#!/bin/bash

tools_dir=$(dirname "$0")
# shellcheck source=/dev/null
. "$tools_dir/common.sh" ''

if [ "$1" = '-n' ]; then
	shift
	last=$(tail -n1 "$SHA1_FILE" | cut -f1 -d$'\t')
	start_from=$(awk -F '\t' '/^[^#]/ && $3 == "'"$last"'" {
		do
			getline;
		while (/^#/ || $2 == "branch");
		print $3;
		exit 0;
	}' "$CTRL_FILE")
fi

if [ "$1" = '-s' ]; then
	shift
	start_from="$1"
	if [ -z "$start_from" ]; then
		printf '-s requires a start tree\n' 1>&2
		exit 1
	fi
	shift
fi

get_field()
{
	awk -F '\t' '/^[^#]/ && $3 == "'"$1"'" { print $'"$2"'; }' "$CTRL_FILE"
}

fetch_git()
{
	git fetch "$1"
}

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

trees="$*"
if ! [ "$trees" ]; then
	trees=$(awk -F '\t' '/^[^#]/ && $2 != "branch" { print $3 }' "$CTRL_FILE")
fi

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

	type=$(get_field "$name" 2)
	if ! [ "$type" ]; then
		printf '%s: unknown tree\n' "$name" 1>&2
		continue
	fi

	printf '%s: %s\n' "$name" "$type"
	fun="fetch_$type"
	tfun=$(type -t "$fun")
	if [ "$tfun" = 'function' ]; then
		"$fun" "$name"
	fi
done

exit 0