texfot (11oct14)

git-svn-id: svn://tug.org/texlive/trunk@35356 c570f23f-e606-0410-a88d-b1316a301751

4 files changed, 186 insertions, 92 deletions

diff --git a/Master/texmf-dist/doc/man/man1/texfot.1 b/Master/texmf-dist/doc/man/man1/texfot.1
index b0b18cd683d..70795a88e24 100644
--- a/Master/texmf-dist/doc/man/man1/texfot.1
+++ b/Master/texmf-dist/doc/man/man1/texfot.1
@@ -1,4 +1,4 @@
-.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28)
+.\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.28)
 .\"
 .\" Standard preamble:
 .\" ========================================================================
@@ -133,7 +133,7 @@
 .\" ========================================================================
 .\"
 .IX Title "TEXFOT 1"
-.TH TEXFOT 1 "2014-03-10" "texfot" "Karl Berry"
+.TH TEXFOT 1 "2014-10-10" "texfot" "Karl Berry"
 .\" For nroff, turn off justification.  Always turn off hyphenation; it makes
 .\" way too many mistakes in technical documents.
 .if n .ad l
@@ -150,28 +150,31 @@ filtering the online output for ``interesting'' messages.  Its exit
 value is that of \fItexcmd\fR.  Examples:
 .PP
 .Vb 2
-\&  # Basic invocation:
+\&  # Sample basic invocation:
 \&  texfot pdflatex file.tex
 \&  
-\&  # Ordinarily the output is copied to /tmp/fot before filtering;
+\&  # Ordinarily all output is copied to /tmp/fot before filtering;
 \&  # omit that:
 \&  texfot \-\-tee=/dev/null file.tex
 \&  
-\&  # Example with more complex engine invocation:
+\&  # Example of more complex engine invocation:
 \&  texfot lualatex \-\-recorder \*(Aq\enonstopmode\einput file\*(Aq
 .Ve
 .PP
 Aside from its own options, described below, \f(CW\*(C`texfot\*(C'\fR just runs the
 given command with the given arguments (same approach to command line
-syntax as \f(CW\*(C`nice\*(C'\fR, \f(CW\*(C`time\*(C'\fR, \f(CW\*(C`timeout\*(C'\fR, etc.).  Thus, \f(CW\*(C`texfot\*(C'\fR works
-with any engine and any command line options.
+syntax as \f(CW\*(C`env\*(C'\fR, \f(CW\*(C`nice\*(C'\fR, \f(CW\*(C`time\*(C'\fR, \f(CW\*(C`timeout\*(C'\fR, etc.).  Thus, \f(CW\*(C`texfot\*(C'\fR
+works with any engine and any command line options.
 .PP
 \&\f(CW\*(C`texfot\*(C'\fR does not look at the log file or any other possible output
-file(s); it only looks at standard output from the command.
+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.  \f(CW\*(C`texfot\*(C'\fR writes all accepted lines to its
+stdout.
 .PP
-The messages shown are intended to be those which probably deserve some
-action by the author: error messages, overfull and underfull boxes,
-undefined citations, missing characters from fonts, etc.
+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.
 .SH "FLOW OF OPERATION"
 .IX Header "FLOW OF OPERATION"
 Here is the order in which lines of output are checked:
@@ -190,15 +193,18 @@ followed by a line with specific detail about the error.
 .IP "4." 4
 Otherwise, if the line matches the list of regexps to show, show it.
 .IP "5." 4
-Otherwise, ignore this line.
+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
+not unlikely that any such should be considered.
 .PP
-Once a particular check matches, the program moves on process the next
-line.
+Once a particular check matches, the program moves on to process the
+next line.
 .PP
 Don't hesitate to peruse the source to the script, which is essentially
-a straightforward loop matching against the different regexp lists as
-above.  You can see all the messages in the different categories in the
-source.
+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.
 .PP
 Incidentally, although nothing in this basic operation is specific to
 TeX engines, all the regular expressions included in the program are
@@ -209,9 +215,11 @@ anything else as verbose as TeX to make that useful).
 .IX Header "OPTIONS"
 The following are the options to \f(CW\*(C`texfot\*(C'\fR itself (not the TeX engine
 being invoked; consult the TeX documentation or the engine's \f(CW\*(C`\-\-help\*(C'\fR
-output for that).  The first non-option terminates \f(CW\*(C`texfot\*(C'\fR's option
-parsing, and the remainder of the command line is invoked as the TeX
-command, without further parsing.  For example, \f(CW\*(C`texfot \-\-debug tex
+output for that).
+.PP
+The first non-option terminates \f(CW\*(C`texfot\*(C'\fR's option parsing, and the
+remainder of the command line is invoked as the TeX command, without
