#!/bin/sh
#
# Copyright (c) 2006 Junio C Hamano
#

test_description='git grep various.
'

. ./test-lib.sh

cat >hello.c <<EOF
#include <stdio.h>
int main(int argc, const char **argv)
{
        printf("Hello world.\n");
        return 0;
        /* char ?? */
}
EOF

test_expect_success setup '
        {
                echo foo mmap bar
                echo foo_mmap bar
                echo foo_mmap bar mmap
                echo foo mmap bar_mmap
                echo foo_mmap bar mmap baz
        } >file &&
        {
                echo Hello world
                echo HeLLo world
                echo Hello_world
                echo HeLLo_world
        } >hello_world &&
        {
                echo "a+b*c"
                echo "a+bc"
                echo "abc"
        } >ab &&
        echo vvv >v &&
        echo ww w >w &&
        echo x x xx x >x &&
        echo y yy >y &&
        echo zzz > z &&
        mkdir t &&
        echo test >t/t &&
        echo vvv >t/v &&
        mkdir t/a &&
        echo vvv >t/a/v &&
        {
                echo "line without leading space1"
                echo " line with leading space1"
                echo " line with leading space2"
                echo " line with leading space3"
                echo "line without leading space2"
        } >space &&
        git add . &&
        test_tick &&
        git commit -m initial
'

test_expect_success 'grep should not segfault with a bad input' '
        test_must_fail git grep "("
'

for H in HEAD ''
do
        case "$H" in
        HEAD)   HC='HEAD:' L='HEAD' ;;
        '')     HC= L='in working tree' ;;
        esac

        test_expect_success "grep -w $L" '
                {
                        echo ${HC}file:1:foo mmap bar
                        echo ${HC}file:3:foo_mmap bar mmap
                        echo ${HC}file:4:foo mmap bar_mmap
                        echo ${HC}file:5:foo_mmap bar mmap baz
                } >expected &&
                git -c grep.linenumber=false grep -n -w -e mmap $H >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep -w $L" '
                {
                        echo ${HC}file:1:foo mmap bar
                        echo ${HC}file:3:foo_mmap bar mmap
                        echo ${HC}file:4:foo mmap bar_mmap
                        echo ${HC}file:5:foo_mmap bar mmap baz
                } >expected &&
                git -c grep.linenumber=true grep -w -e mmap $H >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep -w $L" '
                {
                        echo ${HC}file:foo mmap bar
                        echo ${HC}file:foo_mmap bar mmap
                        echo ${HC}file:foo mmap bar_mmap
                        echo ${HC}file:foo_mmap bar mmap baz
                } >expected &&
                git -c grep.linenumber=true grep --no-line-number -w -e mmap $H >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep -w $L (w)" '
                : >expected &&
                test_must_fail git grep -n -w -e "^w" >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep -w $L (x)" '
                {
                        echo ${HC}x:1:x x xx x
                } >expected &&
                git grep -n -w -e "x xx* x" $H >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep -w $L (y-1)" '
                {
                        echo ${HC}y:1:y yy
                } >expected &&
                git grep -n -w -e "^y" $H >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep -w $L (y-2)" '
                : >expected &&
                if git grep -n -w -e "^y y" $H >actual
                then
                        echo should not have matched
                        cat actual
                        false
                else
                        test_cmp expected actual
                fi
        '

        test_expect_success "grep -w $L (z)" '
                : >expected &&
                if git grep -n -w -e "^z" $H >actual
                then
                        echo should not have matched
                        cat actual
                        false
                else
                        test_cmp expected actual
                fi
        '

        test_expect_success "grep $L (t-1)" '
                echo "${HC}t/t:1:test" >expected &&
                git grep -n -e test $H >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep $L (t-2)" '
                echo "${HC}t:1:test" >expected &&
                (
                        cd t &&
                        git grep -n -e test $H
                ) >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep $L (t-3)" '
                echo "${HC}t/t:1:test" >expected &&
                (
                        cd t &&
                        git grep --full-name -n -e test $H
                ) >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep -c $L (no /dev/null)" '
                ! git grep -c test $H | grep /dev/null
        '

