#!/bin/bash
# Usage: git-branch-dates
# Show git branches by date - useful for showing active branches
# Inspired by:
# - http://www.commandlinefu.com/commands/view/2345/show-git-branches-by-date-useful-for-showing-active-branches
# - https://stackoverflow.com/a/30076212

format='%(HEAD) %(color:green)%(refname:short)%(color:reset)|%(color:bold black)%(committerdate:relative)%(color:reset)'
if [[ "$1" = "-v" || "$1" = "-vv" ]]; then
    shift
    format="$format"'|%(color:yellow)%(objectname:short)%(color:reset) %(contents:subject)'
fi

# For the `cut`-based line truncation handling below, since `cut` works based
# on chars/bytes and since the `git branch` will contain SGR escape sequences
# for coloring, predict how many "extra" bytes will be in each line due to the
# coloring in the `format` defined above.
extra_color_len=26

git branch \
    --color=always \
    --format="$format" \
    $* \
    | column -ts'|' \
    | cut -c 1-$(expr $(tput cols) + $extra_color_len)