+further parsing.  For example, \f(CW\*(C`texfot \-\-debug tex
 \&\-\-debug\*(C'\fR will output debugging information from both \f(CW\*(C`texfot\*(C'\fR and
 \&\f(CW\*(C`tex\*(C'\fR.
 .PP
@@ -233,7 +241,7 @@ Output (or not) what is being done on standard error.  Off by default.
 Ignore lines in the TeX output matching (Perl) \fIregexp\fR.  Can be
 repeated.  Adds to the default set of ignore regexps rather than
 replacing.  These regexps are not automatically anchored (or otherwise
-altered), just used as-is.
+altered), simply used as-is.
 .ie n .IP """\-\-interactive""" 4
 .el .IP "\f(CW\-\-interactive\fR" 4
 .IX Item "--interactive"
@@ -254,7 +262,7 @@ never happens.  Giving \f(CW\*(C`\-\-interactive\*(C'\fR allows interaction to h
 .IX Item "--no-quiet"
 .PD
 By default, the TeX command being invoked is reported on standard output.
-\&\f(CW\*(C`\-\-quiet\*(C'\fR omits that.
+\&\f(CW\*(C`\-\-quiet\*(C'\fR omits that reporting.
 .ie n .IP """\-\-tee"" \fIfile\fR" 4
 .el .IP "\f(CW\-\-tee\fR \fIfile\fR" 4
 .IX Item "--tee file"
@@ -274,12 +282,12 @@ Display this help and exit successfully.
 .SH "RATIONALE"
 .IX Header "RATIONALE"
 I wrote this because, in my work as a TUGboat editor
-(<http://tug.org/TUGboat>, submissions welcome), I end up running and
-rerunning many papers, many times.  It was too easy to lose warnings I
-needed to see in the mass of unvarying and uninteresting output from
-TeX, such as all the style files being read and all the fonts being
-used.  I wanted to see all and only those messages which actually needed
-some action by me.
+(<http://tug.org/TUGboat>, submissions welcome, by the way), I end up
+running and rerunning many papers, 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 all the style files being read and all the
+fonts being used.  I wanted to see all and only those messages which
+actually needed some action by me.
 .PP
 I found some other programs of a similar nature, the \f(CW\*(C`silence\*(C'\fR LaTeX
 package, and plenty of other (La)TeX wrappers, but it seemed none of
@@ -287,15 +295,16 @@ 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, definitely including the TeX invocation, which can get
-complicated).  Hence I finally went ahead and wrote this.
+complicated).  Hence I wrote this.
 .PP
 Here are some keywords if you want to explore other options:
 texloganalyser, pydflatex, logfilter, latexmk, rubber, arara, and
 searching for \f(CW\*(C`log\*(C'\fR at <http://ctan.org/search>.
 .PP
 \&\f(CW\*(C`texfot\*(C'\fR is written in Perl, and runs on Unix, and does not work on
-Windows.  (If by some chance anyone wants to run this on Windows, please
-make your own fork; I'm not interested in supporting it.)
+Windows.  (If by some chance anyone wants to use this program on
+Windows, please make your own fork; I'm not interested in supporting
+it.)
 .PP
 The name comes from the \f(CW\*(C`trip.fot\*(C'\fR and \f(CW\*(C`trap.fot\*(C'\fR files that are part
 of Knuth's trip and trap torture tests, which record the online output
@@ -304,7 +313,7 @@ trap, but I can pretend that it stands for \*(L"filter online transcript\*(R" in
 the present case\ :).
 .SH "AUTHORS AND COPYRIGHT"
 .IX Header "AUTHORS AND COPYRIGHT"
-This script and its documentation were written by Karl Berry and both are
-released to the public domain.  Email \f(CW\*(C`karl@freefriends.org\*(C'\fR with
+This script and its documentation were written by Karl Berry and both
+are released to the public domain.  Email \f(CW\*(C`karl@freefriends.org\*(C'\fR with
 bug reports.  There is no home page beyond the package on \s-1CTAN:
 \&\s0<http://www.ctan.org/pkg/texfot>.
diff --git a/Master/texmf-dist/doc/man/man1/texfot.man1.pdf b/Master/texmf-dist/doc/man/man1/texfot.man1.pdf
index 09512664d91..c2693030de4 100644
--- a/Master/texmf-dist/doc/man/man1/texfot.man1.pdf
+++ b/Master/texmf-dist/doc/man/man1/texfot.man1.pdf
diff --git a/Master/texmf-dist/doc/support/texfot/README b/Master/texmf-dist/doc/support/texfot/README
index a4b7bddd10f..15481ab2542 100644
--- a/Master/texmf-dist/doc/support/texfot/README
+++ b/Master/texmf-dist/doc/support/texfot/README
@@ -2,8 +2,15 @@ texfot is a Perl script to filter the online output from a TeX run,
 attempting to show only those messages which probably deserve some
 change in the source.  The TeX invocation itself need not change.
 
