabled, this
              string will be printed only once at the end of all tags found for by descending the
              directory. This string will always be separated from the last tag line for the file
              by its terminating newline.

              This option is quite esoteric and is empty by default.

       --links[=(yes|no)]
              Indicates whether symbolic links (if supported) should be followed.  When disabled,
              symbolic links are ignored. This option is on by default.

       --maxdepth=<N>
              Limits the depth of directory recursion enabled with the --recurse (-R) option.

       --recurse[=(yes|no)]
              Recurse into directories encountered in the list of supplied files.

              If  the  list  of supplied files is empty and no file list is specified with the -L
              option, then the current directory (i.e.  '.')  is  assumed.   Symbolic  links  are
              followed by default (See --links option). If you don't like these behaviors, either
              explicitly specify the files or pipe the  output  of  find(1)  into  "ctags  -L  -"
              instead. See, also, the --exclude and --maxdepth to limit recursion.

              Note:  This option is not supported on all platforms at present. It is available if
              the output of the --help option includes this option.

       -R     Equivalent to --recurse.

       -L <file>
              Read from <file> a list of file names for which tags should be generated.

              If file is specified as '-', then file names are read  from  standard  input.  File
              names  read  using  this option are processed following file names appearing on the
              command line. Options are also accepted in this input. If this option is  specified
              more than once, only the last will apply.

              Note:  file  is  read in line-oriented mode, where a new line is the only delimiter
              and non-trailing white space is considered significant, in order  that  file  names
              containing  spaces  may be supplied (however, trailing white space is stripped from
              lines); this can affect how options are parsed if included in the input.

       --append[=(yes|no)]
              Indicates whether tags generated from the specified files  should  be  appended  to
              those already present in the tag file or should replace them.  This option is no by
              default.

       -a     Equivalent to --append.

       -f <tagfile>
              Use the name specified by <tagfile> for the tag file (default is "tags", or  "TAGS"
              when  running  in  etags mode). If <tagfile> is specified as '-', then the tags are
              written to standard output instead.

              ctags will stubbornly refuse to take orders if tagfile exists and  its  first  line
              contains  something  other  than a valid tags line. This will save your neck if you
              mistakenly type "ctags -f *.c", which would otherwise overwrite your first  C  file
              with   the   tags  generated  by  the  rest!  It  will  also  refuse  to  accept  a
              multi-character file name which begins with a '-' (dash) character, since this most
              likely  means that you left out the tag file name and this option tried to grab the
              next option as the file name. If you really want  to  name  your  output  tag  file
              -ugly, specify it as "-f ./-ugly".

              This  option  must  appear  before the first file name. If this option is specified
              more than once, only the last will apply.

       -o <tagfile>
              Equivalent to "-f tagfile".

   Output Format Options
       --format=(1|2)
              Change the format of the output tag file. Currently the only valid values for level
              are  1 or 2. Level 1 specifies the original tag file format and level 2 specifies a
              new extended format containing extension fields (but  in  a  manner  which  retains
              backward-compatibility  with  original vi(1) implementations). The default level is
              2.  [Ignored in etags mode]

       --output-format=(u-ctags|e-ctags|etags|xref|json)
              Specify the output format. The default is u-ctags.  See  tags(5)  for  u-ctags  and
              e-ctags.   See -e for etags, and -x for xref.  json format is available only if the
              ctags executable is built with  libjansson.   See  ctags-client-tools(7)  for  more
              about json format.

       -e     Same as --output-format=etags.  Enable etags mode, which will create a tag file for
              use with the Emacs editor. Alternatively, if ctags is invoked by a name  containing
              the  string  "etags"  (either  by renaming, or creating a link to, the executable),
              etags mode will be enabled.

       -x     Same as --output-format=xref.  Print  a  tabular,  human-readable  cross  reference
              (xref)  file  to  standard output instead of generating a tag file. The information
              contained in the output includes: the tag name; the kind of tag; the  line  number,
              file  name,  and  source  line (with extra white space condensed) of the file which
              defines the tag. No tag file is written and all options affecting tag  file  output
              will be ignored.

              Example  applications  for  this  feature are generating a listing of all functions
              located in a source file (e.g. "ctags -x --kinds-c=f file"), or generating  a  list
              of all externally visible global variables located in a source file (e.g. "ctags -x
              --kinds-c=v --extras=-F file").

       --sort=(yes|no|foldcase)
              Indicates whether the tag file should be sorted on the tag name (default  is  yes).
              Note  that  the  original vi(1) required sorted tags.  The foldcase value specifies
              case insensitive (or case-folded) sorting.   Fast  binary  searches  of  tag  files
              sorted  with  case-folding will require special support from tools using tag files,
              such as that found in the ctags readtags library, or  Vim  version  6.2  or  higher
              (using "set ignorecase").  [Ignored in etags mode]

       -u     Equivalent to --sort=no (i.e. "unsorted").

       --etags-include=<file>
              Include a reference to <file> in the tag file. This option may be specified as many
              times as desired. This supports Emacs' capability to use a tag file which  includes
              other tag files. [Available only in etags mode]

       --input-encoding=<encoding>
              Specifies  the  <encoding>  of  the  input  files.   If  this  option is specified,
              Universal Ctags converts the input from this encoding to the encoding specified  by
              --output-encoding=encoding.

       --input-encoding-<LANG>=<encoding>
              Specifies  a  specific input <encoding> for <LANG>. It overrides the global default
              value given with --input-encoding.

       --output-encoding=<encoding>
              Specifies the <encoding> of the tags file.  Universal Ctags converts  the  encoding
              of  input  files from the encoding specified by --input-encoding=<encoding> to this
              encoding.

              In addition <encoding> is specified at the top the tags file as the value  for  the
              TAG_FILE_ENCODING pseudo-tag. The default value of <encoding> is UTF-8.

   Language Selection and Mapping Options
       --language-force=(<language>|auto)
              By  default,  ctags  automatically  selects the language of a source file, ignoring
              those files whose language cannot be determined (see "Determining file  language").
              This  option  forces  the  specified language (case-insensitive; either built-in or
              user-defined) to be used for every supplied file instead of automatically selecting
              the language based upon its extension.

              In  addition,  the  special  value  auto  indicates  that  the  language  should be
              automatically selected (which effectively disables this option).

       --languages=[+|-](<list>|all)
              Specifies the languages for which tag generation is enabled, with <list> containing
              a  comma-separated  list  of  language  names (case-insensitive; either built-in or
              user-defined).

              If the first language of <list> is not preceded by either a '+' or '-', the current
              list   (the  current  settings  of  enabled/disabled  languages  managed  in  ctags
              internally) will be cleared before adding or  removing  the  languages  in  <list>.
              Until  a  '-'  is  encountered,  each  language  in the <list> will be added to the
              current list.

              As either the '+' or '-' is encountered in the <list>, the languages  following  it
              are  added or removed from the current list, respectively.  Thus, it becomes simple
              to replace the current list with a new one, or to add or remove languages from  the
              current list.

              The actual list of files for which tags will be generated depends upon the language
              extension mapping in effect (see the --langmap  option).  Note  that  the  most  of
              languages, including user-defined languages, are enabled unless explicitly disabled
              using this option. Language names included in list may be any built-in language  or
              one previously defined with --langdef.

              The  default  is  all,  which  is  also  accepted  as  a  valid  argument.  See the
              --list-languages option for a list of the all (built-in and user-defined)  language
              names.

              Note  --languages=  option  works  cumulative way; the option can be specified with
              different arguments multiple times in a command line.

       --alias-<LANG>=[+|-](<pattern>|default)
              Adds ('+') or removes ('-') an alias <pattern> to a language specified with <LANG>.
              ctags refers to the alias pattern in "Determining file language" stage.

              The  parameter <pattern> is not a list. Use this option multiple times in a command
              line to add or remove multiple alias patterns.

              To restore the default language aliases, specify default.

              Using all for <LANG> has meaning in following two cases:

              --alias-all=
                     This clears aliases setting of all languages.

              --alias-all=default
                     This restores the default languages aliases for all languages.

       --guess-language-eagerly
              Looks into the file contents for heuristically guessing the proper language parser.
              See "Determining file language".

       -G     Equivalent to --guess-language-eagerly.

       --langmap=<map>[,<map>[...]]
              Controls  how file names are mapped to languages (see the --list-maps option). Each
              comma-separated  <map>  consists  of  the  language  name  (either  a  built-in  or
              user-defined  language),  a  colon,  and a list of file extensions and/or file name
              patterns. A file extension is specified by preceding the extension  with  a  period
              (e.g. .c). A file name pattern is specified by enclosing the pattern in parentheses
              (e.g.  ([Mm]akefile)).

