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1 | ################################################################################ |
2 | ## |
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3 | ## $Revision: 21 $ |
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4 | ## $Author: mhx $ |
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5 | ## $Date: 2004/08/17 20:00:22 +0200 $ |
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6 | ## |
7 | ################################################################################ |
8 | ## |
9 | ## Version 3.x, Copyright (C) 2004, Marcus Holland-Moritz. |
10 | ## Version 2.x, Copyright (C) 2001, Paul Marquess. |
11 | ## Version 1.x, Copyright (C) 1999, Kenneth Albanowski. |
12 | ## |
13 | ## This program is free software; you can redistribute it and/or |
14 | ## modify it under the same terms as Perl itself. |
15 | ## |
16 | ################################################################################ |
17 | |
18 | =provides |
19 | |
20 | =implementation |
21 | |
22 | =cut |
23 | |
24 | use strict; |
25 | |
26 | my %opt = ( |
27 | quiet => 0, |
28 | diag => 1, |
29 | hints => 1, |
30 | changes => 1, |
31 | cplusplus => 0, |
32 | ); |
33 | |
34 | my($ppport) = $0 =~ /([\w.]+)$/; |
35 | my $LF = '(?:\r\n|[\r\n])'; # line feed |
36 | my $HS = "[ \t]"; # horizontal whitespace |
37 | |
38 | eval { |
39 | require Getopt::Long; |
40 | Getopt::Long::GetOptions(\%opt, qw( |
41 | help quiet diag! hints! changes! cplusplus |
42 | patch=s copy=s diff=s compat-version=s |
43 | list-provided list-unsupported |
44 | )) or usage(); |
45 | }; |
46 | |
47 | if ($@ and grep /^-/, @ARGV) { |
48 | usage() if "@ARGV" =~ /^--?h(?:elp)?$/; |
49 | die "Getopt::Long not found. Please don't use any options.\n"; |
50 | } |
51 | |
52 | usage() if $opt{help}; |
53 | |
54 | if (exists $opt{'compat-version'}) { |
55 | my($r,$v,$s) = eval { parse_version($opt{'compat-version'}) }; |
56 | if ($@) { |
57 | die "Invalid version number format: '$opt{'compat-version'}'\n"; |
58 | } |
59 | die "Only Perl 5 is supported\n" if $r != 5; |
60 | die "Invalid version number: $opt{'compat-version'}\n" if $v >= 1000 || $v >= 1000; |
61 | $opt{'compat-version'} = sprintf "%d.%03d%03d", $r, $v, $s; |
62 | } |
63 | else { |
64 | $opt{'compat-version'} = 5; |
65 | } |
66 | |
67 | # Never use C comments in this file!!!!! |
68 | my $ccs = '/'.'*'; |
69 | my $cce = '*'.'/'; |
70 | my $rccs = quotemeta $ccs; |
71 | my $rcce = quotemeta $cce; |
72 | |
73 | my @files; |
74 | |
75 | if (@ARGV) { |
76 | @files = map { glob $_ } @ARGV; |
77 | } |
78 | else { |
79 | eval { |
80 | require File::Find; |
81 | File::Find::find(sub { |
82 | $File::Find::name =~ /\.(xs|c|h|cc)$/i |
83 | and push @files, $File::Find::name; |
84 | }, '.'); |
85 | }; |
86 | if ($@) { |
87 | @files = map { glob $_ } qw(*.xs *.c *.h *.cc); |
88 | } |
89 | my %filter = map { /(.*)\.xs$/ ? ("$1.c" => 1) : () } @files; |
90 | @files = grep { !/\b\Q$ppport\E$/i && !exists $filter{$_} } @files; |
91 | } |
92 | |
93 | unless (@files) { |
94 | die "No input files given!\n"; |
95 | } |
96 | |
97 | my %API = map { /^(\w+)\|([^|]*)\|([^|]*)\|(\w*)$/ |
98 | ? ( $1 => { |
99 | ($2 ? ( base => $2 ) : ()), |
