#!/bin/sh

test_description='core.whitespace rules and git apply'

. ./test-lib.sh

prepare_test_file () {

        # A line that has character X is touched iff RULE is in effect:
        #       X  RULE
        #       !  trailing-space
        #       @  space-before-tab
        #       #  indent-with-non-tab
        #       %  tab-in-indent
        sed -e "s/_/ /g" -e "s/>/       /" <<-\EOF
                An_SP in an ordinary line>and a HT.
                >A HT (%).
                _>A SP and a HT (@%).
                _>_A SP, a HT and a SP (@%).
                _______Seven SP.
                ________Eight SP (#).
                _______>Seven SP and a HT (@%).
                ________>Eight SP and a HT (@#%).
                _______>_Seven SP, a HT and a SP (@%).
                ________>_Eight SP, a HT and a SP (@#%).
                _______________Fifteen SP (#).
                _______________>Fifteen SP and a HT (@#%).
                ________________Sixteen SP (#).
                ________________>Sixteen SP and a HT (@#%).
                _____a__Five SP, a non WS, two SP.
                A line with a (!) trailing SP_
                A line with a (!) trailing HT>
        EOF
}

apply_patch () {
        >target &&
        sed -e "s|\([ab]\)/file|\1/target|" <patch |
        git apply "$@"
}

test_fix () {
        # fix should not barf
        apply_patch --whitespace=fix || return 1

        # find touched lines
        diff file target | sed -n -e "s/^> //p" >fixed

        # the changed lines are all expeced to change
        fixed_cnt=$(wc -l <fixed)
        case "$1" in
        '') expect_cnt=$fixed_cnt ;;
        ?*) expect_cnt=$(grep "[$1]" <fixed | wc -l) ;;
        esac
        test $fixed_cnt -eq $expect_cnt || return 1

        # and we are not missing anything
        case "$1" in
        '') expect_cnt=0 ;;
        ?*) expect_cnt=$(grep "[$1]" <file | wc -l) ;;
        esac
        test $fixed_cnt -eq $expect_cnt || return 1

        # Get the patch actually applied
        git diff-files -p target >fixed-patch
        test -s fixed-patch && return 0

        # Make sure it is complaint-free
        >target
        git apply --whitespace=error-all <fixed-patch

}

test_expect_success setup '

        >file &&
        git add file &&
        prepare_test_file >file &&
        git diff-files -p >patch &&
        >target &&
        git add target

'

test_expect_success 'whitespace=nowarn, default rule' '

        apply_patch --whitespace=nowarn &&
        diff file target

'

test_expect_success 'whitespace=warn, default rule' '

        apply_patch --whitespace=warn &&
        diff file target

'

test_expect_success 'whitespace=error-all, default rule' '

        apply_patch --whitespace=error-all && return 1
        test -s target && return 1
        : happy

'

test_expect_success 'whitespace=error-all, no rule' '

        git config core.whitespace -trailing,-space-before,-indent &&
        apply_patch --whitespace=error-all &&
        diff file target

'

test_expect_success 'whitespace=error-all, no rule (attribute)' '

        git config --unset core.whitespace &&
        echo "target -whitespace" >.gitattributes &&
        apply_patch --whitespace=error-all &&
        diff file target

'

for t in - ''
do
        case "$t" in '') tt='!' ;; *) tt= ;; esac
        for s in - ''
        do
                case "$s" in '') ts='@' ;; *) ts= ;; esac
                for i in - ''
                do
                        case "$i" in '') ti='#' ;; *) ti= ;; esac
                        for h in - ''
                        do
                                [ -z "$h$i" ] && continue
                                case "$h" in '') th='%' ;; *) th= ;; esac
                                rule=${t}trailing,${s}space,${i}indent,${h}tab

                                rm -f .gitattributes
                                test_expect_success "rule=$rule" '
                                        git config core.whitespace "$rule" &&
                                        test_fix "$tt$ts$ti$th"
                                '

                                test_expect_success "rule=$rule (attributes)" '
                                        git config --unset core.whitespace &&
                                        echo "target whitespace=$rule" >.gitattributes &&
                                        test_fix "$tt$ts$ti$th"
                                '