+The PDF file is made from the POD documentation in the Perl source:
+  pod2man texfot.pl | groff -man -t -rS11 | ps2pdf - texfot.pdf
+
+The -t preprocesses with (g)tbl, which pod2man output might need.
+The -rS11 switches to 11pt font size.
+Supposedly it is possible to add options to either groff or ps2pdf
+(aka ghostscript) to force A4 page output, but nothing worked for me.
+
 Originally written in 2014.  Released to the public domain.
 
 Author: Karl Berry <karl@freefriends.org>
 Home page: http://www.ctan.org/pkg/texfot
-
diff --git a/Master/texmf-dist/scripts/texfot/texfot.pl b/Master/texmf-dist/scripts/texfot/texfot.pl
index 39325c4c891..a796f56e4dd 100755
--- a/Master/texmf-dist/scripts/texfot/texfot.pl
+++ b/Master/texmf-dist/scripts/texfot/texfot.pl
@@ -1,5 +1,5 @@
 #!/usr/bin/env perl
-# $Id: texfot,v 1.19 2014/03/10 16:10:56 karl Exp $
+# $Id: texfot,v 1.25 2014/10/10 17:52:53 karl Exp $
 # Invoke a TeX command, filtering all but interesting terminal output;
 # do not look at the log or check any output files.
 # Exit status is that of the subprogram.
@@ -7,9 +7,12 @@
 # 
 # Public domain.  Originally written 2014 by Karl Berry.
 
-my $ident = '$Id: texfot,v 1.19 2014/03/10 16:10:56 karl Exp $';
+my $ident = '$Id: texfot,v 1.25 2014/10/10 17:52:53 karl Exp $';
 (my $prg = $0) =~ s,^.*/,,;
-$| = 1;  # no I/O buffering
+select STDERR; $| = 1;  # no buffering
+select STDOUT; $| = 1;
+
+use IPC::Open3; # control what happens with stderr from the child.
 
