#!/bin/bash

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

log_file=../quilt-import.log
#cp /dev/null $log_file

log()
{
	echo "$@" | tee -a $log_file
}

execute()
{
	log "$" $@
	"$@" 2>&1 | tee -a $log_file
	[ ${PIPESTATUS[0]} -eq 0 ] || $SHELL -i || exit 1
}

cpwd=$(pwd)

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

for name in $quilters; do

	sfile="../quilt/$name/series"
	base=$(sed -n 's/^#[ \t]*NEXT[-_]BASE[ \t]*\([^ \t]*\)[ \t]*$/\1/p' "$sfile")
	if [ -n "$base" ]; then
		nbase=$(awk -F '\t' '/^[^#]/ && $3=="'"$base"'" { printf("%s/%s", "'"$base"'", $5); }' "$CTRL_FILE")
		[ -n "$nbase" ] && base="$nbase"
	else
		base=$(sed -n 's/^#[ \t]*BASE[ \t]*\(.*\)[ \t]*$/\1/p' "$sfile")
		[ -n "$base" ] || {
			# for stgit
			base=$(sed '1{s/^#.*GIT commit \(.*\)$/\1/;q}' "$sfile")
			[ -n "$base" ] ||
				base="origin/master"
		}
	fi
	rbase="$base"
	case "$base" in
	*-git[0-9]*)	rbase=$("$bin_dir/get_gitid" "${base}")
			;;
	commit*)	rbase=${base##commit*[[:space:]]}
			;;
	[0-9]*.*)	rbase="v$base"
			;;
	esac
	log "Importing $name based on $base"
	rbase_sha1=$(git rev-parse --verify "$rbase^{commit}") || {
		log "Unknown BASE"
		continue
	}

	# don't bother importing things that haven't changed
	mb=$(git merge-base "$rbase_sha1" "$name/master")
	change_size=$(cd ../quilt;git diff last_merge.. -- "$name/" | wc -c)
	[ "$mb" = "$rbase_sha1" ] && [ $change_size -eq 0 ] && {
		log "Unchanged quilt series $name"
		continue
	}

	sed_exp='s/[ \t]*#.*$//;/^[ \t]*$/!p'
	grep -q NEXT_PATCHES "$sfile" &&
		sed_exp='/NEXT_PATCHES_START/,/NEXT_PATCHES_END/{'"$sed_exp"';}'
	patches=$(sed -n "$sed_exp" "$sfile")

	git show-ref --quiet --verify "refs/heads/$name/master" ||
		execute git branch "$name/master" "$rbase_sha1"

	[ -n "$patches" ] || {
		log "	quilt series is empty"
		execute git branch -f "$name/master" "$rbase_sha1"
		continue
	}

	[ -d "../quilt-tmp" ] ||
		execute git clone -s -l -n -q . ../quilt-tmp

	log '$' cd ../quilt-tmp
	cd ../quilt-tmp
	execute git reset --hard "$rbase_sha1"

	for f in $patches; do
		old_head=$(git rev-parse --verify HEAD)
		execute git am -s --patch-format=mbox "../quilt/$name/$f"
		new_head=$(git rev-parse --verify HEAD)
		[ "$new_head" = "$old_head" ] && {
			echo "Tree unchanged, please check ..."
			bash -i || exit
		}
	done

	log '$' cd $cpwd
	cd $cpwd

	execute git fetch -f ../quilt-tmp master:"$name/master"
done

[ -d "../quilt-tmp" ] &&
	rm -rf ../quilt-tmp

( cd ../quilt; git branch -f last_merge HEAD )

exit 0