perf tools: Initial bash completion support

This implements bash completion for perf subcommands such as record,
report, script, probe, etc...

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1344522713-27951-2-git-send-email-fweisbec@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/bash_completion b/tools/perf/bash_completion
new file mode 100644
index 0000000..9a31fa5
--- /dev/null
+++ b/tools/perf/bash_completion
@@ -0,0 +1,22 @@
+# perf completion
+
+have perf &&
+_perf()
+{
+	local cur cmd
+
+	COMPREPLY=()
+	_get_comp_words_by_ref cur
+
+	cmd=${COMP_WORDS[0]}
+
+	# List perf subcommands
+	if [ $COMP_CWORD -eq 1 ]; then
+		cmds=$($cmd --list-cmds)
+		COMPREPLY=( $( compgen -W '$cmds' -- "$cur" ) )
+	# Fall down to list regular files
+	else
+		_filedir
+	fi
+} &&
+complete -F _perf perf