#!/bin/bash

pr_usage()
{
	echo "Usage: $0 [OPTION]... <revision range>"
	echo
	echo "OPTION"
	echo "  --reverse	Print in reverse"
	echo "  --stable	Print stable commits only"
	echo "	--cherry-pick	Cherry-pick the commits"
	echo "  --hash-only	Print hash only"
	echo "  --title-only	Print title only"
	echo "  -h, --help	Show this usage"
}

pr_usage_exit()
{
	exit_code=$1
	pr_usage
	exit "$exit_code"
}

if [ $# -lt 1 ]
then
	pr_usage_exit 1
fi

bindir=$(dirname "$0")

reverse="false"
stable="false"
cherry_pick="false"
hash_only="false"
title_only="false"

while [ $# -ne 0 ]
do
	case $1 in
	"--reverse")
		reverse="true"
		shift 1
		continue
		;;
	"--stable")
		stable="true"
		shift 1
		continue
		;;
	"--cherry-pick")
		cherry_pick="true"
		shift 1
		continue
		;;
	"--hash-only")
		hash_only="true"
		shift 1
		continue
		;;
	"--title-only")
		title_only="true"
		shift 1
		continue
		;;
	"--help" | "-h")
		pr_usage_exit 0
		;;
	*)
		if [ $# -ne 1 ]
		then
			pr_usage_exit 1
		fi
		revision_range=$1
		break;;
	esac
done

damon_files=$("$bindir/damon_source_files.py")

if [ "$cherry_pick" = "true" ]
then
	for commit in $(git log --pretty=%H --reverse $revision_range \
		-- $damon_files)
	do
		if ! git cherry-pick $commit
		then
			echo "cherry picking $commit failed"
			exit 1
		fi
	done
	exit 0
fi

pretty_option=""
if [ "$hash_only" = "true" ]
then
	pretty_option=" --pretty=%h"
elif [ "$title_only" = "true" ]
then
	pretty_option=" --pretty=%s"
else
	pretty_option=" --oneline"
fi

reverse_option=""
if [ "$reverse" = "true" ]
then
	reverse_option=" --reverse"
fi

if [ "$stable" = "true" ]
then
	for commit in $(git log --pretty=%H $reverse_option $revision_range \
		-- $damon_files)
	do
		if git show $commit --pretty=%b | grep "^Cc: " | \
			grep --quiet "stable"
		then
			git log -n 1 $pretty_option $commit
		fi
	done
	exit 0
fi

log_command="git log $revision_range $pretty_option $reverse_option"
log_command+=" -- $damon_files"

eval $log_command