git-annotate.perl

   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.
   8
   9 use warnings;
  10 use strict;
  11 use Getopt::Long;
  12 use POSIX qw(strftime gmtime);
  13
  14 sub usage() {
  15         print STDERR 'Usage: ${\basename $0} [-s] [-S revs-file] file [ revision ]
  16         -l, --long
  17                         Show long rev (Defaults off)
  18         -r, --rename
  19                         Follow renames (Defaults on).
  20         -S, --rev-file revs-file
  21                         use revs from revs-file instead of calling git-rev-list
  22         -h, --help
  23                         This message.
  24 ';
  25
  26         exit(1);
  27 }
  28
  29 our ($help, $longrev, $rename, $starting_rev, $rev_file) = (0, 0, 1);
  30
  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 }
  38
  39 my $filename = shift @ARGV;
  40 if (@ARGV) {
  41         $starting_rev = shift @ARGV;
  42 }
  43
  44 my @stack = (
  45         {
  46                 'rev' => defined $starting_rev ? $starting_rev : "HEAD",
  47                 'filename' => $filename,
  48         },
  49 );
  50
  51 our @filelines = ();
  52
  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: $!";
  58
  59         while(<F>) {
  60                 chomp;
  61                 push @filelines, $_;
  62         }
  63         close(F);
  64
  65 }
  66
  67 our %revs;
  68 our @revqueue;
  69 our $head;
  70
  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 ||= $rev;
  77
  78                 if (!defined($rev)) {
  79                         $rev = "";
  80                 }
  81                 $revs{$rev}{'filename'} = $bound->{'filename'};
  82                 if (scalar @parents > 0) {
  83                         $revs{$rev}{'parents'} = \@parents;
  84                         next;
  85                 }
  86
  87                 if (!$rename) {
  88                         next;
  89                 }
  90
  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 $starting_rev) {
 101         open(DIFF,"-|","git","diff","-R", "HEAD", "--",$filename)
 102                 or die "Failed to call git diff to check for dirty state: $!";
 103
 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();
 112
 113
 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         }
 126
 127         printf("%s\t(%10s\t%10s\t%d)%s\n", $rev, $committer,
 128                 format_date($date), $i++, $output);
 129 }
 130
 131 sub init_claim {
 132         my ($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 }
 143
 144
 145 sub handle_rev {
 146         my $i = 0;
 147         my %seen;
 148         while (my $rev = shift @revqueue) {
 149                 next if $seen{$rev}++;
 150
 151                 my %revinfo = git_commit_info($rev);
 152
 153                 foreach my $p (@{$revs{$rev}{'parents'}}) {
 154
 155                         git_diff_parse($p, $rev, %revinfo);
 156                         push @revqueue, $p;
 157                 }
 158
 159
 160                 if (scalar @{$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 }
 170
 171
 172 sub git_rev_list {
 173         my ($rev, $file) = @_;
 174
 175         if ($rev_file) {
 176                 open(P, '<' . $rev_file);
 177         } else {
 178                 open(P,"-|","git-rev-list","--parents","--remove-empty",$rev,"--",$file)
 179                         or die "Failed to exec git-rev-list: $!";
 180         }
 181
 182         my @revs;
 183         while(my $line = <P>) {
 184                 chomp $line;
 185                 my ($rev, @parents) = split /\s+/, $line;
 186                 push @revs, [ $rev, @parents ];
 187         }
 188         close(P);
 189
 190         printf("0 revs found for rev %s (%s)\n", $rev, $file) if (@revs == 0);
 191         return @revs;
 192 }
 193
 194 sub find_parent_renames {
 195         my ($rev, $file) = @_;
 196
 197         open(P,"-|","git-diff-tree", "-M50", "-r","--name-status", "-z","$rev")
 198                 or die "Failed to exec git-diff: $!";
 199
 200         local $/ = "\0";
 201         my %bound;
 202         my $junk = <P>;
