1 #!/usr/bin/perl
2 # Copyright 2006, Ryan Anderson <ryan@michonline.com>
3 #
4 # GPL v2 (See COPYING)
5 #
6 # This file is licensed under the GPL v2, or a later version
7 # at the discretion of Linus Torvalds.
9 use warnings;
10 use strict;
11 use Getopt::Long;
12 use POSIX qw(strftime gmtime);
14 sub usage() {
15 print STDERR 'Usage: ${\basename $0} [-s] [-S revs-file] file [ revision ]
16 -l, --long
17 Show long rev (Defaults off)
18 -r, --rename
19 Follow renames (Defaults on).
20 -S, --rev-file revs-file
21 use revs from revs-file instead of calling git-rev-list
22 -h, --help
23 This message.
24 ';
26 exit(1);
27 }
29 our ($help, $longrev, $rename, $starting_rev, $rev_file) = (0, 0, 1);
31 my $rc = GetOptions( "long|l" => \$longrev,
32 "help|h" => \$help,
33 "rename|r" => \$rename,
34 "rev-file|S" => \$rev_file);
35 if (!$rc or $help) {
36 usage();
37 }
39 my $filename = shift @ARGV;
40 if (@ARGV) {
41 $starting_rev = shift @ARGV;
42 }
44 my @stack = (
45 {
46 'rev' => defined $starting_rev ? $starting_rev : "HEAD",
47 'filename' => $filename,
48 },
49 );
51 our @filelines = ();
53 if (defined $starting_rev) {
54 @filelines = git_cat_file($starting_rev, $filename);
55 } else {
56 open(F,"<",$filename)
57 or die "Failed to open filename: $!";
59 while(<F>) {
60 chomp;
61 push @filelines, $_;
62 }
63 close(F);
65 }
67 our %revs;
68 our @revqueue;
69 our $head;
71 my $revsprocessed = 0;
72 while (my $bound = pop @stack) {
73 my @revisions = git_rev_list($bound->{'rev'}, $bound->{'filename'});
74 foreach my $revinst (@revisions) {
75 my ($rev, @parents) = @$revinst;
76 $head ||= $rev;
78 if (!defined($rev)) {
79 $rev = "";
80 }
81 $revs{$rev}{'filename'} = $bound->{'filename'};
82 if (scalar @parents > 0) {
83 $revs{$rev}{'parents'} = \@parents;
84 next;
85 }
87 if (!$rename) {
88 next;
89 }
91 my $newbound = find_parent_renames($rev, $bound->{'filename'});
92 if ( exists $newbound->{'filename'} && $newbound->{'filename'} ne $bound->{'filename'}) {
93 push @stack, $newbound;
94 $revs{$rev}{'parents'} = [$newbound->{'rev'}];
95 }
96 }
97 }
98 push @revqueue, $head;
99 init_claim( defined $starting_rev ? $starting_rev : 'dirty');
100 unless (defined $starting_rev) {
101 my $diff = open_pipe("git","diff","-R", "HEAD", "--",$filename)
102 or die "Failed to call git diff to check for dirty state: $!";
104 _git_diff_parse($diff, $head, "dirty", (
105 'author' => gitvar_name("GIT_AUTHOR_IDENT"),
106 'author_date' => sprintf("%s +0000",time()),
107 )
108 );
109 close($diff);
110 }
111 handle_rev();
114 my $i = 0;
115 foreach my $l (@filelines) {
116 my ($output, $rev, $committer, $date);
117 if (ref $l eq 'ARRAY') {
118 ($output, $rev, $committer, $date) = @$l;
119 if (!$longrev && length($rev) > 8) {
120 $rev = substr($rev,0,8);
121 }
122 } else {
123 $output = $l;
124 ($rev, $committer, $date) = ('unknown', 'unknown', 'unknown');
125 }
127 printf("%s\t(%10s\t%10s\t%d)%s\n", $rev, $committer,
128 format_date($date), $i++, $output);
129 }
131 sub init_claim {
132 my ($rev) = @_;
133 for (my $i = 0; $i < @filelines; $i++) {
134 $filelines[$i] = [ $filelines[$i], '', '', '', 1];
135 # line,
136 # rev,
137 # author,
138 # date,
139 # 1 <-- belongs to the original file.
140 }
141 $revs{$rev}{'lines'} = \@filelines;
142 }
145 sub handle_rev {
146 my $i = 0;
147 my %seen;
148 while (my $rev = shift @revqueue) {
149 next if $seen{$rev}++;
151 my %revinfo = git_commit_info($rev);
153 foreach my $p (@{$revs{$rev}{'parents'}}) {
155 git_diff_parse($p, $rev, %revinfo);
156 push @revqueue, $p;
157 }
160 if (scalar @{$revs{$rev}{parents}} == 0) {
161 # We must be at the initial rev here, so claim everything that is left.