100 | ($3 ? ( todo => $3 ) : ()), |
101 | (index($4, 'v') >= 0 ? ( varargs => 1 ) : ()), |
102 | (index($4, 'p') >= 0 ? ( provided => 1 ) : ()), |
103 | (index($4, 'n') >= 0 ? ( nothxarg => 1 ) : ()), |
104 | } ) |
105 | : die "invalid spec: $_" } qw( |
106 | __PERL_API__ |
107 | ); |
108 | |
109 | if (exists $opt{'list-unsupported'}) { |
110 | my $f; |
111 | for $f (sort { lc $a cmp lc $b } keys %API) { |
112 | next unless $API{$f}{todo}; |
113 | print "$f ", '.'x(40-length($f)), " ", format_version($API{$f}{todo}), "\n"; |
114 | } |
115 | exit 0; |
116 | } |
117 | |
118 | # Scan for possible replacement candidates |
119 | |
120 | my(%replace, %need, %hints, %depends); |
121 | my $replace = 0; |
122 | my $hint = ''; |
123 | |
124 | while (<DATA>) { |
125 | if ($hint) { |
126 | if (m{^\s*\*\s(.*?)\s*$}) { |
127 | $hints{$hint} ||= ''; # suppress warning with older perls |
128 | $hints{$hint} .= "$1\n"; |
129 | } |
130 | else { |
131 | $hint = ''; |
132 | } |
133 | } |
134 | $hint = $1 if m{^\s*$rccs\sHint:\s+(\w+)\s*$}; |
135 | |
136 | $replace = $1 if m{^\s*$rccs\s+Replace:\s+(\d+)\s+$rcce\s*$}; |
137 | $replace{$2} = $1 if $replace and m{^\s*#\s*define\s+(\w+)(?:\([^)]*\))?\s+(\w+)}; |
138 | $replace{$2} = $1 if m{^\s*#\s*define\s+(\w+)(?:\([^)]*\))?\s+(\w+).*$rccs\s+Replace\s+$rcce}; |
139 | $replace{$1} = $2 if m{^\s*$rccs\s+Replace (\w+) with (\w+)\s+$rcce\s*$}; |
140 | |
141 | if (m{^\s*$rccs\s+(\w+)\s+depends\s+on\s+(\w+(\s*,\s*\w+)*)\s+$rcce\s*$}) { |
142 | push @{$depends{$1}}, map { s/\s+//g; $_ } split /,/, $2; |
143 | } |
144 | |
145 | $need{$1} = 1 if m{^#if\s+defined\(NEED_(\w+)(?:_GLOBAL)?\)}; |
146 | } |
147 | |
148 | if (exists $opt{'list-provided'}) { |
149 | my $f; |
150 | for $f (sort { lc $a cmp lc $b } keys %API) { |
151 | next unless $API{$f}{provided}; |
152 | my @flags; |
153 | push @flags, 'explicit' if exists $need{$f}; |
154 | push @flags, 'depend' if exists $depends{$f}; |
155 | push @flags, 'hint' if exists $hints{$f}; |
156 | my $flags = @flags ? ' ['.join(', ', @flags).']' : ''; |
157 | print "$f$flags\n"; |
158 | } |
159 | exit 0; |
160 | } |
161 | |
162 | my(%files, %global, %revreplace); |
163 | %revreplace = reverse %replace; |
164 | my $filename; |
165 | my $patch_opened = 0; |
166 | |
167 | for $filename (@files) { |
168 | unless (open IN, "<$filename") { |
169 | warn "Unable to read from $filename: $!\n"; |
170 | next; |
171 | } |
172 | |
173 | info("Scanning $filename ..."); |
174 | |
175 | my $c = do { local $/; <IN> }; |
176 | close IN; |
177 | |
178 | my %file = (orig => $c, changes => 0); |
179 | |
180 | # temporarily remove C comments from the code |
181 | my @ccom; |
182 | $c =~ s{ |
183 | ( |
184 | [^"'/]+ |
185 | | |
186 | (?:"[^"\\]*(?:\\.[^"\\]*)*" [^"'/]*)+ |
187 | | |
188 | (?:'[^'\\]*(?:\\.[^'\\]*)*' [^"'/]*)+ |
189 | ) |
190 | | |
191 | (/ (?: |
192 | \*[^*]*\*+(?:[^$ccs][^*]*\*+)* / |
193 | | |
194 | /[^\r\n]* |
195 | )) |
196 | }{ |
197 | defined $2 and push @ccom, $2; |
198 | defined $1 ? $1 : "$ccs$#ccom$cce"; |
199 | }egsx; |
200 | |
201 | $file{ccom} = \@ccom; |
202 | $file{code} = $c; |
203 | $file{has_inc_ppport} = ($c =~ /#.*include.*\Q$ppport\E/); |
204 | |
205 | my $func; |
206 | |
