git_branch_status

#!/usr/bin/env bash
# by http://github.com/jehiah
# this prints out some branch status (similar to the '... ahead' info you get from git status)

# example:
# $ git branch-status
# dns_check (ahead 1) | (behind 112) origin/master
# master    (ahead 2) | (behind   0) origin/master

declare -a local_branches

while read -r local remote
do
    if [ -z "$remote" ]
    then
        local_branches+=("$local")
        continue
    fi
    git rev-list --left-right "${local}"..."${remote}" -- 2>/dev/null >/tmp/git_upstream_status_delta || continue
    AHEAD=$(grep -c '^<' /tmp/git_upstream_status_delta)
    BEHIND=$(grep -c '^>' /tmp/git_upstream_status_delta)
    printf '%30s \x1b[33m(ahead %2s) \x1b[0m| \x1b[34m(behind %3s) \x1b[32m%s\x1b[0m\n' "$local" "$AHEAD" "$BEHIND" "$remote"
done < <(git for-each-ref --format="%(refname:short) %(upstream:short)" refs/heads)

for branch in "${local_branches[@]}"
do
    printf '%s only exists locally\n' "$branch"
done