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guilt: pop and delete tags

Add support for popping to a tag and the ability to delete
a tag while popping from the tree

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

---
 guilt-pop |   28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

--- a/guilt-pop
+++ b/guilt-pop
@@ -17,6 +17,13 @@ while [ $# -gt 0 ]; do
 		-n)
 			num=t
 			;;
+                -t|--t)
+                        tag=$2
+                        shift
+                        ;;
+	        -d|--d) # can only be used with --t
+                        delete_tag=t
+                        ;;
 		*)
 			break
 			;;
@@ -24,7 +31,7 @@ while [ $# -gt 0 ]; do
 	shift
 done
 
-# "guilt-pop" or "guilt-pop foo" or "guilt-pop -n foo"
+# "guilt-pop" or "guilt-pop foo" or "guilt-pop -n foo" or "guilt-pop -t <tag>"
 if [ -z "$all" ] && [ $# -gt 1 ]; then
 	usage
 fi
@@ -44,12 +51,26 @@ fi
 patch="$1"
 [ ! -z "$all" ] && patch="-a"
 
+
+# tag processing will just roll into another one of
+# the pop types, number or patch name
+if [ ! -z "$tag" ]; then
+        git-rev-list HEAD ^$tag > /dev/null 2>/dev/null
+	if [ $? -eq 0 ]; then
+	    revs="`git-rev-list HEAD ^$tag`"
+	    num=`echo "$revs" | wc -l`
+	    patch=$num
+	else
+	    echo "Cannot find tag $tag";
+	    exit 0
+        fi
+fi
+
 if [ ! -s "$applied" ]; then
 	disp "No patches applied."
 	exit 0
 elif [ "$patch" = "-a" ]; then
 	# we are supposed to pop all patches
-
 	sidx=`wc -l < $applied`
 	eidx=0
 elif [ ! -z "$num" ]; then
@@ -96,3 +117,6 @@ pop_many_patches `git rev-parse refs/pat
 p=`get_top`
 [ ! -z "$p" ] && disp "Now at $p." || disp "All patches popped."
 
+if [ ! -z "$delete_tag" ]; then
+	git tag -d $tag
+fi;