207 | for $func (keys %API) { |
208 | my $match = $func; |
209 | $match .= "|$revreplace{$func}" if exists $revreplace{$func}; |
210 | if ($c =~ /\b(?:Perl_)?($match)\b/) { |
211 | $file{uses_replace}{$1}++ if exists $revreplace{$func} && $1 eq $revreplace{$func}; |
212 | $file{uses_Perl}{$func}++ if $c =~ /\bPerl_$func\b/; |
213 | if (exists $API{$func}{provided}) { |
214 | if (!exists $API{$func}{base} || $API{$func}{base} > $opt{'compat-version'}) { |
215 | $file{uses}{$func}++; |
adfe19db |
216 | my @deps = rec_depend($func); |
217 | if (@deps) { |
218 | $file{uses_deps}{$func} = \@deps; |
219 | for (@deps) { |
220 | $file{uses}{$_} = 0 unless exists $file{uses}{$_}; |
adfe19db |
221 | } |
222 | } |
223 | for ($func, @deps) { |
224 | if (exists $need{$_}) { |
225 | $file{needs}{$_} = 'static'; |
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226 | } |
227 | } |
228 | } |
229 | } |
230 | if (exists $API{$func}{todo} && $API{$func}{todo} > $opt{'compat-version'}) { |
231 | if ($c =~ /\b$func\b/) { |
232 | $file{uses_todo}{$func}++; |
adfe19db |
233 | } |
234 | } |
235 | } |
236 | } |
237 | |
238 | while ($c =~ /^$HS*#$HS*define$HS+(NEED_(\w+?)(_GLOBAL)?)\b/mg) { |
239 | if (exists $need{$2}) { |
240 | $file{defined $3 ? 'needed_global' : 'needed_static'}{$2}++; |
adfe19db |
241 | } |
242 | else { |
243 | warning("Possibly wrong #define $1 in $filename"); |
244 | } |
245 | } |
246 | |
96ad942f |
247 | for (qw(uses needs uses_todo needed_global needed_static)) { |
248 | for $func (keys %{$file{$_}}) { |
249 | push @{$global{$_}{$func}}, $filename; |
250 | } |
251 | } |
252 | |
adfe19db |
253 | $files{$filename} = \%file; |
254 | } |
255 | |
256 | # Globally resolve NEED_'s |
257 | my $need; |
258 | for $need (keys %{$global{needs}}) { |
259 | if (@{$global{needs}{$need}} > 1) { |
260 | my @targets = @{$global{needs}{$need}}; |
261 | my @t = grep $files{$_}{needed_global}{$need}, @targets; |
262 | @targets = @t if @t; |
263 | @t = grep /\.xs$/i, @targets; |
264 | @targets = @t if @t; |
265 | my $target = shift @targets; |
266 | $files{$target}{needs}{$need} = 'global'; |
267 | for (@{$global{needs}{$need}}) { |
268 | $files{$_}{needs}{$need} = 'extern' if $_ ne $target; |
269 | } |
270 | } |
271 | } |
272 | |
273 | for $filename (@files) { |
274 | exists $files{$filename} or next; |
275 | |
276 | info("=== Analyzing $filename ==="); |
277 | |
278 | my %file = %{$files{$filename}}; |
279 | my $func; |
280 | my $c = $file{code}; |
281 | |
282 | for $func (sort keys %{$file{uses_Perl}}) { |
283 | if ($API{$func}{varargs}) { |
284 | my $changes = ($c =~ s{\b(Perl_$func\s*\(\s*)(?!aTHX_?)(\)|[^\s)]*\))} |
285 | { $1 . ($2 eq ')' ? 'aTHX' : 'aTHX_ ') . $2 }ge); |
286 | if ($changes) { |
287 | warning("Doesn't pass interpreter argument aTHX to Perl_$func"); |
288 | $file{changes} += $changes; |
289 | } |
290 | } |
291 | else { |
292 | warning("Uses Perl_$func instead of $func"); |
293 | $file{changes} += ($c =~ s{\bPerl_$func(\s*)\((\s*aTHX_?)?\s*} |
294 | {$func$1(}g); |
295 | } |
296 | } |
297 | |
298 | for $func (sort keys %{$file{uses_replace}}) { |
299 | warning("Uses $func instead of $replace{$func}"); |
300 | $file{changes} += ($c =~ s/\b$func\b/$replace{$func}/g); |
