[PATCH 2/2] git-am: support StGit patch series

[Giuseppe Bilotta <giuseppe.bilotta@gmail.com>]

Stacked Git exports patch series with an 'index', a file containing
the list of the exported patches by filename. The file can be detected
by the '# This series applies on GIT commit somehash' header, and in
such a case git-am can replace its argument list with the list of files
taken from the index, proceeding then to import the whole series.

Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
---
 git-am.sh |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/git-am.sh b/git-am.sh
index 578780b..d65e3c1 100755
--- a/git-am.sh
+++ b/git-am.sh
@@ -274,6 +274,28 @@ else
 		done
 		shift
 	fi
+	# if a single argument was passed, check if it's a StGit patch series
+	# index by checking if the first line begins with '# This series'
+	if test $# = 1
+	then
+		read is_sharp is_this is_series is_therest < "$1"
+		if test x"$is_sharp $is_this $is_series" = 'x# This series'
+		then
+			# replace the argument list with the files listed
+			# in the series index, prefixing them with the
+			# series index dirname
+			series_dir=`dirname "$1"`
+			while read filename
+			do
+				set "$@" "$series_dir/$filename"
+			done < "$1"
+			# remove the series index name
+			shift
+			# and skip the first line of the series
+			# index, which was the comment
+			shift
+		fi
+	fi
 	git mailsplit -d"$prec" -o"$dotest" -b -- "$@" > "$dotest/last" ||  {
 		rm -fr "$dotest"
 		exit 1
-- 
1.6.3.1.212.g6c0d3.dirty