linux-kernel - [PATCH 3/4] perf tools: Setup pager when printing usage and help

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Date:	Sun, 25 Oct 2015 00:49:26 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>
Subject: [PATCH 3/4] 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@...nel.org>
---
 tools/perf/util/parse-options.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/parse-options.c b/tools/perf/util/parse-options.c
index b8d98229a8af..eeeed98eb26d 100644
--- a/tools/perf/util/parse-options.c
+++ b/tools/perf/util/parse-options.c
@@ -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++);
-- 
2.6.0

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