        test_expect_success "grep --max-depth -1 $L" '
                {
                        echo ${HC}t/a/v:1:vvv
                        echo ${HC}t/v:1:vvv
                        echo ${HC}v:1:vvv
                } >expected &&
                git grep --max-depth -1 -n -e vvv $H >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep --max-depth 0 $L" '
                {
                        echo ${HC}v:1:vvv
                } >expected &&
                git grep --max-depth 0 -n -e vvv $H >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep --max-depth 0 -- '*' $L" '
                {
                        echo ${HC}t/a/v:1:vvv
                        echo ${HC}t/v:1:vvv
                        echo ${HC}v:1:vvv
                } >expected &&
                git grep --max-depth 0 -n -e vvv $H -- "*" >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep --max-depth 1 $L" '
                {
                        echo ${HC}t/v:1:vvv
                        echo ${HC}v:1:vvv
                } >expected &&
                git grep --max-depth 1 -n -e vvv $H >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep --max-depth 0 -- t $L" '
                {
                        echo ${HC}t/v:1:vvv
                } >expected &&
                git grep --max-depth 0 -n -e vvv $H -- t >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep --max-depth 0 -- . t $L" '
                {
                        echo ${HC}t/v:1:vvv
                        echo ${HC}v:1:vvv
                } >expected &&
                git grep --max-depth 0 -n -e vvv $H -- . t >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep --max-depth 0 -- t . $L" '
                {
                        echo ${HC}t/v:1:vvv
                        echo ${HC}v:1:vvv
                } >expected &&
                git grep --max-depth 0 -n -e vvv $H -- t . >actual &&
                test_cmp expected actual
        '
        test_expect_success "grep $L with grep.extendedRegexp=false" '
                echo "ab:a+bc" >expected &&
                git -c grep.extendedRegexp=false grep "a+b*c" ab >actual &&
                test_cmp expected actual
        '

        test_expect_success "grep $L with grep.extendedRegexp=true" '
                echo "ab:abc" >expected &&
                git -c grep.extendedRegexp=true grep "a+b*c" ab >actual &&
                test_cmp expected actual
        '
done

cat >expected <<EOF
file
EOF
test_expect_success 'grep -l -C' '
        git grep -l -C1 foo >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
file:5
EOF
test_expect_success 'grep -l -C' '
        git grep -c -C1 foo >actual &&
        test_cmp expected actual
'

test_expect_success 'grep -L -C' '
        git ls-files >expected &&
        git grep -L -C1 nonexistent_string >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
file:foo mmap bar_mmap
EOF

test_expect_success 'grep -e A --and -e B' '
        git grep -e "foo mmap" --and -e bar_mmap >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
file:foo_mmap bar mmap
file:foo_mmap bar mmap baz
EOF


test_expect_success 'grep ( -e A --or -e B ) --and -e B' '
        git grep \( -e foo_ --or -e baz \) \
                --and -e " mmap" >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
file:foo mmap bar
EOF

test_expect_success 'grep -e A --and --not -e B' '
        git grep -e "foo mmap" --and --not -e bar_mmap >actual &&
        test_cmp expected actual
'

test_expect_success 'grep should ignore GREP_OPTIONS' '
        GREP_OPTIONS=-v git grep " mmap bar\$" >actual &&
        test_cmp expected actual
'

test_expect_success 'grep -f, non-existent file' '
        test_must_fail git grep -f patterns
'

cat >expected <<EOF
file:foo mmap bar
file:foo_mmap bar
file:foo_mmap bar mmap
file:foo mmap bar_mmap
file:foo_mmap bar mmap baz
EOF

cat >pattern <<EOF
mmap
EOF

test_expect_success 'grep -f, one pattern' '
        git grep -f pattern >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
file:foo mmap bar
file:foo_mmap bar
file:foo_mmap bar mmap
file:foo mmap bar_mmap
file:foo_mmap bar mmap baz
t/a/v:vvv
t/v:vvv
v:vvv
EOF

cat >patterns <<EOF
mmap
vvv
EOF

test_expect_success 'grep -f, multiple patterns' '
        git grep -f patterns >actual &&
        test_cmp expected actual
'

