GIT 0.99.9i aka 1.0rc2
[git] / git-branch.sh
1 #!/bin/sh
2
3 . git-sh-setup || die "Not a git archive"
4
5 usage () {
6     echo >&2 "usage: $(basename $0)"' [-d <branch>] | [<branch> [start-point]]
7
8 If no arguments, show available branches and mark current branch with a star.
9 If one argument, create a new branch <branchname> based off of current HEAD.
10 If two arguments, create a new branch <branchname> based off of <start-point>.
11 '
12     exit 1
13 }
14
15 delete_branch () {
16     option="$1"
17     shift
18     headref=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD |
19                sed -e 's|^refs/heads/||')
20     for branch_name
21     do
22         case ",$headref," in
23         ",$branch_name,")
24             die "Cannot delete the branch you are on." ;;
25         ,,)
26             die "What branch are you on anyway?" ;;
27         esac
28         branch=$(cat "$GIT_DIR/refs/heads/$branch_name") &&
29             branch=$(git-rev-parse --verify "$branch^0") ||
30                 die "Seriously, what branch are you talking about?"
31         case "$option" in
32         -D)
33             ;;
34         *)
35             mbs=$(git-merge-base -a "$branch" HEAD | tr '\012' ' ')
36             case " $mbs " in
37             *' '$branch' '*)
38                 # the merge base of branch and HEAD contains branch --
39                 # which means that the HEAD contains everything in the HEAD.
40                 ;;
41             *)
42                 echo >&2 "The branch '$branch_name' is not a strict subset of your current HEAD.
43     If you are sure you want to delete it, run 'git branch -D $branch_name'."
44                 exit 1
45                 ;;
46             esac
47             ;;
48         esac
49         rm -f "$GIT_DIR/refs/heads/$branch_name"
50         echo "Deleted branch $branch_name."
51     done
52     exit 0
53 }
54
55 while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
56 do
57         case "$1" in
58         -d | -D)
59                 delete_branch "$@"
60                 exit
61                 ;;
62         --)
63                 shift
64                 break
65                 ;;
66         -*)
67                 usage
68                 ;;
69         esac
70         shift
71 done
72
73 case "$#" in
74 0)
75         headref=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD |
76                   sed -e 's|^refs/heads/||')
77         git-rev-parse --symbolic --all |
78         sed -ne 's|^refs/heads/||p' |
79         sort |
80         while read ref
81         do
82                 if test "$headref" = "$ref"
83                 then
84                         pfx='*'
85                 else
86                         pfx=' '
87                 fi
88                 echo "$pfx $ref"
89         done
90         exit 0 ;;
91 1)
92         head=HEAD ;;
93 2)
94         head="$2^0" ;;
95 esac
96 branchname="$1"
97
98 rev=$(git-rev-parse --verify "$head") || exit
99
100 [ -e "$GIT_DIR/refs/heads/$branchname" ] &&
101         die "$branchname already exists."
102 git-check-ref-format "heads/$branchname" ||
103         die "we do not like '$branchname' as a branch name."
104
105 git update-ref "refs/heads/$branchname" $rev
106