 203         while (my $change = <P>) {
 204                 chomp $change;
 205                 my $filename = <P>;
 206                 chomp $filename;
 207
 208                 if ($change =~ m/^[AMD]$/ ) {
 209                         next;
 210                 } elsif ($change =~ m/^R/ ) {
 211                         my $oldfilename = $filename;
 212                         $filename = <P>;
 213                         chomp $filename;
 214                         if ( $file eq $filename ) {
 215                                 my $parent = git_find_parent($rev, $oldfilename);
 216                                 @bound{'rev','filename'} = ($parent, $oldfilename);
 217                                 last;
 218                         }
 219                 }
 220         }
 221         close(P);
 222
 223         return \%bound;
 224 }
 225
 226
 227 sub git_find_parent {
 228         my ($rev, $filename) = @_;
 229
 230         open(REVPARENT,"-|","git-rev-list","--remove-empty", "--parents","--max-count=1","$rev","--",$filename)
 231                 or die "Failed to open git-rev-list to find a single parent: $!";
 232
 233         my $parentline = <REVPARENT>;
 234         chomp $parentline;
 235         my ($revfound,$parent) = split m/\s+/, $parentline;
 236
 237         close(REVPARENT);
 238
 239         return $parent;
 240 }
 241
 242
 243 # Get a diff between the current revision and a parent.
 244 # Record the commit information that results.
 245 sub git_diff_parse {
 246         my ($parent, $rev, %revinfo) = @_;
 247
 248         open(DIFF,"-|","git-diff-tree","-M","-p",$rev,$parent,"--",
 249                         $revs{$rev}{'filename'}, $revs{$parent}{'filename'})
 250                 or die "Failed to call git-diff for annotation: $!";
 251
 252         _git_diff_parse(*DIFF, $parent, $rev, %revinfo);
 253
 254         close(DIFF);
 255 }
 256
 257 sub _git_diff_parse {
 258         my ($diff, $parent, $rev, %revinfo) = @_;
 259
 260         my ($ri, $pi) = (0,0);
 261         my $slines = $revs{$rev}{'lines'};
 262         my @plines;
 263
 264         my $gotheader = 0;
 265         my ($remstart);
 266         my ($hunk_start, $hunk_index);
 267         while(<DIFF>) {
 268                 chomp;
 269                 if (m/^@@ -(\d+),(\d+) \+(\d+),(\d+)/) {
 270                         $remstart = $1;
 271                         # Adjust for 0-based arrays
 272                         $remstart--;
 273                         # Reinit hunk tracking.
 274                         $hunk_start = $remstart;
 275                         $hunk_index = 0;
 276                         $gotheader = 1;
 277
 278                         for (my $i = $ri; $i < $remstart; $i++) {
 279                                 $plines[$pi++] = $slines->[$i];
 280                                 $ri++;
 281                         }
 282                         next;
 283                 } elsif (!$gotheader) {
 284                         next;
 285                 }
 286
 287                 if (m/^\+(.*)$/) {
 288                         my $line = $1;
 289                         $plines[$pi++] = [ $line, '', '', '', 0 ];
 290                         next;
 291
 292                 } elsif (m/^-(.*)$/) {
 293                         my $line = $1;
 294                         if (get_line($slines, $ri) eq $line) {
 295                                 # Found a match, claim
 296                                 claim_line($ri, $rev, $slines, %revinfo);
 297                         } else {
 298                                 die sprintf("Sync error: %d/%d\n|%s\n|%s\n%s => %s\n",
 299                                                 $ri, $hunk_start + $hunk_index,
 300                                                 $line,
 301                                                 get_line($slines, $ri),
 302                                                 $rev, $parent);
 303                         }
 304                         $ri++;
 305
 306                 } else {
 307                         if (substr($_,1) ne get_line($slines,$ri) ) {