test_expect_success 'grep, multiple patterns' '
        git grep "$(cat patterns)" >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
file:foo mmap bar
file:foo_mmap bar
file:foo_mmap bar mmap
file:foo mmap bar_mmap
file:foo_mmap bar mmap baz
t/a/v:vvv
t/v:vvv
v:vvv
EOF

cat >patterns <<EOF

mmap

vvv

EOF

test_expect_success 'grep -f, ignore empty lines' '
        git grep -f patterns >actual &&
        test_cmp expected actual
'

test_expect_success 'grep -f, ignore empty lines, read patterns from stdin' '
        git grep -f - <patterns >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
y:y yy
--
z:zzz
EOF

test_expect_success 'grep -q, silently report matches' '
        >empty &&
        git grep -q mmap >actual &&
        test_cmp empty actual &&
        test_must_fail git grep -q qfwfq >actual &&
        test_cmp empty actual
'

# Create 1024 file names that sort between "y" and "z" to make sure
# the two files are handled by different calls to an external grep.
# This depends on MAXARGS in builtin-grep.c being 1024 or less.
c32="0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p q r s t u v"
test_expect_success 'grep -C1, hunk mark between files' '
        for a in $c32; do for b in $c32; do : >y-$a$b; done; done &&
        git add y-?? &&
        git grep -C1 "^[yz]" >actual &&
        test_cmp expected actual
'

test_expect_success 'grep -C1 hunk mark between files' '
        git grep -C1 "^[yz]" >actual &&
        test_cmp expected actual
'

test_expect_success 'log grep setup' '
        echo a >>file &&
        test_tick &&
        GIT_AUTHOR_NAME="With * Asterisk" \
        GIT_AUTHOR_EMAIL="xyzzy@frotz.com" \
        git commit -a -m "second" &&

        echo a >>file &&
        test_tick &&
        git commit -a -m "third" &&

        echo a >>file &&
        test_tick &&
        GIT_AUTHOR_NAME="Night Fall" \
        GIT_AUTHOR_EMAIL="nitfol@frobozz.com" \
        git commit -a -m "fourth"
'

test_expect_success 'log grep (1)' '
        git log --author=author --pretty=tformat:%s >actual &&
        {
                echo third && echo initial
        } >expect &&
        test_cmp expect actual
'

test_expect_success 'log grep (2)' '
        git log --author=" * " -F --pretty=tformat:%s >actual &&
        {
                echo second
        } >expect &&
        test_cmp expect actual
'

test_expect_success 'log grep (3)' '
        git log --author="^A U" --pretty=tformat:%s >actual &&
        {
                echo third && echo initial
        } >expect &&
        test_cmp expect actual
'

test_expect_success 'log grep (4)' '
        git log --author="frotz\.com>$" --pretty=tformat:%s >actual &&
        {
                echo second
        } >expect &&
        test_cmp expect actual
'

test_expect_success 'log grep (5)' '
        git log --author=Thor -F --pretty=tformat:%s >actual &&
        {
                echo third && echo initial
        } >expect &&
        test_cmp expect actual
'

test_expect_success 'log grep (6)' '
        git log --author=-0700  --pretty=tformat:%s >actual &&
        >expect &&
        test_cmp expect actual
'

test_expect_success 'log with multiple --grep uses union' '
        git log --grep=i --grep=r --format=%s >actual &&
        {
                echo fourth && echo third && echo initial
        } >expect &&
        test_cmp expect actual
'

test_expect_success 'log --all-match with multiple --grep uses intersection' '
        git log --all-match --grep=i --grep=r --format=%s >actual &&
        {
                echo third
        } >expect &&
        test_cmp expect actual
'

test_expect_success 'log --grep --author implicitly uses all-match' '
        # grep matches initial and second but not third
        # author matches only initial and third
        git log --author="A U Thor" --grep=s --grep=l --format=%s >actual &&
        {
                echo initial
        } >expect &&
        test_cmp expect actual
'

test_expect_success 'log with multiple --author uses union' '
        git log --author="Thor" --author="Aster" --format=%s >actual &&
        {
            echo third && echo second && echo initial
        } >expect &&
        test_cmp expect actual
'

