texi2pod.pl 11.8 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
#! /usr/bin/perl -w

#   Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.

# This file is part of GNU CC.

# GNU CC is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.

# GNU CC is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with GNU CC; see the file COPYING.  If not, write to
19 20
# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301 USA
21 22 23 24 25 26 27 28

# This does trivial (and I mean _trivial_) conversion of Texinfo
# markup to Perl POD format.  It's intended to be used to extract
# something suitable for a manpage from a Texinfo document.

$output = 0;
$skipping = 0;
%sects = ();
29
@sects_sequence = ();
30 31 32 33 34 35 36 37 38 39 40 41 42
$section = "";
@icstack = ();
@endwstack = ();
@skstack = ();
@instack = ();
$shift = "";
%defs = ();
$fnno = 1;
$inf = "";
$ibase = "";

while ($_ = shift) {
    if (/^-D(.*)$/) {
43 44 45 46 47 48 49 50 51 52 53 54
        if ($1 ne "") {
            $flag = $1;
        } else {
            $flag = shift;
        }
        $value = "";
        ($flag, $value) = ($flag =~ /^([^=]+)(?:=(.+))?/);
        die "no flag specified for -D\n"
            unless $flag ne "";
        die "flags may only contain letters, digits, hyphens, dashes and underscores\n"
            unless $flag =~ /^[a-zA-Z0-9_-]+$/;
        $defs{$flag} = $value;
55
    } elsif (/^-/) {
56
        usage();
57
    } else {
58 59 60
        $in = $_, next unless defined $in;
        $out = $_, next unless defined $out;
        usage();
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
    }
}

if (defined $in) {
    $inf = gensym();
    open($inf, "<$in") or die "opening \"$in\": $!\n";
    $ibase = $1 if $in =~ m|^(.+)/[^/]+$|;
} else {
    $inf = \*STDIN;
}

if (defined $out) {
    open(STDOUT, ">$out") or die "opening \"$out\": $!\n";
}

while(defined $inf) {
while(<$inf>) {
    # Certain commands are discarded without further processing.
    /^\@(?:
80 81 82 83 84 85 86
         [a-z]+index            # @*index: useful only in complete manual
         |need                  # @need: useful only in printed manual
         |(?:end\s+)?group      # @group .. @end group: ditto
         |page                  # @page: ditto
         |node                  # @node: useful only in .info file
         |(?:end\s+)?ifnottex   # @ifnottex .. @end ifnottex: use contents
        )\b/x and next;
87 88 89 90 91 92 93 94 95

    chomp;

    # Look for filename and title markers.
    /^\@setfilename\s+([^.]+)/ and $fn = $1, next;
    /^\@settitle\s+([^.]+)/ and $tl = postprocess($1), next;

    # Identify a man title but keep only the one we are interested in.
    /^\@c\s+man\s+title\s+([A-Za-z0-9-]+)\s+(.+)/ and do {
96 97 98 99 100
        if (exists $defs{$1}) {
            $fn = $1;
            $tl = postprocess($2);
        }
        next;
101 102
    };

103 104 105 106 107 108 109 110 111 112 113
    /^\@include\s+(.+)$/ and do {
        push @instack, $inf;
        $inf = gensym();

        # Try cwd and $ibase.
        open($inf, "<" . $1)
            or open($inf, "<" . $ibase . "/" . $1)
                or die "cannot open $1 or $ibase/$1: $!\n";
        next;
    };

114 115 116
    # Look for blocks surrounded by @c man begin SECTION ... @c man end.
    # This really oughta be @ifman ... @end ifman and the like, but such
    # would require rev'ing all other Texinfo translators.
117
    /^\@c\s+man\s+begin\s+([A-Za-z ]+)/ and $sect = $1, push (@sects_sequence, $sect), $output = 1, next;
118
    /^\@c\s+man\s+end/ and do {
119 120 121 122 123
        $sects{$sect} = "" unless exists $sects{$sect};
        $sects{$sect} .= postprocess($section);
        $section = "";
        $output = 0;
        next;
124 125 126 127
    };

