scripts/get_maintainer.pl

   1 #!/usr/bin/perl -w
   2 # (c) 2007, Joe Perches <joe@perches.com>
   3 #           created from checkpatch.pl
   4 #
   5 # Print selected MAINTAINERS information for
   6 # the files modified in a patch or for a file
   7 #
   8 # usage: perl scripts/get_maintainers.pl [OPTIONS] <patch>
   9 #        perl scripts/get_maintainers.pl [OPTIONS] -f <file>
  10 #
  11 # Licensed under the terms of the GNU GPL License version 2
  12
  13 use strict;
  14
  15 my $P = $0;
  16 my $V = '0.20';
  17
  18 use Getopt::Long qw(:config no_auto_abbrev);
  19
  20 my $lk_path = "./";
  21 my $email = 1;
  22 my $email_usename = 1;
  23 my $email_maintainer = 1;
  24 my $email_list = 1;
  25 my $email_subscriber_list = 0;
  26 my $email_git = 1;
  27 my $email_git_penguin_chiefs = 0;
  28 my $email_git_min_signatures = 1;
  29 my $email_git_max_maintainers = 5;
  30 my $email_git_min_percent = 5;
  31 my $email_git_since = "1-year-ago";
  32 my $email_git_blame = 0;
  33 my $email_remove_duplicates = 1;
  34 my $output_multiline = 1;
  35 my $output_separator = ", ";
  36 my $scm = 0;
  37 my $web = 0;
  38 my $subsystem = 0;
  39 my $status = 0;
  40 my $from_filename = 0;
  41 my $pattern_depth = 0;
  42 my $version = 0;
  43 my $help = 0;
  44
  45 my $exit = 0;
  46
  47 my @penguin_chief = ();
  48 push(@penguin_chief,"Linus Torvalds:torvalds\@linux-foundation.org");
  49 #Andrew wants in on most everything - 2009/01/14
  50 #push(@penguin_chief,"Andrew Morton:akpm\@linux-foundation.org");
  51
  52 my @penguin_chief_names = ();
  53 foreach my $chief (@penguin_chief) {
  54     if ($chief =~ m/^(.*):(.*)/) {
  55         my $chief_name = $1;
  56         my $chief_addr = $2;
  57         push(@penguin_chief_names, $chief_name);
  58     }
  59 }
  60 my $penguin_chiefs = "\(" . join("|",@penguin_chief_names) . "\)";
  61
  62 # rfc822 email address - preloaded methods go here.
  63 my $rfc822_lwsp = "(?:(?:\\r\\n)?[ \\t])";
  64 my $rfc822_char = '[\\000-\\377]';
  65
  66 if (!GetOptions(
  67                 'email!' => \$email,
  68                 'git!' => \$email_git,
  69                 'git-chief-penguins!' => \$email_git_penguin_chiefs,
  70                 'git-min-signatures=i' => \$email_git_min_signatures,
  71                 'git-max-maintainers=i' => \$email_git_max_maintainers,
  72                 'git-min-percent=i' => \$email_git_min_percent,
  73                 'git-since=s' => \$email_git_since,
  74                 'git-blame!' => \$email_git_blame,
  75                 'remove-duplicates!' => \$email_remove_duplicates,
  76                 'm!' => \$email_maintainer,
  77                 'n!' => \$email_usename,
  78                 'l!' => \$email_list,
  79                 's!' => \$email_subscriber_list,
  80                 'multiline!' => \$output_multiline,
  81                 'separator=s' => \$output_separator,
  82                 'subsystem!' => \$subsystem,
  83                 'status!' => \$status,
  84                 'scm!' => \$scm,
  85                 'web!' => \$web,
  86                 'pattern-depth=i' => \$pattern_depth,
  87                 'f|file' => \$from_filename,
  88                 'v|version' => \$version,
  89                 'h|help' => \$help,
  90                 )) {
  91     usage();
  92     die "$P: invalid argument\n";
  93 }
  94
  95 if ($help != 0) {
  96     usage();
  97     exit 0;
  98 }
  99
 100 if ($version != 0) {
 101     print("${P} ${V}\n");
 102     exit 0;
 103 }
 104
 105 if ($#ARGV < 0) {
 106     usage();
 107     die "$P: argument missing: patchfile or -f file please\n";
 108 }
 109
 110 if ($output_separator ne ", ") {
 111     $output_multiline = 0;
 112 }
 113
