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| author |  Ævar Arnfjörð Bjarmason <avarab@gmail.com> | 2021-04-12 19:15:26 +0200 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2021-05-11 12:47:31 +0900 |
| commit | fa59e7beb2a61d9cd1312b212075edf12935fdc6 (patch) | |
| tree | b2c976fdc144757d9681c993a88d83423aa7df78 | |
| parent | xdiff-interface: allow early return from xdiff_emit_line_fn (diff) | |
| download | tgif-fa59e7beb2a61d9cd1312b212075edf12935fdc6.tar.xz | |
pickaxe -G: terminate early on matching lines
Solve a long-standing item for "git log -Grx" of us e.g. finding "+
str" in the diff context and noting that we had a "hit", but xdiff
diligently continuing to generate and spew the rest of the diff at
us. This makes use of a new "early return" xdiff interface added by
preceding commits.
The TODO item (or, the NEEDSWORK comment) has been there since "git
log -G" was implemented. See f506b8e8b5f (git log/diff: add -G<regexp>
that greps in the patch text, 2010-08-23).
But now with the support added in the preceding changes to the
xdiff-interface we can return early. Let's assert the behavior of that
new early-return xdiff-interface by having a BUG() call here to die if
it ever starts handing us needless work again.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
| -rw-r--r-- | diffcore-pickaxe.c | 30 | ||||
| -rw-r--r-- | xdiff-interface.h | 4 |
2 files changed, 23 insertions, 11 deletions
diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c index 27aa20be35..2147afef72 100644 --- a/diffcore-pickaxe.c +++ b/diffcore-pickaxe.c @@ -27,13 +27,12 @@ static int diffgrep_consume(void *priv, char *line, unsigned long len) if (line[0] != '+' && line[0] != '-') return 0; if (data->hit) - /* - * NEEDSWORK: we should have a way to terminate the - * caller early. - */ - return 0; - data->hit = !regexec_buf(data->regexp, line + 1, len - 1, 1, - ®match, 0); + BUG("Already matched in diffgrep_consume! Broken xdiff_emit_line_fn?"); + if (!regexec_buf(data->regexp, line + 1, len - 1, 1, + ®match, 0)) { + data->hit = 1; + return 1; + } return 0; } @@ -45,6 +44,7 @@ static int diff_grep(mmfile_t *one, mmfile_t *two, struct diffgrep_cb ecbdata; xpparam_t xpp; xdemitconf_t xecfg; + int ret; if (!one) return !regexec_buf(regexp, two->ptr, two->size, @@ -63,10 +63,18 @@ static int diff_grep(mmfile_t *one, mmfile_t *two, ecbdata.hit = 0; xecfg.ctxlen = o->context; xecfg.interhunkctxlen = o->interhunkcontext; - if (xdi_diff_outf(one, two, discard_hunk_line, diffgrep_consume, - &ecbdata, &xpp, &xecfg)) - return 0; - return ecbdata.hit; + + /* + * An xdiff error might be our "data->hit" from above. See the + * comment for xdiff_emit_line_fn in xdiff-interface.h + */ + ret = xdi_diff_outf(one, two, discard_hunk_line, diffgrep_consume, + &ecbdata, &xpp, &xecfg); + if (ecbdata.hit) + return 1; + if (ret) + return ret; + return 0; } static unsigned int contains(mmfile_t *mf, regex_t *regexp, kwset_t kws, diff --git a/xdiff-interface.h b/xdiff-interface.h index 7d1724abb6..3b6819586d 100644 --- a/xdiff-interface.h +++ b/xdiff-interface.h @@ -27,6 +27,10 @@ * doing so will currently make your early return indistinguishable * 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. */ typedef int (*xdiff_emit_line_fn)(void *, char *, unsigned long); typedef void (*xdiff_emit_hunk_fn)(void *data, |