 # require_order because we don't want getopt to permute anything;
 # arguments to the tex invocation must remain in order, not be handled here.
@@ -26,11 +29,13 @@ my $opt_help = 0;
 
 exit (&main ());
 
+
+# 
 sub main {
   my $ret = GetOptions (
     "debug!"       => \$opt_debug,
     "ignore=s"     => \@opt_ignore,
-    "interactive!" => \@opt_interactive,
+    "interactive!" => \$opt_interactive,
     "quiet!"       => \$opt_quiet,
     "tee=s"        => \$opt_tee,
     "version"      => \$opt_version,
@@ -49,24 +54,63 @@ sub main {
       . "Try --help if you need it."
     if ! @ARGV;
 
-  # guess we're going to do something.  typically no interaction.
+  # guess we're going to run something.  typically no interaction.
   close (STDIN) unless $opt_interactive;
 
   local *FOTTMP;
   $FOTTMP = ">$opt_tee";
-  open (FOTTMP) || die "$prg: aborting, open(FOTTMP) failed: $!";
+  open (FOTTMP) || die "$prg: aborting, open($FOTTMP) failed: $!";
 
+  # We want to grab stderr, otherwise it gets merged with stdout, not
+  # necessarily at line breaks, hence can lose useful messages.
   print "$0: invoking: @ARGV\n" unless $opt_quiet;
-  open (TEX, "-|", @ARGV) || die "$prg: open(TeX) failed: $! [cmd=@ARGV]\n";
+  local *TEXOUT, *TEXERR;
+  my $pid = open3 (undef, \*TEXOUT, \*TEXERR, @ARGV)
+            || die "$prg: fork(TeX) failed: $! [cmd=@ARGV]\n";
+  
+  # For what it's worth, some other approaches to stderr I investigated:
+  # "safe pipe open" in perlipc
+  # http://www.perlmonks.org/?node_id=757524
+  # http://stackoverflow.com/questions/3486575/direct-stderr-when-opening-pipe-in-perl
+
+  # It's not ideal to read all of stdout and then all of stderr, would
+  # be better to intermix them in the original order of child output, but
+  # it's simpler than other ways of avoiding possible deadlock (select,
+  # sysread, etc.).
+  &debug ("processing stdout from child");
+  &process_output (\*TEXOUT, "");
+  
+  &debug ("processing stderr from child");
+  &process_output (\*TEXERR, "[stderr] ");
+  
+  # Be sure everything is drained.
+  waitpid ($pid, 0) || die "$prog: waitpid($pid) failed: $!\n";
+  my $child_exit_status = $? >> 8;
+  &debug ("child exit status = $exit_status\n");
+  return $child_exit_status;
+}
 
+
+
+# Read filehandle $FH; print lines that we want to stdout, prefixed by
+# $PREFIX.  If $PREFIX is null, omit lines by default; if $PREFIX is
+# non-null, print lines by default.
+# 
+sub process_output {
+  my ($fh,$prefix) = @_;
+  
   my $print_next = 0;
-  while (<TEX>) {
-    print FOTTMP; # tee everything
-    
-    &debug ("checking for print_next (is $print_next)\n");
+  LINE: while (<$fh>) {
+    my $line = $_;
+    print FOTTMP $line; # tee everything
+
+    warn "\n" if $opt_debug; # get blank line without texfot: prefix
+    &debug ("looking at line: $_");
+    &debug ("checking if have print_next (is $print_next)\n");
     if ($print_next) {
       &debug ("  printing next ($print_next)\n");
-      print;
+      print $prefix;
+      print $line;
       $print_next = 0;
       next;
     }
@@ -75,16 +119,20 @@ sub main {
     next if /^(
       LaTeX\ Warning:\ You\ have\ requested\ package
      |LaTeX\ Font\ Warning:\ Some\ font\ shapes
-     |pdfTeX\ warning:.*inclusion:\ fou   #nd PDF version ...
-     |pdfTeX\ warning:.*inclusion:\ mul   #tiple pdfs with page group
+     |LaTeX\ Font\ Warning:\ Size\ substitutions
+     |Package\ caption\ Warning:\ Unsupported\ document\ class
+     |Package\ frenchb\.ldf\ Warning:\ (Figures|The\ definition)
      |Reloading\ Xunicode\ for\ encoding  # spurious ***
      |This\ is.*epsf\.tex                 # so what
+     |pdfTeX\ warning:.*inclusion:\ fou   #nd PDF version ...
+     |pdfTeX\ warning:.*inclusion:\ mul   #tiple pdfs with page group
+     |libpng\ warning:\ iCCP:\ Not\ recognizing
     )/x;
     