 114 my $selections = $email + $scm + $status + $subsystem + $web;
 115 if ($selections == 0) {
 116     usage();
 117     die "$P:  Missing required option: email, scm, status, subsystem or web\n";
 118 }
 119
 120 if ($email &&
 121     ($email_maintainer + $email_list + $email_subscriber_list +
 122      $email_git + $email_git_penguin_chiefs + $email_git_blame) == 0) {
 123     usage();
 124     die "$P: Please select at least 1 email option\n";
 125 }
 126
 127 if (!top_of_kernel_tree($lk_path)) {
 128     die "$P: The current directory does not appear to be "
 129         . "a linux kernel source tree.\n";
 130 }
 131
 132 ## Read MAINTAINERS for type/value pairs
 133
 134 my @typevalue = ();
 135 open(MAINT, "<${lk_path}MAINTAINERS") || die "$P: Can't open MAINTAINERS\n";
 136 while (<MAINT>) {
 137     my $line = $_;
 138
 139     if ($line =~ m/^(\C):\s*(.*)/) {
 140         my $type = $1;
 141         my $value = $2;
 142
 143         ##Filename pattern matching
 144         if ($type eq "F" || $type eq "X") {
 145             $value =~ s@\.@\\\.@g;       ##Convert . to \.
 146             $value =~ s/\*/\.\*/g;       ##Convert * to .*
 147             $value =~ s/\?/\./g;         ##Convert ? to .
 148             ##if pattern is a directory and it lacks a trailing slash, add one
 149             if ((-d $value)) {
 150                 $value =~ s@([^/])$@$1/@;
 151             }
 152         }
 153         push(@typevalue, "$type:$value");
 154     } elsif (!/^(\s)*$/) {
 155         $line =~ s/\n$//g;
 156         push(@typevalue, $line);
 157     }
 158 }
 159 close(MAINT);
 160
 161 my %mailmap;
 162
 163 if ($email_remove_duplicates) {
 164     open(MAILMAP, "<${lk_path}.mailmap") || warn "$P: Can't open .mailmap\n";
 165     while (<MAILMAP>) {
 166         my $line = $_;
 167
 168         next if ($line =~ m/^\s*#/);
 169         next if ($line =~ m/^\s*$/);
 170
 171         my ($name, $address) = parse_email($line);
 172         $line = format_email($name, $address);
 173
 174         next if ($line =~ m/^\s*$/);
 175
 176         if (exists($mailmap{$name})) {
 177             my $obj = $mailmap{$name};
 178             push(@$obj, $address);
 179         } else {
 180             my @arr = ($address);
 181             $mailmap{$name} = \@arr;
 182         }
 183     }
 184     close(MAILMAP);
 185 }
 186
 187 ## use the filenames on the command line or find the filenames in the patchfiles
 188
 189 my @files = ();
 190 my @range = ();
 191
 192 foreach my $file (@ARGV) {
 193     ##if $file is a directory and it lacks a trailing slash, add one
 194     if ((-d $file)) {
 195         $file =~ s@([^/])$@$1/@;
 196     } elsif (!(-f $file)) {
 197         die "$P: file '${file}' not found\n";
 198     }
 199     if ($from_filename) {
 200         push(@files, $file);
 201     } else {
 202         my $file_cnt = @files;
 203         my $lastfile;
 204         open(PATCH, "<$file") or die "$P: Can't open ${file}\n";
 205         while (<PATCH>) {
 206             if (m/^\+\+\+\s+(\S+)/) {
 207                 my $filename = $1;
 208                 $filename =~ s@^[^/]*/@@;
 209                 $filename =~ s@\n@@;
 210                 $lastfile = $filename;
 211                 push(@files, $filename);
 212             } elsif (m/^\@\@ -(\d+),(\d+)/) {
 213                 if ($email_git_blame) {
 214                     push(@range, "$lastfile:$1:$2");
 215                 }
 216             }
 217         }
 218         close(PATCH);
 219         if ($file_cnt == @files) {
 220             warn "$P: file '${file}' doesn't appear to be a patch.  "
 221                 . "Add -f to options?\n";
 222         }
 223         @files = sort_and_uniq(@files);
 224     }
 225 }
 226
 227 my @email_to = ();