              If appropriate support is available from the runtime library of  your  C  compiler,
              then the file name pattern may contain the usual shell wildcards common on Unix (be
              sure to quote the option parameter to protect the wildcards from being expanded  by
              the  shell  before being passed to ctags). You can determine if shell wildcards are
              available on your platform by examining the output of the  --list-features  option,
              which will include wildcards in the compiled feature list; otherwise, the file name
              patterns are matched against file names using a simple textual comparison.

              When mapping a file extension with --langmap option, it will first be unmapped from
              any other languages. (--map-<LANG> option provides more fine-grained control.)

              If  the  first  character  in a <map> is a plus sign ('+'), then the extensions and
              file name patterns in that map will  be  appended  to  the  current  map  for  that
              language; otherwise, the map will replace the current map.  For example, to specify
              that only files with extensions of .c and .x are to be treated as C language files,
              use  --langmap=c:.c.x;  to  also  add  files with extensions of .j as Java language
              files, specify --langmap=c:.c.x,java:+.j. To map makefiles (e.g. files named either
              Makefile,  makefile,  or  having  the  extension  .mak)  to a language called make,
              specify --langmap=make:([Mm]akefile).mak. To map files having no extension, specify
              a period not followed by a non-period character (e.g. '.', ..x, .x.).

              To  clear  the  mapping  for  a  particular  language  (thus  inhibiting  automatic
              generation of tags for that  language),  specify  an  empty  extension  list  (e.g.
              --langmap=fortran:).   To  restore  the  default language mappings for a particular
              language, supply the keyword default  for  the  mapping.  To  specify  restore  the
              default language mappings for all languages, specify --langmap=default.

              Note  that  file name patterns are tested before file extensions when inferring the
              language of a file. This order of  Universal  Ctags  is  different  from  Exuberant
              Ctags.  See  ctags-incompatibilities(7)  for  the  background  of this incompatible
              change.

       --map-<LANG>=[+|-]<extension>|<pattern>
              This option provides the way to control mapping(s) of file names to languages in  a
              more fine-grained way than --langmap option.

              In  ctags,  more  than  one  language  can  map  to  a  file name <pattern> or file
              <extension> (N:1 map). Alternatively, --langmap option handle only  1:1  map,  only
              one language mapping to one file name <pattern> or file <extension>.  A typical N:1
              map is seen in C++ and ObjectiveC language; both languages have a map to  .h  as  a
              file extension.

              A  file  extension is specified by preceding the extension with a period (e.g. .c).
              A file name pattern is specified by enclosing  the  pattern  in  parentheses  (e.g.
              ([Mm]akefile)).  A  prefixed  plus ('+') sign is for adding, and minus ('-') is for
              removing. No prefix means replacing the map of <LANG>.

              Unlike --langmap, <extension> (or <pattern>) is not a list.  --map-<LANG> takes one
              extension  (or  pattern).  However,  the  option  can  be  specified with different
              arguments multiple times in a command line.

   Tags File Contents Options
       See "TAG ENTRIES" about fields, kinds, roles, and extras.

       --excmd=(number|pattern|mix|combine)
              Determines the type of EX command used to locate tags in the source file.  [Ignored
              in etags mode]

              The  valid values for type (either the entire word or the first letter is accepted)
              are:

              number Use only line numbers in the tag file  for  locating  tags.  This  has  four
                     advantages:

                     1. Significantly reduces the size of the resulting tag file.

                     2. Eliminates  failures  to  find tags because the line defining the tag has
                        changed, causing the pattern match to fail (note that some editors,  such
                        as vim, are able to recover in many such instances).

                     3. Eliminates  finding  identical matching, but incorrect, source lines (see
                        "BUGS").

                     4. Retains separate entries in the tag file for lines which are identical in
                        content.  In  pattern  mode,  duplicate  entries  are dropped because the
                        search patterns they generate are identical, making the duplicate entries
                        useless.

                     However,  this  option  has  one significant drawback: changes to the source
                     files can cause the line numbers recorded in  the  tag  file  to  no  longer
                     correspond  to  the  lines in the source file, causing jumps to some tags to
                     miss the target definition by one or more lines. Basically, this  option  is
                     best  used  when  the  source  code to which it is applied is not subject to
                     change. Selecting this option  type  causes  the  following  options  to  be
                     ignored: -B, -F.

                     number   type   is   ignored   in   Xref   and   JSON  output  formats.  Use
                     --_xformat="...%n" for Xref output format, or --fields=+n-P for JSON  output
                     format.

              pattern
                     Use  only search patterns for all tags, rather than the line numbers usually
                     used for macro definitions.  This  has  the  advantage  of  not  referencing
                     obsolete  line  numbers  when lines have been added or removed since the tag
                     file was generated.

              mixed  In this mode, patterns are generally used with a  few  exceptions.   For  C,
                     line  numbers  are used for macro definition tags. For Fortran, line numbers
                     are used for common blocks because  their  corresponding  source  lines  are
                     generally  identical,  making  pattern  searches  useless  for  finding  all
                     matches.

                     This was the  default  format  generated  by  the  original  ctags  and  is,
                     therefore, retained as the default for this option.

              combine
                     Concatenate the line number and pattern with a semicolon in between.

       -n     Equivalent to --excmd=number.

       -N     Equivalent to --excmd=pattern.

       --extras=[+|-][<flags>|*]
              Specifies  whether  to  include extra tag entries for certain kinds of information.
              See also "Extras" subsection to know what are extras.

              The parameter <flags> is a set of one-letter flags (and/or long-name  flags),  each
              representing  one  kind of extra tag entry to include in the tag file.  If flags is
              preceded by either the '+' or '-' character, the effect of each flag is  added  to,
              or  removed  from, those currently enabled; otherwise the flags replace any current
              settings. All entries are included  if '*' is given.

              This --extras= option is  for  controlling  extras  common  in  all  languages  (or
              language-independent  extras).   Universal  Ctags  also  supports language-specific
              extras.  (See  "Language-specific  fields  and  extras"  about  the  concept).  Use
              --extras-<LANG>= option for controlling them.

       --extras-(<LANG>|all)=[+|-][<flags>|*]
              Specifies whether to include extra tag entries for certain kinds of information for
              language <LANG>.  Universal  Ctags  introduces  language-specific  extras.  See  "‐
              Language-specific  fields  and  extras"  about  the  concept.  This  option  is for
              controlling them.

              Specifies all as <LANG> to apply the parameter <flags> to all languages; all extras
              are  enabled  with  specifying '*' as the parameter flags. If specifying nothing as
              the  parameter  flags  (--extras-all=),  all  extras  are   disabled.   These   two
              combinations are useful for testing.

              Check  the  output  of  the  --list-extras=<LANG> option for the extras of specific
              language <LANG>.

       --fields=[+|-][<flags>|*]
              Specifies which language-independent fields are to be included in the tag  entries.
              Language-independent fields are extension fields which are common in all languages.
              See "TAG FILE FORMAT" section, and "Extension fields" subsection,  for  details  of
              extension fields.

              The  parameter <flags> is a set of one-letter or long-name flags, each representing
              one type of extension field to include.   Each  flag  or  group  of  flags  may  be
              preceded  by  either '+' to add it to the default set, or '-' to exclude it. In the
              absence of any preceding '+' or '-' sign, only those fields  explicitly  listed  in
              flags  will be included in the output (i.e. overriding the default set). All fields
              are included if '*' is given.

              This option is ignored if the option --format=1 (legacy tag file format)  has  been
              specified.

              Use --fields-<LANG>= option for controlling language-specific fields.

       --fields-(<LANG>|all)=[+|-][<flags>|*]
              Specifies  which  language-specific  fields  are to be included in the tag entries.
              Universal Ctags supports language-specific fields. (See  "Language-specific  fields
              and extras" about the concept).

              Specify  all  as <LANG> to apply the parameter <flags> to all languages; all fields
              are enabled with specifying '*' as the parameter flags. If  specifying  nothing  as
              the  parameter  <flags>  (i.e.  --fields-all=),  all fields are disabled. These two
              combinations are useful for testing.

              See the description of --fields=[+|-][<flags>|*] about <flags>.

              Use --fields= option for controlling language-independent fields.

       --kinds-(<LANG>|all)=[+|-](<kinds>|*)
              Specifies a list of language-specific <kinds> of tags (or kinds) to include in  the
              output  file for a particular language, where <LANG> is case-insensitive and is one
              of the built-in language names (see the  --list-languages  option  for  a  complete
              list).

              The parameter <kinds> is a group of one-letter or long-name flags designating kinds
              of tags (particular to the language) to either include or exclude from the  output.
              The  specific  sets  of  flags  recognized  for  each  language, their meanings and
              defaults may be list using the --list-kinds-full option.