-    # don't anchor user's ignores, leave it up to them.
+    # don't anchor user ignores, leave it up to them.
     for my $user_ignore (@opt_ignore) {
-      &debug ("checking user ignore $extra_ignore\n");
-      next if /${user_ignore}/;
+      &debug ("checking user ignore '$user_ignore'\n");
+      next LINE if /${user_ignore}/;
     }
 
     &debug ("checking for print_next\n");
@@ -92,11 +140,13 @@ sub main {
       .*?:[0-9]+:        # usual file:lineno: form
      |!                  # usual ! form
      |.*pdfTeX\ warning  # pdftex complaints often cross lines
+     |LaTeX\ Font\ Warning:\ Font\ shape
      |>\ [^<]            # from \show..., but not "> <img.whatever"
      |removed\ on\ input\ line  # hyperref
     )/x) {
       &debug ("  found print_next ($1)\n");
-      print;
+      print $prefix;
+      print $line;
       $print_next = 1;
       next;
     }
@@ -118,22 +168,27 @@ sub main {
      |.*for\ symbol.*on\ input\ line
     )/x) {
       &debug ("  matched for showing ($1)\n");
-      print $_;
+      print $prefix;
+      print $line;
       next;
     }
 
-    &debug ("done with all checks, ignoring line: $_");
+    &debug ("done with all checks\n");
+    
+    if ($prefix) {
+      &debug ("prefix (stderr), showing line by default: $_");
+      print $prefix;
+      print $line;
+    } else {
+      &debug ("no prefix (stdout), ignoring line by default: $_");
+    }
   }
+}
 
-  close (TEX);
 
-  return $?;  # return exit value from command
-}
+sub debug { warn ("$prg: ", @_) if $opt_debug; }
+
 
-sub debug {
-  warn ("$prg: ", @_)
-    if $opt_debug;
-}
 __END__
 
 =head1 NAME
@@ -150,27 +205,30 @@ C<texfot> invokes I<texcmd> with the given I<texarg> arguments,
 filtering the online output for ``interesting'' messages.  Its exit
 value is that of I<texcmd>.  Examples:
 
-  # Basic invocation:
+  # Sample basic invocation:
   texfot pdflatex file.tex
   
-  # Ordinarily the output is copied to /tmp/fot before filtering;
+  # Ordinarily all output is copied to /tmp/fot before filtering;
   # omit that:
   texfot --tee=/dev/null file.tex
   
-  # Example with more complex engine invocation:
+  # Example of more complex engine invocation:
   texfot lualatex --recorder '\nonstopmode\input file'
 
 Aside from its own options, described below, C<texfot> just runs the
 given command with the given arguments (same approach to command line
-syntax as C<nice>, C<time>, C<timeout>, etc.).  Thus, C<texfot> works
-with any engine and any command line options.
+syntax as C<env>, C<nice>, C<time>, C<timeout>, etc.).  Thus, C<texfot>
+works with any engine and any command line options.
 
 C<texfot> does not look at the log file or any other possible output
-file(s); it only looks at standard output from the command.
+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.  C<texfot> writes all accepted lines to its
+stdout.
 
-The messages shown are intended to be those which probably deserve some
-action by the author: error messages, overfull and underfull boxes,
-undefined citations, missing characters from fonts, etc.
+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.
 
 =head1 FLOW OF OPERATION
 
@@ -202,17 +260,20 @@ Otherwise, if the line matches the list of regexps to show, show it.
 
 =item 5.
 
-Otherwise, ignore this line.
+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
+not unlikely that any such should be considered.
 
 =back
 
-Once a particular check matches, the program moves on process the next
-line.
+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 regexp lists as
-above.  You can see all the messages in the different categories in the
-source.
+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
@@ -224,9 +285,11 @@ anything else as verbose as TeX to make that useful).
 