 228 my @list_to = ();
 229 my @scm = ();
 230 my @web = ();
 231 my @subsystem = ();
 232 my @status = ();
 233
 234 # Find responsible parties
 235
 236 foreach my $file (@files) {
 237
 238 #Do not match excluded file patterns
 239
 240     my $exclude = 0;
 241     foreach my $line (@typevalue) {
 242         if ($line =~ m/^(\C):\s*(.*)/) {
 243             my $type = $1;
 244             my $value = $2;
 245             if ($type eq 'X') {
 246                 if (file_match_pattern($file, $value)) {
 247                     $exclude = 1;
 248                     last;
 249                 }
 250             }
 251         }
 252     }
 253
 254     if (!$exclude) {
 255         my $tvi = 0;
 256         my %hash;
 257         foreach my $line (@typevalue) {
 258             if ($line =~ m/^(\C):\s*(.*)/) {
 259                 my $type = $1;
 260                 my $value = $2;
 261                 if ($type eq 'F') {
 262                     if (file_match_pattern($file, $value)) {
 263                         my $value_pd = ($value =~ tr@/@@);
 264                         my $file_pd = ($file  =~ tr@/@@);
 265                         $value_pd++ if (substr($value,-1,1) ne "/");
 266                         if ($pattern_depth == 0 ||
 267                             (($file_pd - $value_pd) < $pattern_depth)) {
 268                             $hash{$tvi} = $value_pd;
 269                         }
 270                     }
 271                 }
 272             }
 273             $tvi++;
 274         }
 275         foreach my $line (sort {$hash{$b} <=> $hash{$a}} keys %hash) {
 276             add_categories($line);
 277         }
 278     }
 279
 280     if ($email && $email_git) {
 281         recent_git_signoffs($file);
 282     }
 283
 284     if ($email && $email_git_blame) {
 285         git_assign_blame($file);
 286     }
 287 }
 288
 289 if ($email) {
 290     foreach my $chief (@penguin_chief) {
 291         if ($chief =~ m/^(.*):(.*)/) {
 292             my $email_address;
 293
 294             $email_address = format_email($1, $2);
 295             if ($email_git_penguin_chiefs) {
 296                 push(@email_to, $email_address);
 297             } else {
 298                 @email_to = grep(!/${email_address}/, @email_to);
 299             }
 300         }
 301     }
 302 }
 303
 304 if ($email || $email_list) {
 305     my @to = ();
 306     if ($email) {
 307         @to = (@to, @email_to);
 308     }
 309     if ($email_list) {
 310         @to = (@to, @list_to);
 311     }
 312     output(uniq(@to));
 313 }
 314
 315 if ($scm) {
 316     @scm = uniq(@scm);
 317     output(@scm);
 318 }
 319
 320 if ($status) {
 321     @status = uniq(@status);
 322     output(@status);
 323 }
 324
 325 if ($subsystem) {
 326     @subsystem = uniq(@subsystem);
 327     output(@subsystem);
 328 }
 329
 330 if ($web) {
 331     @web = uniq(@web);
 332     output(@web);
 333 }
 334
 335 exit($exit);
 336
 337 sub file_match_pattern {
 338     my ($file, $pattern) = @_;
 339     if (substr($pattern, -1) eq "/") {
 340         if ($file =~ m@^$pattern@) {
 341             return 1;
 342         }
 343     } else {
 344         if ($file =~ m@^$pattern@) {
 345             my $s1 = ($file =~ tr@/@@);
 346             my $s2 = ($pattern =~ tr@/@@);
 347             if ($s1 == $s2) {
 348                 return 1;
 349             }
 350         }
 351     }
 352     return 0;
 353 }
 354
 355 sub usage {
 356     print <<EOT;
 357 usage: $P [options] patchfile
 358        $P [options] -f file|directory
 359 version: $V
 360
 361 MAINTAINER field selection options:
 362   --email => print email address(es) if any
 363     --git => include recent git \*-by: signers