              Each letter or group of letters may be preceded by either '+' to add it to, or  '-'
              to  remove  it  from,  the  default set. In the absence of any preceding '+' or '-'
              sign, only those kinds explicitly listed in kinds will be included  in  the  output
              (i.e. overriding the default for the specified language).

              Specify  '*'  as  the  parameter  to include all kinds implemented in <LANG> in the
              output. Furthermore if all is given as <LANG>, specification of the parameter kinds
              affects all languages defined in ctags. Giving all makes sense only when '*' or 'F'
              is given as the parameter kinds.

              As an example for the C language, in order to add prototypes and external  variable
              declarations   to   the   default  set  of  tag  kinds,  but  exclude  macros,  use
              --kinds-c=+px-d; to include only tags for functions, use --kinds-c=f.

              Some kinds of C and C++ languages are synchronized; enabling (or disabling) a  kind
              in  one  language  enables the kind having the same one-letter and long-name in the
              other language. See also the description of MASTER column of --list-kinds-full.

       --pattern-length-limit=<N>
              Truncate patterns of tag entries after <N> characters.  Disable  by  setting  to  0
              (default is 96).

              An input source file with long lines and multiple tag matches per line can generate
              an excessively large tags file with an unconstrained pattern length.  For  example,
              running ctags on a minified JavaScript source file often exhibits this behavior.

              The truncation avoids cutting in the middle of a UTF-8 code point spanning multiple
              bytes to prevent writing invalid  byte  sequences  from  valid  input  files.  This
              handling  allows  for an extra 3 bytes above the configured limit in the worse case
              of a 4 byte code point starting right before the limit. Please also note that  this
              handling  is fairly naive and fast, and although it is resistant against any input,
              it requires a valid input to work properly; it is not guaranteed  to  work  as  the
              user  expects when dealing with partially invalid UTF-8 input.  This also partially
              affect non-UTF-8 input, if the byte sequence at the truncation length looks like  a
              multibyte  UTF-8  sequence. This should however be rare, and in the worse case will
              lead to including up to an extra 3 bytes above the limit.

       --pseudo-tags=[+|-](<pseudo-tag>|*)
              Enable/disable  emitting  pseudo-tag  named  <pseudo-tag>.   If   '*'   is   given,
              enable/disable emitting all pseudo-tags.

       --put-field-prefix
              Put UCTAGS as prefix for the name of fields newly introduced in Universal Ctags.

              Some  fields are newly introduced in Universal Ctags and more will be introduced in
              the future. Other tags generators may also introduce their specific fields.

              In such a situation, there is a concern about conflicting field names; mixing  tags
              files generated by multiple tags generators including Universal Ctags is difficult.
              This option provides a workaround for such station.

                 $ ctags --fields='{line}{end}' -o - hello.c
                 main    hello.c /^main(int argc, char **argv)$/;"       f       line:3  end:6
                 $ ctags --put-field-prefix --fields='{line}{end}' -o - hello.c
                 main    hello.c /^main(int argc, char **argv)$/;"       f       line:3  UCTAGSend:6

              In the above example, the prefix is put to end field which is newly  introduced  in
              Universal Ctags.

       --roles-(<LANG>|all).(<kind>|all)=[+|-][<roles>|*]
              Specifies a list of kind-specific roles of tags to include in the output file for a
              particular language.  <kind> specifies the kind  where  the  <roles>  are  defined.
              <LANG> specifies the language where the kind is defined.  Each role in <roles> must
              be surrounded by braces (e.g. {system} for a role named "system").

              Like --kinds-<LANG> option, '+' is for adding the role to the list, and '-' is  for
              removing  from  the  list.  '*' is for including all roles of the kind to the list.
              The option with no argument makes the list empty.

              Both a one-letter flag or a long name flag surrounded by braces are acceptable  for
              specifying       a       kind       (e.g.      --roles-C.h=+{system}{local}      or
              --roles-C.{header}=+{system}{local}).   '*'  can  be  used  for  <KIND>  only   for
              adding/removing  all  roles  of  all  kinds  in  a  language to/from the list (e.g.
              --roles-C.*=* or --roles-C.*=).

              all can be used for <LANG> only for adding/removing all roles of all kinds  in  all
              languages to/from the list (e.g.  --roles-all.*=* or --roles-all.*=).

       --tag-relative=(yes|no|always|never)
              Specifies  how  the  file  paths recorded in the tag file.  The default is yes when
              running in etags mode (see the -e option), no otherwise.

              yes    indicates that the file paths recorded in the tag file should be relative to
                     the  directory  containing  the  tag  file  unless the files supplied on the
                     command line are specified with absolute paths.

              no     indicates that the file paths recorded in the tag file should be relative to
                     the  current  directory  unless  the  files supplied on the command line are
                     specified with absolute paths.

              always indicates the recorded file paths should be relative  even  if  source  file
                     names are passed in with absolute paths.

              never  indicates  the  recorded  file  paths should be absolute even if source file
                     names are passed in with relative paths.

       --use-slash-as-filename-separator[=(yes|no)]
              Uses slash ('/') character  as  filename  separators  instead  of  backslash  ('\')
              character when printing input: field.  The default is yes for the default "u-ctags"
              output format, and no for the other formats.

              This option is available on MS Windows only.

       -B     Use backward searching patterns (e.g. ?pattern?). [Ignored in etags mode]

       -F     Use forward searching patterns (e.g. /pattern/) (default). [Ignored in etags mode]

   Option File Options
       --options=<pathname>
              Read additional options from file or directory.

              ctags searches <pathname> in the optlib path list first. If  ctags  cannot  find  a
              file  or  directory  in  the list, ctags reads a file or directory at the specified
              <pathname>.

              If a file is specified, it should contain one option per line. If  a  directory  is
              specified, files suffixed with .ctags under it are read in alphabetical order.

              As  a  special  case,  if  --options=NONE  is  specified as the first option on the
              command line, preloading is disabled; the option will disable the automatic reading
              of any configuration options from a file (see "FILES").

       --options-maybe=<pathname>
              Same  as --options but doesn't cause an error if file (or directory) specified with
              <pathname> doesn't exist.

       --optlib-dir=[+]<directory>
              Add an optlib <directory> to or reset the optlib path list.  By default, the optlib
              path list is empty.

   optlib Options
       See ctags-optlib(7) for details of each option.

       --kinddef-<LANG>=<letter>,<name>,<description>
              Define a kind for <LANG>.  Don't be confused this with --kinds-<LANG>.

       --langdef=<name>
              Defines a new user-defined language, <name>, to be parsed with regular expressions.

       --mline-regex-<LANG>=/<line_pattern>/<name_pattern>/<kind-spec>/[<flags>]
              Define multi-line regular expression for locating tags in specific language.

       --regex-<LANG>=/<line_pattern>/<name_pattern>/<kind-spec>/[<flags>]
              Define single-line regular expression for locating tags in specific language.

   Language Specific Options
       --if0[=(yes|no)]
              Indicates  a  preference  as  to  whether  code  within  an  "#if  0"  branch  of a
              preprocessor conditional should be examined for  non-macro  tags  (macro  tags  are
              always  included).  Because  the  intent  of this construct is to disable code, the
              default value of this option is no (disabled).

              Note that this indicates a preference only and does  not  guarantee  skipping  code
              within  an "#if 0" branch, since the fall-back algorithm used to generate tags when
              preprocessor conditionals are too complex follows all branches of a conditional.

       --line-directives[=(yes|no)]
              Specifies whether #line directives should be recognized. These are present  in  the
              output  of  a preprocessor and contain the line number, and possibly the file name,
              of the original  source  file(s)  from  which  the  preprocessor  output  file  was
              generated. This option is off by default.

              When  enabled, this option will cause ctags to generate tag entries marked with the
              file names and line numbers of their locations original source file(s), instead  of
              their  actual  locations  in  the preprocessor output. The actual file names placed
              into the tag file will have the same leading path components  as  the  preprocessor
              output  file,  since  it  is  assumed  that  the  original source files are located
              relative to the preprocessor output file (unless, of course,  the  #line  directive
              specifies an absolute path).

              Note:   This   option  is  generally  only  useful  when  used  together  with  the
              --excmd=number (-n) option.  Also, you may have to  use  either  the  --langmap  or
              --language-force  option  if  the  extension of the preprocessor output file is not
              known to ctags.

       -D <macro>=<definition>
              Defines a C preprocessor <macro>. This emulates the behavior of  the  corresponding
              gcc  option.  All types of macros are supported, including the ones with parameters
              and  variable  arguments.   Stringification,  token  pasting  and  recursive  macro
              expansion are also supported.  This extends the function provided by -I option.

