X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=git-branch.sh;h=81b9e6cce138452ab50c1dee869b82a9f6706d34;hb=3d89cb4f3f5333d5eb5899352566ad071dbd0d0c;hp=145a7b783a75f17dd00ff3adf9ef52170195e688;hpb=215a7ad1ef790467a4cd3f0dcffbd6e5f04c38f7;p=git.git

diff --git a/git-branch.sh b/git-branch.sh
index 145a7b78..81b9e6cc 100755
--- a/git-branch.sh
+++ b/git-branch.sh
@@ -2,6 +2,16 @@
 
 . git-sh-setup || die "Not a git archive"
 
+usage () {
+    echo >&2 "usage: $(basename $0)"' [<branchname> [start-point]]
+
+If no arguments, show available branches and mark current branch with a star.
+If one argument, create a new branch <branchname> based off of current HEAD.
+If two arguments, create a new branch <branchname> based off of <start-point>.
+'
+    exit 1
+}
+
 case "$#" in
 0)
 	headref=$(readlink "$GIT_DIR/HEAD" | sed -e 's|^refs/heads/||')
@@ -25,6 +35,12 @@ case "$#" in
 	head="$2^0" ;;
 esac
 branchname="$1"
+
+case "$branchname" in
+-*)
+	usage;;
+esac
+
 rev=$(git-rev-parse --verify "$head") || exit
 
 [ -e "$GIT_DIR/refs/heads/$branchname" ] && die "$branchname already exists"