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format-patch: "--rfc=-(WIP)" appends to produce [PATCH (WIP)]

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In the previous step, the "--rfc" option of "format-patch" learned
to take an optional string value to prepend to the subject prefix,
so that --rfc=WIP can give "[WIP PATCH]".

There may be cases in which the extra string wants to come after the
subject prefix.  Extend the mechanism to allow "--rfc=-(WIP)" [*] to
signal that the extra string is to be appended instead of getting
prepended, resulting in "[PATCH (WIP)]".

In the documentation, discourage (ab)using "--rfc=-RFC" to say
"[PATCH RFC]" just to be different, when "[RFC PATCH]" is the norm.

[Footnote]

 * The syntax takes inspiration from Perl's open syntax that opens
   pipes "open fh, '|-', 'cmd'", where the dash signals "the other
   stuff comes here".

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2024-04-23 10:52:34 -07:00
parent ce48fb2eab
commit ce36894509
3 changed files with 21 additions and 2 deletions
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8
builtin/log.c
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@ -2065,8 +2065,12 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
if (cover_from_description_arg)
cover_from_description_mode = parse_cover_from_description(cover_from_description_arg);
if (rfc && rfc[0])
strbuf_insertf(&sprefix, 0, "%s ", rfc);
if (rfc && rfc[0]) {
if (rfc[0] == '-')
strbuf_addf(&sprefix, " %s", rfc + 1);
else
strbuf_insertf(&sprefix, 0, "%s ", rfc);
}
if (reroll_count) {
strbuf_addf(&sprefix, " v%s", reroll_count);