[PATCH v16 3/8] perf config: Add a option 'skel' to perf-config

[Taeung Song]

Produce an skeleton with the possible config variables so
that one could then use $EDITOR ~/.perfconfig or
$(sysconfdir)/perfconfigand go on setting the knobs.

For the syntax examples,

    # perf config -k | --skel
    Initialize the possible config variables on config file.
    # perf config --skel > ~/.perfconfig

Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Jiri Olsa <jo...@kernel.org>
Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 tools/perf/Documentation/perf-config.txt |  6 ++++++
 tools/perf/builtin-config.c              | 32 +++++++++++++++++++++++++++++++-
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-config.txt 
b/tools/perf/Documentation/perf-config.txt
index d9fb8c3..964879a 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -11,6 +11,8 @@ SYNOPSIS
 'perf config' [<file-option>] -l | --list
 or
 'perf config' [<file-option>] -a | --list-all
+or
+'perf config' [<file-option>] -k | --skel
 
 DESCRIPTION
 -----------
@@ -35,6 +37,10 @@ OPTIONS
 --list-all::
        Show current and all possible config variables with default values.
 
+-k::
+--skel::
+       Produce an skeleton with the possible config variables.
+
 CONFIGURATION FILE
 ------------------
 
diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 8a63119..6ab53b2 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -22,7 +22,8 @@ static const char * const config_usage[] = {
 
 enum actions {
        ACTION_LIST = 1,
-       ACTION_LIST_ALL
+       ACTION_LIST_ALL,
+       ACTION_SKEL
 } actions;
 
 static struct option config_options[] = {
@@ -31,6 +32,9 @@ static struct option config_options[] = {
        OPT_SET_UINT('a', "list-all", &actions,
                     "show current and all possible config"
                     " variables with default values", ACTION_LIST_ALL),
+       OPT_SET_UINT('k', "skel", &actions,
+                    "produce an skeleton with the possible"
+                    " config variables", ACTION_SKEL),
        OPT_BOOLEAN(0, "system", &use_system_config, "use system config file"),
        OPT_BOOLEAN(0, "user", &use_user_config, "use user config file"),
        OPT_END()
@@ -282,6 +286,26 @@ static char *get_value(struct config_item *config)
        return value;
 }
 
+static int show_skel_config(void)
+{
+       int i;
+       const char *section = "";
+
+       for (i = 0; default_configs[i].type != CONFIG_END; i++) {
+               struct config_item *config = &default_configs[i];
+               char *value = get_value(config);
+
+               if (strcmp(section, config->section) != 0) {
+                       section = config->section;
+                       printf("\n[%s]\n", config->section);
+               }
+               printf("\t%s = %s\n", config->name, value);
+               free(value);
+       }
+
+       return 0;
+}
+
 static int show_all_config(struct list_head *sections)
 {
        int i;
@@ -422,6 +446,12 @@ int cmd_config(int argc, const char **argv, const char 
*prefix __maybe_unused)
        perf_config(collect_current_config, &sections);
 
        switch (actions) {
+       case ACTION_SKEL:
+               if (argc)
+                       parse_options_usage(config_usage, config_options, "k", 
1);
+               else
+                       ret = show_skel_config();
+               break;
        case ACTION_LIST_ALL:
                if (argc == 0) {
                        ret = show_all_config(&sections);
-- 
2.5.0