git-branch.sh

   1 #!/bin/sh
   2
   3 USAGE='[-l] [(-d | -D) <branchname>] | [[-f] <branchname> [<start-point>]] | -r'
   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/logs/refs/heads/$branch_name"
  46         rm -f "$GIT_DIR/refs/heads/$branch_name"
  47         echo "Deleted branch $branch_name."
  48     done
  49     exit 0
  50 }
  51
  52 ls_remote_branches () {
  53     git-rev-parse --symbolic --all |
  54     sed -ne 's|^refs/\(remotes/\)|\1|p' |
  55     sort
  56 }
  57
  58 force=
  59 create_log=
  60 while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
  61 do
  62         case "$1" in
  63         -d | -D)
  64                 delete_branch "$@"
  65                 exit
  66                 ;;
  67         -r)
  68                 ls_remote_branches
  69                 exit
  70                 ;;
  71         -f)
  72                 force="$1"
  73                 ;;
  74         -l)
  75                 create_log="yes"
  76                 ;;
  77         --)
  78                 shift
  79                 break
  80                 ;;
  81         -*)
  82                 usage
  83                 ;;
  84         esac
  85         shift
  86 done
  87
  88 case "$#" in
  89 0)
  90         git-rev-parse --symbolic --branches |
  91         sort |
  92         while read ref
  93         do
  94                 if test "$headref" = "$ref"
  95                 then
  96                         pfx='*'
  97                 else
  98                         pfx=' '
  99                 fi
 100                 echo "$pfx $ref"
 101         done
 102         exit 0 ;;
 103 1)
 104         head=HEAD ;;
 105 2)
 106         head="$2^0" ;;
 107 esac
 108 branchname="$1"
 109
 110 rev=$(git-rev-parse --verify "$head") || exit
 111
 112 git-check-ref-format "heads/$branchname" ||
 113         die "we do not like '$branchname' as a branch name."
 114
 115 if [ -e "$GIT_DIR/refs/heads/$branchname" ]
 116 then
 117         if test '' = "$force"
 118         then
 119                 die "$branchname already exists."
 120         elif test "$branchname" = "$headref"
 121         then
 122                 die "cannot force-update the current branch."
 123         fi
 124 fi
 125 if test "$create_log" = 'yes'
 126 then
 127         mkdir -p $(dirname "$GIT_DIR/logs/refs/heads/$branchname")
 128         touch "$GIT_DIR/logs/refs/heads/$branchname"
 129 fi
 130 git update-ref -m "branch: Created from $head" "refs/heads/$branchname" $rev