git-branch.sh

   1 #!/bin/sh
   2
   3 . git-sh-setup || die "Not a git archive"
   4
   5 usage () {
   6     echo >&2 "usage: $(basename $0)"' [-d <branch>] | [[-f] <branch> [start-point]]
   7
   8 If no arguments, show available branches and mark current branch with a star.
   9 If one argument, create a new branch <branchname> based off of current HEAD.
  10 If two arguments, create a new branch <branchname> based off of <start-point>.
  11 '
  12     exit 1
  13 }
  14
  15 headref=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD |
  16         sed -e 's|^refs/heads/||')
  17
  18 delete_branch () {
  19     option="$1"
  20     shift
  21     for branch_name
  22     do
  23         case ",$headref," in
  24         ",$branch_name,")
  25             die "Cannot delete the branch you are on." ;;
  26         ,,)
  27             die "What branch are you on anyway?" ;;
  28         esac
  29         branch=$(cat "$GIT_DIR/refs/heads/$branch_name") &&
  30             branch=$(git-rev-parse --verify "$branch^0") ||
  31                 die "Seriously, what branch are you talking about?"
  32         case "$option" in
  33         -D)
  34             ;;
  35         *)
  36             mbs=$(git-merge-base -a "$branch" HEAD | tr '\012' ' ')
  37             case " $mbs " in
  38             *' '$branch' '*)
  39                 # the merge base of branch and HEAD contains branch --
  40                 # which means that the HEAD contains everything in the HEAD.
  41                 ;;
  42             *)
  43                 echo >&2 "The branch '$branch_name' is not a strict subset of your current HEAD.
  44     If you are sure you want to delete it, run 'git branch -D $branch_name'."
  45                 exit 1
  46                 ;;
  47             esac
  48             ;;
  49         esac
  50         rm -f "$GIT_DIR/refs/heads/$branch_name"
  51         echo "Deleted branch $branch_name."
  52     done
  53     exit 0
  54 }
  55
  56 force=
  57 while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
  58 do
  59         case "$1" in
  60         -d | -D)
  61                 delete_branch "$@"
  62                 exit
  63                 ;;
  64         -f)
  65                 force="$1"
  66                 ;;
  67         --)
  68                 shift
  69                 break
  70                 ;;
  71         -*)
  72                 usage
  73                 ;;
  74         esac
  75         shift
  76 done
  77
  78 case "$#" in
  79 0)
  80         git-rev-parse --symbolic --all |
  81         sed -ne 's|^refs/heads/||p' |
  82         sort |
  83         while read ref
  84         do
  85                 if test "$headref" = "$ref"
  86                 then
  87                         pfx='*'
  88                 else
  89                         pfx=' '
  90                 fi
  91                 echo "$pfx $ref"
  92         done
  93         exit 0 ;;
  94 1)
  95         head=HEAD ;;
  96 2)
  97         head="$2^0" ;;
  98 esac
  99 branchname="$1"
 100
 101 rev=$(git-rev-parse --verify "$head") || exit
 102
 103 git-check-ref-format "heads/$branchname" ||
 104         die "we do not like '$branchname' as a branch name."
 105
 106 if [ -e "$GIT_DIR/refs/heads/$branchname" ]
 107 then
 108         if test '' = "$force"
 109         then
 110                 die "$branchname already exists."
 111         elif test "$branchname" = "$headref"
 112         then
 113                 die "cannot force-update the current branch."
 114         fi
 115 fi
 116 git update-ref "refs/heads/$branchname" $rev
 117