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 <[email protected]>
Acked-by: Frederic Weisbecker <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

diff --git a/tools/perf/bash_completion b/tools/perf/bash_completion
index 1958fa539d0f8085f64e897c448ba2ac59eef956..3d48cee1b5e50452440176ca59c370598ca10551 100644 (file)
--- 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]}