#!/bin/sh

test_description='diff whitespace error detection'

. ./test-lib.sh

test_expect_success setup '

        git config diff.color.whitespace "blue reverse" &&
        >F &&
        git add F &&
        echo "         Eight SP indent" >>F &&
        echo "  HT and SP indent" >>F &&
        echo "With trailing SP " >>F &&
        echo "Carriage ReturnQ" | tr Q "\015" >>F &&
        echo "No problem" >>F &&
        echo >>F

'

blue_grep='7;34m' ;# ESC [ 7 ; 3 4 m

printf "\033[%s" "$blue_grep" >check-grep
if (grep "$blue_grep" <check-grep | grep "$blue_grep") >/dev/null 2>&1
then
        grep_a=grep
elif (grep -a "$blue_grep" <check-grep | grep -a "$blue_grep") >/dev/null 2>&1
then
        grep_a='grep -a'
else
        grep_a=grep ;# expected to fail...
fi
rm -f check-grep

prepare_output () {
        git diff --color >output
        $grep_a "$blue_grep" output >error
        $grep_a -v "$blue_grep" output >normal
        return 0
}

test_expect_success default '

        prepare_output &&

        grep Eight normal >/dev/null &&
        grep HT error >/dev/null &&
        grep With error >/dev/null &&
        grep Return error >/dev/null &&
        grep No normal >/dev/null

'

test_expect_success 'without -trail' '

        git config core.whitespace -trail &&
        prepare_output &&

        grep Eight normal >/dev/null &&
        grep HT error >/dev/null &&
        grep With normal >/dev/null &&
        grep Return normal >/dev/null &&
        grep No normal >/dev/null

'

test_expect_success 'without -trail (attribute)' '

        test_might_fail git config --unset core.whitespace &&
        echo "F whitespace=-trail" >.gitattributes &&
        prepare_output &&

        grep Eight normal >/dev/null &&
        grep HT error >/dev/null &&
        grep With normal >/dev/null &&
        grep Return normal >/dev/null &&
        grep No normal >/dev/null

'

test_expect_success 'without -space' '

        rm -f .gitattributes &&
        git config core.whitespace -space &&
        prepare_output &&

        grep Eight normal >/dev/null &&
        grep HT normal >/dev/null &&
        grep With error >/dev/null &&
        grep Return error >/dev/null &&
        grep No normal >/dev/null

'

test_expect_success 'without -space (attribute)' '

        test_might_fail git config --unset core.whitespace &&
        echo "F whitespace=-space" >.gitattributes &&
        prepare_output &&

        grep Eight normal >/dev/null &&
        grep HT normal >/dev/null &&
        grep With error >/dev/null &&
        grep Return error >/dev/null &&
        grep No normal >/dev/null

'

test_expect_success 'with indent-non-tab only' '

        rm -f .gitattributes &&
        git config core.whitespace indent,-trailing,-space &&
        prepare_output &&

        grep Eight error >/dev/null &&
        grep HT normal >/dev/null &&
        grep With normal >/dev/null &&
        grep Return normal >/dev/null &&
        grep No normal >/dev/null

'

test_expect_success 'with indent-non-tab only (attribute)' '

        test_might_fail git config --unset core.whitespace &&
        echo "F whitespace=indent,-trailing,-space" >.gitattributes &&
        prepare_output &&

        grep Eight error >/dev/null &&
        grep HT normal >/dev/null &&
        grep With normal >/dev/null &&
        grep Return normal >/dev/null &&
        grep No normal >/dev/null

'

test_expect_success 'with cr-at-eol' '

        rm -f .gitattributes &&
        git config core.whitespace cr-at-eol &&
        prepare_output &&

        grep Eight normal >/dev/null &&
        grep HT error >/dev/null &&
        grep With error >/dev/null &&
        grep Return normal >/dev/null &&
        grep No normal >/dev/null

'

test_expect_success 'with cr-at-eol (attribute)' '

        test_might_fail git config --unset core.whitespace &&
        echo "F whitespace=trailing,cr-at-eol" >.gitattributes &&
        prepare_output &&

        grep Eight normal >/dev/null &&
        grep HT error >/dev/null &&
        grep With error >/dev/null &&
        grep Return normal >/dev/null &&
        grep No normal >/dev/null

'

test_expect_success 'trailing empty lines (1)' '

        rm -f .gitattributes &&
        test_must_fail git diff --check >output &&
        grep "new blank line at" output &&
        grep "trailing whitespace" output

'

test_expect_success 'trailing empty lines (2)' '

        echo "F -whitespace" >.gitattributes &&
        git diff --check >output &&
        ! test -s output

'

test_expect_success 'checkdiff shows correct line number for trailing blank lines' '

        printf "a\nb\n" > G &&
        git add G &&
        printf "x\nx\nx\na\nb\nc\n\n" > G &&
        [ "$(git diff --check -- G)" = "G:7: new blank line at EOF." ]

'

test_expect_success 'do not color trailing cr in context' '
        test_might_fail git config --unset core.whitespace &&
        rm -f .gitattributes &&
        echo AAAQ | tr Q "\015" >G &&
        git add G &&
        echo BBBQ | tr Q "\015" >>G &&
        git diff --color G | tr "\015" Q >output &&
        grep "BBB.*${blue_grep}Q" output &&
        grep "AAA.*\[mQ" output

'

test_expect_success 'color new trailing blank lines' '
        { echo a; echo b; echo; echo; } >x &&
        git add x &&
        { echo a; echo; echo; echo; echo c; echo; echo; echo; echo; } >x &&
        git diff --color x >output &&
        cnt=$($grep_a "${blue_grep}" output | wc -l) &&
        test $cnt = 2
'

test_done