 The following are the options to C<texfot> itself (not the TeX engine
 being invoked; consult the TeX documentation or the engine's C<--help>
-output for that).  The first non-option terminates C<texfot>'s option
-parsing, and the remainder of the command line is invoked as the TeX
-command, without further parsing.  For example, C<texfot --debug tex
+output for that).
+
+The first non-option terminates C<texfot>'s option parsing, and the
+remainder of the command line is invoked as the TeX command, without
+further parsing.  For example, C<texfot --debug tex
 --debug> will output debugging information from both C<texfot> and
 C<tex>.
 
@@ -247,7 +310,7 @@ Output (or not) what is being done on standard error.  Off by default.
 Ignore lines in the TeX output matching (Perl) I<regexp>.  Can be
 repeated.  Adds to the default set of ignore regexps rather than
 replacing.  These regexps are not automatically anchored (or otherwise
-altered), just used as-is.
+altered), simply used as-is.
 
 =item C<--interactive>
 
@@ -262,7 +325,7 @@ never happens.  Giving C<--interactive> allows interaction to happen.
 =item C<--no-quiet>
 
 By default, the TeX command being invoked is reported on standard output.
-C<--quiet> omits that.
+C<--quiet> omits that reporting.
 
 =item C<--tee> I<file>
 
@@ -285,12 +348,12 @@ Display this help and exit successfully.
 =head1 RATIONALE
 
 I wrote this because, in my work as a TUGboat editor
-(L<http://tug.org/TUGboat>, submissions welcome), I end up running and
-rerunning many papers, many times.  It was too easy to lose warnings I
-needed to see in the mass of unvarying and uninteresting output from
-TeX, such as all the style files being read and all the fonts being
-used.  I wanted to see all and only those messages which actually needed
-some action by me.
+(L<http://tug.org/TUGboat>, submissions welcome, by the way), I end up
+running and rerunning many papers, 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 all the style files being read and all the
+fonts being used.  I wanted to see all and only those messages which
+actually needed some action by me.
 
 I found some other programs of a similar nature, the C<silence> LaTeX
 package, and plenty of other (La)TeX wrappers, but it seemed none of
@@ -298,15 +361,16 @@ 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, definitely including the TeX invocation, which can get
-complicated).  Hence I finally went ahead and wrote this.
+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 C<log> at L<http://ctan.org/search>.
 
 C<texfot> is written in Perl, and runs on Unix, and does not work on
-Windows.  (If by some chance anyone wants to run this on Windows, please
-make your own fork; I'm not interested in supporting it.)
+Windows.  (If by some chance anyone wants to use this program on
+Windows, please make your own fork; I'm not interested in supporting
+it.)
 
 The name comes from the C<trip.fot> and C<trap.fot> files that are part
 of Knuth's trip and trap torture tests, which record the online output
@@ -316,9 +380,23 @@ the present S<case :).>
 
 =head1 AUTHORS AND COPYRIGHT
 
-This script and its documentation were written by Karl Berry and both are
-released to the public domain.  Email C<karl@freefriends.org> with
+This script and its documentation were written by Karl Berry and both
+are released to the public domain.  Email C<karl@freefriends.org> with
 bug reports.  There is no home page beyond the package on CTAN:
 L<http://www.ctan.org/pkg/texfot>.
 
 =cut
+
+# doesn't survive forks, have to use shell to rediret.
+
+#  if ($pid == 0) { # child
+#    # Unfortunately, the stderr lines are typically concatenated onto
+#    # however much of the TeX output line has happened.  Should somehow
+#    # prepend a newline to stderr lines.
+#    #open (STDERR, ">&", \*STDOUT) || die "$prg: open(STDERR) failed: $!";
+#    #warn "tying stderr";
+#    open (E, "-|", "echo-stderr", "fromerr") || die "xopen fil";
+#    close (E) || die "xclo fil";
+#    #exec (@ARGV, "2>&1") || die "$prg: exec(TeX) failed: $! [cmd=@ARGV]\n";
+#    die "$prg: after exec, shouldn't happen: $!";
+#  }