 364     --git-chief-penguins => include ${penguin_chiefs}
 365     --git-min-signatures => number of signatures required (default: 1)
 366     --git-max-maintainers => maximum maintainers to add (default: 5)
 367     --git-min-percent => minimum percentage of commits required (default: 5)
 368     --git-since => git history to use (default: 1-year-ago)
 369     --git-blame => use git blame to find modified commits for patch or file
 370     --m => include maintainer(s) if any
 371     --n => include name 'Full Name <addr\@domain.tld>'
 372     --l => include list(s) if any
 373     --s => include subscriber only list(s) if any
 374     --remove-duplicates => minimize duplicate email names/addresses
 375   --scm => print SCM tree(s) if any
 376   --status => print status if any
 377   --subsystem => print subsystem name if any
 378   --web => print website(s) if any
 379
 380 Output type options:
 381   --separator [, ] => separator for multiple entries on 1 line
 382     using --separator also sets --nomultiline if --separator is not [, ]
 383   --multiline => print 1 entry per line
 384
 385 Other options:
 386   --pattern-depth => Number of pattern directory traversals (default: 0 (all))
 387   --version => show version
 388   --help => show this help information
 389
 390 Default options:
 391   [--email --git --m --n --l --multiline --pattern-depth=0 --remove-duplicates]
 392
 393 Notes:
 394   Using "-f directory" may give unexpected results:
 395       Used with "--git", git signators for _all_ files in and below
 396           directory are examined as git recurses directories.
 397           Any specified X: (exclude) pattern matches are _not_ ignored.
 398       Used with "--nogit", directory is used as a pattern match,
 399          no individual file within the directory or subdirectory
 400          is matched.
 401       Used with "--git-blame", does not iterate all files in directory
 402   Using "--git-blame" is slow and may add old committers and authors
 403       that are no longer active maintainers to the output.
 404 EOT
 405 }
 406
 407 sub top_of_kernel_tree {
 408         my ($lk_path) = @_;
 409
 410         if ($lk_path ne "" && substr($lk_path,length($lk_path)-1,1) ne "/") {
 411             $lk_path .= "/";
 412         }
 413         if (   (-f "${lk_path}COPYING")
 414             && (-f "${lk_path}CREDITS")
 415             && (-f "${lk_path}Kbuild")
 416             && (-f "${lk_path}MAINTAINERS")
 417             && (-f "${lk_path}Makefile")
 418             && (-f "${lk_path}README")
 419             && (-d "${lk_path}Documentation")
 420             && (-d "${lk_path}arch")
 421             && (-d "${lk_path}include")
 422             && (-d "${lk_path}drivers")
 423             && (-d "${lk_path}fs")
 424             && (-d "${lk_path}init")
 425             && (-d "${lk_path}ipc")
 426             && (-d "${lk_path}kernel")
 427             && (-d "${lk_path}lib")
 428             && (-d "${lk_path}scripts")) {
 429                 return 1;
 430         }
 431         return 0;
 432 }
 433
 434 sub parse_email {
 435     my ($formatted_email) = @_;
 436
 437     my $name = "";
 438     my $address = "";
 439
 440     if ($formatted_email =~ /^([^<]+)<(.+\@.*)>.*$/) {
 441         $name = $1;
 442         $address = $2;
 443     } elsif ($formatted_email =~ /^\s*<(.+\@\S*)>.*$/) {
 444         $address = $1;
 445     } elsif ($formatted_email =~ /^(.+\@\S*).*$/) {
 446         $address = $1;
 447     }
 448
 449     $name =~ s/^\s+|\s+$//g;
 450     $name =~ s/^\"|\"$//g;
 451     $address =~ s/^\s+|\s+$//g;
 452
 453     if ($name =~ /[^a-z0-9 \.\-]/i) {    ##has "must quote" chars
 454         $name =~ s/(?<!\\)"/\\"/g;       ##escape quotes
 455         $name = "\"$name\"";
