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         ",$branch_name,")
  20             die "Cannot delete the branch you are on." ;;
  21         ,,)
  22             die "What branch are you on anyway?" ;;
  23         esac
  24         branch=$(git-show-ref --verify --hash -- "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 $branch_name'."
  40                 exit 1
  41                 ;;
  42             esac
  43             ;;
  44         esac
  45         git update-ref -d "refs/heads/$branch_name" "$branch"
  46         echo "Deleted branch $branch_name."
  47     done
  48     exit 0
  49 }
  50
  51 ls_remote_branches () {
  52     git-rev-parse --symbolic --all |
  53     sed -ne 's|^refs/\(remotes/\)|\1|p' |
  54     sort
  55 }
  56
  57 force=
  58 create_log=
  59 while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
  60 do
  61         case "$1" in
  62         -d | -D)
  63                 delete_branch "$@"
  64                 exit
  65                 ;;
  66         -r)
  67                 ls_remote_branches
  68                 exit
  69                 ;;
  70         -f)
  71                 force="$1"
  72                 ;;
  73         -l)
  74                 create_log="yes"
  75                 ;;
  76         --)
  77                 shift
  78                 break
  79                 ;;
  80         -*)
  81                 usage
  82                 ;;
  83         esac
  84         shift
  85 done
  86
  87 case "$#" in
  88 0)
  89         git-rev-parse --symbolic --branches |
  90         sort |
  91         while read ref
  92         do
  93                 if test "$headref" = "$ref"
  94                 then
  95                         pfx='*'
  96                 else
  97                         pfx=' '
  98                 fi
  99                 echo "$pfx $ref"
 100         done
 101         exit 0 ;;
 102 1)
 103         head=HEAD ;;
 104 2)
 105         head="$2^0" ;;
 106 esac
 107 branchname="$1"
 108
 109 rev=$(git-rev-parse --verify "$head") || exit
 110
 111 git-check-ref-format "heads/$branchname" ||
 112         die "we do not like '$branchname' as a branch name."
 113
 114 if [ -d "$GIT_DIR/refs/heads/$branchname" ]
 115 then
 116         for refdir in `cd "$GIT_DIR" && \
 117                 find "refs/heads/$branchname" -type d | sort -r`
 118         do
 119                 rmdir "$GIT_DIR/$refdir" || \
 120                     die "Could not delete '$refdir', there may still be a ref there."
 121         done
 122 fi
 123
 124 branchdir=$(dirname $branchname)
 125 while test "$branchdir" != "."
 126 do
 127         if git-show-ref --verify --quiet -- "refs/heads/$branchdir"
 128         then
 129                 die "$branchdir already exists."
 130         fi
 131         branchdir=$(dirname $branchdir)
 132 done
 133
 134 prev=''
 135 if git-show-ref --verify --quiet -- "refs/heads/$branchname"
 136 then
 137         if test '' = "$force"
 138         then
 139                 die "$branchname already exists."
 140         elif test "$branchname" = "$headref"
 141         then
 142                 die "cannot force-update the current branch."
 143         fi
 144         prev=`git rev-parse --verify "refs/heads/$branchname"`
 145 fi
 146 if test "$create_log" = 'yes'
 147 then
 148         mkdir -p $(dirname "$GIT_DIR/logs/refs/heads/$branchname")
 149         touch "$GIT_DIR/logs/refs/heads/$branchname"
 150 fi
 151 git update-ref -m "branch: Created from $head" "refs/heads/$branchname" "$rev" "$prev"