#!/usr/bin/env bash
#
# Reset the state of the working tree.
# Copyright (c) Petr Baudis, 2005
#
# Reverts the working tree to a consistent state before any changes to it
# (including merges etc.) were done. This command will rebuild the state
# of the tree according to the commit of .git/refs/heads/master, so if your
# working tree got into basically any inconsistent state, this will cure it.
#
# Basically, this is the opposite of `cg-commit` in some sense.
#
# This command is complementary to `cg-restore`, which only brings
# individual files in sync with their state at the time of the
# last commit.
#
# OPTIONS
# -------
# --adds-removes:: Only reset info about added and removed files
#	Reset ONLY the so-called "index" file. This effectively means that
#	any adds and removes you did will be unrecorded (but if you removed
#	the file physically as well, that will not be undone - run
#	'cg-restore' to restore it physically afterwards).

USAGE="cg-reset [--adds-removes]"
_git_requires_root=1

. "${COGITO_LIB}"cg-Xlib || exit 1
deprecated_alias cg-reset cg-cancel


indexonly=
while optparse; do
	if optparse --adds-removes; then
		indexonly=1
	else
		optfail
	fi
done

[ "${ARGS[0]}" ] && die "this command takes no parameters; use cg-restore to restore individual files"


if [ "$indexonly" ]; then
	( git-read-tree --reset HEAD ) && git-update-index --refresh
	exit
fi


if ! [ -s "$_git/HEAD" ]; then
	rm -f "$_git/HEAD"
	# XXX: git-symbolic-ref is a weenie and won't do the job at this point.
	echo "ref: refs/heads/$_git_head" >"$_git/HEAD"
fi

# Undo seek?
if [ -s "$_git/head-name" ]; then
	echo "Unseeking: $(cat "$_git/$(git-symbolic-ref HEAD)") -> $(cat "$_git/refs/heads/$_git_head") ($_git_head)"
	if [ -s "$_git/refs/heads/$_git_head" ]; then
		git-symbolic-ref HEAD "refs/heads/$_git_head"
		rm "$_git/refs/heads/cg-seek-point" "$_git/head-name"
	else
		echo "ERROR: Unknown branch $_git_head! Preserving HEAD." >&2
	fi
fi

rm -f "$_git/blocked" "$_git/merging" "$_git/merging-sym" "$_git/merge-base" "$_git/commit-ignore" "$_git/squashing"
git-read-tree --reset HEAD

git-checkout-index -u -f -a