 456     }
 457
 458     return ($name, $address);
 459 }
 460
 461 sub format_email {
 462     my ($name, $address) = @_;
 463
 464     my $formatted_email;
 465
 466     $name =~ s/^\s+|\s+$//g;
 467     $name =~ s/^\"|\"$//g;
 468     $address =~ s/^\s+|\s+$//g;
 469
 470     if ($name =~ /[^a-z0-9 \.\-]/i) {    ##has "must quote" chars
 471         $name =~ s/(?<!\\)"/\\"/g;       ##escape quotes
 472         $name = "\"$name\"";
 473     }
 474
 475     if ($email_usename) {
 476         if ("$name" eq "") {
 477             $formatted_email = "$address";
 478         } else {
 479             $formatted_email = "$name <${address}>";
 480         }
 481     } else {
 482         $formatted_email = $address;
 483     }
 484
 485     return $formatted_email;
 486 }
 487
 488 sub find_starting_index {
 489
 490     my ($index) = @_;
 491
 492     while ($index > 0) {
 493         my $tv = $typevalue[$index];
 494         if (!($tv =~ m/^(\C):\s*(.*)/)) {
 495             last;
 496         }
 497         $index--;
 498     }
 499
 500     return $index;
 501 }
 502
 503 sub find_ending_index {
 504     my ($index) = @_;
 505
 506     while ($index < @typevalue) {
 507         my $tv = $typevalue[$index];
 508         if (!($tv =~ m/^(\C):\s*(.*)/)) {
 509             last;
 510         }
 511         $index++;
 512     }
 513
 514     return $index;
 515 }
 516
 517 sub add_categories {
 518     my ($index) = @_;
 519
 520     my $i;
 521     my $start = find_starting_index($index);
 522     my $end = find_ending_index($index);
 523
 524     push(@subsystem, $typevalue[$start]);
 525
 526     for ($i = $start + 1; $i < $end; $i++) {
 527         my $tv = $typevalue[$i];
 528         if ($tv =~ m/^(\C):\s*(.*)/) {
 529             my $ptype = $1;
 530             my $pvalue = $2;
 531             if ($ptype eq "L") {
 532                 my $list_address = $pvalue;
 533                 my $list_additional = "";
 534                 if ($list_address =~ m/([^\s]+)\s+(.*)$/) {
 535                     $list_address = $1;
 536                     $list_additional = $2;
 537                 }
 538                 if ($list_additional =~ m/subscribers-only/) {
 539                     if ($email_subscriber_list) {
 540                         push(@list_to, $list_address);
 541                     }
 542                 } else {
 543                     if ($email_list) {
 544                         push(@list_to, $list_address);
 545                     }
 546                 }
 547             } elsif ($ptype eq "M") {
 548                 my ($name, $address) = parse_email($pvalue);
 549                 if ($name eq "") {
 550                     if ($i > 0) {
 551                         my $tv = $typevalue[$i - 1];
 552                         if ($tv =~ m/^(\C):\s*(.*)/) {
 553                             if ($1 eq "P") {
 554                                 $name = $2;
 555                                 $pvalue = format_email($name, $address);
 556                             }
 557                         }
 558                     }
 559                 }
 560                 if ($email_maintainer) {
 561                     push_email_addresses($pvalue);
 562                 }
 563             } elsif ($ptype eq "T") {
 564                 push(@scm, $pvalue);
 565             } elsif ($ptype eq "W") {
 566                 push(@web, $pvalue);
 567             } elsif ($ptype eq "S") {
 568                 push(@status, $pvalue);
 569             }
 570         }
 571     }
 572 }
 573
 574 my %email_hash_name;
 575 my %email_hash_address;
 576
 577 sub email_inuse {
 578     my ($name, $address) = @_;
 579
 580     return 1 if (($name eq "") && ($address eq ""));
