[tip:perf/urgent] perf tools: Check existence of _get_comp_words_by_ref when bash completing

[tip-bot for Namhyung Kim]

Commit-ID:  a1d668c3ffd38d611f8446615e8f797dcfdfc397
Gitweb:     http://git.kernel.org/tip/a1d668c3ffd38d611f8446615e8f797dcfdfc397
Author:     Namhyung Kim <namhyung@xxxxxxxxxx>
AuthorDate: Wed, 3 Oct 2012 00:21:32 +0900
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 2 Oct 2012 18:36:42 -0300

perf tools: Check existence of _get_comp_words_by_ref when bash completing

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@xxxxxxxxxx>
Acked-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1349191294-6926-2-git-send-email-namhyung@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 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]}
 
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