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 $rc = GetOptions( "long|l" => \$longrev,
32 "help|h" => \$help,
33 "rename|r" => \$rename,
34 "rev-file|S=s" => \$rev_file);
35 if (!$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 or die "Failed to open $rev_file : $!";
179 } else {
180 $revlist = open_pipe("git-rev-list","--parents","--remove-empty",$rev,"--",$file)
181 or die "Failed to exec git-rev-list: $!";
182 }
184 my @revs;
185 while(my $line = <$revlist>) {
186 chomp $line;
187 my ($rev, @parents) = split /\s+/, $line;
188 push @revs, [ $rev, @parents ];
189 }
190 close($revlist);
192 printf("0 revs found for rev %s (%s)\n", $rev, $file) if (@revs == 0);
193 return @revs;
194 }
196 sub find_parent_renames {
197 my ($rev, $file) = @_;
199 my $patch = open_pipe("git-diff-tree", "-M50", "-r","--name-status", "-z","$rev")
200 or die "Failed to exec git-diff: $!";
202 local $/ = "\0";
203 my %bound;
204 my $junk = <$patch>;
205 while (my $change = <$patch>) {
206 chomp $change;
207 my $filename = <$patch>;
208 chomp $filename;
210 if ($change =~ m/^[AMD]$/ ) {
211 next;
212 } elsif ($change =~ m/^R/ ) {
213 my $oldfilename = $filename;
214 $filename = <$patch>;
215 chomp $filename;
216 if ( $file eq $filename ) {
217 my $parent = git_find_parent($rev, $oldfilename);
218 @bound{'rev','filename'} = ($parent, $oldfilename);
219 last;
220 }
221 }
222 }
223 close($patch);
225 return \%bound;
226 }
229 sub git_find_parent {
230 my ($rev, $filename) = @_;
232 my $revparent = open_pipe("git-rev-list","--remove-empty", "--parents","--max-count=1","$rev","--",$filename)
233 or die "Failed to open git-rev-list to find a single parent: $!";
235 my $parentline = <$revparent>;
236 chomp $parentline;
237 my ($revfound,$parent) = split m/\s+/, $parentline;
239 close($revparent);
241 return $parent;
242 }
245 # Get a diff between the current revision and a parent.
246 # Record the commit information that results.
247 sub git_diff_parse {
248 my ($parent, $rev, %revinfo) = @_;
250 my $diff = open_pipe("git-diff-tree","-M","-p",$rev,$parent,"--",
251 $revs{$rev}{'filename'}, $revs{$parent}{'filename'})
252 or die "Failed to call git-diff for annotation: $!";
254 _git_diff_parse($diff, $parent, $rev, %revinfo);
256 close($diff);
257 }
259 sub _git_diff_parse {
260 my ($diff, $parent, $rev, %revinfo) = @_;
262 my ($ri, $pi) = (0,0);
263 my $slines = $revs{$rev}{'lines'};
264 my @plines;
266 my $gotheader = 0;
267 my ($remstart);
268 my ($hunk_start, $hunk_index);
269 while(<$diff>) {
270 chomp;
271 if (m/^@@ -(\d+),(\d+) \+(\d+),(\d+)/) {
272 $remstart = $1;
273 # Adjust for 0-based arrays
274 $remstart--;
275 # Reinit hunk tracking.
276 $hunk_start = $remstart;
277 $hunk_index = 0;
278 $gotheader = 1;
280 for (my $i = $ri; $i < $remstart; $i++) {
281 $plines[$pi++] = $slines->[$i];
282 $ri++;
283 }
284 next;
285 } elsif (!$gotheader) {
286 next;
287 }
289 if (m/^\+(.*)$/) {
290 my $line = $1;
291 $plines[$pi++] = [ $line, '', '', '', 0 ];
292 next;
294 } elsif (m/^-(.*)$/) {
295 my $line = $1;
296 if (get_line($slines, $ri) eq $line) {
297 # Found a match, claim
298 claim_line($ri, $rev, $slines, %revinfo);
299 } else {
300 die sprintf("Sync error: %d/%d\n|%s\n|%s\n%s => %s\n",
301 $ri, $hunk_start + $hunk_index,
302 $line,
303 get_line($slines, $ri),
304 $rev, $parent);
305 }
306 $ri++;
308 } elsif (m/^\\/) {
309 ;
310 # Skip \No newline at end of file.