       -h (<list>|default)
              Specifies  a  <list>  of  file  extensions,  separated  by periods, which are to be
              interpreted as include (or header) files. To indicate files  having  no  extension,
              use a period not followed by a non-period character (e.g. '.', ..x, .x.).

              This  option  only  affects  how  the  scoping  of  particular  kinds  of  tags are
              interpreted (i.e. whether or not they are considered as globally visible or visible
              only  within  the file in which they are defined); it does not map the extension to
              any particular language. Any tag which is located in a non-include file and  cannot
              be seen (e.g. linked to) from another file is considered to have file-limited (e.g.
              static) scope. No kind of tag appearing in an include file will  be  considered  to
              have file-limited scope.

              If  the first character in the list is '+', then the extensions in the list will be
              appended to the current list; otherwise, the list will replace  the  current  list.
              See, also, the fileScope/F flag of --extras option.

              The  default  list  is  .h.H.hh.hpp.hxx.h++.inc.def.  To  restore the default list,
              specify "-h default".

              Note that if an extension supplied to this  option  is  not  already  mapped  to  a
              particular language (see "Determining file language", above), you will also need to
              use either the --map-<LANG>, --langmap or --language-force option.

       -I <identifier-list>
              Specifies a <identifier-list> of identifiers which  are  to  be  specially  handled
              while  parsing  C  and  C++  source  files. This option is specifically provided to
              handle special cases arising through the use  of  preprocessor  macros.   When  the
              identifiers listed are simple identifiers, these identifiers will be ignored during
              parsing of the source files.

              If an identifier is suffixed with a '+' character (i.e. "-I FOO+"), ctags will also
              ignore  any  parenthesis-enclosed  argument  list  which may immediately follow the
              identifier in the source files. See the example of "-I MODULE_VERSION+" below.

              If two identifiers are separated with the '='  character  (i.e.  -I  FOO=BAR),  the
              first  identifiers  is replaced by the second identifiers for parsing purposes. The
              list of identifiers may be supplied directly on the command line or read in from  a
              separate file.  See the example of "-I CLASS=class" below.

              If  the  first  character  of <identifier-list> is '@', '.' or a pathname separator
              ('/' or '\'), or the first two characters specify a drive  letter  (e.g.  C:),  the
              parameter  <identifier-list> will be interpreted as a filename from which to read a
              list of identifiers, one per input line.

              Otherwise, <identifier-list> is a list of identifiers (or identifier pairs)  to  be
              specially  handled,  each  delimited  by either a comma or by white space (in which
              case the list should be quoted  to  keep  the  entire  list  as  one  command  line
              argument).

              Multiple  -I  options  may  be  supplied.  To clear the list of ignore identifiers,
              supply a single dash ('-') for <identifier-list>.

              This feature is useful when preprocessor macros are used in such a  way  that  they
              cause  syntactic  confusion  due to their presence. Indeed, this is the best way of
              working around a number of problems caused by the presence of syntax-busting macros
              in source files (see "CAVEATS").  Some examples will illustrate this point.

                 int foo ARGDECL4(void *, ptr, long int, nbytes)

              In  the above example, the macro ARGDECL4 would be mistakenly interpreted to be the
              name of the function instead of the correct name of foo. Specifying  "-I  ARGDECL4"
              results in the correct behavior.

                 /* creates an RCS version string in module */
                 MODULE_VERSION("$Revision$")

              In the above example the macro invocation looks too much like a function definition
              because it is not followed by a semicolon (indeed, it could even be followed  by  a
              global variable definition that would look much like a K&R style function parameter
              declaration). In fact, this seeming function definition could possibly  even  cause
              the  rest  of  the file to be skipped over while trying to complete the definition.
              Specifying "-I MODULE_VERSION+" would avoid such a problem.

                 CLASS Example {
                         // your content here
                 };

              The example above uses CLASS as a preprocessor macro  which  expands  to  something
              different   for  each  platform.  For  instance  CLASS  may  be  defined  as  class
              __declspec(dllexport) on Win32 platforms and simply class on  UNIX.  Normally,  the
              absence  of  the  C++  keyword  class would cause the source file to be incorrectly
              parsed. Correct behavior can be restored by specifying "-I CLASS=class".

       --param-<LANG>:<name>=<argument>
              Set a <LANG> specific parameter, a parameter specific to the <LANG>.

              Available parameters can be listed with --list-params.

   Listing Options
       --list-aliases[=(<language>|all)]
              Lists the aliases for either the specified <language> or all  languages,  and  then
              exits.   all  is  used  as  default  value  if the option argument is omitted.  The
              aliases are used when heuristically testing a language parser for a source file.

       --list-excludes
              Lists the current exclusion patterns used to exclude files.

       --list-extras[=(<language>|all)]
              Lists the extras recognized for either the specified <language> or  all  languages.
              See  "Extras"  subsection to know what are extras.  all is used as default value if
              the option argument is omitted.

              An extra can be enabled or  disabled  with  --extras=  for  common  extras  in  all
              languages,  or  --extras-<LANG>=  for  the  specified language.  These option takes
              one-letter flag or long-name flag as a parameter for specifying an extra.

              The meaning of columns in output are as follows:

              LETTER One-letter flag. '-' means the extra does not have one-letter flag.

              NAME   Long-name flag. The long-name is used in extras field.

              ENABLED
                     Whether the extra is enabled or not. It takes yes or no.

              LANGUAGE
                     The name of language if the extra is owned by  a  parser.   NONE  means  the
                     extra is common in parsers.

              DESCRIPTION
                     Human readable description for the extra.

       --list-features
              Lists the compiled features.

       --list-fields[=(<language>|all)]
              Lists  the  fields recognized for either the specified <language> or all languages.
              See "Extension fields" subsection to know what are fields.  all is used as  default
              value if the option argument is omitted.

              The meaning of columns are as follows:

              LETTER One-letter flag. '-' means the field does not have one-letter flag.

              NAME   Long-name of field.

              ENABLED
                     Whether the field is enabled or not. It takes yes or no.

              LANGUAGE
                     The name of language if the field is owned by a parser.  NONE means that the
                     field is a language-independent field which is common in all languages.

              JSTYPE JSON type used in printing the value of field when  --output-format=json  is
                     specified. See ctags-client-tools(7).

              FIXED  Whether this field can be disabled or not in tags output.

                     Some  fields  are printed always in tags output.  They have yes as the value
                     for this column.

                     Unlike the tag output mode, JSON output mode allows disabling any fields.

              OP     How this field can be accessed from  optscript  code.   This  field  is  for
                     Universal Ctags developers.

              DESCRIPTION
                     Human readable description for the field.

       --list-kinds[=(<language>|all)]
              Subset  of  --list-kinds-full.  This option is kept for backward-compatibility with
              Exuberant Ctags.

              This  option   prints   only   LETTER,   DESCRIPTION,   and   ENABLED   fields   of
              --list-kinds-full  output. However, the presentation of ENABLED column is different
              from that of --list-kinds-full option; [off] follows after description if the  kind
              is  disabled, and nothing follows     if enabled. The most of all kinds are enabled
              by default.

              The critical weakness of this option is that this option does not print the name of
              kind.  Universal Ctags introduces --list-kinds-full because it considers that names
              are important.

              This option does not work with --machinable nor --with-list-header.

       --list-kinds-full[=(<language>|all)]
              Lists the  tag  kinds  recognized  for  either  the  specified  <language>  or  all
              languages,  and then exits. See "Kinds" subsection to learn what kinds are.  all is
              used as default value if the option argument is omitted.

              Each kind of tag recorded in the tag file is represented by a one-letter flag, or a
              long-name  flag.  They  are  also  used  to  filter the tags placed into the output
              through use of the --kinds-<LANG> option.

              The meaning of columns are as follows:

              LANGUAGE
                     The name of language having the kind.

              LETTER One-letter flag. This must be unique in a language.

              NAME   The long-name flag of the kind. This can be used as the alternative  to  the
                     one-letter flag described above. If enabling K field with --fields=+K, ctags
                     uses long-names instead of one-letters in tags output. To  enable/disable  a
                     kind  with  --kinds-<LANG> option, long-name surrounded by braces instead of
                     one-letter. See "Letters and names" for details. This must be  unique  in  a
                     language.

              ENABLED
                     Whether the kind is enabled or not. It takes yes or no.

              REFONLY
                     Whether the kind is specialized for reference tagging or not.  If the column
                     is yes, the kind is  for  reference  tagging,  and  it  is  never  used  for
                     definition tagging. See also "TAG ENTRIES".

              NROLES The number of roles this kind has. See also "Roles".

              MASTER The  master  parser controlling enablement of the kind.  A kind belongs to a
                     language (owner) in Universal Ctags; enabling and  disabling  a  kind  in  a
                     language  has no effect on a kind in another language even if both kinds has
                     the same one-letter flag and/or the same long-name flag. In other words, the
                     namespace of kinds are separated by language.