test_expect_success 'log with --grep and multiple --author uses all-match' '
        git log --author="Thor" --author="Night" --grep=i --format=%s >actual &&
        {
            echo third && echo initial
        } >expect &&
        test_cmp expect actual
'

test_expect_success 'log with --grep and multiple --author uses all-match' '
        git log --author="Thor" --author="Night" --grep=q --format=%s >actual &&
        >expect &&
        test_cmp expect actual
'

test_expect_success 'grep with CE_VALID file' '
        git update-index --assume-unchanged t/t &&
        rm t/t &&
        test "$(git grep test)" = "t/t:test" &&
        git update-index --no-assume-unchanged t/t &&
        git checkout t/t
'

cat >expected <<EOF
hello.c=#include <stdio.h>
hello.c:        return 0;
EOF

test_expect_success 'grep -p with userdiff' '
        git config diff.custom.funcname "^#" &&
        echo "hello.c diff=custom" >.gitattributes &&
        git grep -p return >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
hello.c=int main(int argc, const char **argv)
hello.c:        return 0;
EOF

test_expect_success 'grep -p' '
        rm -f .gitattributes &&
        git grep -p return >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
hello.c-#include <stdio.h>
hello.c=int main(int argc, const char **argv)
hello.c-{
hello.c-        printf("Hello world.\n");
hello.c:        return 0;
EOF

test_expect_success 'grep -p -B5' '
        git grep -p -B5 return >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
hello.c=int main(int argc, const char **argv)
hello.c-{
hello.c-        printf("Hello world.\n");
hello.c:        return 0;
hello.c-        /* char ?? */
hello.c-}
EOF

test_expect_success 'grep -W' '
        git grep -W return >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
hello.c=        printf("Hello world.\n");
hello.c:        return 0;
hello.c-        /* char ?? */
EOF

test_expect_success 'grep -W with userdiff' '
        test_when_finished "rm -f .gitattributes" &&
        git config diff.custom.xfuncname "(printf.*|})$" &&
        echo "hello.c diff=custom" >.gitattributes &&
        git grep -W return >actual &&
        test_cmp expected actual
'

test_expect_success 'grep from a subdirectory to search wider area (1)' '
        mkdir -p s &&
        (
                cd s && git grep "x x x" ..
        )
'

test_expect_success 'grep from a subdirectory to search wider area (2)' '
        mkdir -p s &&
        (
                cd s || exit 1
                ( git grep xxyyzz .. >out ; echo $? >status )
                ! test -s out &&
                test 1 = $(cat status)
        )
'

cat >expected <<EOF
hello.c:int main(int argc, const char **argv)
EOF

test_expect_success 'grep -Fi' '
        git grep -Fi "CHAR *" >actual &&
        test_cmp expected actual
'

test_expect_success 'outside of git repository' '
        rm -fr non &&
        mkdir -p non/git/sub &&
        echo hello >non/git/file1 &&
        echo world >non/git/sub/file2 &&
        {
                echo file1:hello &&
                echo sub/file2:world
        } >non/expect.full &&
        echo file2:world >non/expect.sub &&
        (
                GIT_CEILING_DIRECTORIES="$(pwd)/non/git" &&
                export GIT_CEILING_DIRECTORIES &&
                cd non/git &&
                test_must_fail git grep o &&
                git grep --no-index o >../actual.full &&
                test_cmp ../expect.full ../actual.full
                cd sub &&
                test_must_fail git grep o &&
                git grep --no-index o >../../actual.sub &&
                test_cmp ../../expect.sub ../../actual.sub
        ) &&

        echo ".*o*" >non/git/.gitignore &&
        (
                GIT_CEILING_DIRECTORIES="$(pwd)/non/git" &&
                export GIT_CEILING_DIRECTORIES &&
                cd non/git &&
                test_must_fail git grep o &&
                git grep --no-index --exclude-standard o >../actual.full &&
                test_cmp ../expect.full ../actual.full &&

