From: Johannes Schindelin <johannes.schindelin@xxxxxx>
The `--diff-filter=<bits>` option allows to filter the diff by certain
criteria, for example `R` to only show renamed files. It also supports
negating a filter via a down-cased letter, i.e. `r` to show _everything
but_ renamed files.
However, the code is a bit overzealous when trying to figure out whether
`git diff` should start with all diff-filters turned on because the user
provided a lower-case letter: if the `--diff-filter` argument starts
with an upper-case letter, we must not start with all bits turned on.
Even worse, it is possible to specify the diff filters in multiple,
separate options, e.g. `--diff-filter=AM [...] --diff-filter=m`.
Let's accumulate the include/exclude filters independently, and only
special-case the "only exclude filters were specified" case after
parsing the options altogether.
Note: The code replaced by this commit took pains to avoid setting any
unused bits of `options->filter`. That was unnecessary, though, as all
accesses happen via the `filter_bit_tst()` function using specific bits,
and setting the unused bits has no effect. Therefore, we can simplify
the code by using `~0` (or in this instance, `~<unwanted-bit>`).
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
diff.c | 23 +++++++----------------
diff.h | 2 +-
t/t4202-log.sh | 13 +++++++++++++
3 files changed, 21 insertions(+), 17 deletions(-)
diff --git a/diff.c b/diff.c
index 5081052c431..4ab4299b817 100644
--- a/diff.c
+++ b/diff.c
@@ -4720,6 +4720,12 @@ void diff_setup_done(struct diff_options *options)
if (!options->use_color || external_diff())
options->color_moved = 0;
+ if (options->filter_not) {
+ if (!options->filter)
+ options->filter = ~filter_bit[DIFF_STATUS_FILTER_AON];
+ options->filter &= ~options->filter_not;
+ }
+
FREE_AND_NULL(options->parseopts);
}
@@ -4820,21 +4826,6 @@ static int diff_opt_diff_filter(const struct option *option,
BUG_ON_OPT_NEG(unset);
prepare_filter_bits();
- /*
- * If there is a negation e.g. 'd' in the input, and we haven't
- * initialized the filter field with another --diff-filter, start
- * from full set of bits, except for AON.
- */
- if (!opt->filter) {
- for (i = 0; (optch = optarg[i]) != '\0'; i++) {
- if (optch < 'a' || 'z' < optch)
- continue;
- opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
- opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
- break;
- }
- }
-
for (i = 0; (optch = optarg[i]) != '\0'; i++) {
unsigned int bit;
int negate;
@@ -4851,7 +4842,7 @@ static int diff_opt_diff_filter(const struct option *option,
return error(_("unknown change class '%c' in --diff-filter=%s"),
optarg[i], optarg);
if (negate)
- opt->filter &= ~bit;
+ opt->filter_not |= bit;
else
opt->filter |= bit;
}
diff --git a/diff.h b/diff.h
index 8ba85c5e605..a70e7c478c1 100644
--- a/diff.h
+++ b/diff.h
@@ -283,7 +283,7 @@ struct diff_options {
struct diff_flags flags;
/* diff-filter bits */
- unsigned int filter;
+ unsigned int filter, filter_not;
int use_color;
diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index 50495598619..b25182379ff 100755
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -142,6 +142,19 @@ test_expect_success 'diff-filter=R' '
'
+test_expect_success 'multiple --diff-filter bits' '
+
+ git log -M --pretty="format:%s" --diff-filter=R HEAD >expect &&
+ git log -M --pretty="format:%s" --diff-filter=Ra HEAD >actual &&
+ test_cmp expect actual &&
+ git log -M --pretty="format:%s" --diff-filter=aR HEAD >actual &&
+ test_cmp expect actual &&
+ git log -M --pretty="format:%s" \
+ --diff-filter=a --diff-filter=R HEAD >actual &&
+ test_cmp expect actual
+
+'
+
test_expect_success 'diff-filter=C' '
git log -C -C --pretty="format:%s" --diff-filter=C HEAD >actual &&
--
gitgitgadget
