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