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parse-options: allow -h as a short option

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Let callers provide their own handler for the short option -h even
without the flag PARSE_OPT_NO_INTERNAL_HELP, but call the internal
handler (showing usage information) if that is the only parameter.
Implement the first part by checking for -h only if parse_short_opt()
can't find it and returns -2.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Jeff King <peff@peff.net>
This commit is contained in:
René Scharfe 2015-11-17 11:25:38 +01:00 committed by Jeff King
parent d3d1f8c46f
commit 5ad0d3d526
2 changed files with 11 additions and 6 deletions
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15
parse-options.c
View File

@ -410,7 +410,7 @@ void parse_options_start(struct parse_opt_ctx_t *ctx,
const struct option *options, int flags)
{
memset(ctx, 0, sizeof(*ctx));
ctx->argc = argc - 1;
ctx->argc = ctx->total = argc - 1;
ctx->argv = argv + 1;
ctx->out = argv;
ctx->prefix = prefix;
@ -448,27 +448,32 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
continue;
}
/* lone -h asks for help */
if (internal_help && ctx->total == 1 && !strcmp(arg + 1, "h"))
goto show_usage;
if (arg[1] != '-') {
ctx->opt = arg + 1;
if (internal_help && *ctx->opt == 'h')
goto show_usage;
switch (parse_short_opt(ctx, options)) {
case -1:
goto show_usage_error;
case -2:
if (ctx->opt)
check_typos(arg + 1, options);
if (internal_help && *ctx->opt == 'h')
goto show_usage;
goto unknown;
}
if (ctx->opt)
check_typos(arg + 1, options);
while (ctx->opt) {
if (internal_help && *ctx->opt == 'h')
goto show_usage;
switch (parse_short_opt(ctx, options)) {
case -1:
goto show_usage_error;
case -2:
if (internal_help && *ctx->opt == 'h')
goto show_usage;
/* fake a short option thing to hide the fact that we may have
* started to parse aggregated stuff
*

2
parse-options.h
View File

@ -199,7 +199,7 @@ enum {
struct parse_opt_ctx_t {
const char **argv;
const char **out;
int argc, cpidx;
int argc, cpidx, total;
const char *opt;
int flags;
const char *prefix;