guilt-split

#!/bin/sh
#
# Copyright (c) Viacheslav Galaktionov, 2023
#

USAGE="[toolname] [<patchname>]"
if [ -z "$GUILT_VERSION" ]; then
	echo "Invoking `basename "$0"` directly is no longer supported." >&2
	exit 1
fi

_main() {

SPLIT_TOOL="$GUILT_SPLIT_TOOL"

case $# in
	0)
		patch=`get_top`
		;;
	1)
		patch="$1"
		;;
	2)
		SPLIT_TOOL="$1"
		patch="$2"
		;;
esac

[ -z "$patch" ] && die "No patch specified."
[ -z "$SPLIT_TOOL" ] && die "No splitting tool specified."

# make sure that there are no unapplied changes
if ! must_commit_first; then
	die "Uncommited changes detected. Refresh first."
fi

# check that patch exists in the series
TMP_FULL_SERIES=`get_tmp_file series`
get_full_series > "$TMP_FULL_SERIES"
found_patch=
while read x; do
	if [ "$x" = "$patch" ]; then
		found_patch="$patch"
		break
	fi
done < "$TMP_FULL_SERIES"

if [ -z "$found_patch" ]; then
	TMP_MATCHES=`get_tmp_file series`
	grep "$patch" < "$TMP_FULL_SERIES" > "$TMP_MATCHES"
	nr=`wc -l < $TMP_MATCHES`
	if [ $nr -gt 1 ]; then
		echo "$patch does not uniquely identify a patch. Did you mean any of these?" >&2
		sed 's/^/  /' "$TMP_MATCHES" >&2
		rm -f "$TMP_MATCHES" "$TMP_FULL_SERIES"
		exit 1
	elif [ $nr -eq 0 ]; then
		rm -f "$TMP_MATCHES" "$TMP_FULL_SERIES"
		die "Patch $patch is not in the series"
	fi
	found_patch=`cat $TMP_MATCHES`
	rm -f "$TMP_MATCHES"
fi
patch="$found_patch"

if grep -x "$patch" "$applied"; then
	last_top=`get_top`
	guilt pop "$patch"
fi

TMP_MSG=`get_tmp_file msg`
TMP_DIFF=`get_tmp_file diff`
TMP_NEW_SERIES=`get_tmp_file new_series`

# TODO preserve original patch's guards
do_get_full_header "$GUILT_DIR/$branch/$patch" > "$TMP_MSG"
do_get_patch "$GUILT_DIR/$branch/$patch" > "$TMP_DIFF"

toppatch="$patch"

"$SPLIT_TOOL" "$TMP_DIFF" > "$TMP_NEW_SERIES" || die "Split tool failed"

mv "$GUILT_DIR/$branch/$patch" "$GUILT_DIR/$branch/$patch~"

while read patchfile mark; do
	last_mark="$mark"
	if [ "$mark" = "." ]; then
		last_mark="$patch"
		cat "$TMP_MSG" "$patchfile" > "$GUILT_DIR/$branch/$patch"
		rm "$patchfile"
		toppatch=`grep "$patch" -A1 < "$TMP_FULL_SERIES" | tail -1`
		[ "$toppatch" = "$patch" ] && toppatch=""
	else
		newname="$GUILT_DIR/$branch/$mark"
		# TODO better error handling
		[ -e "$newname" ] && die "Patch $mark already exists"

		mv "$patchfile" "$newname"
		series_insert_patch_before "$mark" "$toppatch"
	fi
done < "$TMP_NEW_SERIES"

rm -f "$TMP_MSG" "$TMP_DIFF"
rm -f "$TMP_FULL_SERIES"
rm -f "$TMP_NEW_SERIES"

if [ -n "$last_top" ]; then
    if [ "$last_top" = "$patch" ]; then
        guilt push "$last_mark"
    else
        guild push "$last_top"
    fi
fi

}