1 files changed, 121 insertions, 0 deletions
diff --git a/git-branch.sh b/git-branch.sh
new file mode 100755
index 0000000000..663a3a370c
--- /dev/null
+++ b/git-branch.sh
@@ -0,0 +1,121 @@
+#!/bin/sh
+
+USAGE='[(-d | -D) <branchname>] | [[-f] <branchname> [<start-point>]]'
+LONG_USAGE='If no arguments, show available branches and mark current branch with a star.
+If one argument, create a new branch <branchname> based off of current HEAD.
+If two arguments, create a new branch <branchname> based off of <start-point>.'
+
+SUBDIRECTORY_OK='Yes'
+. git-sh-setup
+
+headref=$(git-symbolic-ref HEAD | sed -e 's|^refs/heads/||')
+
+delete_branch () {
+    option="$1"
+    shift
+    for branch_name
+    do
+	case ",$headref," in
+	",$branch_name,")
+	    die "Cannot delete the branch you are on." ;;
+	,,)
+	    die "What branch are you on anyway?" ;;
+	esac
+	branch=$(cat "$GIT_DIR/refs/heads/$branch_name") &&
+	    branch=$(git-rev-parse --verify "$branch^0") ||
+		die "Seriously, what branch are you talking about?"
+	case "$option" in
+	-D)
+	    ;;
+	*)
+	    mbs=$(git-merge-base -a "$branch" HEAD | tr '\012' ' ')
+	    case " $mbs " in
+	    *' '$branch' '*)
+		# the merge base of branch and HEAD contains branch --
+		# which means that the HEAD contains everything in both.
+		;;
+	    *)
+		echo >&2 "The branch '$branch_name' is not a strict subset of your current HEAD.
+If you are sure you want to delete it, run 'git branch -D $branch_name'."
+		exit 1
+		;;
+	    esac
+	    ;;
+	esac
+	rm -f "$GIT_DIR/refs/heads/$branch_name"
+	echo "Deleted branch $branch_name."
+    done
+    exit 0
+}
+
+ls_remote_branches () {
+    git-rev-parse --symbolic --all |
+    sed -ne 's|^refs/\(remotes/\)|\1|p' |
+    sort
+}
+
+force=
+while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
+do
+	case "$1" in
+	-d | -D)
+		delete_branch "$@"
+		exit
+		;;
+	-r)
+		ls_remote_branches
+		exit
+		;;
+	-f)
+		force="$1"
+		;;
+	--)
+		shift
+		break
+		;;
+	-*)
+		usage
+		;;
+	esac
+	shift
+done
+
+case "$#" in
+0)
+	git-rev-parse --symbolic --all |
+	sed -ne 's|^refs/heads/||p' |
+	sort |
+	while read ref
+	do
+		if test "$headref" = "$ref"
+		then
+			pfx='*'
+		else
+			pfx=' '
+		fi
+		echo "$pfx $ref"
+	done
+	exit 0 ;;
+1)
+	head=HEAD ;;
+2)
+	head="$2^0" ;;
+esac
+branchname="$1"
+
+rev=$(git-rev-parse --verify "$head") || exit
+
+git-check-ref-format "heads/$branchname" ||
+	die "we do not like '$branchname' as a branch name."
+
+if [ -e "$GIT_DIR/refs/heads/$branchname" ]
+then
+	if test '' = "$force"
+	then
+		die "$branchname already exists."
+	elif test "$branchname" = "$headref"
+	then
+		die "cannot force-update the current branch."
+	fi
+fi
+git update-ref "refs/heads/$branchname" $rev