#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano
#

test_description='git apply in reverse

'

. ./test-lib.sh

test_expect_success setup '

        for i in a b c d e f g h i j k l m n; do echo $i; done >file1 &&
        perl -pe "y/ijk/\\000\\001\\002/" <file1 >file2 &&

        git add file1 file2 &&
        git commit -m initial &&
        git tag initial &&

        for i in a b c g h i J K L m o n p q; do echo $i; done >file1 &&
        perl -pe "y/mon/\\000\\001\\002/" <file1 >file2 &&

        git commit -a -m second &&
        git tag second &&

        git diff --binary initial second >patch

'

test_expect_success 'apply in forward' '

        T0=$(git rev-parse "second^{tree}") &&
        git reset --hard initial &&
        git apply --index --binary patch &&
        T1=$(git write-tree) &&
        test "$T0" = "$T1"
'

test_expect_success 'apply in reverse' '

        git reset --hard second &&
        git apply --reverse --binary --index patch &&
        git diff >diff &&
        test_cmp /dev/null diff

'

test_expect_success 'setup separate repository lacking postimage' '

        git archive --format=tar --prefix=initial/ initial | $TAR xf - &&
        (
                cd initial && git init && git add .
        ) &&

        git archive --format=tar --prefix=second/ second | $TAR xf - &&
        (
                cd second && git init && git add .
        )

'

test_expect_success 'apply in forward without postimage' '

        T0=$(git rev-parse "second^{tree}") &&
        (
                cd initial &&
                git apply --index --binary ../patch &&
                T1=$(git write-tree) &&
                test "$T0" = "$T1"
        )
'

test_expect_success 'apply in reverse without postimage' '

        T0=$(git rev-parse "initial^{tree}") &&
        (
                cd second &&
                git apply --index --binary --reverse ../patch &&
                T1=$(git write-tree) &&
                test "$T0" = "$T1"
        )
'

test_expect_success 'reversing a whitespace introduction' '
        sed "s/a/a /" < file1 > file1.new &&
        mv file1.new file1 &&
        git diff | git apply --reverse --whitespace=error
'

test_done