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pickaxe: refactor function selection in diffcore-pickaxe()

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It's hard to read this codepath at a glance and reason about exactly
what combination of -G and -S will compile either regexes or kwset,
and whether we'll then dispatch to "diff_grep" or "has_changes".

Then in the "--find-object" case we aren't using the callback
function, but were previously passing down "has_changes".

Refactor this code to exhaustively check "opts", it's now more obvious
what callback function (or none) we want under what mode.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2021-04-12 19:15:19 +02:00 committed by Junio C Hamano
parent d90d441c33
commit 03c1f14acf
1 changed files with 21 additions and 2 deletions
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23
diffcore-pickaxe.c
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@ -228,6 +228,7 @@ void diffcore_pickaxe(struct diff_options *o)
int opts = o->pickaxe_opts;
regex_t regex, *regexp = NULL;
kwset_t kws = NULL;
pickaxe_fn fn;
if (opts & (DIFF_PICKAXE_REGEX | DIFF_PICKAXE_KIND_G)) {
int cflags = REG_EXTENDED | REG_NEWLINE;
@ -235,6 +236,20 @@ void diffcore_pickaxe(struct diff_options *o)
cflags |= REG_ICASE;
regcomp_or_die(&regex, needle, cflags);
regexp = &regex;
if (opts & DIFF_PICKAXE_KIND_G)
fn = diff_grep;
else if (opts & DIFF_PICKAXE_REGEX)
fn = has_changes;
else
/*
* We don't need to check the combination of
* -G and --pickaxe-regex, by the time we get
* here diff.c has already died if they're
* combined. See the usage tests in
* t4209-log-pickaxe.sh.
*/
BUG("unreachable");
} else if (opts & DIFF_PICKAXE_KIND_S) {
if (o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE &&
has_non_ascii(needle)) {
@ -251,10 +266,14 @@ void diffcore_pickaxe(struct diff_options *o)
kwsincr(kws, needle, strlen(needle));
kwsprep(kws);
}
fn = has_changes;
} else if (opts & DIFF_PICKAXE_KIND_OBJFIND) {
fn = NULL;
} else {
BUG("unknown pickaxe_opts flag");
}
pickaxe(&diff_queued_diff, o, regexp, kws,
(opts & DIFF_PICKAXE_KIND_G) ? diff_grep : has_changes);
pickaxe(&diff_queued_diff, o, regexp, kws, fn);
if (regexp)
regfree(regexp);