#!/bin/sh
#
# Copyright (c) 2005, 2006 Linus Torvalds and Junio C Hamano
#
setglobal USAGE = ''[--mixed | --soft | --hard]  [<commit-ish>] [ [--] <paths>...]''
setglobal SUBDIRECTORY_OK = 'Yes'
source git-sh-setup
set_reflog_action "reset $ifsjoin(Argv)"
require_work_tree

setglobal update = '', reset_type = '--mixed'
unset rev

while test $# != 0
{
	match $1 {
	with --mixed | --soft | --hard
		setglobal reset_type = $1
		
	with --
		break
		
	with -*
		usage
		
	with *
		setglobal rev = $[git rev-parse --verify $1] || exit
		shift
		break
		
	}
	shift
}

: $(rev=HEAD)
setglobal rev = $[git rev-parse --verify $rev^0] || exit

# Skip -- in "git reset HEAD -- foo" and "git reset -- foo".
match $1 { with -- shift  }

# git reset --mixed tree [--] paths... can be used to
# load chosen paths from the tree into the index without
# affecting the working tree or HEAD.
if test $Argc != 0
{
	test $reset_type = "--mixed" ||
		die "Cannot do partial $reset_type reset."

	git diff-index --cached $rev -- @Argv |
	sed -e 's/^:\([0-7][0-7]*\) [0-7][0-7]* \([0-9a-f][0-9a-f]*\) [0-9a-f][0-9a-f]* [A-Z]	\(.*\)$/\1 \2	\3/' |
	git update-index --add --remove --index-info || exit
	git update-index --refresh
	exit
}

cd_to_toplevel

if test $reset_type = "--hard"
{
	setglobal update = '-u'
}

# Soft reset does not touch the index file or the working tree
# at all, but requires them in a good order.  Other resets reset
# the index file to the tree object we are switching to.
if test $reset_type = "--soft"
{
	if test -f "$GIT_DIR/MERGE_HEAD" ||
	   test "" != $[git ls-files --unmerged]
	{
		die "Cannot do a soft reset in the middle of a merge."
	}
} else {
	git read-tree -v --reset $update $rev || exit
}

# Any resets update HEAD to the head being switched to.
if setglobal orig = $[git rev-parse --verify HEAD !2 >/dev/null]
{
	echo $orig >"$GIT_DIR/ORIG_HEAD"
} else {
	rm -f "$GIT_DIR/ORIG_HEAD"
}
git update-ref -m $GIT_REFLOG_ACTION HEAD $rev
setglobal update_ref_status = $Status

match $reset_type {
with --hard 
	test $update_ref_status = 0 && do {
		printf "HEAD is now at "
		env GIT_PAGER= git log --max-count=1 --pretty=oneline \
			--abbrev-commit HEAD
	}
	
with --soft 
	 # Nothing else to do
with --mixed 
	# Report what has not been updated.
	git update-index --refresh
	
}

rm -f "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/rr-cache/MERGE_RR" \
	"$GIT_DIR/SQUASH_MSG" "$GIT_DIR/MERGE_MSG"

exit $update_ref_status