162 for (my $i = 0; $i < @{$revs{$rev}{lines}}; $i++) {
163 if (ref ${$revs{$rev}{lines}}[$i] eq '' || ${$revs{$rev}{lines}}[$i][1] eq '') {
164 claim_line($i, $rev, $revs{$rev}{lines}, %revinfo);
165 }
166 }
167 }
168 }
169 }
172 sub git_rev_list {
173 my ($rev, $file) = @_;
175 my $revlist;
176 if ($rev_file) {
177 open($revlist, '<' . $rev_file);
178 } else {
179 $revlist = open_pipe("git-rev-list","--parents","--remove-empty",$rev,"--",$file)
180 or die "Failed to exec git-rev-list: $!";
181 }
183 my @revs;
184 while(my $line = <$revlist>) {
185 chomp $line;
186 my ($rev, @parents) = split /\s+/, $line;
187 push @revs, [ $rev, @parents ];
188 }
189 close($revlist);
191 printf("0 revs found for rev %s (%s)\n", $rev, $file) if (@revs == 0);
192 return @revs;
193 }
195 sub find_parent_renames {
196 my ($rev, $file) = @_;
198 my $patch = open_pipe("git-diff-tree", "-M50", "-r","--name-status", "-z","$rev")
199 or die "Failed to exec git-diff: $!";
201 local $/ = "\0";
202 my %bound;
203 my $junk = <$patch>;
204 while (my $change = <$patch>) {
205 chomp $change;
206 my $filename = <$patch>;
207 chomp $filename;
209 if ($change =~ m/^[AMD]$/ ) {
210 next;
211 } elsif ($change =~ m/^R/ ) {
212 my $oldfilename = $filename;
213 $filename = <$patch>;
214 chomp $filename;
215 if ( $file eq $filename ) {
216 my $parent = git_find_parent($rev, $oldfilename);
217 @bound{'rev','filename'} = ($parent, $oldfilename);
218 last;
219 }
220 }
221 }
222 close($patch);
224 return \%bound;
225 }
228 sub git_find_parent {
229 my ($rev, $filename) = @_;
231 my $revparent = open_pipe("git-rev-list","--remove-empty", "--parents","--max-count=1","$rev","--",$filename)
232 or die "Failed to open git-rev-list to find a single parent: $!";
234 my $parentline = <$revparent>;
235 chomp $parentline;
236 my ($revfound,$parent) = split m/\s+/, $parentline;
238 close($revparent);
240 return $parent;
241 }
244 # Get a diff between the current revision and a parent.
245 # Record the commit information that results.
246 sub git_diff_parse {
247 my ($parent, $rev, %revinfo) = @_;
249 my $diff = open_pipe("git-diff-tree","-M","-p",$rev,$parent,"--",
250 $revs{$rev}{'filename'}, $revs{$parent}{'filename'})
251 or die "Failed to call git-diff for annotation: $!";
253 _git_diff_parse($diff, $parent, $rev, %revinfo);
255 close($diff);
256 }
258 sub _git_diff_parse {
259 my ($diff, $parent, $rev, %revinfo) = @_;
261 my ($ri, $pi) = (0,0);
262 my $slines = $revs{$rev}{'lines'};
263 my @plines;
265 my $gotheader = 0;
266 my ($remstart);
267 my ($hunk_start, $hunk_index);
268 while(<$diff>) {
269 chomp;
270 if (m/^@@ -(\d+),(\d+) \+(\d+),(\d+)/) {
271 $remstart = $1;
272 # Adjust for 0-based arrays
273 $remstart--;
274 # Reinit hunk tracking.
