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, $src);
  32         chomp;
  33         s/^[0-9a-f]*    //;
  34         if (s/ of (.*)$//) {
  35                 $src = $1;
  36         } else {
  37                 # Pulling HEAD
  38                 $src = $_;
  39                 $_ = 'HEAD';
  40         }
  41         if (! exists $src{$src}) {
  42                 push @src, $src;
  43                 $src{$src} = {
  44                         BRANCH => [],
  45                         TAG => [],
  46                         GENERIC => [],
  47                         # &1 == has HEAD.
  48                         # &2 == has others.
  49                         HEAD_STATUS => 0,
  50                 };
  51         }
  52         if (/^branch (.*)$/) {
  53                 push @{$src{$src}{BRANCH}}, $1;
  54                 $src{$src}{HEAD_STATUS} |= 2;
  55         }
  56         elsif (/^tag (.*)$/) {
  57                 push @{$src{$src}{TAG}}, $1;
  58                 $src{$src}{HEAD_STATUS} |= 2;
  59         }
  60         elsif (/^HEAD$/) {
  61                 $src{$src}{HEAD_STATUS} |= 1;
  62         }
  63         else {
  64                 push @{$src{$src}{GENERIC}}, $_;
  65                 $src{$src}{HEAD_STATUS} |= 2;
  66         }
  67 }
  68
  69 my @msg;
  70 for my $src (@src) {
  71         if ($src{$src}{HEAD_STATUS} == 1) {
  72                 # Only HEAD is fetched, nothing else.
  73                 push @msg, $src;
  74                 next;
  75         }
  76         my @this;
  77         if ($src{$src}{HEAD_STATUS} == 3) {
  78                 # HEAD is fetched among others.
  79                 push @this, andjoin('', '', ['HEAD']);
  80         }
  81         push @this, andjoin("branch ", "branches ",
  82                            $src{$src}{BRANCH});
  83         push @this, andjoin("tag ", "tags ",
  84                            $src{$src}{TAG});
  85         push @this, andjoin("commit ", "commits ",
  86                             $src{$src}{GENERIC});
  87         my $this = join(', ', @this);
  88         if ($src ne '.') {
  89                 $this .= " from $src";
  90         }
  91         push @msg, $this;
  92 }
  93 print "Merge ", join("; ", @msg), "\n";