                {
                        echo ".gitignore:.*o*"
                        cat ../expect.full
                } >../expect.with.ignored &&
                git grep --no-index --no-exclude o >../actual.full &&
                test_cmp ../expect.with.ignored ../actual.full
        )
'

test_expect_success 'inside git repository but with --no-index' '
        rm -fr is &&
        mkdir -p is/git/sub &&
        echo hello >is/git/file1 &&
        echo world >is/git/sub/file2 &&
        echo ".*o*" >is/git/.gitignore &&
        {
                echo file1:hello &&
                echo sub/file2:world
        } >is/expect.unignored &&
        {
                echo ".gitignore:.*o*" &&
                cat is/expect.unignored
        } >is/expect.full &&
        : >is/expect.empty &&
        echo file2:world >is/expect.sub &&
        (
                cd is/git &&
                git init &&
                test_must_fail git grep o >../actual.full &&
                test_cmp ../expect.empty ../actual.full &&

                git grep --untracked o >../actual.unignored &&
                test_cmp ../expect.unignored ../actual.unignored &&

                git grep --no-index o >../actual.full &&
                test_cmp ../expect.full ../actual.full &&

                git grep --no-index --exclude-standard o >../actual.unignored &&
                test_cmp ../expect.unignored ../actual.unignored &&

                cd sub &&
                test_must_fail git grep o >../../actual.sub &&
                test_cmp ../../expect.empty ../../actual.sub &&

                git grep --no-index o >../../actual.sub &&
                test_cmp ../../expect.sub ../../actual.sub &&

                git grep --untracked o >../../actual.sub &&
                test_cmp ../../expect.sub ../../actual.sub
        )
'

test_expect_success 'setup double-dash tests' '
cat >double-dash <<EOF &&
--
->
other
EOF
git add double-dash
'

cat >expected <<EOF
double-dash:->
EOF
test_expect_success 'grep -- pattern' '
        git grep -- "->" >actual &&
        test_cmp expected actual
'
test_expect_success 'grep -- pattern -- pathspec' '
        git grep -- "->" -- double-dash >actual &&
        test_cmp expected actual
'
test_expect_success 'grep -e pattern -- path' '
        git grep -e "->" -- double-dash >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
double-dash:--
EOF
test_expect_success 'grep -e -- -- path' '
        git grep -e -- -- double-dash >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
hello.c:int main(int argc, const char **argv)
hello.c:        printf("Hello world.\n");
EOF

test_expect_success LIBPCRE 'grep --perl-regexp pattern' '
        git grep --perl-regexp "\p{Ps}.*?\p{Pe}" hello.c >actual &&
        test_cmp expected actual
'

test_expect_success LIBPCRE 'grep -P pattern' '
        git grep -P "\p{Ps}.*?\p{Pe}" hello.c >actual &&
        test_cmp expected actual
'

test_expect_success 'grep pattern with grep.extendedRegexp=true' '
        >empty &&
        test_must_fail git -c grep.extendedregexp=true \
                grep "\p{Ps}.*?\p{Pe}" hello.c >actual &&
        test_cmp empty actual
'

test_expect_success LIBPCRE 'grep -P pattern with grep.extendedRegexp=true' '
        git -c grep.extendedregexp=true \
                grep -P "\p{Ps}.*?\p{Pe}" hello.c >actual &&
        test_cmp expected actual
'

test_expect_success LIBPCRE 'grep -P -v pattern' '
        {
                echo "ab:a+b*c"
                echo "ab:a+bc"
        } >expected &&
        git grep -P -v "abc" ab >actual &&
        test_cmp expected actual
'

test_expect_success LIBPCRE 'grep -P -i pattern' '
        cat >expected <<-EOF &&
        hello.c:        printf("Hello world.\n");
        EOF
        git grep -P -i "PRINTF\([^\d]+\)" hello.c >actual &&
        test_cmp expected actual
'

test_expect_success LIBPCRE 'grep -P -w pattern' '
        {
                echo "hello_world:Hello world"
                echo "hello_world:HeLLo world"
        } >expected &&
        git grep -P -w "He((?i)ll)o" hello_world >actual &&
        test_cmp expected actual
'

test_expect_success 'grep -G invalidpattern properly dies ' '
        test_must_fail git grep -G "a["
'

test_expect_success 'grep -E invalidpattern properly dies ' '
        test_must_fail git grep -E "a["
'