                     However,  Exuberant  Ctags  does  not  separate  the  kinds  of  C  and C++.
                     Enabling/disabling kindX in  C  language  enables/disables  a  kind  in  C++
                     language having the same long-name flag with kindX. To emulate this behavior
                     in  Universal  Ctags,  a  concept  named  master   parser   is   introduced.
                     Enabling/disabling some kinds are synchronized under the control of a master
                     language.

                        $ ctags --kinds-C=+'{local}' --list-kinds-full \
                          | grep -E '^(#|C\+\+ .* local)'
                        #LANGUAGE  LETTER NAME   ENABLED REFONLY NROLES MASTER DESCRIPTION
                        C++        l      local  yes     no      0      C      local variables
                        $ ctags --kinds-C=-'{local}' --list-kinds-full \
                          | grep -E '^(#|C\+\+ .* local)'
                        #LANGUAGE  LETTER NAME   ENABLED REFONLY NROLES MASTER DESCRIPTION
                        C++        l      local  no      no      0      C      local variables

                     You see ENABLED field of local kind of C++ language is changed Though  local
                     kind  of  C language is enabled/disabled. If you swap the languages, you see
                     the same result.

              DESCRIPTION
                     Human readable description for the kind.

       --list-languages
              Lists the names of the  languages  understood  by  ctags,  and  then  exits.  These
              language  names  are  case  insensitive  and may be used in many other options like
              --language-force, --languages, --kinds-<LANG>, --regex-<LANG>, and so on.

              Each language listed is disabled if followed by [disabled].  To use the parser  for
              such a language, specify the language as an argument of --languages=+ option.

              --machinable  and --with-list-header options are ignored if they are specified with
              this option.

       --list-map-extensions[=(<language>|all)]
              Lists the file extensions which associate a file name with a  language  for  either
              the  specified <language> or all languages, and then exits.  all is used as default
              value if the option argument is omitted.

       --list-map-patterns[=(<language>|all)]
              Lists the file name patterns which associate a file name with a language for either
              the  specified <language> or all languages, and then exits.  all is used as default
              value if the option argument is omitted.

       --list-maps[=(<language>|all)]
              Lists file name patterns and the file extensions which associate a file name with a
              language for either the specified <language> or all languages, and then exits.  all
              is used as default value if the option argument is omitted.

              To  list  the  file  extensions   or   file   name   patterns   individually,   use
              --list-map-extensions or --list-map-patterns option.  See the --langmap option, and
              "Determining file language", above.

              This option does not work with --machinable nor --with-list-header.

       --list-mline-regex-flags
              Output list of flags which can be used in a multiline regex parser definition.  See
              ctags-optlib(7).

       --list-params[=(<language>|all)]
              Lists the parameters for either the specified <language> or all languages, and then
              exits.  all is used as default value if the option argument is omitted.

       --list-pseudo-tags
              Output list of pseudo-tags.

       --list-regex-flags
              Lists the flags that can be used in --regex-<LANG> option.  See ctags-optlib(7).

       --list-roles[=(<language>|all)[.(<kind-specs>|*)]]
              List the roles for either the specified <language> or all languages.  all  is  used
              as default value if the option argument is omitted.

              If  the  parameter  <kindspecs> is given after the parameter <language> or all with
              concatenating with '.', list only roles defined in the kinds. Both one-letter flags
              and  long  name  flags  surrounded  by  braces  are  acceptable  as  the  parameter
              <kindspecs>.

              The meaning of columns are as follows:

              LANGUAGE
                     The name of language having the role.

              KIND(L/N)
                     The one-letter flag and the long-name flag of kind having the role.

              NAME   The long-name flag of the role.

              ENABLED
                     Whether the kind is enabled or not. It takes yes or no.

              DESCRIPTION
                     Human readable description for the role.

       --list-subparsers[=(<baselang>|all)]
              Lists the subparsers for a base language for either the specified <baselang> or all
              languages,  and then exits.  all is used as default value if the option argument is
              omitted.

       --machinable[=(yes|no)]
              Use tab character as separators for --list- option output.  It may be suitable  for
              scripting. See "List options" for considered use cases. Disabled by default.

       --with-list-header[=(yes|no)]
              Print  headers  describing  columns  in  --list-  option  output.   See  also "List
              options".

   Miscellaneous Options
       --help Prints to standard output a detailed usage description, and then exits.

       -?     Equivalent to --help.

       --help-full
              Prints to standard output  a  detailed  usage  description  including  experimental
              features,  and  then  exits. Visit https://docs.ctags.io/ for information about the
              latest exciting experimental features.

       --license
              Prints a summary of the software license to standard output, and then exits.

       --print-language
              Just prints the language parsers for specified source files, and then exits.

       --quiet[=(yes|no)]
              Write fewer messages (default is no).

       --totals[=(yes|no|extra)]
              Prints statistics about the source files read and the tag file written  during  the
              current invocation of ctags. This option is no by default.

              The  extra  value  prints  parser  specific  statistics  for parsers gathering such
              information.

       --verbose[=(yes|no)]
              Enable verbose mode. This prints out information on option processing and  a  brief
              message  describing  what  action is being taken for each file considered by ctags.
              Normally, ctags does not read command line arguments until after options  are  read
              from  the configuration files (see "FILES", below).  However, if this option is the
              first argument on the command line, it will take effect before any options are read
              from these sources. The default is no.

       -V     Equivalent to --verbose.

       --version
              Prints  a  version identifier for ctags to standard output, and then exits. This is
              guaranteed to always contain the string "Universal Ctags".

   Obsoleted Options
       These options are kept for backward-compatibility with Exuberant Ctags.

       -w     This option is silently ignored for backward-compatibility with the ctags  of  SVR4
              Unix.

       --file-scope[=(yes|no)]
              This options is removed. Use --extras=[+|-]F or --extras=[+|-]{fileScope} instead.

       --extra=[+|-][<flags>|*]
              Equivalent  to  --extras=[+|-][<flags>|*],  which was introduced to make the option
              naming convention align to the other options like --kinds-<LANG>= and --fields=.

       --<LANG>-kinds=[+|-](<kinds>|*)
              This option is obsolete. Use --kinds-<LANG>=... instead.

OPERATIONAL DETAILS

       As ctags considers each source file name in turn, it tries to determine  the  language  of
       the file by applying tests described in "Determining file language".

       If  a language was identified, the file is opened and then the appropriate language parser
       is called to operate on the currently open file. The parser parses through  the  file  and
       adds  an  entry to the tag file for each language object it is written to handle. See "TAG
       FILE FORMAT", below, for details on these entries.

   Notes for C/C++ Parser
       This implementation of ctags imposes no formatting requirements on C  code  as  do  legacy
       implementations.  Older  implementations  of  ctags tended to rely upon certain formatting
       assumptions  in  order  to  help  it  resolve  coding  dilemmas  caused  by   preprocessor
       conditionals.

       In  general,  ctags  tries  to  be  smart  about conditional preprocessor directives. If a
       preprocessor conditional is encountered within a statement  which  defines  a  tag,  ctags
       follows only the first branch of that conditional (except in the special case of #if 0, in
       which case it follows only the last branch). The reason for this is that failing to pursue
       only one branch can result in ambiguous syntax, as in the following example:

          #ifdef TWO_ALTERNATIVES
          struct {
          #else
          union {
          #endif
                  short a;
                  long b;
          }

       Both branches cannot be followed, or braces become unbalanced and ctags would be unable to
       make sense of the syntax.

       If the application of this heuristic fails to properly parse  a  file,  generally  due  to
       complicated  and  inconsistent  pairing within the conditionals, ctags will retry the file
       using a different heuristic which does not  selectively  follow  conditional  preprocessor
       branches,  but  instead  falls  back  to relying upon a closing brace ('}') in column 1 as
       indicating the end of a block once any  brace  imbalance  results  from  following  a  #if
       conditional branch.

       ctags  will  also  try  to  specially  handle  arguments  lists enclosed in double sets of
       parentheses in order to accept the following conditional construct:

          extern void foo __ARGS((int one, char two));

       Any name immediately preceding the '((' will be automatically  ignored  and  the  previous
       name will be used.

       C++ operator definitions are specially handled. In order for consistency with all types of
       operators (overloaded and conversion), the operator name in the tag file  will  always  be
       preceded  by  the  string  "operator  "  (i.e.  even if the actual operator definition was
       written as "operator<<").

       After creating or appending to the tag file, it  is  sorted  by  the  tag  name,  removing
       identical tag lines.

   Determining file language
   File name mapping
       Unless  the  --language-force  option  is  specified,  the language of each source file is
       automatically selected based upon a mapping of file names to languages.  The  mappings  in
       effect  for each language may be displayed using the --list-maps option and may be changed
       using the --langmap or --map-<LANG> options.

