define die() for scripts that use it.
[git] / git-branch.sh
1 #!/bin/sh
2
3 GIT_DIR=`git-rev-parse --git-dir` || exit $?
4
5 die () {
6     echo >&2 "$*"
7     exit 1
8 }
9
10 usage () {
11     echo >&2 "usage: $(basename $0)"' [-d <branch>] | [[-f] <branch> [start-point]]
12
13 If no arguments, show available branches and mark current branch with a star.
14 If one argument, create a new branch <branchname> based off of current HEAD.
15 If two arguments, create a new branch <branchname> based off of <start-point>.
16 '
17     exit 1
18 }
19
20 headref=$(git-symbolic-ref HEAD | sed -e 's|^refs/heads/||')
21
22 delete_branch () {
23     option="$1"
24     shift
25     for branch_name
26     do
27         case ",$headref," in
28         ",$branch_name,")
29             die "Cannot delete the branch you are on." ;;
30         ,,)
31             die "What branch are you on anyway?" ;;
32         esac
33         branch=$(cat "$GIT_DIR/refs/heads/$branch_name") &&
34             branch=$(git-rev-parse --verify "$branch^0") ||
35                 die "Seriously, what branch are you talking about?"
36         case "$option" in
37         -D)
38             ;;
39         *)
40             mbs=$(git-merge-base -a "$branch" HEAD | tr '\012' ' ')
41             case " $mbs " in
42             *' '$branch' '*)
43                 # the merge base of branch and HEAD contains branch --
44                 # which means that the HEAD contains everything in the HEAD.
45                 ;;
46             *)
47                 echo >&2 "The branch '$branch_name' is not a strict subset of your current HEAD.
48     If you are sure you want to delete it, run 'git branch -D $branch_name'."
49                 exit 1
50                 ;;
51             esac
52             ;;
53         esac
54         rm -f "$GIT_DIR/refs/heads/$branch_name"
55         echo "Deleted branch $branch_name."
56     done
57     exit 0
58 }
59
60 force=
61 while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
62 do
63         case "$1" in
64         -d | -D)
65                 delete_branch "$@"
66                 exit
67                 ;;
68         -f)
69                 force="$1"
70                 ;;
71         --)
72                 shift
73                 break
74                 ;;
75         -*)
76                 usage
77                 ;;
78         esac
79         shift
80 done
81
82 case "$#" in
83 0)
84         git-rev-parse --symbolic --all |
85         sed -ne 's|^refs/heads/||p' |
86         sort |
87         while read ref
88         do
89                 if test "$headref" = "$ref"
90                 then
91                         pfx='*'
92                 else
93                         pfx=' '
94                 fi
95                 echo "$pfx $ref"
96         done
97         exit 0 ;;
98 1)
99         head=HEAD ;;
100 2)
101         head="$2^0" ;;
102 esac
103 branchname="$1"
104
105 rev=$(git-rev-parse --verify "$head") || exit
106
107 git-check-ref-format "heads/$branchname" ||
108         die "we do not like '$branchname' as a branch name."
109
110 if [ -e "$GIT_DIR/refs/heads/$branchname" ]
111 then
112         if test '' = "$force"
113         then
114                 die "$branchname already exists."
115         elif test "$branchname" = "$headref"
116         then
117                 die "cannot force-update the current branch."
118         fi
119 fi
120 git update-ref "refs/heads/$branchname" $rev