help: add --config to list all available config

Sometimes it helps to list all available config vars so the user can
search for something they want. The config man page can also be used
but it's harder to search if you want to focus on the variable name,
for example.

This is not the best way to collect the available config since it's
not precise. Ideally we should have a centralized list of config in C
code (pretty much like 'struct option'), but that's a lot more work.
This will do for now.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/advice.c b/advice.c
index 370a56d05..cf6c673ed 100644
--- a/advice.c
+++ b/advice.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "config.h"
 #include "color.h"
+#include "help.h"
 
 int advice_push_update_rejected = 1;
 int advice_push_non_ff_current = 1;
@@ -131,6 +132,14 @@ int git_default_advice_config(const char *var, const char *value)
 	return 0;
 }
 
+void list_config_advices(struct string_list *list, const char *prefix)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(advice_config); i++)
+		list_config_item(list, prefix, advice_config[i].name);
+}
+
 int error_resolve_conflict(const char *me)
 {
 	if (!strcmp(me, "cherry-pick"))