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format-patch: allow --range-diff to apply to a lone-patch

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When submitting a revised version of a patch or series, it can be
helpful (to reviewers) to include a summary of changes since the
previous attempt in the form of a range-diff, typically in the cover
letter. However, it is occasionally useful, despite making for a noisy
read, to insert a range-diff into the commentary section of the lone
patch of a 1-patch series.

Therefore, extend "git format-patch --range-diff=<refspec>" to insert a
range-diff into the commentary section of a lone patch rather than
requiring a cover letter.

Implementation note: Generating a range-diff for insertion into the
commentary section of a patch which itself is currently being generated
requires invoking the diffing machinery recursively. However, the
machinery does not (presently) support this since it uses global state.
Consequently, we need to take care to stash away the state of the
in-progress operation while generating the range-diff, and restore it
after.

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 05:57:17 -04:00
committed by Junio C Hamano
parent 8631bf1cdd
commit 40ce41604d
3 changed files with 22 additions and 5 deletions
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9
builtin/log.c
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@ -1576,7 +1576,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
N_("show changes against <rev> in cover letter or single patch"),
parse_opt_object_name),
OPT_STRING(0, "range-diff", &rdiff_prev, N_("refspec"),
N_("show changes against <refspec> in cover letter")),
N_("show changes against <refspec> in cover letter or single patch")),
OPT_INTEGER(0, "creation-factor", &creation_factor,
N_("percentage by which creation is weighted")),
OPT_END()
@ -1817,8 +1817,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
die(_("--creation-factor requires --range-diff"));
if (rdiff_prev) {
if (!cover_letter)
die(_("--range-diff requires --cover-letter"));
if (!cover_letter && total != 1)
die(_("--range-diff requires --cover-letter or single patch"));
infer_range_diff_ranges(&rdiff1, &rdiff2, rdiff_prev,
origin, list[0]);
@ -1867,8 +1867,9 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
print_signature(rev.diffopt.file);
total++;
start_number--;
/* interdiff in cover-letter; omit from patches */
/* interdiff/range-diff in cover-letter; omit from patches */
rev.idiff_oid1 = NULL;
rev.rdiff1 = NULL;
}
rev.add_signoff = do_signoff;