311 # But this can be internationalized, so only look
312 # for an initial \
314 } else {
315 if (substr($_,1) ne get_line($slines,$ri) ) {
316 die sprintf("Line %d (%d) does not match:\n|%s\n|%s\n%s => %s\n",
317 $hunk_start + $hunk_index, $ri,
318 substr($_,1),
319 get_line($slines,$ri),
320 $rev, $parent);
321 }
322 $plines[$pi++] = $slines->[$ri++];
323 }
324 $hunk_index++;
325 }
326 for (my $i = $ri; $i < @{$slines} ; $i++) {
327 push @plines, $slines->[$ri++];
328 }
330 $revs{$parent}{lines} = \@plines;
331 return;
332 }
334 sub get_line {
335 my ($lines, $index) = @_;
337 return ref $lines->[$index] ne '' ? $lines->[$index][0] : $lines->[$index];
338 }
340 sub git_cat_file {
341 my ($rev, $filename) = @_;
342 return () unless defined $rev && defined $filename;
344 my $blob = git_ls_tree($rev, $filename);
346 my $catfile = open_pipe("git","cat-file", "blob", $blob)
347 or die "Failed to git-cat-file blob $blob (rev $rev, file $filename): " . $!;
349 my @lines;
350 while(<$catfile>) {
351 chomp;
352 push @lines, $_;
353 }
354 close($catfile);
356 return @lines;
357 }
359 sub git_ls_tree {
360 my ($rev, $filename) = @_;
362 my $lstree = open_pipe("git","ls-tree",$rev,$filename)
363 or die "Failed to call git ls-tree: $!";
365 my ($mode, $type, $blob, $tfilename);
366 while(<$lstree>) {
367 ($mode, $type, $blob, $tfilename) = split(/\s+/, $_, 4);
368 last if ($tfilename eq $filename);
369 }
370 close($lstree);
372 return $blob if $filename eq $filename;
373 die "git-ls-tree failed to find blob for $filename";
375 }
379 sub claim_line {
380 my ($floffset, $rev, $lines, %revinfo) = @_;
381 my $oline = get_line($lines, $floffset);
382 @{$lines->[$floffset]} = ( $oline, $rev,
383 $revinfo{'author'}, $revinfo{'author_date'} );
384 #printf("Claiming line %d with rev %s: '%s'\n",
385 # $floffset, $rev, $oline) if 1;
386 }
388 sub git_commit_info {
389 my ($rev) = @_;
390 my $commit = open_pipe("git-cat-file", "commit", $rev)
391 or die "Failed to call git-cat-file: $!";
393 my %info;
394 while(<$commit>) {
395 chomp;
396 last if (length $_ == 0);
398 if (m/^author (.*) <(.*)> (.*)$/) {
399 $info{'author'} = $1;
400 $info{'author_email'} = $2;
401 $info{'author_date'} = $3;
402 } elsif (m/^committer (.*) <(.*)> (.*)$/) {
403 $info{'committer'} = $1;
404 $info{'committer_email'} = $2;
405 $info{'committer_date'} = $3;
406 }
407 }
408 close($commit);
410 return %info;
411 }
413 sub format_date {
414 my ($timestamp, $timezone) = split(' ', $_[0]);
416 return strftime("%Y-%m-%d %H:%M:%S " . $timezone, gmtime($timestamp));
417 }
419 # Copied from git-send-email.perl - We need a Git.pm module..
420 sub gitvar {
421 my ($var) = @_;
422 my $fh;
423 my $pid = open($fh, '-|');
424 die "$!" unless defined $pid;
425 if (!$pid) {
426 exec('git-var', $var) or die "$!";
427 }
428 my ($val) = <$fh>;
429 close $fh or die "$!";
430 chomp($val);
431 return $val;
432 }
434 sub gitvar_name {
435 my ($name) = @_;
436 my $val = gitvar($name);
437 my @field = split(/\s+/, $val);
438 return join(' ', @field[0...(@field-4)]);
439 }
441 sub open_pipe {
442 if ($^O eq '##INSERT_ACTIVESTATE_STRING_HERE##') {
443 return open_pipe_activestate(@_);
444 } else {
445 return open_pipe_normal(@_);
446 }
447 }
449 sub open_pipe_activestate {
450 tie *fh, "Git::ActiveStatePipe", @_;
451 return *fh;
452 }
454 sub open_pipe_normal {
455 my (@execlist) = @_;
457 my $pid = open my $kid, "-|";
458 defined $pid or die "Cannot fork: $!";
460 unless ($pid) {
461 exec @execlist;
462 die "Cannot exec @execlist: $!";
463 }
465 return $kid;
466 }
468 package Git::ActiveStatePipe;
469 use strict;
471 sub TIEHANDLE {
472 my ($class, @params) = @_;
473 my $cmdline = join " ", @params;
474 my @data = qx{$cmdline};
475 bless { i => 0, data => \@data }, $class;
476 }
478 sub READLINE {
479 my $self = shift;
480 if ($self->{i} >= scalar @{$self->{data}}) {
481 return undef;
482 }
483 return $self->{'data'}->[ $self->{i}++ ];
484 }
486 sub CLOSE {
487 my $self = shift;
488 delete $self->{data};
489 delete $self->{i};
490 }
492 sub EOF {
493 my $self = shift;
494 return ($self->{i} >= scalar @{$self->{data}});
495 }