                        done
                done
        done
done

create_patch () {
        sed -e "s/_/ /" <<-\EOF
                diff --git a/target b/target
                index e69de29..8bd6648 100644
                --- a/target
                +++ b/target
                @@ -0,0 +1,3 @@
                +An empty line follows
                +
                +A line with trailing whitespace and no newline_
                \ No newline at end of file
        EOF
}

test_expect_success 'trailing whitespace & no newline at the end of file' '
        >target &&
        create_patch >patch-file &&
        git apply --whitespace=fix patch-file &&
        grep "newline$" target &&
        grep "^$" target
'

test_expect_success 'blank at EOF with --whitespace=fix (1)' '
        : these can fail depending on what we did before
        git config --unset core.whitespace
        rm -f .gitattributes

        { echo a; echo b; echo c; } >one &&
        git add one &&
        { echo a; echo b; echo c; } >expect &&
        { cat expect; echo; } >one &&
        git diff -- one >patch &&

        git checkout one &&
        git apply --whitespace=fix patch &&
        test_cmp expect one
'

test_expect_success 'blank at EOF with --whitespace=fix (2)' '
        { echo a; echo b; echo c; } >one &&
        git add one &&
        { echo a; echo c; } >expect &&
        { cat expect; echo; echo; } >one &&
        git diff -- one >patch &&

        git checkout one &&
        git apply --whitespace=fix patch &&
        test_cmp expect one
'

test_expect_success 'blank at EOF with --whitespace=fix (3)' '
        { echo a; echo b; echo; } >one &&
        git add one &&
        { echo a; echo c; echo; } >expect &&
        { cat expect; echo; echo; } >one &&
        git diff -- one >patch &&

        git checkout one &&
        git apply --whitespace=fix patch &&
        test_cmp expect one
'

test_expect_success 'blank at end of hunk, not at EOF with --whitespace=fix' '
        { echo a; echo b; echo; echo; echo; echo; echo; echo d; } >one &&
        git add one &&
        { echo a; echo c; echo; echo; echo; echo; echo; echo; echo d; } >expect &&
        cp expect one &&
        git diff -- one >patch &&

        git checkout one &&
        git apply --whitespace=fix patch &&
        test_cmp expect one
'

test_expect_success 'blank at EOF with --whitespace=warn' '
        { echo a; echo b; echo c; } >one &&
        git add one &&
        echo >>one &&
        cat one >expect &&
        git diff -- one >patch &&

        git checkout one &&
        git apply --whitespace=warn patch 2>error &&
        test_cmp expect one &&
        grep "new blank line at EOF" error
'

test_expect_success 'blank at EOF with --whitespace=error' '
        { echo a; echo b; echo c; } >one &&
        git add one &&
        cat one >expect &&
        echo >>one &&
        git diff -- one >patch &&

        git checkout one &&
        test_must_fail git apply --whitespace=error patch 2>error &&
        test_cmp expect one &&
        grep "new blank line at EOF" error
'

test_expect_success 'blank but not empty at EOF' '
        { echo a; echo b; echo c; } >one &&
        git add one &&
        echo "   " >>one &&
        cat one >expect &&
        git diff -- one >patch &&

        git checkout one &&
        git apply --whitespace=warn patch 2>error &&
        test_cmp expect one &&
        grep "new blank line at EOF" error
'

test_expect_success 'applying beyond EOF requires one non-blank context line' '
        { echo; echo; echo; echo; } >one &&
        git add one &&
        { echo b; } >>one &&
        git diff -- one >patch &&

        git checkout one &&
        { echo a; echo; } >one &&
        cp one expect &&
        test_must_fail git apply --whitespace=fix patch &&
        test_cmp one expect &&
        test_must_fail git apply --ignore-space-change --whitespace=fix patch &&
        test_cmp one expect
'

test_expect_success 'tons of blanks at EOF should not apply' '
        for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16; do
                echo; echo; echo; echo;
        done >one &&
        git add one &&
        echo a >>one &&
        git diff -- one >patch &&

