[PATCH v4 4/5] perf config: Add a option 'list-all' to perf-config

[Taeung Song]

A option 'list-all' is to display both current config variables and
all possible config variables with default values.
The syntax examples are like below

    perf config [options]

    display all perf config with default values.
    # perf config -a | --list-all

Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 tools/perf/Documentation/perf-config.txt |  6 ++++
 tools/perf/builtin-config.c              | 48 ++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/tools/perf/Documentation/perf-config.txt 
b/tools/perf/Documentation/perf-config.txt
index cd4b1a6..d8b3acc 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -11,6 +11,8 @@ SYNOPSIS
 'perf config' [<file-option>] [section.name[=value] ...]
 or
 'perf config' [<file-option>] -l | --list
+or
+'perf config' [<file-option>] -a | --list-all
 
 DESCRIPTION
 -----------
@@ -31,6 +33,10 @@ OPTIONS
        For writing and reading options: write to system-wide
        '$(sysconfdir)/perfconfig' or read it.
 
+-a::
+--list-all::
+       Show current and all possible config variables with default values.
+
 CONFIGURATION FILE
 ------------------
 
diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 6d9f28c..f4a1569 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -23,6 +23,7 @@ static const char * const config_usage[] = {
 };
 
 #define ACTION_LIST (1<<0)
+#define ACTION_LIST_ALL (1<<1)
 
 static const struct option config_options[] = {
        OPT_GROUP("Config file location"),
@@ -31,6 +32,8 @@ static const struct option config_options[] = {
        OPT_GROUP("Action"),
        OPT_BIT('l', "list", &actions,
                "show current config variables", ACTION_LIST),
+       OPT_BIT('a', "list-all", &actions,
+               "show current and all possible config variables with default 
values", ACTION_LIST_ALL),
        OPT_END()
 };
 
@@ -539,6 +542,45 @@ static int collect_current_config(const char *var, const 
char *value,
                           normalize_value(section_name, name, value));
 }
 
+static int show_all_config(void)
+{
+       int i;
+       bool has_config;
+       struct config_section *section_node;
+       struct config_element *element_node;
+
+       for (i = 0; default_configsets[i].section_name != NULL; i++) {
+               find_config(&section_node, &element_node,
+                           default_configsets[i].section_name, 
default_configsets[i].name);
+
+               if (!element_node)
+                       printf("%s.%s=%s\n", default_configsets[i].section_name,
+                              default_configsets[i].name, 
default_configsets[i].value);
+               else
+                       printf("%s.%s=%s\n", section_node->name,
+                              element_node->name, element_node->value);
+       }
+
+       /* Print config variables the default configsets haven't */
+       list_for_each_entry(section_node, &sections, list) {
+               list_for_each_entry(element_node, &section_node->element_head, 
list) {
+                       has_config = false;
+                       for (i = 0; default_configsets[i].section_name != NULL; 
i++) {
+                               if (!strcmp(default_configsets[i].section_name, 
section_node->name)
+                                   && !strcmp(default_configsets[i].name, 
element_node->name)) {
+                                       has_config = true;
+                                       break;
+                               }
+                       }
+                       if (!has_config)
+                               printf("%s.%s=%s\n", section_node->name,
+                                      element_node->name, element_node->value);
+               }
+       }
+
+       return 0;
+}
+
 static int perf_configset_with_option(configset_fn_t fn, const char *var, char 
*value)
 {
        char *section_name;
@@ -617,6 +659,12 @@ int cmd_config(int argc, const char **argv, const char 
*prefix __maybe_unused)
                else
                        goto out_err;
                goto out;
+       case ACTION_LIST_ALL:
+               if (argc == 0)
+                       ret = show_all_config();
+               else
+                       goto out_err;
+               goto out;
        default:
                if ((!has_option || use_global_config || use_system_config)
                    && argc == 0) {
-- 
1.9.1

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