 581     return 1 if (($name ne "") && exists($email_hash_name{$name}));
 582     return 1 if (($address ne "") && exists($email_hash_address{$address}));
 583
 584     return 0;
 585 }
 586
 587 sub push_email_address {
 588     my ($line) = @_;
 589
 590     my ($name, $address) = parse_email($line);
 591
 592     if ($address eq "") {
 593         return 0;
 594     }
 595
 596     if (!$email_remove_duplicates) {
 597         push(@email_to, format_email($name, $address));
 598     } elsif (!email_inuse($name, $address)) {
 599         push(@email_to, format_email($name, $address));
 600         $email_hash_name{$name}++;
 601         $email_hash_address{$address}++;
 602     }
 603
 604     return 1;
 605 }
 606
 607 sub push_email_addresses {
 608     my ($address) = @_;
 609
 610     my @address_list = ();
 611
 612     if (rfc822_valid($address)) {
 613         push_email_address($address);
 614     } elsif (@address_list = rfc822_validlist($address)) {
 615         my $array_count = shift(@address_list);
 616         while (my $entry = shift(@address_list)) {
 617             push_email_address($entry);
 618         }
 619     } else {
 620         if (!push_email_address($address)) {
 621             warn("Invalid MAINTAINERS address: '" . $address . "'\n");
 622         }
 623     }
 624 }
 625
 626 sub which {
 627     my ($bin) = @_;
 628
 629     foreach my $path (split(/:/, $ENV{PATH})) {
 630         if (-e "$path/$bin") {
 631             return "$path/$bin";
 632         }
 633     }
 634
 635     return "";
 636 }
 637
 638 sub mailmap {
 639     my @lines = @_;
 640     my %hash;
 641
 642     foreach my $line (@lines) {
 643         my ($name, $address) = parse_email($line);
 644         if (!exists($hash{$name})) {
 645             $hash{$name} = $address;
 646         } elsif ($address ne $hash{$name}) {
 647             $address = $hash{$name};
 648             $line = format_email($name, $address);
 649         }
 650         if (exists($mailmap{$name})) {
 651             my $obj = $mailmap{$name};
 652             foreach my $map_address (@$obj) {
 653                 if (($map_address eq $address) &&
 654                     ($map_address ne $hash{$name})) {
 655                     $line = format_email($name, $hash{$name});
 656                 }
 657             }
 658         }
 659     }
 660
 661     return @lines;
 662 }
 663
 664 sub recent_git_signoffs {
 665     my ($file) = @_;
 666
 667     my $sign_offs = "";
 668     my $cmd = "";
 669     my $output = "";
 670     my $count = 0;
 671     my @lines = ();
 672     my %hash;
 673     my $total_sign_offs;
 674
 675     if (which("git") eq "") {
 676         warn("$P: git not found.  Add --nogit to options?\n");
 677         return;
 678     }
 679     if (!(-d ".git")) {
 680         warn("$P: .git directory not found.  Use a git repository for better results.\n");
 681         warn("$P: perhaps 'git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git'\n");
 682         return;
 683     }
 684
 685     $cmd = "git log --since=${email_git_since} -- ${file}";
 686
 687     $output = `${cmd}`;
 688     $output =~ s/^\s*//gm;
 689
 690     @lines = split("\n", $output);
 691
 692     @lines = grep(/^[-_         a-z]+by:.*\@.*$/i, @lines);
 693     if (!$email_git_penguin_chiefs) {
 694         @lines = grep(!/${penguin_chiefs}/i, @lines);
 695     }
 696     # cut -f2- -d":"
 697     s/.*:\s*(.+)\s*/$1/ for (@lines);
 698
 699     $total_sign_offs = @lines;
 700
 701     if ($email_remove_duplicates) {
 702         @lines = mailmap(@lines);
 703     }
 704
 705     @lines = sort(@lines);
 706
 707     # uniq -c
 708     $hash{$_}++ for @lines;
 709
 710     # sort -rn
 711     foreach my $line (sort {$hash{$b} <=> $hash{$a}} keys %hash) {