       If the name of a file is not mapped to a language, ctags tries to heuristically guess  the
       language for the file by inspecting its content.

       All  files  that have no file name mapping and no guessed parser are ignored. This permits
       running ctags on all files in either a single directory (e.g.  "ctags *"), or on all files
       in  an  entire source directory tree (e.g. "ctags -R"), since only those files whose names
       are mapped to languages will be scanned.

       An extension may be mapped to multiple parsers. For example, .h are mapped to C++,  C  and
       ObjectiveC.  These  mappings can cause issues. ctags tries to select the proper parser for
       the source file by applying heuristics to its content, however it is not perfect.  In case
       of  issues  one  can use --language-force=<language>, --langmap=<map>[,<map>[...]], or the
       --map-<LANG>=[+|-]<extension>|<pattern> options.  (Some  of  the  heuristics  are  applied
       whether --guess-language-eagerly is given or not.)

   Heuristically guessing
       If  ctags  cannot  select a parser from the mapping of file names, various heuristic tests
       are conducted to determine the language:

       template file name testing
              If the file name has an .in extension, ctags applies the mapping to the  file  name
              without   the  extension.  For  example,  config.h  is  tested  for  a  file  named
              config.h.in.

       interpreter testing
              The first line of the file is checked to see if the file is  a  #!   script  for  a
              recognized language. ctags looks for a parser having the same name.

              If  ctags  finds  no  such  parser,  ctags  looks  for the name in alias lists. For
              example, consider if the first line is  #!/bin/sh.   Though  ctags  has  a  "shell"
              parser, it doesn't have a "sh" parser. However, sh is listed as an alias for shell,
              therefore ctags selects the "shell" parser for the file.

              An exception is env. If env is specified  (for  example  "#!/usr/bin/env  python"),
              ctags reads more lines to find real interpreter specification.

              To  display  the list of aliases, use --list-aliases option.  To add an item to the
              list or to remove an item from  the  list,  use  the  --alias-<LANG>=+<pattern>  or
              --alias-<LANG>=-<pattern> option respectively.

       zsh autoload tag testing
              If  the  first  line  starts  with #compdef or #autoload, ctags regards the line as
              "zsh".

       emacs mode at the first line testing
              The Emacs editor has multiple editing modes specialized for programming  languages.
              Emacs  can  recognize a marker called modeline in a file and utilize the marker for
              the mode selection. This heuristic test does the same as what Emacs does.

              ctags treats  MODE  as  a  name  of  interpreter  and  applies  the  same  rule  of
              "interpreter" testing if the first line has one of the following patterns:

                 -*- mode: MODE -*-

              or

                 -*- MODE -*-

       emacs mode at the EOF testing
              Emacs editor recognizes another marker at the end of file as a mode specifier. This
              heuristic test does the same as what Emacs does.

              ctags treats MODE as a name  of  an  interpreter  and  applies  the  same  rule  of
              "interpreter"  heuristic  testing,  if  the  lines at the tail of the file have the
              following pattern:

                 Local Variables:
                 ...
                 mode: MODE
                 ...
                 End:

              3000 characters are sought from the end of file to find the pattern.

       vim modeline testing
              Like the modeline of the Emacs editor, Vim editor  has  the  same  concept.   ctags
              treats  TYPE  as  a  name of interpreter and applies the same rule of "interpreter"
              heuristic testing if the last 5 lines  of  the  file  have  one  of  the  following
              patterns:

                 filetype=TYPE

              or

                 ft=TYPE

       PHP marker testing
              If the first line is started with <?php, ctags regards the line as "php".

       Looking  into  the file contents is a more expensive operation than file name matching. So
       ctags runs the testings in limited conditions.  "interpreter" testing is enabled only when
       a file is an executable or the --guess-language-eagerly (-G in short) option is given. The
       other heuristic tests are enabled only when -G option is given.

       The --print-language option can be used just to print the results of parser selections for
       given files instead of generating a tags file.

       Examples:

          $ ctags --print-language config.h.in input.m input.unknown
          config.h.in: C++
          input.m: MatLab
          input.unknown: NONE

       NONE means that ctags does not select any parser for the file.

TAG FILE FORMAT

       This section describes the tag file format briefly.  See tags(5) and ctags-client-tools(7)
       for more details.

       When not running in etags mode, each entry in the tag file consists of  a  separate  line,
       each looking like this, called regular tags, in the most general case:

          <tag_name><TAB><file_name><TAB><ex_cmd>;"<TAB><extension_fields>

       The fields and separators of these lines are specified as follows:

          1. <tag_name>: tag name

          2. <TAB>: single tab character

          3. <file_name>: name of the file in which the object associated with the tag is located

          4. <TAB>: single tab character

          5. <ex_cmd>:  EX  command  used  to  locate the tag within the file; generally a search
             pattern (either /pattern/ or ?pattern?) or line number (see --excmd=<type> option).

          6. ;"<TAB><extension_fields>: a set of extension fields.  See  "Extension  fields"  for
             more details.

             Tag  file  format  2  (see --format) extends the EX command to include the extension
             fields embedded in an EX comment immediately  appended  to  the  EX  command,  which
             leaves it backward-compatible with original vi(1) implementations.

       A  few  special  tags,  called  pseudo  tags,  are  written into the tag file for internal
       purposes.

          !_TAG_FILE_FORMAT       2       /extended format; --format=1 will not append ;" to lines/
          !_TAG_FILE_SORTED       1       /0=unsorted, 1=sorted, 2=foldcase/
          ...

       --pseudo-tags=[+|-](<pseudo-tag>|*) option enables or disables emitting pseudo-tags.

       See the output of "ctags --list-pseudo-tags" for the list of the kinds.  See also  tags(5)
       and ctags-client-tools(7) for more details of the pseudo tags.

       These  tags  are  composed  in  such  a  way that they always sort to the top of the file.
       Therefore, the first two characters of these tags are used a magic number to detect a  tag
       file for purposes of determining whether a valid tag file is being overwritten rather than
       a source file.

       Note that the name of each source file will be recorded in the  tag  file  exactly  as  it
       appears  on the command line. Therefore, if the path you specified on the command line was
       relative to the current directory, then it will be recorded in that same manner in the tag
       file.  See, however, the --tag-relative=(yes|no|always|never) option for how this behavior
       can be modified.

TAG ENTRIES

       A tag is an index for a language object. The  concept  of  a  tag  and  related  items  in
       Exuberant Ctags are refined and extended in Universal Ctags.

       A  tag is categorized into definition tags or reference tags.  In general, Exuberant Ctags
       only tags definitions of language objects: places where newly named language  objects  are
       introduced.   Universal  Ctags,  on  the  other  hand, can also tag references of language
       objects: places where named language objects are used.  However,  support  for  generating
       reference  tags  is new and limited to specific areas of specific languages in the current
       version.

   Extension fields
       A tag can record various information, called extension fields.

       Extension fields are tab-separated key-value pairs appended to the end of the  EX  command
       as  a  comment,  as  described  above.  These  key  value pairs appear in the general form
       key:value.

       In addition, information on the scope of the tag definition may be available, with the key
       portion  equal  to  some language-dependent construct name and its value the name declared
       for that construct in the program.  This scope entry indicates the scope in which the  tag
       was  found.   For  example,  a  tag  generated for a C structure member would have a scope
       looking like struct:myStruct.

       --fields=[+|-][<flags>|*]  and  --fields-(<LANG>|all)=[+|-][<flags>|*]  options  specifies
       which available extension fields are to be included in the tag entries.

       See  the  output of "ctags --list-fields" for the list of extension fields.  The essential
       fields are name, input, pattern, and line.  The meaning of  major  fields  is  as  follows
       (long-name flag/one-letter flag):

       access/a
              Indicates  the  visibility  of  this  class  member, where value is specific to the
              language.

       end/e  Indicates the line number of the end lines of the language object.

       extras/E
              Extra tag type information. See "Extras" for details.

       file/f Indicates that the tag has file-limited visibility. This key has  no  corresponding
              value. Enabled by default.

       implementation/m
              When present, this indicates a limited implementation (abstract vs.  concrete) of a
              routine or class, where value is specific to the language (virtual or pure  virtual
              for C++; abstract for Java).

       inherits/i
              When  present,  value is a comma-separated list of classes from which this class is
              derived (i.e. inherits from).

       input/F
              The name of source file where name is defined or referenced.

       k      Kind of tag as one-letter. Enabled by default.  This field has no  long-name.   See
              also kind/z flag.

