Git Status for Forks

gfstatus.sh

#!/usr/bin/env bash
set -o errexit
set -o nounset

repl() { printf "$1"'%.s' $(eval "echo {1.."$(($2))"}"); }

get_ahead() {
    git rev-list --count $1..$2
}

get_behind() {
    get_ahead $2 $1
}

echo_ahead() {
    if [ $1 -gt 0 ]; then
        echo "[ahead \033[32m$1\033[00m] "
    fi
}

echo_behind() {
    if [ $1 -gt 0 ]; then
        echo "[behind \033[31m$1\033[00m] "
    fi
}

remote_branch_line() {
    branch="$2"
    remote_branch="${1}/${branch}"
    if git branch -a | grep -q "${remote_branch}" ; then
        ahead=$(get_ahead ${remote_branch} ${branch})
        behind=$(get_behind ${remote_branch} ${branch})
        echo "$(repl ' ' ${#branch}+1)\033[31m${remote_branch}\033[00m $(echo_ahead ${ahead})$(echo_behind ${behind})"
    fi
}

current_branch="$(git rev-parse --abbrev-ref HEAD)"
origin_remote="$(git remote | sed -n 1p)"
upstream_remote="$(git remote | sed -n 2p)"

echo -e " $(remote_branch_line ${origin_remote} ${current_branch})"
echo -e " $(repl ' ' ${#current_branch})/"
echo -e " \033[32m${current_branch}\033[00m"
echo -e " $(repl ' ' ${#current_branch})\\"
echo -e " $(remote_branch_line ${upstream_remote} ${current_branch})"

Sample output...