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perf tools: Setup pager when printing usage and help 

It's annoying to see error or help message when command has many options
like in perf record, report or top.  So setup pager when print parser
error or help message - it should be OK since no UI is enabled at the
parsing time.  The usage_with_options() already disables it by calling
exit_browser() anyway.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1445701767-12731-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2015-10-25 00:49:26 +09:00 committed by Arnaldo Carvalho de Melo
parent b272a59d83
commit 01b19455c0
1 changed files with 13 additions and 2 deletions
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15
tools/perf/util/parse-options.c
View File

@ -7,6 +7,8 @@
#define OPT_SHORT 1
#define OPT_UNSET 2
static struct strbuf error_buf = STRBUF_INIT;
static int opterror(const struct option *opt, const char *reason, int flags)
{
if (flags & OPT_SHORT)
@ -540,9 +542,11 @@ int parse_options_subcommand(int argc, const char **argv, const struct option *o
exit(130);
default: /* PARSE_OPT_UNKNOWN */
if (ctx.argv[0][1] == '-') {
error("unknown option `%s'", ctx.argv[0] + 2);
strbuf_addf(&error_buf, "unknown option `%s'",
ctx.argv[0] + 2);
} else {
error("unknown switch `%c'", *ctx.opt);
strbuf_addf(&error_buf, "unknown switch `%c'",
*ctx.opt);
}
usage_with_options(usagestr, options);
}
@ -711,6 +715,13 @@ int usage_with_options_internal(const char * const *usagestr,
if (!usagestr)
return PARSE_OPT_HELP;
setup_pager();
if (strbuf_avail(&error_buf)) {
fprintf(stderr, " Error: %s\n", error_buf.buf);
strbuf_release(&error_buf);
}
fprintf(stderr, "\n Usage: %s\n", *usagestr++);
while (*usagestr && **usagestr)
fprintf(stderr, " or: %s\n", *usagestr++);