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" branch_name="$2"
  17     headref=$(readlink "$GIT_DIR/HEAD" | sed -e 's|^refs/heads/||')
  18     case ",$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 the HEAD.
  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 $branch_name."
  47     exit 0
  48 }
  49
  50 while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
  51 do
  52         case "$1" in
  53         -d | -D)
  54                 delete_branch "$1" "$2"
  55                 exit
  56                 ;;
  57         --)
  58                 shift
  59                 break
  60                 ;;
  61         -*)
  62                 usage
  63                 ;;
  64         esac
  65         shift
  66 done
  67
  68 case "$#" in
  69 0)
  70         headref=$(readlink "$GIT_DIR/HEAD" | sed -e 's|^refs/heads/||')
  71         git-rev-parse --symbolic --all |
  72         sed -ne 's|^refs/heads/||p' |
  73         sort |
  74         while read ref
  75         do
  76                 if test "$headref" = "$ref"
  77                 then
  78                         pfx='*'
  79                 else
  80                         pfx=' '
  81                 fi
  82                 echo "$pfx $ref"
  83         done
  84         exit 0 ;;
  85 1)
  86         head=HEAD ;;
  87 2)
  88         head="$2^0" ;;
  89 esac
  90 branchname="$1"
  91
  92 rev=$(git-rev-parse --verify "$head") || exit
  93
  94 [ -e "$GIT_DIR/refs/heads/$branchname" ] && die "$branchname already exists"
  95
  96 echo $rev > "$GIT_DIR/refs/heads/$branchname"