linux-kernel - [tip:perf/core] perf tools: Handle -h and -v options

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Date:	Tue, 6 Oct 2015 00:15:37 -0700
From:	tip-bot for Jiri Olsa <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	a.p.zijlstra@...llo.nl, tglx@...utronix.de, namhyung@...nel.org,
	jolsa@...nel.org, kan.liang@...el.com, peterz@...radead.org,
	hpa@...or.com, acme@...hat.com, mingo@...nel.org,
	dzickus@...hat.com, dsahern@...il.com, linux-kernel@...r.kernel.org
Subject: [tip:perf/core] perf tools: Handle -h and -v options

Commit-ID:  a1853e2c6f8ed488adcd84fb162c5b3f0b674d9b
Gitweb:     http://git.kernel.org/tip/a1853e2c6f8ed488adcd84fb162c5b3f0b674d9b
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Mon, 5 Oct 2015 20:06:09 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 5 Oct 2015 16:36:18 -0300

perf tools: Handle -h and -v options

Adding handling for '-h' and '-v' options to invoke help and version
command respectively.

Current behaviour is:

   $ perf -v
   Unknown option: -v

    Usage: perf [--version] [--help] [OPTIONS] COMMAND [ARGS]
   $ perf -h
   Unknown option: -h

    Usage: perf [--version] [--help] [OPTIONS] COMMAND [ARGS]

New behaviour:

  $ perf -h

   usage: perf [--version] [--help] [OPTIONS] COMMAND [ARGS]

   The most commonly used perf commands are:
     annotate        Read perf.data (created by perf record) and display annotated code
     archive         Create archive with object files with build-ids found in perf.data file
     bench           General framework for benchmark suites
   ...

  $ perf -v
  perf version 4.3.rc3.gc99e32

Updated man page.

Requested-by: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1444068369-20978-10-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/Documentation/perf.txt |  8 ++++++++
 tools/perf/perf.c                 | 14 ++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/tools/perf/Documentation/perf.txt b/tools/perf/Documentation/perf.txt
index 2b13177..864e375 100644
--- a/tools/perf/Documentation/perf.txt
+++ b/tools/perf/Documentation/perf.txt
@@ -27,6 +27,14 @@ OPTIONS
 	Setup buildid cache directory. It has higher priority than
 	buildid.dir config file option.
 
+-v::
+--version::
+  Display perf version.
+
+-h::
+--help::
+  Run perf help command.
+
 DESCRIPTION
 -----------
 Performance counters for Linux are a new kernel-based subsystem
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 1fded92..5437134 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -162,6 +162,20 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
 			break;
 
 		/*
+		 * Shortcut for '-h' and '-v' options to invoke help
+		 * and version command.
+		 */
+		if (!strcmp(cmd, "-h")) {
+			(*argv)[0] = "--help";
+			break;
+		}
+
+		if (!strcmp(cmd, "-v")) {
+			(*argv)[0] = "--version";
+			break;
+		}
+
+		/*
 		 * Check remaining flags.
 		 */
 		if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
--
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