perf tools: Long option completion support for each subcommands

Add internal --list-opts option to print all of long option names to
stdout so that it can be used for bash completion engine.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1349191294-6926-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 16 insertions, 2 deletions

diff --git a/tools/perf/bash_completion b/tools/perf/bash_completion
index bef06f0deeb5..5c355ababf80 100644
--- a/tools/perf/bash_completion
+++ b/tools/perf/bash_completion
@@ -33,8 +33,13 @@ _perf()
                 fi
         # List possible events for -e option
         elif [[ $prev == "-e" && "${COMP_WORDS[1]}" == @(record|stat|top) ]]; then
-                cmds=$($cmd list --raw-dump)
-                COMPREPLY=( $( compgen -W '$cmds' -- "$cur" ) )
+                evts=$($cmd list --raw-dump)
+                COMPREPLY=( $( compgen -W '$evts' -- "$cur" ) )
+        # List long option names
+        elif [[ $cur == --* ]];  then
+                subcmd=${COMP_WORDS[1]}
+                opts=$($cmd $subcmd --list-opts)
+                COMPREPLY=( $( compgen -W '$opts' -- "$cur" ) )
         # Fall down to list regular files
         else
                 _filedir
diff --git a/tools/perf/util/parse-options.c b/tools/perf/util/parse-options.c
index 443fc116512b..2bc9e70df7e2 100644
--- a/tools/perf/util/parse-options.c
+++ b/tools/perf/util/parse-options.c
@@ -384,6 +384,8 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
                         return usage_with_options_internal(usagestr, options, 1);
                 if (internal_help && !strcmp(arg + 2, "help"))
                         return parse_options_usage(usagestr, options);
+                if (!strcmp(arg + 2, "list-opts"))
+                        return PARSE_OPT_LIST;
                 switch (parse_long_opt(ctx, arg + 2, options)) {
                 case -1:
                         return parse_options_usage(usagestr, options);
@@ -422,6 +424,12 @@ int parse_options(int argc, const char **argv, const struct option *options,
                 exit(129);
         case PARSE_OPT_DONE:
                 break;
+        case PARSE_OPT_LIST:
+                while (options->type != OPTION_END) {
+                        printf("--%s ", options->long_name);
+                        options++;
+                }
+                exit(130);
         default: /* PARSE_OPT_UNKNOWN */
                 if (ctx.argv[0][1] == '-') {
                         error("unknown option `%s'", ctx.argv[0] + 2);
diff --git a/tools/perf/util/parse-options.h b/tools/perf/util/parse-options.h
index abc31a1dac1a..7bb5999940ca 100644
--- a/tools/perf/util/parse-options.h
+++ b/tools/perf/util/parse-options.h
@@ -140,6 +140,7 @@ extern NORETURN void usage_with_options(const char * const *usagestr,
 enum {
         PARSE_OPT_HELP = -1,
         PARSE_OPT_DONE,
+        PARSE_OPT_LIST,
         PARSE_OPT_UNKNOWN,
 };