git-branch.sh

   1 #!/bin/sh
   2
   3 USAGE='[(-d | -D) <branchname>] | [[-f] <branchname> [<start-point>]]'
   4 LONG_USAGE='If no arguments, show available branches and mark current branch with a star.
   5 If one argument, create a new branch <branchname> based off of current HEAD.
   6 If two arguments, create a new branch <branchname> based off of <start-point>.'
   7
   8 SUBDIRECTORY_OK='Yes'
   9 . git-sh-setup
  10
  11 headref=$(git-symbolic-ref HEAD | sed -e 's|^refs/heads/||')
  12
  13 delete_branch () {
  14     option="$1"
  15     shift
  16     for branch_name
  17     do
  18         case ",$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 both.
  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 $branch_name."
  47     done
  48     exit 0
  49 }
  50
  51 force=
  52 while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
  53 do
  54         case "$1" in
  55         -d | -D)
  56                 delete_branch "$@"
  57                 exit
  58                 ;;
  59         -f)
  60                 force="$1"
  61                 ;;
  62         --)
  63                 shift
  64                 break
  65                 ;;
  66         -*)
  67                 usage
  68                 ;;
  69         esac
  70         shift
  71 done
  72
  73 case "$#" in
  74 0)
  75         git-rev-parse --symbolic --all |
  76         sed -ne 's|^refs/heads/||p' |
  77         sort |
  78         while read ref
  79         do
  80                 if test "$headref" = "$ref"
  81                 then
  82                         pfx='*'
  83                 else
  84                         pfx=' '
  85                 fi
  86                 echo "$pfx $ref"
  87         done
  88         exit 0 ;;
  89 1)
  90         head=HEAD ;;
  91 2)
  92         head="$2^0" ;;
  93 esac
  94 branchname="$1"
  95
  96 rev=$(git-rev-parse --verify "$head") || exit
  97
  98 git-check-ref-format "heads/$branchname" ||
  99         die "we do not like '$branchname' as a branch name."
 100
 101 if [ -e "$GIT_DIR/refs/heads/$branchname" ]
 102 then
 103         if test '' = "$force"
 104         then
 105                 die "$branchname already exists."
 106         elif test "$branchname" = "$headref"
 107         then
 108                 die "cannot force-update the current branch."
 109         fi
 110 fi
 111 git update-ref "refs/heads/$branchname" $rev