       K      Kind of tag as long-name.  This field has no long-name.  See also kind/z flag.

       kind/z Include the kind: key in kind field.  See also k and K flags.

       language/l
              Language of source file containing tag

       line/n The line number where name is defined or referenced in input.

       name/N The name of language objects.

       nth/o  The order in the parent scope.  (i.e. 4th parameter in the function).

       pattern/P
              Can be used to search the name in input

       roles/r
              Roles assigned to the tag. See "Roles" for more details.

       s      Scope  of  tag  definition.  Enabled by default.  This field has no long-name.  See
              also scope/Z flag.

       scope/Z
              Prepend the scope: key to scope (s) field.  See also s flag.

       scopeKind/p
              Kind of scope as long-name

       signature/S
              When present, value is a language-dependent representation of the  signature  of  a
              routine  (e.g.  prototype  or  parameter list). A routine signature in its complete
              form specifies the return type of a routine and its  formal  argument  list.   This
              extension  field  is  presently  supported  only for C-based languages and does not
              include the return type.

       typeref/t
              Type and name of a variable, typedef, or return type of callable like  function  as
              typeref: field.  Enabled by default.

   Kinds
       kind  is  a  field  which represents the kind of language object specified by a tag. Kinds
       used and defined are very different between  parsers.  For  example,  C  language  defines
       macro, function, variable, typedef, etc.

       --kinds-(<LANG>|all)=[+|-](<kinds>|*)  option  specifies a list of language-specific kinds
       of tags (or kinds) to include in the output file for a particular language.

       See the output of "ctags --list-kinds-full" for the complete list of the kinds.

       Its value is either one of the corresponding one-letter flags or a long-name flag.  It  is
       permitted  (and is, in fact, the default) for the key portion of this field to be omitted.
       The optional behaviors are controlled with the --fields option as follows.

          $ ctags -o - kinds.c
          foo     kinds.c /^int foo() {$/;"       f       typeref:typename:int
          $ ctags --fields=+k -o - kinds.c
          foo     kinds.c /^int foo() {$/;"       f       typeref:typename:int
          $ ctags --fields=+K -o - kinds.c
          foo     kinds.c /^int foo() {$/;"       function        typeref:typename:int
          $ ctags --fields=+z -o - kinds.c
          foo     kinds.c /^int foo() {$/;"       kind:f  typeref:typename:int
          $ ctags --fields=+zK -o - kinds.c
          foo     kinds.c /^int foo() {$/;"       kind:function   typeref:typename:int

   Roles
       Role is a newly introduced concept in Universal Ctags. Role is a concept  associated  with
       reference tags, and is not implemented widely yet.

       As  described previously in "Kinds", the kind field represents the type of language object
       specified with a tag, such as a function vs. a variable.  Specific kinds are  defined  for
       reference  tags,  such  as  the  C++ kind header for header file, or Java kind package for
       package statements. For such reference kinds, a roles field can be  added  to  distinguish
       the  role of the reference kind. In other words, the kind field identifies the what of the
       language object, whereas the roles field identifies  the  how  of  a  referenced  language
       object. Roles are only used with specific kinds.

       For a definition tag, this field takes def as a value.

       For  example,  Baz  is  tagged as a reference tag with kind package and with role imported
       with the following code.

          package Bar;
          import Baz;

          class Foo {
                          // ...
          }

          $ ctags --fields=+KEr -uo - roles.java
          Bar     roles.java     /^package Bar;$/;"      package roles:def
          Foo     roles.java     /^class Foo {$/;"       class   roles:def
          $ ctags --fields=+EKr --extras=+r -uo - roles.java
          Bar     roles.java     /^package Bar;$/;"      package roles:def
          Baz     roles.java     /^import Baz;$/;"       package roles:imported  extras:reference
          Foo     roles.java     /^class Foo {$/;"       class   roles:def

       --roles-(<LANG>|all).(<kind>|all)=[+|-][<roles>|*]   option   specifies    a    list    of
       kind-specific roles of tags to include in the output file for a particular language.

       Inquire the output of "ctags --list-roles" for the list of roles.

   Extras
       Generally,  ctags  tags  only  language objects appearing in source files, as is. In other
       words, a value for a name: field should be found on the source file  associated  with  the
       name:.  An  extra type tag (extra) is for tagging a language object with a processed name,
       or for tagging something not associated with a language object. A  typical  extra  tag  is
       qualified, which tags a language object with a class-qualified or scope-qualified name.

       --extras-(<LANG>|all)=[+|-][<flags>|*]  option  specifies  whether  to  include  extra tag
       entries for certain kinds of information.

       Inquire the output of ctags --list-extras for the list of extras.  The  meaning  of  major
       extras is as follows (long-name flag/one-letter flag):

       anonymous/none
              Include  an  entry  for  the language object that has no name like lambda function.
              This extra has no one-letter flag and is enabled by default.

              The extra tag is useful as a placeholder to fill scope fields for language  objects
              defined in a language object with no name.

                 struct {
                         double x, y;
                 } p = { .x = 0.0, .y = 0.0 };

              'x' and 'y' are the members of a structure. When filling the scope fields for them,
              ctags has trouble because the struct where 'x' and 'y' belong to has no  name.  For
              overcoming  the  trouble, ctags generates an anonymous extra tag for the struct and
              fills the scope fields with the name of the extra tag.

                 $ ctags --fields=-f -uo - input.c
                 __anon9f26d2460108      input.c /^struct {$/;"  s
                 x       input.c /^      double x, y;$/;"        m       struct:__anon9f26d2460108
                 y       input.c /^      double x, y;$/;"        m       struct:__anon9f26d2460108
                 p       input.c /^} p = { .x = 0.0, .y = 0.0 };$/;"     v       typeref:struct:__anon9f26d2460108

              The above tag output has __anon9f26d2460108 as an anonymous extra tag.  The typeref
              field of 'p' also receives the benefit of it.

       fileScope/F
              Indicates  whether  tags  scoped  only for a single file (i.e. tags which cannot be
              seen outside of the file in which they are defined, such as language  objects  with
              static  modifier  of  C language) should be included in the output. See also the -h
              option.

              This extra tag is enabled by default. Add --extras=-F option  not  to  output  tags
              scoped  only  for a single-file. This is the replacement for --file-scope option of
              Exuberant Ctags.

                 static int f() {
                         return 0;
                 }
                 int g() {
                         return 0;
                 }

                 $ ctags -uo - filescope.c
                 f       filescope.c     /^static int f() {$/;"  f       typeref:typename:int    file:
                 g       filescope.c     /^int g() {$/;" f       typeref:typename:int
                 $ ctags --extras=-F -uo - filescope.c
                 g       filescope.c     /^int g() {$/;" f       typeref:typename:int

       inputFile/f
              Include an entry for the base file name of  every  source  file  (e.g.  example.c),
              which  addresses  the  first  line  of  the file.  This flag is the replacement for
              --file-tags hidden option of Exuberant Ctags.

              If the end: field is enabled, the end line number of the file can  be  attached  to
              the  tag. (However, ctags omits the end: field if no newline is in the file like an
              empty file.)

              By default, ctags doesn't create the inputFile/f extra tag for the source file when
              ctags   doesn't   find   a   parser   for   it.   Enabling   Unknown   parser  with
              --languages=+Unknown forces ctags to create the extra tags for any source files.

              The etags mode enables the Unknown parser implicitly.

       pseudo/p
              Include pseudo-tags. Enabled by default unless the tag file is written to  standard
              output. See ctags-client-tools(7) about the detail of pseudo-tags.

       qualified/q
              Include  an  extra  class-qualified  or  namespace-qualified tag entry for each tag
              which is a member of a class or a namespace.

              This may allow easier location of a specific tags when multiple  occurrences  of  a
              tag  name  occur  in the tag file.  Note, however, that this could potentially more
              than double the size of the tag file.

              The actual form of the qualified tag depends upon the language from which  the  tag
              was  derived  (using  a  form  that  is  most  natural  for how qualified calls are
              specified in the language). For C++ and Perl, it is in the form class::member;  for
              Eiffel and Java, it is in the form class.member.

              Note:  Using  backslash  characters  as  separators  forming qualified name in PHP.
              However, in tags output of Universal Ctags, a backslash  character  in  a  name  is
              escaped with a backslash character. See tags(5) about the escaping.

              The following example demonstrates the qualified extra tag.

                 class point {
                         double x;
                 };

              For  the  above  source  file, ctags tags point and x by default.  If the qualified
              extra is enabled from the command line (--extras=+q), then point.x is  also  tagged
              even though the string "point.x" is not in the source code.