        >one &&
        test_must_fail git apply --whitespace=fix patch &&
        test_must_fail git apply --ignore-space-change --whitespace=fix patch
'

test_expect_success 'missing blank line at end with --whitespace=fix' '
        echo a >one &&
        echo >>one &&
        git add one &&
        echo b >>one &&
        cp one expect &&
        git diff -- one >patch &&
        echo a >one &&
        cp one saved-one &&
        test_must_fail git apply patch &&
        git apply --whitespace=fix patch &&
        test_cmp one expect &&
        mv saved-one one &&
        git apply --ignore-space-change --whitespace=fix patch &&
        test_cmp one expect
'

test_expect_success 'two missing blank lines at end with --whitespace=fix' '
        { echo a; echo; echo b; echo c; } >one &&
        cp one no-blank-lines &&
        { echo; echo; } >>one &&
        git add one &&
        echo d >>one &&
        cp one expect &&
        echo >>one &&
        git diff -- one >patch &&
        cp no-blank-lines one &&
        test_must_fail git apply patch &&
        git apply --whitespace=fix patch &&
        test_cmp one expect &&
        mv no-blank-lines one &&
        test_must_fail git apply patch &&
        git apply --ignore-space-change --whitespace=fix patch &&
        test_cmp one expect
'

test_expect_success 'missing blank line at end, insert before end, --whitespace=fix' '
        { echo a; echo; } >one &&
        git add one &&
        { echo b; echo a; echo; } >one &&
        cp one expect &&
        git diff -- one >patch &&
        echo a >one &&
        test_must_fail git apply patch &&
        git apply --whitespace=fix patch &&
        test_cmp one expect
'

test_expect_success 'shrink file with tons of missing blanks at end of file' '
        { echo a; echo b; echo c; } >one &&
        cp one no-blank-lines &&
        for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16; do
                echo; echo; echo; echo;
        done >>one &&
        git add one &&
        echo a >one &&
        cp one expect &&
        git diff -- one >patch &&
        cp no-blank-lines one &&
        test_must_fail git apply patch &&
        git apply --whitespace=fix patch &&
        test_cmp one expect &&
        mv no-blank-lines one &&
        git apply --ignore-space-change --whitespace=fix patch &&
        test_cmp one expect
'

test_expect_success 'missing blanks at EOF must only match blank lines' '
        { echo a; echo b; } >one &&
        git add one &&
        { echo c; echo d; } >>one &&
        git diff -- one >patch &&

        echo a >one &&
        test_must_fail git apply patch
        test_must_fail git apply --whitespace=fix patch &&
        test_must_fail git apply --ignore-space-change --whitespace=fix patch
'

sed -e's/Z//' >one <<EOF
a
b
c
                      Z
EOF

test_expect_success 'missing blank line should match context line with spaces' '
        git add one &&
        echo d >>one &&
        git diff -- one >patch &&
        { echo a; echo b; echo c; } >one &&
        cp one expect &&
        { echo; echo d; } >>expect &&
        git add one &&

        git apply --whitespace=fix patch &&
        test_cmp one expect
'

sed -e's/Z//' >one <<EOF
a
b
c
                      Z
EOF

test_expect_success 'same, but with the --ignore-space-option' '
        git add one &&
        echo d >>one &&
        cp one expect &&
        git diff -- one >patch &&
        { echo a; echo b; echo c; } >one &&
        git add one &&

        git checkout-index -f one &&
        git apply --ignore-space-change --whitespace=fix patch &&
        test_cmp one expect
'

test_expect_success 'same, but with CR-LF line endings && cr-at-eol set' '
        git config core.whitespace cr-at-eol &&
        printf "a\r\n" >one &&
        printf "b\r\n" >>one &&
        printf "c\r\n" >>one &&
        cp one save-one &&
        printf "                 \r\n" >>one
        git add one &&
        printf "d\r\n" >>one &&
        cp one expect &&
        git diff -- one >patch &&
        mv save-one one &&

        git apply --ignore-space-change --whitespace=fix patch &&
        test_cmp one expect
'

test_expect_success 'same, but with CR-LF line endings && cr-at-eol unset' '
        git config --unset core.whitespace &&
        printf "a\r\n" >one &&
        printf "b\r\n" >>one &&
        printf "c\r\n" >>one &&
        cp one save-one &&
        printf "                 \r\n" >>one
        git add one &&
        cp one expect &&
        printf "d\r\n" >>one &&
        git diff -- one >patch &&
        mv save-one one &&
        echo d >>expect &&

        git apply --ignore-space-change --whitespace=fix patch &&
        test_cmp one expect
'

test_done