patchNew script: git-changelog.perl - revised

diff --git a/contrib/git-changelog/git-changelog.perl
b/contrib/git-changelog/git-changelog.perl
new file mode 100755
index 0000000..bffa1ab
--- /dev/null
+++ b/contrib/git-changelog/git-changelog.perl
@@ -0,0 +1,68 @@
+#!/usr/bin/perl -w
+
+use strict;
+
+sub fetch_log {
+       my $command='git log --pretty=format:"%ai|%an|%h|%s" ';
+       foreach (@_) {
+               $command .= ' ' . $_;
+       }
+       $command .= " |";
+       my $fh;
+       open $fh, $command
+               or die "Failed to fetch logs";
+       # logs are presented as lines in which fields are separated by pipes.
+       # the fields are the date in ISO format (so the date as we
want it extends to the
+       # first space), the name of the author, the abbreviated SHA1
hash and the subject line
+       my $date_time;
+       my $date;
+       my $cruft;
+       my $author;
+       my $hash;
+       my $subject;
+       my $prev_date="";
+       my @cache; # a cache of the changes for the current date (i.e.
while $prev_date eq $date)
+       my %entry; # a cache entry; $entry{'author'} is the entry and
@$entry{'changes'} are the changes for the author in question
+       while (<$fh>) {
+               ($date_time, $author, $hash, $subject) = split(/\|/);
+               ($date, $cruft) = split(/\s/, $date_time, 2);
+               chomp $author;
+
+               if ($date ne $prev_date)
+               {
+                       foreach (@cache)
+                       {
+                               # print out the line with the date and
the author
+                               my $changes = $_->{'changes'};
+                               print "\n" . $prev_date . "\t" .
$_->{'author'} . "\n" if ($#{$changes} != -1);
+                               foreach (@{$changes})
+                               {
+                                       print "\t" . $_->{'hash'} . ':
' . $_->{'subject'};
+                               }
+                       }
+                       $prev_date = $date;
+                       @cache = ();
+               }
+               # try to find an entry with the same author in the cache
+               my $found = -1;
+               my $i;
+               for ($i = 0; $i <= $#cache && $found == -1; $i++)
+               {
+                       if ($cache[$i]->{'author'} eq $author)
+                       {
+                               $found = $i;
+                       }
+               }
+               if ($found == -1)
+               {
+                       my $changes = ();
+                       push @cache, { 'author', $author, 'changes', $changes };
+                       $found = $#cache;
+               }
+               push @{$cache[$found]->{'changes'}}, { 'hash', $hash,
'subject', $subject };
+       }
+}
+
+fetch_log @ARGV;
+
+