    # handle variables
    /^\@set\s+([a-zA-Z0-9_-]+)\s*(.*)$/ and do {
128 129
        $defs{$1} = $2;
        next;
130 131
    };
    /^\@clear\s+([a-zA-Z0-9_-]+)/ and do {
132 133
        delete $defs{$1};
        next;
134 135 136 137 138 139 140 141 142 143 144
    };

    next unless $output;

    # Discard comments.  (Can't do it above, because then we'd never see
    # @c man lines.)
    /^\@c\b/ and next;

    # End-block handler goes up here because it needs to operate even
    # if we are skipping.
    /^\@end\s+([a-z]+)/ and do {
145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166
        # Ignore @end foo, where foo is not an operation which may
        # cause us to skip, if we are presently skipping.
        my $ended = $1;
        next if $skipping && $ended !~ /^(?:ifset|ifclear|ignore|menu|iftex)$/;

        die "\@end $ended without \@$ended at line $.\n" unless defined $endw;
        die "\@$endw ended by \@end $ended at line $.\n" unless $ended eq $endw;

        $endw = pop @endwstack;

        if ($ended =~ /^(?:ifset|ifclear|ignore|menu|iftex)$/) {
            $skipping = pop @skstack;
            next;
        } elsif ($ended =~ /^(?:example|smallexample|display)$/) {
            $shift = "";
            $_ = "";        # need a paragraph break
        } elsif ($ended =~ /^(?:itemize|enumerate|[fv]?table)$/) {
            $_ = "\n=back\n";
            $ic = pop @icstack;
        } else {
            die "unknown command \@end $ended at line $.\n";
        }
167 168 169 170 171 172
    };

    # We must handle commands which can cause skipping even while we
    # are skipping, otherwise we will not process nested conditionals
    # correctly.
    /^\@ifset\s+([a-zA-Z0-9_-]+)/ and do {
173 174 175 176 177
        push @endwstack, $endw;
        push @skstack, $skipping;
        $endw = "ifset";
        $skipping = 1 unless exists $defs{$1};
        next;
178 179 180
    };

    /^\@ifclear\s+([a-zA-Z0-9_-]+)/ and do {
181 182 183 184 185
        push @endwstack, $endw;
        push @skstack, $skipping;
        $endw = "ifclear";
        $skipping = 1 if exists $defs{$1};
        next;
186 187 188
    };

    /^\@(ignore|menu|iftex)\b/ and do {
189 190 191 192 193
        push @endwstack, $endw;
        push @skstack, $skipping;
        $endw = $1;
        $skipping = 1;
        next;
194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219
    };

    next if $skipping;

    # Character entities.  First the ones that can be replaced by raw text
    # or discarded outright:
    s/\@copyright\{\}/(c)/g;
    s/\@dots\{\}/.../g;
    s/\@enddots\{\}/..../g;
    s/\@([.!? ])/$1/g;
    s/\@[:-]//g;
    s/\@bullet(?:\{\})?/*/g;
    s/\@TeX\{\}/TeX/g;
    s/\@pounds\{\}/\#/g;
    s/\@minus(?:\{\})?/-/g;
    s/\\,/,/g;

    # Now the ones that have to be replaced by special escapes
    # (which will be turned back into text by unmunge())
    s/&/&amp;/g;
    s/\@\{/&lbrace;/g;
    s/\@\}/&rbrace;/g;
    s/\@\@/&at;/g;

    # Inside a verbatim block, handle @var specially.
    if ($shift ne "") {
220
        s/\@var\{([^\}]*)\}/<$1>/g;
221 222 223 224
    }

    # POD doesn't interpret E<> inside a verbatim block.
    if ($shift eq "") {
225 226
        s/</&lt;/g;
        s/>/&gt;/g;
227
    } else {
228 229
        s/</&LT;/g;
        s/>/&GT;/g;
230 231 232 233
    }