                 $ ctags --fields=+K -uo - qualified.java
                 point   qualified.java  /^class point {$/;"     class
                 x       qualified.java  /^      double x;$/;"   field   class:point
                 $ ctags --fields=+K --extras=+q -uo - qualified.java
                 point   qualified.java  /^class point {$/;"     class
                 x       qualified.java  /^      double x;$/;"   field   class:point
                 point.x qualified.java  /^      double x;$/;"   field   class:point

       reference/r
              Include reference tags. See "TAG ENTRIES" about reference tags.

              The following example demonstrates the reference extra tag.

                 #include <stdio.h>
                 #include "utils.h"
                 #define X
                 #undef X

              The  roles:system  or  roles:local  fields  will  be added depending on whether the
              include file name begins with '<' or not.

              "#define X" emits a definition tag. On the other hand "#undef X" emits a  reference
              tag.

                 $ ctags --fields=+EKr -uo - inc.c
                 X       inc.c   /^#define X$/;" macro   file:   roles:def       extras:fileScope
                 $ ctags --fields=+EKr --extras=+r -uo - inc.c
                 stdio.h inc.c   /^#include <stdio.h>/;" header  roles:system    extras:reference
                 utils.h inc.c   /^#include "utils.h"/;" header  roles:local     extras:reference
                 X       inc.c   /^#define X$/;" macro   file:   roles:def       extras:fileScope
                 X       inc.c   /^#undef X$/;"  macro   file:   roles:undef     extras:fileScope,reference

   Language-specific fields and extras
       Exuberant  Ctags  has the concept of fields and extras. They are common between parsers of
       different languages. Universal Ctags extends this concept by  providing  language-specific
       fields and extras.

HOW TO USE WITH VI

       vi(1)  will, by default, expect a tag file by the name tags in the current directory. Once
       the tag file is built, the following commands exercise the tag indexing feature:

       vi -t tag
              Start vi and position the cursor at the file and line where tag is defined.

       :ta tag
              Find a tag.

       Ctrl-] Find the tag under the cursor.

       Ctrl-T Return to previous location before jump to tag (not widely implemented).

HOW TO USE WITH GNU EMACS

       emacs(1) will, by default, expect a tag file by the name TAGS in  the  current  directory.
       Once the tag file is built, the following commands exercise the tag indexing feature:

       M-x visit-tags-table <RET> FILE <RET>
              Select the tag file, FILE, to use.

       M-. [TAG] <RET>
              Find  the  first  definition  of  TAG.  The default tag is the identifier under the
              cursor.

       M-*    Pop back to where you previously invoked M-..

       C-u M-.
              Find the next definition for the last tag.

       For more commands, see the Tags topic in the Emacs info document.

HOW TO USE WITH NEDIT

       NEdit version 5.1 and later can handle the new extended tag file format (see --format).

       · To make NEdit use the tag file, select "File->Load Tags File".

       · To jump to the definition for a tag, highlight the word, then press Ctrl-D.

       NEdit 5.1 can read multiple tag files from different directories. Setting the  X  resource
       nedit.tagFile  to  the  name  of a tag file instructs NEdit to automatically load that tag
       file at startup time.

CAVEATS

       Because ctags is neither a preprocessor nor a compiler, use  of  preprocessor  macros  can
       fool  ctags into either missing tags or improperly generating inappropriate tags. Although
       ctags has been designed to handle certain common cases, this is the single  biggest  cause
       of  reported  problems.  In particular, the use of preprocessor constructs which alter the
       textual syntax of C can fool ctags. You can work around many such problems by using the -I
       option.

       Note that since ctags generates patterns for locating tags (see the --excmd option), it is
       entirely possible that the wrong line may be found by your editor if there exists  another
       source  line  which  is  identical  to  the line containing the tag. The following example
       demonstrates this condition:

          int variable;

          /* ... */
          void foo(variable)
          int variable;
          {
                  /* ... */
          }

       Depending upon which editor you use and where in the code you happen to be, it is possible
       that  the  search  pattern  may locate the local parameter declaration before it finds the
       actual global variable definition, since the lines (and therefore their  search  patterns)
       are identical.

       This can be avoided by use of the --excmd=n option.

BUGS

       ctags has more options than ls(1).

       ctags assumes the input file is written in the correct grammar.  Otherwise output of ctags
       is undefined. In other words it has garbage in, garbage out (GIGO) feature.

       When parsing a C++ member function definition  (e.g.  className::function),  ctags  cannot
       determine  whether the scope specifier is a class name or a namespace specifier and always
       lists it as a class name in the scope portion of the extension  fields.  Also,  if  a  C++
       function  is  defined  outside  of  the  class  declaration  (the  usual case), the access
       specification (i.e. public, protected, or private) and  implementation  information  (e.g.
       virtual, pure virtual) contained in the function declaration are not known when the tag is
       generated for the function definition. It will, however be available for prototypes  (e.g.
       --kinds-c++=+p).

       No qualified tags are generated for language objects inherited into a class.

ENVIRONMENT VARIABLES

       TMPDIR On  Unix-like  hosts  where  mkstemp(3)  is  available,  the value of this variable
              specifies the directory in which to place temporary files.  This can be  useful  if
              the  size of a temporary file becomes too large to fit on the partition holding the
              default temporary directory defined at compilation time.

              ctags creates temporary files only if either (1) an emacs-style tag file  is  being
              generated,  (2)  the  tag file is being sent to standard output, or (3) the program
              was compiled to use an internal sort algorithm to sort the tag files instead of the
              sort(1)  utility  of the operating system.  If the sort(1) utility of the operating
              system is being used, it will generally observe this variable also.

              Note that if ctags is setuid, the value of TMPDIR will be ignored.

FILES

       tags   The default tag file created by ctags.

       TAGS   The default tag file created by etags.

       $XDG_CONFIG_HOME/ctags/*.ctags, or $HOME/.config/ctags/*.ctags if $XDG_CONFIG_HOME is  not
       defined (on other than MS Windows)

       $HOME/.ctags.d/*.ctags

       $HOMEDRIVE$HOMEPATH/ctags.d/*.ctags (on MS Windows only)

       .ctags.d/*.ctags

       ctags.d/*.ctags
          If  any  of  these configuration files exist, each will be expected to contain a set of
          default options which are read in the order listed when ctags starts,  but  before  any
          command  line  options  are  read.  This  makes  it  possible  to  set  up  personal or
          project-level defaults.

          It is possible to compile ctags to read an additional configuration file before any  of
          those  shown  above,  which  will  be indicated if the output produced by the --version
          option lists the custom-conf feature.

          Options appearing on the command line will override options specified in  these  files.
          Only options will be read from these files.

          Note  that  the  option  files  are  read  in  line-oriented  mode  in which spaces are
          significant (since shell quoting is not possible) but spaces at the beginning of a line
          are ignored. Each line of the file is read as one command line parameter (as if it were
          quoted with single quotes).  Therefore, use new lines to indicate separate command-line
          arguments.

          A line starting with '#' is treated as a comment.

          *.ctags files in a directory are loaded in alphabetical order.

SEE ALSO

       See ctags-optlib(7) for defining (or extending) a parser in a configuration file.

       See tags(5) for the format of tag files.

       See ctags-incompatibilities(7) about known incompatible changes with Exuberant Ctags.

       See  ctags-client-tools(7)  if  you  are  interested in writing a tool for processing tags
       files.

       See ctags-lang-python(7) about python input specific notes.

       See readtags(1) about a client tool for binary searching a name in a sorted tags file.

       The official Universal Ctags web site at: https://ctags.io/

       Also ex(1), vi(1), elvis(1), or, better yet, vim(1), the official editor  of  ctags.   For
       more information on vim(1), see the Vim web site at: https://www.vim.org/

AUTHOR

       Universal Ctags project https://ctags.io/

       Darren Hiebert <dhiebert@users.sourceforge.net> http://DarrenHiebert.com/

MOTIVATION

       "Think ye at all times of rendering some service to every member of the human race."

       "All effort and exertion put forth by man from the fullness of his heart is worship, if it
       is prompted by the highest motives and the will to do service to humanity."

       -- From the Baha'i Writings

CREDITS

       This  version  of  ctags  (Universal  Ctags)  derived  from  the  repository,   known   as
       fishman-ctags, started by Reza Jelveh.

       The fishman-ctags was derived from Exuberant Ctags.

       Some parsers are taken from tagmanager of the Geany (https://www.geany.org/) project.

       Exuberant  Ctags  was  originally  derived from and inspired by the ctags program by Steve
       Kirkendall <kirkenda@cs.pdx.edu> that comes with the Elvis vi clone (though virtually none
       of the original code remains).

       Credit  is  also  due Bram Moolenaar <Bram@vim.org>, the author of vim, who has devoted so
       much of his time and energy both to developing the editor as a service to others,  and  to
       helping the orphans of Uganda.

       The section entitled "HOW TO USE WITH GNU EMACS" was shamelessly stolen from the info page
       for GNU etags.