 712         my $sign_offs = $hash{$line};
 713         $count++;
 714         last if ($sign_offs < $email_git_min_signatures ||
 715                  $count > $email_git_max_maintainers ||
 716                  $sign_offs * 100 / $total_sign_offs < $email_git_min_percent);
 717         push_email_address($line);
 718     }
 719 }
 720
 721 sub save_commits {
 722     my ($cmd, @commits) = @_;
 723     my $output;
 724     my @lines = ();
 725
 726     $output = `${cmd}`;
 727
 728     @lines = split("\n", $output);
 729     foreach my $line (@lines) {
 730         if ($line =~ m/^(\w+) /) {
 731             push (@commits, $1);
 732         }
 733     }
 734     return @commits;
 735 }
 736
 737 sub git_assign_blame {
 738     my ($file) = @_;
 739
 740     my @lines = ();
 741     my @commits = ();
 742     my $cmd;
 743     my $output;
 744     my %hash;
 745     my $total_sign_offs;
 746     my $count;
 747
 748     if (@range) {
 749         foreach my $file_range_diff (@range) {
 750             next if (!($file_range_diff =~ m/(.+):(.+):(.+)/));
 751             my $diff_file = $1;
 752             my $diff_start = $2;
 753             my $diff_length = $3;
 754             next if (!("$file" eq "$diff_file"));
 755             $cmd = "git blame -l -L $diff_start,+$diff_length $file";
 756             @commits = save_commits($cmd, @commits);
 757         }
 758     } else {
 759         if (-f $file) {
 760             $cmd = "git blame -l $file";
 761             @commits = save_commits($cmd, @commits);
 762         }
 763     }
 764
 765     $total_sign_offs = 0;
 766     @commits = uniq(@commits);
 767     foreach my $commit (@commits) {
 768         $cmd = "git log -1 ${commit}";
 769
 770         $output = `${cmd}`;
 771         $output =~ s/^\s*//gm;
 772         @lines = split("\n", $output);
 773
 774         @lines = grep(/^[-_     a-z]+by:.*\@.*$/i, @lines);
 775         if (!$email_git_penguin_chiefs) {
 776             @lines = grep(!/${penguin_chiefs}/i, @lines);
 777         }
 778
 779         # cut -f2- -d":"
 780         s/.*:\s*(.+)\s*/$1/ for (@lines);
 781
 782         $total_sign_offs += @lines;
 783
 784         if ($email_remove_duplicates) {
 785             @lines = mailmap(@lines);
 786         }
 787
 788         $hash{$_}++ for @lines;
 789     }
 790
 791     $count = 0;
 792     foreach my $line (sort {$hash{$b} <=> $hash{$a}} keys %hash) {
 793         my $sign_offs = $hash{$line};
 794         $count++;
 795         last if ($sign_offs < $email_git_min_signatures ||
 796                  $count > $email_git_max_maintainers ||
 797                  $sign_offs * 100 / $total_sign_offs < $email_git_min_percent);
 798         push_email_address($line);
 799     }
 800 }
 801
 802 sub uniq {
 803     my @parms = @_;
 804
 805     my %saw;
 806     @parms = grep(!$saw{$_}++, @parms);
 807     return @parms;
 808 }
 809
 810 sub sort_and_uniq {
 811     my @parms = @_;
 812
 813     my %saw;
 814     @parms = sort @parms;
 815     @parms = grep(!$saw{$_}++, @parms);
 816     return @parms;
 817 }
 818
 819 sub output {
 820     my @parms = @_;
 821
 822     if ($output_multiline) {
 823         foreach my $line (@parms) {
 824             print("${line}\n");
 825         }
 826     } else {
 827         print(join($output_separator, @parms));
 828         print("\n");
 829     }
 830 }
 831
 832 my $rfc822re;
 833
 834 sub make_rfc822re {
 835 #   Basic lexical tokens are specials, domain_literal, quoted_string, atom, and
 836 #   comment.  We must allow for rfc822_lwsp (or comments) after each of these.
 837 #   This regexp will only work on addresses which have had comments stripped
 838 #   and replaced with rfc822_lwsp.
