Show status of the current branch vs. its remote tracking branch with `git rt`.

git-rt

#!/usr/bin/env bash

# Make this file executable: `chmod +x git-rt`.
# Then move it to a PATH directory to be able to run it as a Git subcommand (`git rt`).

set -eu

function status_val() {
    local property="${@:$#}" # last parameter
    local status_opts="${@:1:$#-1}" # all parameters except the last

    git status --porcelain=v2 "$status_opts" | grep -F "# ${property} " | sed -e "s/^# ${property} //"
}

# Text styles:
Rst='\e[0m'
Red='\e[0;31m'
Gre='\e[0;32m'
Pur='\e[0;35m'
Cya='\033[0;36m'

function out() {
    echo -e "$@"
}

function outn() {
    echo -e -n "$@"
}

function err() {
    echo -e "${Red}${@}${Rst}" >&2
}

branch="$(status_val --branch branch.head)"
upstream="$(status_val --branch branch.upstream)"

if [[ $branch = '(detached)' ]]
then
    err 'You are detached from your branch; aborting.'
    exit 1
fi

if [[ $upstream = '' ]]
then
    err 'No remote tracking branch; aborting.'
    exit 1
fi

outn "On ${Pur}${branch}${Rst}, but not ${Cya}${upstream}${Rst}: "
logs="$(git log --oneline --color=always "${upstream}..${branch}")"
if [[ $logs = '' ]]
then
    out "${Gre}clean${Rst}."
else
    out
    echo "$logs"
    out
fi

outn "On ${Cya}${upstream}${Rst}, but not ${Pur}${branch}${Rst}: "
logs="$(git log --oneline --color=always "${branch}..${upstream}")"
if [[ $logs = '' ]]
then
    out "${Gre}clean${Rst}."
else
    out
    echo "$logs"
fi