git-branch.sh

   1 #!/bin/sh
   2
   3 USAGE='[(-d | -D) <branchname>] | [[-f] <branchname> [<start-point>]] | -r'
   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 --branches |
  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