 308                                 die sprintf("Line %d (%d) does not match:\n|%s\n|%s\n%s => %s\n",
 309                                                 $hunk_start + $hunk_index, $ri,
 310                                                 substr($_,1),
 311                                                 get_line($slines,$ri),
 312                                                 $rev, $parent);
 313                         }
 314                         $plines[$pi++] = $slines->[$ri++];
 315                 }
 316                 $hunk_index++;
 317         }
 318         for (my $i = $ri; $i < @{$slines} ; $i++) {
 319                 push @plines, $slines->[$ri++];
 320         }
 321
 322         $revs{$parent}{lines} = \@plines;
 323         return;
 324 }
 325
 326 sub get_line {
 327         my ($lines, $index) = @_;
 328
 329         return ref $lines->[$index] ne '' ? $lines->[$index][0] : $lines->[$index];
 330 }
 331
 332 sub git_cat_file {
 333         my ($rev, $filename) = @_;
 334         return () unless defined $rev && defined $filename;
 335
 336         my $blob = git_ls_tree($rev, $filename);
 337
 338         open(C,"-|","git","cat-file", "blob", $blob)
 339                 or die "Failed to git-cat-file blob $blob (rev $rev, file $filename): " . $!;
 340
 341         my @lines;
 342         while(<C>) {
 343                 chomp;
 344                 push @lines, $_;
 345         }
 346         close(C);
 347
 348         return @lines;
 349 }
 350
 351 sub git_ls_tree {
 352         my ($rev, $filename) = @_;
 353
 354         open(T,"-|","git","ls-tree",$rev,$filename)
 355                 or die "Failed to call git ls-tree: $!";
 356
 357         my ($mode, $type, $blob, $tfilename);
 358         while(<T>) {
 359                 ($mode, $type, $blob, $tfilename) = split(/\s+/, $_, 4);
 360                 last if ($tfilename eq $filename);
 361         }
 362         close(T);
 363
 364         return $blob if $filename eq $filename;
 365         die "git-ls-tree failed to find blob for $filename";
 366
 367 }
 368
 369
 370
 371 sub claim_line {
 372         my ($floffset, $rev, $lines, %revinfo) = @_;
 373         my $oline = get_line($lines, $floffset);
 374         @{$lines->[$floffset]} = ( $oline, $rev,
 375                 $revinfo{'author'}, $revinfo{'author_date'} );
 376         #printf("Claiming line %d with rev %s: '%s'\n",
 377         #               $floffset, $rev, $oline) if 1;
 378 }
 379
 380 sub git_commit_info {
 381         my ($rev) = @_;
 382         open(COMMIT, "-|","git-cat-file", "commit", $rev)
 383                 or die "Failed to call git-cat-file: $!";
 384
 385         my %info;
 386         while(<COMMIT>) {
 387                 chomp;
 388                 last if (length $_ == 0);
 389
 390                 if (m/^author (.*) <(.*)> (.*)$/) {
 391                         $info{'author'} = $1;
 392                         $info{'author_email'} = $2;
 393                         $info{'author_date'} = $3;
 394                 } elsif (m/^committer (.*) <(.*)> (.*)$/) {
 395                         $info{'committer'} = $1;
 396                         $info{'committer_email'} = $2;
 397                         $info{'committer_date'} = $3;
 398                 }
 399         }
 400         close(COMMIT);
 401
 402         return %info;
 403 }
 404
 405 sub format_date {
 406         my ($timestamp, $timezone) = split(' ', $_[0]);
 407
 408         return strftime("%Y-%m-%d %H:%M:%S " . $timezone, gmtime($timestamp));
 409 }
 410
 411 # Copied from git-send-email.perl - We need a Git.pm module..
 412 sub gitvar {
 413     my ($var) = @_;
 414     my $fh;
 415     my $pid = open($fh, '-|');
 416     die "$!" unless defined $pid;
 417     if (!$pid) {
 418         exec('git-var', $var) or die "$!";
 419     }
 420     my ($val) = <$fh>;
 421     close $fh or die "$!";
 422     chomp($val);
 423     return $val;
 424 }
 425
 426 sub gitvar_name {
 427     my ($name) = @_;
 428     my $val = gitvar($name);
 429     my @field = split(/\s+/, $val);
 430     return join(' ', @field[0...(@field-4)]);
 431 }
 432