    # Single line command handlers.

234
    /^\@(?:section|unnumbered|unnumberedsec|center|heading)\s+(.+)$/
235
        and $_ = "\n=head2 $1\n";
236
    /^\@(?:subsection|subheading)\s+(.+)$/
237
        and $_ = "\n=head3 $1\n";
238 239
    /^\@(?:subsubsection|subsubheading)\s+(.+)$/
        and $_ = "\n=head4 $1\n";
240 241

    # Block command handlers:
242
    /^\@itemize\s*(\@[a-z]+|\*|-)?/ and do {
243 244
        push @endwstack, $endw;
        push @icstack, $ic;
245
        $ic = $1 ? $1 : "*";
246 247
        $_ = "\n=over 4\n";
        $endw = "itemize";
248 249 250
    };

    /^\@enumerate(?:\s+([a-zA-Z0-9]+))?/ and do {
251 252 253 254 255 256 257 258 259
        push @endwstack, $endw;
        push @icstack, $ic;
        if (defined $1) {
            $ic = $1 . ".";
        } else {
            $ic = "1.";
        }
        $_ = "\n=over 4\n";
        $endw = "enumerate";
260 261 262
    };

    /^\@([fv]?table)\s+(\@[a-z]+)/ and do {
263 264 265 266 267 268 269 270 271
        push @endwstack, $endw;
        push @icstack, $ic;
        $endw = $1;
        $ic = $2;
        $ic =~ s/\@(?:samp|strong|key|gcctabopt|option|env)/B/;
        $ic =~ s/\@(?:code|kbd)/C/;
        $ic =~ s/\@(?:dfn|var|emph|cite|i)/I/;
        $ic =~ s/\@(?:file)/F/;
        $_ = "\n=over 4\n";
272 273 274
    };

    /^\@((?:small)?example|display)/ and do {
275 276 277 278
        push @endwstack, $endw;
        $endw = $1;
        $shift = "\t";
        $_ = "";        # need a paragraph break
279 280 281
    };

    /^\@itemx?\s*(.+)?$/ and do {
282 283 284 285 286 287 288 289
        if (defined $1) {
            # Entity escapes prevent munging by the <> processing below.
            $_ = "\n=item $ic\&LT;$1\&GT;\n";
        } else {
            $_ = "\n=item $ic\n";
            $ic =~ y/A-Ya-y/B-Zb-z/;
            $ic =~ s/(\d+)/$1 + 1/eg;
        }
290 291 292 293 294 295 296 297 298 299 300 301 302 303
    };

    $section .= $shift.$_."\n";
}
# End of current file.
close($inf);
$inf = pop @instack;
}

die "No filename or title\n" unless defined $fn && defined $tl;

$sects{NAME} = "$fn \- $tl\n";
$sects{FOOTNOTES} .= "=back\n" if exists $sects{FOOTNOTES};

304 305
unshift @sects_sequence, "NAME";
for $sect (@sects_sequence) {
306
    if(exists $sects{$sect}) {
307 308 309 310 311
        $head = $sect;
        $head =~ s/SEEALSO/SEE ALSO/;
        print "=head1 $head\n\n";
        print scalar unmunge ($sects{$sect});
        print "\n";
312 313 314 315 316 317 318 319 320 321 322 323 324 325
    }
}

sub usage
{
    die "usage: $0 [-D toggle...] [infile [outfile]]\n";
}

sub postprocess
{
    local $_ = $_[0];

    # @value{foo} is replaced by whatever 'foo' is defined as.
    while (m/(\@value\{([a-zA-Z0-9_-]+)\})/g) {
326 327 328 329 330 331 332
        if (! exists $defs{$2}) {
            print STDERR "Option $2 not defined\n";
            s/\Q$1\E//;
        } else {
            $value = $defs{$2};
            s/\Q$1\E/$value/;
        }
333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350
    }

