NAME

       texfot - run TeX, filtering online transcript for interesting messages

SYNOPSIS

       texfot [option]... texcmd [texarg...]

DESCRIPTION

       "texfot" invokes texcmd with the given texarg arguments, filtering the online output for ``interesting''
       messages.  Its exit value is that of texcmd.  Examples:

         # Sample basic invocation:
         texfot pdflatex file.tex

         # Ordinarily all output is copied to /tmp/fot before filtering,
         # but that can be omitted:
         texfot --tee=/dev/null lualatex file.tex

         # Example of more complex engine invocation:
         texfot xelatex --recorder '\nonstopmode\input file'

       Aside from its own options, described below, "texfot" just runs the given command with the given
       arguments (same approach to command line syntax as "env", "nice", "time", "timeout", etc.).  Thus,
       "texfot" works with any engine and any command line options.

       "texfot" does not look at the log file or any other possible output file(s); it only looks at the
       standard output and standard error from the command.  stdout is processed first, then stderr.  Lines from
       stderr have an identifying prefix.  "texfot" writes all accepted lines to its stdout.

       The messages shown are intended to be those which likely need action by the author: error messages,
       overfull and underfull boxes, undefined citations, missing characters from fonts, etc.

FLOW OF OPERATION

       Here is the order in which lines of output are checked:

       1.  If the ``next line'' needs to be printed (see below), print it.

       2.  Otherwise, if the line matches the built-in list of regexps to ignore, or any user-supplied list of
           regexps to ignore (given with "--ignore", see below), in that order, ignore it.

       3.  Otherwise, if the line matches the list of regexps for which the next line (two lines in all) should
           be shown, show this line and set the ``next line'' flag for the next time around the loop.  Examples
           are the common "!" and "filename:lineno:" error messages, which are generally followed by a line with
           specific detail about the error.

       4.  Otherwise, if the line matches the list of regexps to show, show it.

       5.  Otherwise, the default: if the line came from stdout, ignore it; if the line came from stderr, print
           it (to stdout).  This distinction is made because TeX engines write relatively few messages to
           stderr, and it's likely that any such should be considered.

           It would be easy to add more options to allow for user additions to the various regex lists, if that
           ever seems useful.  Or email me (see end).

       Once a particular check matches, the program moves on to process the next line.

       Don't hesitate to peruse the source to the script, which is essentially a straightforward loop matching
       against the different lists as above.  You can see the exact regexps being matched in the different
       categories in the source.

       Incidentally, although nothing in this basic operation is specific to TeX engines, all the regular
       expressions included in the program are specific to TeX.  So in practice the program isn't useful except
       with TeX engines, although it would be easy enough to adapt it (if there was anything else as verbose as
       TeX to make that useful).

OPTIONS

       The following are the options to "texfot" itself (not the TeX engine being invoked; consult the TeX
       documentation or the engine's "--help" output for that).

       The first non-option terminates "texfot"'s option parsing, and the remainder of the command line is
       invoked as the TeX command, without further parsing.  For example, "texfot --debug tex --debug" will
       output debugging information from both "texfot" and "tex".

       Options may start with either - or --, and may be unambiguously abbreviated.  It is best to use the full
       option name in scripts, though, to avoid possible collisions with new options in the future.

       "--debug"
       "--no-debug"
           Output (or not) what is being done on standard error.  Off by default.

       "--ignore" regexp
           Ignore lines in the TeX output matching (Perl) regexp.  Can be repeated.  Adds to the default set of
           ignore regexps rather than replacing.  These regexps are not automatically anchored (or otherwise
           altered), simply used as-is.

       "--interactive"
       "--no-interactive"
           By default, standard input to the TeX process is closed so that TeX's interactive mode (waiting for
           input upon error, the "*" prompt, etc.)  is never entered.  Giving "--interactive" allows interaction
           to happen.

       "--quiet"
       "--no-quiet"
           By default, the TeX command being invoked is reported on standard output.  "--quiet" omits that
           reporting. To get a completely silent run, redirect standard output: "texfot ... >/dev/null". (The
           only messages to standard error should be errors from "texfot" itself, so it shouldn't be necessary
           to redirect that, but of course that can be done as well.)

       "--stderr"
       "--no-stderr"
           The default is for "texfot" to report everything written to stderr by the TeX command (on stdout).
           "--no-stderr" omits that reporting.  (Some programs, "dvisvgm" is one, can be rather verbose on
           stderr.)

       "--tee" file
           By default, the output being filtered is "tee"-ed, before filtering, to "$TMPDIR/fot" ("/tmp/fot" if
           "TMPDIR" is not set), to make it easy to check the full output when the filtering seems suspect.
           This option allows specifying a different file.  Use "--tee /dev/null" if you don't want the original
           output at all.

       "--version"
           Output version information and exit successfully.

       "--help"
           Display this help and exit successfully.

RATIONALE

       I wrote this because, in my work as a TUGboat editor (<http://tug.org/TUGboat>, journal submissions
       always welcome!), I run and rerun many documents, many times each. It was too easy to lose warnings I
       needed to see in the mass of unvarying and uninteresting output from TeX, such as style files being read
       and fonts being used. I wanted to see all and only those messages which needed some action by me.

       I found some other programs of a similar nature, the LaTeX package "silence", and plenty of other (La)TeX
       wrappers, but it seemed none of them did what I wanted.  Either they read the log file (I wanted the
       online output only), or they output more or less than I wanted, or they required invoking TeX differently
       (I wanted to keep my build process exactly the same, most critically the TeX invocation, which can get
       complicated).  Hence I wrote this.

       Here are some keywords if you want to explore other options: texloganalyser, pydflatex, logfilter,
       latexmk, rubber, arara, and searching for "log" at <https://ctan.org/search>.

       "texfot" is written in Perl, and runs on Unix, and does not work on Windows.

       The name comes from the "trip.fot" and "trap.fot" files that are part of Knuth's trip and trap torture
       tests, which record the online output from the programs.  I am not sure what "fot" stands for in trip and
       trap, but I can pretend that it stands for "filter online transcript" in the present case :).

AUTHORS AND COPYRIGHT

       This script and its documentation were written by Karl Berry and both are released to the public domain.
       Email "karl@freefriends.org" with bug reports.  It has no home page beyond the package on CTAN:
       <https://ctan.org/pkg/texfot>.