When `git-grep` is run with -P/--perl-regexp, it doesn't match ^ and $ at
the beginning/end of the line. This is because PCRE normally matches ^
and $ at the beginning/end of the whole text, not for each line, and git-grep
firstly passes a large chunk of text (possibly containing many lines) to
pcre_exec() before it splits the text into lines. This makes `git-grep -P`
behave differently from `git-grep -E` and also from `grep -P` and `pcregrep`:
$ cat file
a
b
$ git --no-pager grep --no-index -P '^ ' file
$ git --no-pager grep --no-index -E '^ ' file
file: b
$ grep -c -P '^ ' file
b
$ pcregrep -c '^ ' file
b
Reported-by: Zbigniew Jędrzejewski-Szmek <zbyszek@xxxxxxxxx>
Signed-off-by: Michał Kiedrowicz <michal.kiedrowicz@xxxxxxxxx>
---
grep.c | 2 +-
t/t7810-grep.sh | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+), 1 deletions(-)
diff --git a/grep.c b/grep.c
index 3821400..f492d26 100644
--- a/grep.c
+++ b/grep.c
@@ -79,7 +79,7 @@ static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
{
const char *error;
int erroffset;
- int options = 0;
+ int options = PCRE_MULTILINE;
if (opt->ignore_case)
options |= PCRE_CASELESS;
diff --git a/t/t7810-grep.sh b/t/t7810-grep.sh
index 75f4716..dd6e6d5 100755
--- a/t/t7810-grep.sh
+++ b/t/t7810-grep.sh
@@ -47,6 +47,13 @@ test_expect_success setup '
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
@@ -893,4 +900,20 @@ test_expect_success 'mimic ack-grep --group' '
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 'grep -E "^ "' '
+ git grep -E "^ " space >actual &&
+ test_cmp expected actual
+'
+
+test_expect_success "grep -P '^ '" '
+ git grep -P "^ " space >actual &&
+ test_cmp expected actual
+'
+
test_done
--
1.7.8.4
--
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