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parse-options API: add a usage_msg_optf()

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Add a usage_msg_optf() as a shorthand for the sort of
usage_msg_opt(xstrfmt(...)) used in builtin/stash.c. I'll make more
use of this function in builtin/cat-file.c shortly.

The disconnect between the "..." and "fmt" is a bit unusual, but it
works just fine and this keeps it consistent with usage_msg_opt(),
i.e. a caller of it can be moved to usage_msg_optf() and not have to
have its arguments re-arranged.

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
2021-12-28 14:28:43 +01:00
committed by Junio C Hamano
parent 68c69f90c8
commit fa476be8f0
3 changed files with 25 additions and 2 deletions
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10
parse-options.h
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@@ -225,6 +225,16 @@ NORETURN void usage_msg_opt(const char *msg,
const char * const *usagestr,
const struct option *options);
/**
* usage_msg_optf() is like usage_msg_opt() except that the first
* argument is a format string, and optional format arguments follow
* after the 3rd option.
*/
__attribute__((format (printf,1,4)))
void NORETURN usage_msg_optf(const char *fmt,
const char * const *usagestr,
const struct option *options, ...);
/*
* Use these assertions for callbacks that expect to be called with NONEG and
* NOARG respectively, and do not otherwise handle the "unset" and "arg"