diff: ensure consistent diff behavior with ignore options

index dca87e164f..cb04a9a6f2 100644 --- a/diff.c +++ b/diff.c @@ -2444,6 +2444,15 @@ static int fn_out_consume(void *priv, char *line, unsigned long len) return 0; } +static int quick_consume(void *priv, char *line UNUSED, unsigned long len UNUSED) +{ + struct emit_callback *ecbdata = priv; + struct diff_options *o = ecbdata->opt; + + o->found_changes = 1; + return 1; +} + static void pprint_rename(struct strbuf *name, const char *a, const char *b) { const char *old_name = a; @@ -3759,8 +3768,21 @@ static void builtin_diff(const char *name_a, if (o->word_diff) init_diff_words_data(&ecbdata, o, one, two); - if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume, - &ecbdata, &xpp, &xecfg)) + if (o->dry_run) { + /* + * Unlike the !dry_run case, we need to ignore the + * return value from xdi_diff_outf() here, because + * xdi_diff_outf() takes non-zero return from its + * callback function as a sign of error and returns + * early (which is why we return non-zero from our + * callback, quick_consume()). Unfortunately, + * xdi_diff_outf() signals an error by returning + * non-zero. + */ + xdi_diff_outf(&mf1, &mf2, NULL, quick_consume, + &ecbdata, &xpp, &xecfg); + } else if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume, + &ecbdata, &xpp, &xecfg)) die("unable to generate diff for %s", one->path); if (o->word_diff) free_diff_words_data(&ecbdata); @@ -6150,6 +6172,22 @@ static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o) run_diff(p, o); } +/* return 1 if any change is found; otherwise, return 0 */ +static int diff_flush_patch_quietly(struct diff_filepair *p, struct diff_options *o) +{ + int saved_dry_run = o->dry_run; + int saved_found_changes = o->found_changes; + int ret; + + o->dry_run = 1; + o->found_changes = 0; + diff_flush_patch(p, o); + ret = o->found_changes; + o->dry_run = saved_dry_run; + o->found_changes |= saved_found_changes; + return ret; +} + static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o, struct diffstat_t *diffstat) { @@ -6778,8 +6816,15 @@ void diff_flush(struct diff_options *options) DIFF_FORMAT_CHECKDIFF)) { for (i = 0; i < q->nr; i++) { struct diff_filepair *p = q->queue[i]; - if (check_pair_status(p)) - flush_one_pair(p, options); + + if (!check_pair_status(p)) + continue; + + if (options->flags.diff_from_contents && + !diff_flush_patch_quietly(p, options)) + continue; + + flush_one_pair(p, options); } separator++; } @@ -6831,19 +6876,10 @@ void diff_flush(struct diff_options *options) if (output_format & DIFF_FORMAT_NO_OUTPUT && options->flags.exit_with_status && options->flags.diff_from_contents) { - /* - * run diff_flush_patch for the exit status. setting - * options->file to /dev/null should be safe, because we - * aren't supposed to produce any output anyway. - */ - diff_free_file(options); - options->file = xfopen("/dev/null", "w"); - options->close_file = 1; - options->color_moved = 0; for (i = 0; i < q->nr; i++) { struct diff_filepair *p = q->queue[i]; if (check_pair_status(p)) - diff_flush_patch(p, options); + diff_flush_patch_quietly(p, options); if (options->found_changes) break; }

index 62e5768a9a..91b3e1c5cf 100644 --- a/diff.h +++ b/diff.h @@ -400,6 +400,8 @@ struct diff_options { #define COLOR_MOVED_WS_ERROR (1<<0) unsigned color_moved_ws_handling; + bool dry_run; + struct repository *repo; struct strmap *additional_path_headers;

index 8ebd170451..cfeec239e0 100755 --- a/t/t4013-diff-various.sh +++ b/t/t4013-diff-various.sh @@ -648,6 +648,19 @@ test_expect_success 'diff -I<regex>: detect malformed regex' ' test_grep "invalid regex given to -I: " error ' +test_expect_success 'diff -I<regex>: ignore matching file' ' + test_when_finished "git rm -f file1" && + test_seq 50 >file1 && + git add file1 && + test_seq 50 | sed -e "s/13/ten and three/" -e "s/^[124-9].*/& /" >file1 && + + : >actual && + git diff --raw --ignore-blank-lines -I"ten.*e" -I"^[124-9]" >>actual && + git diff --name-only --ignore-blank-lines -I"ten.*e" -I"^[124-9]" >>actual && + git diff --name-status --ignore-blank-lines -I"ten.*e" -I"^[124-9]" >>actual && + test_grep ! "file1" actual +' + # check_prefix <patch> <src> <dst> # check only lines with paths to avoid dependency on exact oid/contents check_prefix () {

index 52e3e476ff..9de7f73f42 100755 --- a/t/t4015-diff-whitespace.sh +++ b/t/t4015-diff-whitespace.sh @@ -11,12 +11,8 @@ test_description='Test special whitespace in diff engine. . "$TEST_DIRECTORY"/lib-diff.sh for opt_res in --patch --quiet -s --stat --shortstat --dirstat=lines \ - --raw! --name-only! --name-status! + --raw --name-only --name-status do - opts=${opt_res%!} expect_failure= - test "$opts" = "$opt_res" || - expect_failure="test_expect_code 1" - test_expect_success "status with $opts (different)" ' echo foo >x && git add x && @@ -43,7 +39,7 @@ do echo foo >x && git add x && echo " foo" >x && - $expect_failure git diff -w $opts --exit-code x + git diff -w $opts --exit-code x ' done

index 1ed430b622..dfc55daddf 100644 --- a/xdiff-interface.h +++ b/xdiff-interface.h @@ -28,9 +28,9 @@ * from an error internal to xdiff, xdiff itself will see that * non-zero return and translate it to -1. * - * See "diff_grep" in diffcore-pickaxe.c for a trick to work around - * this, i.e. using the "consume_callback_data" to note the desired - * early return. + * See "diff_grep" in diffcore-pickaxe.c and "quick_consume" in diff.c + * for a trick to work around this, i.e. using the "consume_callback_data" + * to note the desired early return. */ typedef int (*xdiff_emit_line_fn)(void *, char *, unsigned long); typedef void (*xdiff_emit_hunk_fn)(void *data,