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>] | [<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 delete_branch () {
  16     option="$1"
  17     shift
  18     headref=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD |
  19                sed -e 's|^refs/heads/||')
  20     for branch_name
  21     do
  22         case ",$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 $branch_name."
  51     done
  52     exit 0
  53 }
  54
  55 while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
  56 do
  57         case "$1" in
  58         -d | -D)
  59                 delete_branch "$@"
  60                 exit
  61                 ;;
  62         --)
  63                 shift
  64                 break
  65                 ;;
  66         -*)
  67                 usage
  68                 ;;
  69         esac
  70         shift
  71 done
  72
  73 case "$#" in
  74 0)
  75         headref=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD |
  76                   sed -e 's|^refs/heads/||')
  77         git-rev-parse --symbolic --all |
  78         sed -ne 's|^refs/heads/||p' |
  79         sort |
  80         while read ref
  81         do
  82                 if test "$headref" = "$ref"
  83                 then
  84                         pfx='*'
  85                 else
  86                         pfx=' '
  87                 fi
  88                 echo "$pfx $ref"
  89         done
  90         exit 0 ;;
  91 1)
  92         head=HEAD ;;
  93 2)
  94         head="$2^0" ;;
  95 esac
  96 branchname="$1"
  97
  98 rev=$(git-rev-parse --verify "$head") || exit
  99
 100 [ -e "$GIT_DIR/refs/heads/$branchname" ] &&
 101         die "$branchname already exists."
 102 git-check-ref-format "heads/$branchname" ||
 103         die "we do not like '$branchname' as a branch name."
 104
 105 git update-ref "refs/heads/$branchname" $rev
 106