301 | } |
302 | |
303 | for $func (sort keys %{$file{uses}}) { |
304 | next unless $file{uses}{$func}; # if it's only a dependency |
305 | if (exists $file{uses_deps}{$func}) { |
306 | diag("Uses $func, which depends on ", join(', ', @{$file{uses_deps}{$func}})); |
307 | } |
308 | elsif (exists $replace{$func}) { |
309 | warning("Uses $func instead of $replace{$func}"); |
310 | $file{changes} += ($c =~ s/\b$func\b/$replace{$func}/g); |
311 | } |
312 | else { |
313 | diag("Uses $func"); |
314 | } |
315 | hint($func); |
316 | } |
317 | |
318 | for $func (sort keys %{$file{uses_todo}}) { |
319 | warning("Uses $func, which may not be portable below perl ", |
320 | format_version($API{$func}{todo})); |
321 | } |
322 | |
323 | for $func (sort keys %{$file{needed_static}}) { |
324 | my $message = ''; |
325 | if (not exists $file{uses}{$func}) { |
326 | $message = "No need to define NEED_$func if $func is never used"; |
327 | } |
328 | elsif (exists $file{needs}{$func} && $file{needs}{$func} ne 'static') { |
329 | $message = "No need to define NEED_$func when already needed globally"; |
330 | } |
331 | if ($message) { |
332 | diag($message); |
333 | $file{changes} += ($c =~ s/^$HS*#$HS*define$HS+NEED_$func\b.*$LF//mg); |
334 | } |
335 | } |
336 | |
337 | for $func (sort keys %{$file{needed_global}}) { |
338 | my $message = ''; |
339 | if (not exists $global{uses}{$func}) { |
340 | $message = "No need to define NEED_${func}_GLOBAL if $func is never used"; |
341 | } |
342 | elsif (exists $file{needs}{$func}) { |
343 | if ($file{needs}{$func} eq 'extern') { |
344 | $message = "No need to define NEED_${func}_GLOBAL when already needed globally"; |
345 | } |
346 | elsif ($file{needs}{$func} eq 'static') { |
347 | $message = "No need to define NEED_${func}_GLOBAL when only used in this file"; |
348 | } |
349 | } |
350 | if ($message) { |
351 | diag($message); |
352 | $file{changes} += ($c =~ s/^$HS*#$HS*define$HS+NEED_${func}_GLOBAL\b.*$LF//mg); |
353 | } |
354 | } |
355 | |
356 | $file{needs_inc_ppport} = keys %{$file{uses}}; |
357 | |
358 | if ($file{needs_inc_ppport}) { |
359 | my $pp = ''; |
360 | |
361 | for $func (sort keys %{$file{needs}}) { |
362 | my $type = $file{needs}{$func}; |
363 | next if $type eq 'extern'; |
364 | my $suffix = $type eq 'global' ? '_GLOBAL' : ''; |
365 | unless (exists $file{"needed_$type"}{$func}) { |
366 | if ($type eq 'global') { |
367 | diag("Files [@{$global{needs}{$func}}] need $func, adding global request"); |
368 | } |
369 | else { |
370 | diag("File needs $func, adding static request"); |
371 | } |
372 | $pp .= "#define NEED_$func$suffix\n"; |
373 | } |
374 | } |
375 | |
376 | if ($pp && ($c =~ s/^(?=$HS*#$HS*define$HS+NEED_\w+)/$pp/m)) { |
377 | $pp = ''; |
378 | $file{changes}++; |
379 | } |
380 | |
381 | unless ($file{has_inc_ppport}) { |
382 | diag("Needs to include '$ppport'"); |
383 | $pp .= qq(#include "$ppport"\n) |
384 | } |
385 | |
386 | if ($pp) { |
387 | $file{changes} += ($c =~ s/^($HS*#$HS*define$HS+NEED_\w+.*?)^/$1$pp/ms) |
388 | || ($c =~ s/^(?=$HS*#$HS*include.*\Q$ppport\E)/$pp/m) |
389 | || ($c =~ s/^($HS*#$HS*include.*XSUB.*\s*?)^/$1$pp/m) |
390 | || ($c =~ s/^/$pp/); |
391 | } |
392 | } |
393 | else { |