275 $hunk_start = $remstart;
276 $hunk_index = 0;
277 $gotheader = 1;
279 for (my $i = $ri; $i < $remstart; $i++) {
280 $plines[$pi++] = $slines->[$i];
281 $ri++;
282 }
283 next;
284 } elsif (!$gotheader) {
285 next;
286 }
288 if (m/^\+(.*)$/) {
289 my $line = $1;
290 $plines[$pi++] = [ $line, '', '', '', 0 ];
291 next;
293 } elsif (m/^-(.*)$/) {
294 my $line = $1;
295 if (get_line($slines, $ri) eq $line) {
296 # Found a match, claim
297 claim_line($ri, $rev, $slines, %revinfo);
298 } else {
299 die sprintf("Sync error: %d/%d\n|%s\n|%s\n%s => %s\n",
300 $ri, $hunk_start + $hunk_index,
301 $line,
302 get_line($slines, $ri),
303 $rev, $parent);
304 }
305 $ri++;
307 } else {
308 if (substr($_,1) ne get_line($slines,$ri) ) {
309 die sprintf("Line %d (%d) does not match:\n|%s\n|%s\n%s => %s\n",
310 $hunk_start + $hunk_index, $ri,
311 substr($_,1),
312 get_line($slines,$ri),
313 $rev, $parent);
314 }
315 $plines[$pi++] = $slines->[$ri++];
316 }
317 $hunk_index++;
318 }
319 for (my $i = $ri; $i < @{$slines} ; $i++) {
320 push @plines, $slines->[$ri++];
321 }
323 $revs{$parent}{lines} = \@plines;
324 return;
325 }
327 sub get_line {
328 my ($lines, $index) = @_;
330 return ref $lines->[$index] ne '' ? $lines->[$index][0] : $lines->[$index];
331 }
333 sub git_cat_file {
334 my ($rev, $filename) = @_;
335 return () unless defined $rev && defined $filename;
337 my $blob = git_ls_tree($rev, $filename);
339 my $catfile = open_pipe("git","cat-file", "blob", $blob)
340 or die "Failed to git-cat-file blob $blob (rev $rev, file $filename): " . $!;
342 my @lines;
343 while(<$catfile>) {
344 chomp;
345 push @lines, $_;
346 }
347 close($catfile);
349 return @lines;
350 }
352 sub git_ls_tree {
353 my ($rev, $filename) = @_;
355 my $lstree = open_pipe("git","ls-tree",$rev,$filename)
356 or die "Failed to call git ls-tree: $!";
358 my ($mode, $type, $blob, $tfilename);
359 while(<$lstree>) {
360 ($mode, $type, $blob, $tfilename) = split(/\s+/, $_, 4);
361 last if ($tfilename eq $filename);
362 }
363 close($lstree);
365 return $blob if $filename eq $filename;
366 die "git-ls-tree failed to find blob for $filename";
368 }
372 sub claim_line {
373 my ($floffset, $rev, $lines, %revinfo) = @_;
374 my $oline = get_line($lines, $floffset);
375 @{$lines->[$floffset]} = ( $oline, $rev,
376 $revinfo{'author'}, $revinfo{'author_date'} );
377 #printf("Claiming line %d with rev %s: '%s'\n",
378 # $floffset, $rev, $oline) if 1;
379 }
381 sub git_commit_info {
382 my ($rev) = @_;
383 my $commit = open_pipe("git-cat-file", "commit", $rev)
384 or die "Failed to call git-cat-file: $!";
386 my %info;
387 while(<$commit>) {
388 chomp;
389 last if (length $_ == 0);
391 if (m/^author (.*) <(.*)> (.*)$/) {
392 $info{'author'} = $1;
393 $info{'author_email'} = $2;
394 $info{'author_date'} = $3;
395 } elsif (m/^committer (.*) <(.*)> (.*)$/) {
396 $info{'committer'} = $1;
397 $info{'committer_email'} = $2;
398 $info{'committer_date'} = $3;
399 }
400 }
401 close($commit);
403 return %info;
404 }
406 sub format_date {
407 my ($timestamp, $timezone) = split(' ', $_[0]);
409 return strftime("%Y-%m-%d %H:%M:%S " . $timezone, gmtime($timestamp));
410 }
412 # Copied from git-send-email.perl - We need a Git.pm module..
413 sub gitvar {
414 my ($var) = @_;
415 my $fh;
416 my $pid = open($fh, '-|');
417 die "$!" unless defined $pid;
418 if (!$pid) {
419 exec('git-var', $var) or die "$!";
420 }
421 my ($val) = <$fh>;
422 close $fh or die "$!";
423 chomp($val);
424 return $val;
425 }
427 sub gitvar_name {
428 my ($name) = @_;
429 my $val = gitvar($name);
430 my @field = split(/\s+/, $val);
431 return join(' ', @field[0...(@field-4)]);
432 }
434 sub open_pipe {
435 if ($^O eq '##INSERT_ACTIVESTATE_STRING_HERE##') {
436 return open_pipe_activestate(@_);
437 } else {
438 return open_pipe_normal(@_);
439 }
440 }
442 sub open_pipe_activestate {
443 tie *fh, "Git::ActiveStatePipe", @_;
444 return *fh;
445 }
447 sub open_pipe_normal {
448 my (@execlist) = @_;
450 my $pid = open my $kid, "-|";
451 defined $pid or die "Cannot fork: $!";
453 unless ($pid) {
454 exec @execlist;
455 die "Cannot exec @execlist: $!";
456 }
458 return $kid;
459 }
461 package Git::ActiveStatePipe;
462 use strict;
464 sub TIEHANDLE {
465 my ($class, @params) = @_;
466 my $cmdline = join " ", @params;
467 my @data = qx{$cmdline};
468 bless { i => 0, data => \@data }, $class;
469 }
471 sub READLINE {
472 my $self = shift;
473 if ($self->{i} >= scalar @{$self->{data}}) {
474 return undef;
475 }
476 return $self->{'data'}->[ $self->{i}++ ];
477 }
479 sub CLOSE {
480 my $self = shift;
481 delete $self->{data};
482 delete $self->{i};
483 }
485 sub EOF {
486 my $self = shift;
487 return ($self->{i} >= scalar @{$self->{data}});
488 }