git-branch.sh

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