From 2df3799e3d3fe60ff6ed6159cd935d4356be70c3 Mon Sep 17 00:00:00 2001
From: fauxpark <fauxpark@gmail.com>
Date: Sat, 21 Sep 2019 17:00:58 +1000
Subject: [PATCH] Add list-keymaps make target (#5563)

---
 Makefile   | 13 +++++++++++++
 message.mk |  5 +++++
 2 files changed, 18 insertions(+)

diff --git a/Makefile b/Makefile
index 37f5f23dbe7..508691f45f1 100644
--- a/Makefile
+++ b/Makefile
@@ -371,6 +371,9 @@ define PARSE_KEYBOARD
     # The same if all was specified
     else ifeq ($$(call COMPARE_AND_REMOVE_FROM_RULE,all),true)
         $$(eval $$(call PARSE_ALL_KEYMAPS))
+    # List all keymaps for the given keyboard
+    else ifeq ($$(call COMPARE_AND_REMOVE_FROM_RULE,list-keymaps),true)
+        $$(eval $$(call LIST_ALL_KEYMAPS))
     # Try to match the specified keyamp with the list of known keymaps
     else ifeq ($$(call TRY_TO_MATCH_RULE_FROM_LIST,$$(KEYMAPS)),true)
         $$(eval $$(call PARSE_KEYMAP,$$(MATCHED_ITEM)))
@@ -407,6 +410,16 @@ endef
 #     endif
 # endef
 
+# Prints a list of all known keymaps for the given keyboard
+define LIST_ALL_KEYMAPS
+    COMMAND_true_LIST_KEYMAPS := \
+        printf "$$(KEYMAPS)\n";
+    COMMAND_false_LIST_KEYMAPS := \
+        printf "$$(MSG_AVAILABLE_KEYMAPS)\n"; \
+        printf "$$(KEYMAPS)\n";
+    COMMANDS += LIST_KEYMAPS
+endef
+
 # $1 Keymap
 # This is the meat of compiling a keyboard, when entering this, everything is known
 # keyboard, subproject, and keymap
diff --git a/message.mk b/message.mk
index dfbde2845be..53afba20655 100644
--- a/message.mk
+++ b/message.mk
@@ -76,6 +76,11 @@ define GENERATE_MSG_MAKE_TEST
 endef
 MSG_MAKE_TEST = $(eval $(call GENERATE_MSG_MAKE_TEST))$(MSG_MAKE_TEST_ACTUAL)
 MSG_TEST = Testing $(BOLD)$(TEST_NAME)$(NO_COLOR)
+define GENERATE_MSG_AVAILABLE_KEYMAPS
+    MSG_AVAILABLE_KEYMAPS_ACTUAL := Available keymaps for $(BOLD)$$(CURRENT_KB)$(NO_COLOR):
+endef
+MSG_AVAILABLE_KEYMAPS = $(eval $(call GENERATE_MSG_AVAILABLE_KEYMAPS))$(MSG_AVAILABLE_KEYMAPS_ACTUAL)
+
 MSG_CHECK_FILESIZE = Checking file size of $(TARGET).hex
 MSG_FILE_TOO_BIG = $(ERROR_COLOR)The firmware is too large!$(NO_COLOR) $(CURRENT_SIZE)/$(MAX_SIZE) ($(OVER_SIZE) bytes over)\n
 MSG_FILE_TOO_SMALL = The firmware is too small! $(CURRENT_SIZE)/$(MAX_SIZE)\n