Add exhaustive tests for how the different grep.patternType options &
the corresponding command-line options affect git-log.
Before this change it was possible to patch revision.c so that the
--basic-regexp option was synonymous with --extended-regexp, and
--perl-regexp wasn't recognized at all, and still have 100% of the
test suite pass.
This was because the first test being modified here, added in commit
34a4ae55b2 ("log --grep: use the same helper to set -E/-F options as
"git grep"", 2012-10-03), didn't actually check whether we'd enabled
extended regular expressions as distinct from re-toggling non-fixed
string support.
Fix that by changing the pattern to a pattern that'll only match if
--extended-regexp option is provided, but won't match under the
default --basic-regexp option.
Other potential regressions were possible since there were no tests
for the rest of the combinations of grep.patternType configuration
toggles & corresponding git-log command-line options. Add exhaustive
tests for those.
The patterns being passed to fixed/basic/extended/PCRE are carefully
crafted to return the wrong thing if the grep engine were to pick any
other matching method than the one it's told to use.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
t/t4202-log.sh | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 97 insertions(+), 1 deletion(-)
diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index f577990716..a8dce0ca2d 100755
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -262,7 +262,30 @@ test_expect_success 'log --grep -i' '
test_expect_success 'log -F -E --grep=<ere> uses ere' '
echo second >expect &&
- git log -1 --pretty="tformat:%s" -F -E --grep=s.c.nd >actual &&
+ # basic would need \(s\) to do the same
+ git log -1 --pretty="tformat:%s" -F -E --grep="(s).c.nd" >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success PCRE 'log -F -E --perl-regexp --grep=<pcre> uses PCRE' '
+ test_when_finished "rm -rf num_commits" &&
+ git init num_commits &&
+ (
+ cd num_commits &&
+ test_commit 1d &&
+ test_commit 2e
+ ) &&
+
+ # In PCRE \d in [\d] is like saying "0-9", and matches the 2
+ # in 2e...
+ echo 2e >expect &&
+ git -C num_commits log -1 --pretty="tformat:%s" -F -E --perl-regexp --grep="[\d]" >actual &&
+ test_cmp expect actual &&
+
+ # ...in POSIX basic and extended it is the same as [d],
+ # i.e. "d", which matches 1d, but does not match 2e.
+ echo 1d >expect &&
+ git -C num_commits log -1 --pretty="tformat:%s" -F -E --grep="[\d]" >actual &&
test_cmp expect actual
'
@@ -280,6 +303,79 @@ test_expect_success 'log with grep.patternType configuration and command line' '
test_cmp expect actual
'
+test_expect_success 'log with various grep.patternType configurations & command-lines' '
+ git init pattern-type &&
+ (
+ cd pattern-type &&
+ test_commit 1 file A &&
+
+ # The tagname is overridden here because creating a
+ # tag called "(1|2)" as test_commit would otherwise
+ # implicitly do would fail on e.g. MINGW.
+ test_commit "(1|2)" file B 2 &&
+
+ echo "(1|2)" >expect.fixed &&
+ cp expect.fixed expect.basic &&
+ cp expect.fixed expect.extended &&
+ cp expect.fixed expect.perl &&
+
+ # A strcmp-like match with fixed.
+ git -c grep.patternType=fixed log --pretty=tformat:%s \
+ --grep="(1|2)" >actual.fixed &&
+
+ # POSIX basic matches (, | and ) literally.
+ git -c grep.patternType=basic log --pretty=tformat:%s \
+ --grep="(.|.)" >actual.basic &&
+
+ # POSIX extended needs to have | escaped to match it
+ # literally, whereas under basic this is the same as
+ # (|2), i.e. it would also match "1". This test checks
+ # for extended by asserting that it is not matching
+ # what basic would match.
+ git -c grep.patternType=extended log --pretty=tformat:%s \
+ --grep="\|2" >actual.extended &&
+ if test_have_prereq PCRE
+ then
+ # Only PCRE would match [\d]\| with only
+ # "(1|2)" due to [\d]. POSIX basic would match
+ # both it and "1" since similarly to the
+ # extended match above it is the same as
+ # \([\d]\|\). POSIX extended would
+ # match neither.
+ git -c grep.patternType=perl log --pretty=tformat:%s \
+ --grep="[\d]\|" >actual.perl &&
+ test_cmp expect.perl actual.perl
+ fi &&
+ test_cmp expect.fixed actual.fixed &&
+ test_cmp expect.basic actual.basic &&
+ test_cmp expect.extended actual.extended &&
+
+ git log --pretty=tformat:%s -F \
+ --grep="(1|2)" >actual.fixed.short-arg &&
+ git log --pretty=tformat:%s -E \
+ --grep="\|2" >actual.extended.short-arg &&
+ test_cmp expect.fixed actual.fixed.short-arg &&
+ test_cmp expect.extended actual.extended.short-arg &&
+
+ git log --pretty=tformat:%s --fixed-strings \
+ --grep="(1|2)" >actual.fixed.long-arg &&
+ git log --pretty=tformat:%s --basic-regexp \
+ --grep="(.|.)" >actual.basic.long-arg &&
+ git log --pretty=tformat:%s --extended-regexp \
+ --grep="\|2" >actual.extended.long-arg &&
+ if test_have_prereq PCRE
+ then
+ git log --pretty=tformat:%s --perl-regexp \
+ --grep="[\d]\|" >actual.perl.long-arg &&
+ test_cmp expect.perl actual.perl.long-arg
+
+ fi &&
+ test_cmp expect.fixed actual.fixed.long-arg &&
+ test_cmp expect.basic actual.basic.long-arg &&
+ test_cmp expect.extended actual.extended.long-arg
+ )
+'
+
cat > expect <<EOF
* Second
* sixth
--
2.13.0.303.g4ebf302169