git-review

#!/usr/bin/env bash

set -o errexit


git_log_format="%C(green)%h %C(red)%<(25,trunc)%ad %C(blue)%<(20,trunc)%aN%C(auto)%d %C(reset)%s"


function main() {
	local interactive=""
	local upstream=""
	local head=""

	while [ $# -gt 0 ]; do
		case "$1" in
		--help|-h)
			echo "Just read the source code: $0"
			shift
			return 0
			;;
		--interactive|--review-individual-commits|-i)
			interactive=1
			shift
			break
			;;
		--)
			shift
			break
			;;
		--*|-*)
			echo "Invalid option $1";
			shift
			return 1
			;;
		*)
			break
		esac

		shift
	done
	echo "$@"
	if [ $# -gt 2 ]; then
		echo "Usage: git review [options] [[upstream] branch_or_commit]"
		exit 1
	elif [[ $# -eq 2 ]]; then
		upstream="$1"
		head=${2:-$(git symbolic-ref --short HEAD)}
	else
		head=${1:-$(git symbolic-ref --short HEAD)}
		upstream=$(git rev-parse --short --symbolic-full-name "${head}@{upstream}")
		upstream=${upstream#refs/remotes/}
	fi

	declare -a revisions
	rev_range="${upstream}..${head}"
	echo "Reviewing: $rev_range"
	revisions=( $(git rev-list --topo-order --reverse "$rev_range") )
	if [ ${#revisions[@]} -eq 0 ]; then
		echo "Nothing to review"
		return 0
	fi
	echo
	git_log --graph --boundary --format="${git_log_format}%n" "$rev_range" --

	if [ "$interactive" ]; then
		echo
		echo "Showing diffs for each of the above commits one-by-one."
		echo

		for rev in ${revisions[@]}; do
			echo
			git_log --format="${git_log_format}" --stat "${rev}^!"

			echo
			confirm_run git difftool --dir-diff --no-prompt "$rev"~ "$rev"
		done
	else
		merge_base=$(git merge-base "$upstream" "$head")
		confirm_run git difftool --dir-diff --no-prompt "$merge_base" "$head"
	fi
}


function git_log() {
	git --no-pager log --date=iso8601 "$@"
}


function confirm_run() {
	printf "$ "; printf "%q " "$@"; echo
	read -p "Run command [Y]? " response
	case "$response" in
	y|Y|yes|Yes|YES|"")
		"$@"
		;;
	*)
		;;
	esac
}


main "$@"