394 | if ($file{has_inc_ppport}) { |
395 | diag("No need to include '$ppport'"); |
396 | $file{changes} += ($c =~ s/^$HS*?#$HS*include.*\Q$ppport\E.*?$LF//m); |
397 | } |
398 | } |
399 | |
400 | # put back in our C comments |
401 | my $ix; |
402 | my $cppc = 0; |
403 | my @ccom = @{$file{ccom}}; |
404 | for $ix (0 .. $#ccom) { |
405 | if (!$opt{cplusplus} && $ccom[$ix] =~ s!^//!!) { |
406 | $cppc++; |
407 | $file{changes} += $c =~ s/$rccs$ix$rcce/$ccs$ccom[$ix] $cce/; |
408 | } |
409 | else { |
410 | $c =~ s/$rccs$ix$rcce/$ccom[$ix]/; |
411 | } |
412 | } |
413 | |
414 | if ($cppc) { |
415 | my $s = $cppc != 1 ? 's' : ''; |
416 | warning("Uses $cppc C++ style comment$s, which is not portable"); |
417 | } |
418 | |
419 | if ($file{changes}) { |
420 | if (exists $opt{copy}) { |
421 | my $newfile = "$filename$opt{copy}"; |
422 | if (-e $newfile) { |
423 | error("'$newfile' already exists, refusing to write copy of '$filename'"); |
424 | } |
425 | else { |
426 | local *F; |
427 | if (open F, ">$newfile") { |
428 | info("Writing copy of '$filename' with changes to '$newfile'"); |
429 | print F $c; |
430 | close F; |
431 | } |
432 | else { |
433 | error("Cannot open '$newfile' for writing: $!"); |
434 | } |
435 | } |
436 | } |
437 | elsif (exists $opt{patch} || $opt{changes}) { |
438 | if (exists $opt{patch}) { |
439 | unless ($patch_opened) { |
440 | if (open PATCH, ">$opt{patch}") { |
441 | $patch_opened = 1; |
442 | } |
443 | else { |
444 | error("Cannot open '$opt{patch}' for writing: $!"); |
445 | delete $opt{patch}; |
446 | $opt{changes} = 1; |
447 | goto fallback; |
448 | } |
449 | } |
450 | mydiff(\*PATCH, $filename, $c); |
451 | } |
452 | else { |
453 | fallback: |
454 | info("Suggested changes:"); |
455 | mydiff(\*STDOUT, $filename, $c); |
456 | } |
457 | } |
458 | else { |
459 | my $s = $file{changes} == 1 ? '' : 's'; |
460 | info("$file{changes} potentially required change$s detected"); |
461 | } |
462 | } |
463 | else { |
464 | info("Looks good"); |
465 | } |
466 | } |
467 | |
468 | close PATCH if $patch_opened; |
469 | |
470 | exit 0; |
471 | |
472 | ####################################################################### |
473 | |
474 | sub mydiff |
475 | { |
476 | local *F = shift; |
477 | my($file, $str) = @_; |
478 | my $diff; |
479 | |
480 | if (exists $opt{diff}) { |
481 | $diff = run_diff($opt{diff}, $file, $str); |
482 | } |
483 | |
484 | if (!defined $diff and can_use('Text::Diff')) { |
485 | $diff = Text::Diff::diff($file, \$str, { STYLE => 'Unified' }); |
486 | $diff = <<HEADER . $diff; |
487 | --- $file |
488 | +++ $file.patched |
489 | HEADER |
490 | } |
491 | |
492 | if (!defined $diff) { |
493 | $diff = run_diff('diff -u', $file, $str); |
494 | } |
495 | |
496 | if (!defined $diff) { |
497 | $diff = run_diff('diff', $file, $str); |
498 | } |
499 | |
500 | if (!defined $diff) { |
501 | error("Cannot generate a diff. Please install Text::Diff or use --copy."); |
502 | return; |
503 | } |
504 | |
505 | print F $diff; |
506 | |
507 | } |
508 | |
509 | sub run_diff |
510 | { |
511 | my($prog, $file, $str) = @_; |
512 | my $tmp = 'dppptemp'; |
513 | my $suf = 'aaa'; |
514 | my $diff = ''; |
515 | local *F; |
516 | |
517 | while (-e "$tmp.$suf") { $suf++ } |
