#!/bin/bash

. "$(dirname $0)/common.sh" ""

[ "$1" = "-n" ] && {
	shift
	last=$(tail -n1 $SHA1_FILE | cut -f1 -d$'\t')
	start_from=$(awk -F '\t' '$3 == "'$last'" { getline; print $3; exit 0; }' $CTRL_FILE)
}

[ "$1" = "-s" ] && {
	shift
	start_from="$1"
	[ -z "$start_from" ] && {
		echo "-s requires a start tree" 1>&2
		exit 1
	}
	shift
}

get_field()
{
	grep -v '^#' $CTRL_FILE |
		awk -F '\t' '$3 == "'$1'" { print $'$2'; }'
}

fetch_git()
{
	git fetch "$1"
}

fetch_mmotm()
{
	(
		cd ../mmotm || {
			echo "Cannot chdir to ../mmotm" 1>&2
			return
		}
		rsync -az --partial --exclude .git\* --exclude broken-out.tar.gz --delete ozlabs.org::akpm/mmotm/. . || {
			git reset --hard
			echo "Fetcing mmotm failed" 1>&2
			return
		}
		git add -A .
		[ "$(git status --porcelain)" ] &&
			git commit -m "$(head -n 1 .DATE)"
	)
}

fetch_quilt()
{
	(
		url=$(get_field "$1" 4)
		url=${url%/}	# strip trailing / if necessary

		cd ../quilt || {
			echo "Cannot chdir to ../quilt" 1>&2
			return
		}
		[ -d "$1" ] || mkdir "$1" || {
			echo "Cannot create quilt directory for $1" 1>&2
			return
		}
		cd "$1" || {
			echo "Cannot chdir to quilt directory for $1" 1>&2
			return
		}
		wget -N -nv --no-cache "$url/series" || {
			echo "Wget of $1 series file failed" 1>&2
			cd ..
			rm -rf "$1"
			git checkout "$1"
			return
		}
		find * -type f | grep -v '^series$' | sort >.series.old
		if grep -q NEXT_PATCHES series; then
			sed -n '/NEXT_PATCHES_START/,/NEXT_PATCHES_END/p' series
		else
			cat series
		fi |
			sed -e 's/[ \t]*#.*$//' -e '/^[ \t]*$/d' |
			sort >.series.next
		[ -s .series.next ] && {
			wget -N -nv --no-cache -B "$url/" -i .series.next || {
				echo "Wget of series '$1' failed" 1>&2
				cd ..
				rm -rf "$1"
				git checkout "$1"
				return
			}
		}
		comm -23 .series.old .series.next | xargs -r rm -f
		rm -f .series.old .series.next
		setfattr -x user.xdg.origin.url * >/dev/null 2>&1
	)
}

trees="$@"
[ "$trees" ] ||
	trees=$(grep -v '^#' $CTRL_FILE | awk -F '\t' '{ print $3 }')

for name in $trees; do
	[ -n "$start_from" ] && {
		if [ "$name" = "$start_from" ]; then
			start_from=""
		else
			continue
		fi
	}

	type=$(get_field "$name" 2)

	echo $name: $type
	[ $(type -t "fetch_$type") = "function" ] &&
		fetch_$type "$name"
done

cd ../quilt
git add -A .
[ "$(git status --porcelain)" ] &&
	git commit -v -a -m "$(date '+%F-%H:%M')" -e

exit 0