bin/git-track

   1 #!/bin/sh
   2 ## Usage: git track
   3 ##        git track <branch>
   4 ## Point the current local branch at <branch> for the purpose
   5 ## of merge tracking, pull, and status features. With no <branch>,
   6 ## write the currently tracked branch to standard output.
   7 ##
   8 ## If you have git's bash-completion support enabled, add this:
   9 ## complete -o default -o nospace -F _git_checkout git-track
  10 set -e
  11
  12 # bail out with message to stderr and exit status 1
  13 die() {
  14     echo "$(basename $0):" "$@" 1>&2
  15     exit 1
  16 }
  17
  18 # deal with argv
  19 case "$1" in
  20   --help)
  21       grep '^##' "$0" | cut -c4-
  22       exit
  23       ;;
  24   "")
  25       remote=
  26       merge=
  27       ;;
  28   */*)
  29       git rev-parse "$1" >/dev/null
  30       remote=$(echo "$1" | sed 's@^\(.*\)/.*@\1@')
  31       merge=$(echo "$1"  | sed 's@^.*/\(.*\)@\1@')
  32       ;;
  33   *)
  34       git rev-parse "$1" >/dev/null
  35       remote=
  36       merge="$1"
  37       ;;
  38 esac
  39
  40 # get the current branch in refs/heads/<branch> form
  41 ref=$(git symbolic-ref -q HEAD)
  42 test -n "$ref" ||
  43 die "you're not on a branch"
  44
  45 # just the branch name please
  46 branch=$(echo "$ref" | sed 's@^refs/heads/@@')
  47 test -n "$branch" ||
  48 die "you're in a weird place; get on a local branch"
  49
  50 # if we don't have a target to track, show the
  51 # currently tracked stuff.
  52 test -z "$merge" && {
  53     remote=$(git config --get "branch.$branch.remote" || true)
  54     merge=$(
  55         (git config --get "branch.$branch.merge") |
  56         sed 's@refs/heads/@@'
  57     )
  58     if test -n "$remote" -a -n "$merge"; then
  59         echo "$branch -> $remote/$merge"
  60     elif test -n "$merge"; then
  61         echo "$branch -> $merge"
  62     else
  63         echo "$branch is not tracking anything"
  64     fi
  65     exit 0
  66 }
  67
  68 # set the remote if a full remote/branch ref was given
  69 test -n "$remote" &&
  70 git config "branch.$branch.remote" "$remote"
  71
  72 # set the ref in said remote we should track
  73 git config "branch.$branch.merge" "refs/heads/$merge"