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="$2"
  17     headref=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD |
  18                sed -e 's|^refs/heads/||')
  19     case ",$headref," in
  20     ",$branch_name,")
  21         die "Cannot delete the branch you are on." ;;
  22     ,,)
  23         die "What branch are you on anyway?" ;;
  24     esac
  25     branch=$(cat "$GIT_DIR/refs/heads/$branch_name") &&
  26         branch=$(git-rev-parse --verify "$branch^0") ||
  27             die "Seriously, what branch are you talking about?"
  28     case "$option" in
  29     -D)
  30         ;;
  31     *)
  32         mbs=$(git-merge-base -a "$branch" HEAD | tr '\012' ' ')
  33         case " $mbs " in
  34         *' '$branch' '*)
  35             # the merge base of branch and HEAD contains branch --
  36             # which means that the HEAD contains everything in the HEAD.
  37             ;;
  38         *)
  39             echo >&2 "The branch '$branch_name' is not a strict subset of your current HEAD.
  40 If you are sure you want to delete it, run 'git branch -D $branch_name'."
  41             exit 1
  42             ;;
  43         esac
  44         ;;
  45     esac
  46     rm -f "$GIT_DIR/refs/heads/$branch_name"
  47     echo "Deleted branch $branch_name."
  48     exit 0
  49 }
  50
  51 while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
  52 do
  53         case "$1" in
  54         -d | -D)
  55                 delete_branch "$1" "$2"
  56                 exit
  57                 ;;
  58         --)
  59                 shift
  60                 break
  61                 ;;
  62         -*)
  63                 usage
  64                 ;;
  65         esac
  66         shift
  67 done
  68
  69 case "$#" in
  70 0)
  71         headref=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD |
  72                   sed -e 's|^refs/heads/||')
  73         git-rev-parse --symbolic --all |
  74         sed -ne 's|^refs/heads/||p' |
  75         sort |
  76         while read ref
  77         do
  78                 if test "$headref" = "$ref"
  79                 then
  80                         pfx='*'
  81                 else
  82                         pfx=' '
  83                 fi
  84                 echo "$pfx $ref"
  85         done
  86         exit 0 ;;
  87 1)
  88         head=HEAD ;;
  89 2)
  90         head="$2^0" ;;
  91 esac
  92 branchname="$1"
  93
  94 rev=$(git-rev-parse --verify "$head") || exit
  95
  96 [ -e "$GIT_DIR/refs/heads/$branchname" ] && die "$branchname already exists"
  97
  98 echo $rev > "$GIT_DIR/refs/heads/$branchname"