create-html-usage.pl

   1 #!/usr/bin/env perl
   2
   3 # create-html-usage.pl -- insert usage lines into README
   4 # Cpoyright (C) 2015 Kyle J. McKay.  All rights reserved.
   5 # License GPLv2 or, at your option, any later version.
   6
   7 use strict;
   8 use warnings;
   9
  10 use File::Basename;
  11
  12 my $mydir = dirname($0);
  13 my $last = undef;
  14
  15 sub get_tg_usage($)
  16 {
  17         my $name = shift;
  18         my $xname;
  19         for ("$mydir/tg-$name", "$mydir/tg--$name") {
  20                 -x $_ and $xname=$_, last;
  21         }
  22         if (defined $xname) {
  23                 my $usage = `"$xname" -h 2>&1`;
  24                 chomp $usage;
  25                 $usage =~ s/^(Usage|\s+Or):\s*//mig;
  26                 return split "\n", $usage;
  27         } elsif ($name eq "help") {
  28                 return "tg help [-w] [<command>]";
  29         } elsif ($name eq "status") {
  30                 my $tgsthelp = $ENV{TG_STATUS_HELP_USAGE} || "status";
  31                 return "tg $tgsthelp";
  32         }
  33         return undef;
  34 }
  35
  36 sub wrap
  37 {
  38         my ($w, $i, $s) = @_;
  39         my $h = ' ' x $i;
  40         my $ans = '';
  41         while (length($s) > $w && $s =~ /^(.{1,$w})(?<=\w)\b[ \t]+(.+)$/s) {
  42                 $ans .= $1."\n";
  43                 $s = "$h$2";
  44         }
  45         $ans .= $s if $s !~ /^\s*$/;
  46         return $ans;
  47 }
  48
  49 my $textmode;
  50 $textmode=1, shift if defined($ARGV[0]) && $ARGV[0] eq '--text';
  51 my $tab = ' ' x 8;
  52 while (my $line = <>) {
  53         chomp $line;
  54         1 while $line =~ s/\t+/" " x (($+[0] - $-[0]) * 8 - $-[0] % 8)/e;
  55         $line =~ s'^``(.*)``$'wrap(78, 4, $1)'e if $textmode;
  56         $line =~ s'^(\s*):`(.+?)`_:'"$1$2 "'e if $textmode;
  57         if (defined($last)) {
  58                 printf "%s\n",  $last;
  59                 if ($line =~ /^[~]+$/ && $last =~ /^tg ([^\s]+)$/) {
  60                         my @usage = get_tg_usage($1);
  61                         if (@usage) {
  62                                 printf "%s\n", $line;
  63                                 if ($textmode) {
  64                                         printf "%s", join("",map({wrap(78, 12, "$tab$_")."\n"} @usage));
  65                                 } else {
  66                                         printf "%s", join("",map({"$tab| ".'``'.$_.'``'."\n"} @usage));
  67                                 }
  68                                 $line = "";
  69                         }
  70                 }
  71         }
  72         $last = $line;
  73 }
  74
  75 printf "%s\n", $last if defined($last);
  76 exit 0;