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format-patch: extend --range-diff to accept revision range

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When submitting a revised a patch series, the --range-diff option embeds
a range-diff in the cover letter showing changes since the previous
version of the patch series. The argument to --range-diff is a simple
revision naming the tip of the previous series, which works fine if the
previous and current versions of the patch series share a common base.

However, it fails if the revision ranges of the old and new versions of
the series are disjoint. To address this shortcoming, extend
--range-diff to also accept an explicit revision range for the previous
series. For example:

    git format-patch --cover-letter --range-diff=v1~3..v1 -3 v2

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Sunshine
2018-07-22 05:57:14 -04:00
committed by Junio C Hamano
parent 31e2617a5f
commit 2e6fd71a52
3 changed files with 19 additions and 7 deletions
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16
builtin/log.c
View File

@ -1448,12 +1448,21 @@ static const char *diff_title(struct strbuf *sb, int reroll_count,
static void infer_range_diff_ranges(struct strbuf *r1,
struct strbuf *r2,
const char *prev,
struct commit *origin,
struct commit *head)
{
const char *head_oid = oid_to_hex(&head->object.oid);
strbuf_addf(r1, "%s..%s", head_oid, prev);
strbuf_addf(r2, "%s..%s", prev, head_oid);
if (!strstr(prev, "..")) {
strbuf_addf(r1, "%s..%s", head_oid, prev);
strbuf_addf(r2, "%s..%s", prev, head_oid);
} else if (!origin) {
die(_("failed to infer range-diff ranges"));
} else {
strbuf_addstr(r1, prev);
strbuf_addf(r2, "%s..%s",
oid_to_hex(&origin->object.oid), head_oid);
}
}
int cmd_format_patch(int argc, const char **argv, const char *prefix)
@ -1802,7 +1811,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
if (!cover_letter)
die(_("--range-diff requires --cover-letter"));
infer_range_diff_ranges(&rdiff1, &rdiff2, rdiff_prev, list[0]);
infer_range_diff_ranges(&rdiff1, &rdiff2, rdiff_prev,
origin, list[0]);
rev.rdiff1 = rdiff1.buf;
rev.rdiff2 = rdiff2.buf;
rev.creation_factor = RANGE_DIFF_CREATION_FACTOR_DEFAULT;