perf tools: Fix the bash completion for listing options of perf subcommand

The bash completion does not support listing options for 'perf
kvm|kmem|mem|lock|sched --<TAB>', where 'kvm|kmem|mem|lock|sched' are
all subcommands of perf.

Example:

Before this patch:

 $ perf kvm --<TAB>
 $

As shown above, the options of perf kvm does not come out.

After this patch:

 $ perf kvm --<TAB>
 --alloc    --caller   --input    --line     --raw-ip   --sort
 --verbose

As shown above, the options of perf kvm can come out now.

Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1426685758-25488-2-git-send-email-yunlong.song@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 12 insertions, 9 deletions

diff --git a/tools/perf/perf-completion.sh b/tools/perf/perf-completion.sh
index c2595e9bd69b..4822ed38e23e 100644
--- a/tools/perf/perf-completion.sh
+++ b/tools/perf/perf-completion.sh
@@ -119,15 +119,18 @@ __perf_main ()
         elif [[ $prev == "-e" && "${words[1]}" == @(record|stat|top) ]]; then
                 evts=$($cmd list --raw-dump)
                 __perfcomp_colon "$evts" "$cur"
-        # List subcommands for perf commands
-        elif [[ $prev == @(kvm|kmem|mem|lock|sched) ]]; then
-                subcmds=$($cmd $prev --list-cmds)
-                __perfcomp_colon "$subcmds" "$cur"
-        # List long option names
-        elif [[ $cur == --* ]];  then
-                subcmd=${words[1]}
-                opts=$($cmd $subcmd --list-opts)
-                __perfcomp "$opts" "$cur"
+        else
+                # List subcommands for perf commands
+                if [[ $prev == @(kvm|kmem|mem|lock|sched) ]]; then
+                        subcmds=$($cmd $prev --list-cmds)
+                        __perfcomp_colon "$subcmds" "$cur"
+                fi
+                # List long option names
+                if [[ $cur == --* ]];  then
+                        subcmd=${words[1]}
+                        opts=$($cmd $subcmd --list-opts)
+                        __perfcomp "$opts" "$cur"
+                fi
         fi
 }