test_expect_success LIBPCRE 'grep -P invalidpattern properly dies ' '
        test_must_fail git grep -P "a["
'

test_expect_success 'grep -G -E -F pattern' '
        echo "ab:a+b*c" >expected &&
        git grep -G -E -F "a+b*c" ab >actual &&
        test_cmp expected actual
'

test_expect_success 'grep -E -F -G pattern' '
        echo "ab:a+bc" >expected &&
        git grep -E -F -G "a+b*c" ab >actual &&
        test_cmp expected actual
'

test_expect_success 'grep -F -G -E pattern' '
        echo "ab:abc" >expected &&
        git grep -F -G -E "a+b*c" ab >actual &&
        test_cmp expected actual
'

test_expect_success 'grep -G -F -P -E pattern' '
        >empty &&
        test_must_fail git grep -G -F -P -E "a\x{2b}b\x{2a}c" ab >actual &&
        test_cmp empty actual
'

test_expect_success LIBPCRE 'grep -G -F -E -P pattern' '
        echo "ab:a+b*c" >expected &&
        git grep -G -F -E -P "a\x{2b}b\x{2a}c" ab >actual &&
        test_cmp expected actual
'

test_config() {
        git config "$1" "$2" &&
        test_when_finished "git config --unset $1"
}

cat >expected <<EOF
hello.c<RED>:<RESET>int main(int argc, const char **argv)
hello.c<RED>-<RESET>{
<RED>--<RESET>
hello.c<RED>:<RESET>    /* char ?? */
hello.c<RED>-<RESET>}
<RED>--<RESET>
hello_world<RED>:<RESET>Hello_world
hello_world<RED>-<RESET>HeLLo_world
EOF

test_expect_success 'grep --color, separator' '
        test_config color.grep.context          normal &&
        test_config color.grep.filename         normal &&
        test_config color.grep.function         normal &&
        test_config color.grep.linenumber       normal &&
        test_config color.grep.match            normal &&
        test_config color.grep.selected         normal &&
        test_config color.grep.separator        red &&

        git grep --color=always -A1 -e char -e lo_w hello.c hello_world |
        test_decode_color >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
hello.c:int main(int argc, const char **argv)
hello.c:        /* char ?? */

hello_world:Hello_world
EOF

test_expect_success 'grep --break' '
        git grep --break -e char -e lo_w hello.c hello_world >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
hello.c:int main(int argc, const char **argv)
hello.c-{
--
hello.c:        /* char ?? */
hello.c-}

hello_world:Hello_world
hello_world-HeLLo_world
EOF

test_expect_success 'grep --break with context' '
        git grep --break -A1 -e char -e lo_w hello.c hello_world >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
hello.c
int main(int argc, const char **argv)
        /* char ?? */
hello_world
Hello_world
EOF

test_expect_success 'grep --heading' '
        git grep --heading -e char -e lo_w hello.c hello_world >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
<BOLD;GREEN>hello.c<RESET>
2:int main(int argc, const <BLACK;BYELLOW>char<RESET> **argv)
6:      /* <BLACK;BYELLOW>char<RESET> ?? */

<BOLD;GREEN>hello_world<RESET>
3:Hel<BLACK;BYELLOW>lo_w<RESET>orld
EOF

test_expect_success 'mimic ack-grep --group' '
        test_config color.grep.context          normal &&
        test_config color.grep.filename         "bold green" &&
        test_config color.grep.function         normal &&
        test_config color.grep.linenumber       normal &&
        test_config color.grep.match            "black yellow" &&
        test_config color.grep.selected         normal &&
        test_config color.grep.separator        normal &&

        git grep --break --heading -n --color \
                -e char -e lo_w hello.c hello_world |
        test_decode_color >actual &&
        test_cmp expected actual
'

cat >expected <<EOF
space: line with leading space1
space: line with leading space2
space: line with leading space3
EOF

test_expect_success LIBPCRE 'grep -E "^ "' '
        git grep -E "^ " space >actual &&
        test_cmp expected actual
'

test_expect_success LIBPCRE 'grep -P "^ "' '
        git grep -P "^ " space >actual &&
        test_cmp expected actual
'

test_done