linux-kernel - [PATCH 26/42] perf tools: Check existence of _get_comp_words_by

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Date:	Thu,  4 Oct 2012 15:08:26 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 26/42] perf tools: Check existence of _get_comp_words_by_ref when bash completing

From: Namhyung Kim <namhyung@...nel.org>

The '_get_comp_words_by_ref' function is available from the bash
completion v1.2 so that earlier version emits following warning:

  $ perf re<TAB>_get_comp_words_by_ref: command not found

Use older '_get_cword' method when the above function doesn't exist.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1349191294-6926-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/bash_completion |   15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/perf/bash_completion b/tools/perf/bash_completion
index 1958fa5..3d48cee 100644
--- a/tools/perf/bash_completion
+++ b/tools/perf/bash_completion
@@ -1,12 +1,23 @@
 # perf completion
 
+function_exists()
+{
+	declare -F $1 > /dev/null
+	return $?
+}
+
 have perf &&
 _perf()
 {
-	local cur cmd
+	local cur prev cmd
 
 	COMPREPLY=()
-	_get_comp_words_by_ref cur prev
+	if function_exists _get_comp_words_by_ref; then
+		_get_comp_words_by_ref cur prev
+	else
+		cur=$(_get_cword)
+		prev=${COMP_WORDS[COMP_CWORD-1]}
+	fi
 
 	cmd=${COMP_WORDS[0]}
 
-- 
1.7.1

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