518 | $tmp = "$tmp.$suf"; |
519 | |
520 | if (open F, ">$tmp") { |
521 | print F $str; |
522 | close F; |
523 | |
524 | if (open F, "$prog $file $tmp |") { |
525 | while (<F>) { |
526 | s/\Q$tmp\E/$file.patched/; |
527 | $diff .= $_; |
528 | } |
529 | close F; |
530 | unlink $tmp; |
531 | return $diff; |
532 | } |
533 | |
534 | unlink $tmp; |
535 | } |
536 | else { |
537 | error("Cannot open '$tmp' for writing: $!"); |
538 | } |
539 | |
540 | return undef; |
541 | } |
542 | |
543 | sub can_use |
544 | { |
545 | eval "use @_;"; |
546 | return $@ eq ''; |
547 | } |
548 | |
549 | sub rec_depend |
550 | { |
551 | my $func = shift; |
96ad942f |
552 | my %seen; |
adfe19db |
553 | return () unless exists $depends{$func}; |
96ad942f |
554 | grep !$seen{$_}++, map { ($_, rec_depend($_)) } @{$depends{$func}}; |
adfe19db |
555 | } |
556 | |
557 | sub parse_version |
558 | { |
559 | my $ver = shift; |
560 | |
561 | if ($ver =~ /^(\d+)\.(\d+)\.(\d+)$/) { |
562 | return ($1, $2, $3); |
563 | } |
564 | elsif ($ver !~ /^\d+\.[\d_]+$/) { |
565 | die "cannot parse version '$ver'\n"; |
566 | } |
567 | |
568 | $ver =~ s/_//g; |
569 | $ver =~ s/$/000000/; |
570 | |
571 | my($r,$v,$s) = $ver =~ /(\d+)\.(\d{3})(\d{3})/; |
572 | |
573 | $v = int $v; |
574 | $s = int $s; |
575 | |
576 | if ($r < 5 || ($r == 5 && $v < 6)) { |
577 | if ($s % 10) { |
578 | die "cannot parse version '$ver'\n"; |
579 | } |
580 | } |
581 | |
582 | return ($r, $v, $s); |
583 | } |
584 | |
585 | sub format_version |
586 | { |
587 | my $ver = shift; |
588 | |
589 | $ver =~ s/$/000000/; |
590 | my($r,$v,$s) = $ver =~ /(\d+)\.(\d{3})(\d{3})/; |
591 | |
592 | $v = int $v; |
593 | $s = int $s; |
594 | |
595 | if ($r < 5 || ($r == 5 && $v < 6)) { |
596 | if ($s % 10) { |
597 | die "invalid version '$ver'\n"; |
598 | } |
599 | $s /= 10; |
600 | |
601 | $ver = sprintf "%d.%03d", $r, $v; |
602 | $s > 0 and $ver .= sprintf "_%02d", $s; |
603 | |
604 | return $ver; |
605 | } |
606 | |
607 | return sprintf "%d.%d.%d", $r, $v, $s; |
608 | } |
609 | |
610 | sub info |
611 | { |
612 | $opt{quiet} and return; |
613 | print @_, "\n"; |
614 | } |
615 | |
616 | sub diag |
617 | { |
618 | $opt{quiet} and return; |
619 | $opt{diag} and print @_, "\n"; |
620 | } |
621 | |
622 | sub warning |
623 | { |
624 | $opt{quiet} and return; |
625 | print "*** ", @_, "\n"; |
626 | } |
627 | |
628 | sub error |
629 | { |
630 | print "*** ERROR: ", @_, "\n"; |
631 | } |
632 | |
633 | my %given_hints; |
634 | sub hint |
635 | { |
636 | $opt{quiet} and return; |
637 | $opt{hints} or return; |
638 | my $func = shift; |
639 | exists $hints{$func} or return; |
640 | $given_hints{$func}++ and return; |
641 | my $hint = $hints{$func}; |
642 | $hint =~ s/^/ /mg; |
643 | print " --- hint for $func ---\n", $hint; |
644 | } |
645 | |
646 | sub usage |
647 | { |
648 | my($usage) = do { local(@ARGV,$/)=($0); <> } =~ /^=head\d$HS+SYNOPSIS\s*^(.*?)\s*^=/ms; |
649 | my %M = ( 'I' => '*' ); |
650 | $usage =~ s/^\s*perl\s+\S+/$^X $0/; |
651 | $usage =~ s/([A-Z])<([^>]+)>/$M{$1}$2$M{$1}/g; |
652 | |
653 | print <<ENDUSAGE; |
654 | |
655 | Usage: $usage |
656 | |
657 | See perldoc $0 for details. |
658 | |
659 | ENDUSAGE |
660 | |
661 | exit 2; |
662 | } |