 839
 840     my $specials = '()<>@,;:\\\\".\\[\\]';
 841     my $controls = '\\000-\\037\\177';
 842
 843     my $dtext = "[^\\[\\]\\r\\\\]";
 844     my $domain_literal = "\\[(?:$dtext|\\\\.)*\\]$rfc822_lwsp*";
 845
 846     my $quoted_string = "\"(?:[^\\\"\\r\\\\]|\\\\.|$rfc822_lwsp)*\"$rfc822_lwsp*";
 847
 848 #   Use zero-width assertion to spot the limit of an atom.  A simple
 849 #   $rfc822_lwsp* causes the regexp engine to hang occasionally.
 850     my $atom = "[^$specials $controls]+(?:$rfc822_lwsp+|\\Z|(?=[\\[\"$specials]))";
 851     my $word = "(?:$atom|$quoted_string)";
 852     my $localpart = "$word(?:\\.$rfc822_lwsp*$word)*";
 853
 854     my $sub_domain = "(?:$atom|$domain_literal)";
 855     my $domain = "$sub_domain(?:\\.$rfc822_lwsp*$sub_domain)*";
 856
 857     my $addr_spec = "$localpart\@$rfc822_lwsp*$domain";
 858
 859     my $phrase = "$word*";
 860     my $route = "(?:\@$domain(?:,\@$rfc822_lwsp*$domain)*:$rfc822_lwsp*)";
 861     my $route_addr = "\\<$rfc822_lwsp*$route?$addr_spec\\>$rfc822_lwsp*";
 862     my $mailbox = "(?:$addr_spec|$phrase$route_addr)";
 863
 864     my $group = "$phrase:$rfc822_lwsp*(?:$mailbox(?:,\\s*$mailbox)*)?;\\s*";
 865     my $address = "(?:$mailbox|$group)";
 866
 867     return "$rfc822_lwsp*$address";
 868 }
 869
 870 sub rfc822_strip_comments {
 871     my $s = shift;
 872 #   Recursively remove comments, and replace with a single space.  The simpler
 873 #   regexps in the Email Addressing FAQ are imperfect - they will miss escaped
 874 #   chars in atoms, for example.
 875
 876     while ($s =~ s/^((?:[^"\\]|\\.)*
 877                     (?:"(?:[^"\\]|\\.)*"(?:[^"\\]|\\.)*)*)
 878                     \((?:[^()\\]|\\.)*\)/$1 /osx) {}
 879     return $s;
 880 }
 881
 882 #   valid: returns true if the parameter is an RFC822 valid address
 883 #
 884 sub rfc822_valid ($) {
 885     my $s = rfc822_strip_comments(shift);
 886
 887     if (!$rfc822re) {
 888         $rfc822re = make_rfc822re();
 889     }
 890
 891     return $s =~ m/^$rfc822re$/so && $s =~ m/^$rfc822_char*$/;
 892 }
 893
 894 #   validlist: In scalar context, returns true if the parameter is an RFC822
 895 #              valid list of addresses.
 896 #
 897 #              In list context, returns an empty list on failure (an invalid
 898 #              address was found); otherwise a list whose first element is the
 899 #              number of addresses found and whose remaining elements are the
 900 #              addresses.  This is needed to disambiguate failure (invalid)
 901 #              from success with no addresses found, because an empty string is
 902 #              a valid list.
 903
 904 sub rfc822_validlist ($) {
 905     my $s = rfc822_strip_comments(shift);
 906
 907     if (!$rfc822re) {
 908         $rfc822re = make_rfc822re();
 909     }
 910     # * null list items are valid according to the RFC
 911     # * the '1' business is to aid in distinguishing failure from no results
 912
 913     my @r;
 914     if ($s =~ m/^(?:$rfc822re)?(?:,(?:$rfc822re)?)*$/so &&
 915         $s =~ m/^$rfc822_char*$/) {
 916         while ($s =~ m/(?:^|,$rfc822_lwsp*)($rfc822re)/gos) {
 917             push @r, $1;
 918         }
 919         return wantarray ? (scalar(@r), @r) : 1;
 920     }
 921     else {
 922         return wantarray ? () : 0;
 923     }
 924 }