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