git/git-branch.sh

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#!/bin/sh
. git-sh-setup || die "Not a git archive"
usage () {
echo >&2 "usage: $(basename $0)"' [-d <branch>] | [<branch> [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
}
delete_branch () {
option="$1" branch_name="$2"
headref=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD |
sed -e 's|^refs/heads/||')
case ",$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 the HEAD.
;;
*)
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 $branch_name."
exit 0
}
while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
do
case "$1" in
-d | -D)
delete_branch "$1" "$2"
exit
;;
--)
shift
break
;;
-*)
usage
;;
esac
shift
done
case "$#" in
0)
headref=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD |
sed -e 's|^refs/heads/||')
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 "$head") || exit
[ -e "$GIT_DIR/refs/heads/$branchname" ] && die "$branchname already exists"
echo $rev > "$GIT_DIR/refs/heads/$branchname"