git-branch-status

#!/bin/bash
# hosted at   https://gist.github.com/Mark-Booth/5058384
# forked from https://gist.github.com/lth2h/4177524 @ ae184f1 by mark.booth
# forked from https://gist.github.com/jehiah/1288596 @ e357c1e by lth2h
# ideas from https://github.com/kortina/bakpak/blob/master/bin/git-branches-vs-origin-master

# this prints out some branch status
# (similar to the '... ahead' info you get from git status)
 
# example:
# $ git branch-status -a
# dns_check (ahead 1) | (behind 112) origin/master
# master (ahead 2) | (behind 0) origin/master
# $ git branch-status
# master (ahead 2) | (behind 0) origin/master

usage="$(basename "$0") [-hav] -- summarise status of branch(es)

where:
    -h  show this help text
    -a  show all branches, not just the current one
    -m  shows branch(es) with respect to origin/master
    -v  verbose, show output even if counts are zero"

while getopts 'hamv' option; do
  case "$option" in
    h) echo "$usage"
       exit
       ;;
    a) filter=refs/heads
       ;;
    m) originmaster=true
       ;;
    v) verbose=true
       ;;
    ?) printf "illegal option: '%s'\n" "$OPTARG" >&2
       echo "$usage" >&2
       exit 1
       ;;
  esac
done
shift $((OPTIND - 1))

if [ -z $filter ] ; then
    filter=$(git symbolic-ref -q HEAD)
fi

git for-each-ref --format="%(refname:short) %(upstream:short)" $filter | \
while read local remote
do
    if [ $originmaster ] ; then
        remote=origin/master
    fi
    [ -z "$remote" ] && continue
    DELTAS=$(git rev-list --left-right ${local}...${remote})
    LEFT_AHEAD=$(echo "$DELTAS" | grep -c '^<')
    RIGHT_AHEAD=$(echo "$DELTAS" | grep -c '^>')
    if [ $verbose ] || [ $LEFT_AHEAD -gt 0 ] || [ $RIGHT_AHEAD -gt 0 ] ; then
        echo "$local (ahead $LEFT_AHEAD) | (behind $RIGHT_AHEAD) $remote"
    fi
done