    # Formatting commands.
    # Temporary escape for @r.
    s/\@r\{([^\}]*)\}/R<$1>/g;
    s/\@(?:dfn|var|emph|cite|i)\{([^\}]*)\}/I<$1>/g;
    s/\@(?:code|kbd)\{([^\}]*)\}/C<$1>/g;
    s/\@(?:gccoptlist|samp|strong|key|option|env|command|b)\{([^\}]*)\}/B<$1>/g;
    s/\@sc\{([^\}]*)\}/\U$1/g;
    s/\@file\{([^\}]*)\}/F<$1>/g;
    s/\@w\{([^\}]*)\}/S<$1>/g;
    s/\@(?:dmn|math)\{([^\}]*)\}/$1/g;

    # Cross references are thrown away, as are @noindent and @refill.
    # (@noindent is impossible in .pod, and @refill is unnecessary.)
    # @* is also impossible in .pod; we discard it and any newline that
    # follows it.  Similarly, our macro @gol must be discarded.

351
    s/\@anchor{(?:[^\}]*)\}//g;
352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382
    s/\(?\@xref\{(?:[^\}]*)\}(?:[^.<]|(?:<[^<>]*>))*\.\)?//g;
    s/\s+\(\@pxref\{(?:[^\}]*)\}\)//g;
    s/;\s+\@pxref\{(?:[^\}]*)\}//g;
    s/\@noindent\s*//g;
    s/\@refill//g;
    s/\@gol//g;
    s/\@\*\s*\n?//g;

    # @uref can take one, two, or three arguments, with different
    # semantics each time.  @url and @email are just like @uref with
    # one argument, for our purposes.
    s/\@(?:uref|url|email)\{([^\},]*)\}/&lt;B<$1>&gt;/g;
    s/\@uref\{([^\},]*),([^\},]*)\}/$2 (C<$1>)/g;
    s/\@uref\{([^\},]*),([^\},]*),([^\},]*)\}/$3/g;

    # Turn B<blah I<blah> blah> into B<blah> I<blah> B<blah> to
    # match Texinfo semantics of @emph inside @samp.  Also handle @r
    # inside bold.
    s/&LT;/</g;
    s/&GT;/>/g;
    1 while s/B<((?:[^<>]|I<[^<>]*>)*)R<([^>]*)>/B<$1>${2}B</g;
    1 while (s/B<([^<>]*)I<([^>]+)>/B<$1>I<$2>B</g);
    1 while (s/I<([^<>]*)B<([^>]+)>/I<$1>B<$2>I</g);
    s/[BI]<>//g;
    s/([BI])<(\s+)([^>]+)>/$2$1<$3>/g;
    s/([BI])<([^>]+?)(\s+)>/$1<$2>$3/g;

    # Extract footnotes.  This has to be done after all other
    # processing because otherwise the regexp will choke on formatting
    # inside @footnote.
    while (/\@footnote/g) {
383 384 385
        s/\@footnote\{([^\}]+)\}/[$fnno]/;
        add_footnote($1, $fnno);
        $fnno++;
386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407
    }

    return $_;
}

sub unmunge
{
    # Replace escaped symbols with their equivalents.
    local $_ = $_[0];

    s/&lt;/E<lt>/g;
    s/&gt;/E<gt>/g;
    s/&lbrace;/\{/g;
    s/&rbrace;/\}/g;
    s/&at;/\@/g;
    s/&amp;/&/g;
    return $_;
}

sub add_footnote
{
    unless (exists $sects{FOOTNOTES}) {
408
        $sects{FOOTNOTES} = "\n=over 4\n\n";
409 410 411 412 413 414 415 416 417 418 419 420
    }

    $sects{FOOTNOTES} .= "=item $fnno.\n\n"; $fnno++;
    $sects{FOOTNOTES} .= $_[0];
    $sects{FOOTNOTES} .= "\n\n";
}

# stolen from Symbol.pm
{
    my $genseq = 0;
    sub gensym
    {
421 422 423 424
        my $name = "GEN" . $genseq++;
        my $ref = \*{$name};
        delete $::{$name};
        return $ref;
425 426
    }
}