git-fmt-merge-msg.perl

   1 #!/usr/bin/perl -w
   2 #
   3 # Copyright (c) 2005 Junio C Hamano
   4 #
   5 # Read .git/FETCH_HEAD and make a human readable merge message
   6 # by grouping branches and tags together to form a single line.
   7
   8 use strict;
   9
  10 my @src;
  11 my %src;
  12 sub andjoin {
  13         my ($label, $labels, $stuff) = @_;
  14         my $l = scalar @$stuff;
  15         my $m = '';
  16         if ($l == 0) {
  17                 return ();
  18         }
  19         if ($l == 1) {
  20                 $m = "$label$stuff->[0]";
  21         }
  22         else {
  23                 $m = ("$labels" .
  24                       join (', ', @{$stuff}[0..$l-2]) .
  25                       " and $stuff->[-1]");
  26         }
  27         return ($m);
  28 }
  29
  30 while (<>) {
  31         my ($bname, $tname, $gname, $src);
  32         chomp;
  33         s/^[0-9a-f]*    //;
  34         next if (/^not-for-merge/);
  35         s/^     //;
  36         if (s/ of (.*)$//) {
  37                 $src = $1;
  38         } else {
  39                 # Pulling HEAD
  40                 $src = $_;
  41                 $_ = 'HEAD';
  42         }
  43         if (! exists $src{$src}) {
  44                 push @src, $src;
  45                 $src{$src} = {
  46                         BRANCH => [],
  47                         TAG => [],
  48                         GENERIC => [],
  49                         # &1 == has HEAD.
  50                         # &2 == has others.
  51                         HEAD_STATUS => 0,
  52                 };
  53         }
  54         if (/^branch (.*)$/) {
  55                 push @{$src{$src}{BRANCH}}, $1;
  56                 $src{$src}{HEAD_STATUS} |= 2;
  57         }
  58         elsif (/^tag (.*)$/) {
  59                 push @{$src{$src}{TAG}}, $1;
  60                 $src{$src}{HEAD_STATUS} |= 2;
  61         }
  62         elsif (/^HEAD$/) {
  63                 $src{$src}{HEAD_STATUS} |= 1;
  64         }
  65         else {
  66                 push @{$src{$src}{GENERIC}}, $_;
  67                 $src{$src}{HEAD_STATUS} |= 2;
  68         }
  69 }
  70
  71 my @msg;
  72 for my $src (@src) {
  73         if ($src{$src}{HEAD_STATUS} == 1) {
  74                 # Only HEAD is fetched, nothing else.
  75                 push @msg, $src;
  76                 next;
  77         }
  78         my @this;
  79         if ($src{$src}{HEAD_STATUS} == 3) {
  80                 # HEAD is fetched among others.
  81                 push @this, andjoin('', '', ['HEAD']);
  82         }
  83         push @this, andjoin("branch ", "branches ",
  84                            $src{$src}{BRANCH});
  85         push @this, andjoin("tag ", "tags ",
  86                            $src{$src}{TAG});
  87         push @this, andjoin("commit ", "commits ",
  88                             $src{$src}{GENERIC});
  89         my $this = join(', ', @this);
  90         if ($src ne '.') {
  91                 $this .= " of $src";
  92         }
  93         push @msg, $this;
  94 }
  95 print "Merge ", join("; ", @msg), "\n";