Subproject parsing

Does not handle keyboards without subprojects correctly yet.

Makefile

@@ -51,6 +51,7 @@ $(info Keyboards: $(KEYBOARDS))
 # Otherwise the RULE_FOUND variable is set to false
 # The function is a bit tricky, since there's no built in $(startswith) function
 define COMPARE_AND_REMOVE_FROM_RULE
+    RULE_FOUND := false
     ifeq ($1,$$(RULE))
         RULE:=
         RULE_FOUND := true
@@ -70,11 +71,13 @@ endef
 # If a match is found, then RULE_FOUND is set to true
 # and MATCHED_ITEM to the item that was matched
 define TRY_TO_MATCH_RULE_FROM_LIST
-    $$(eval $$(call COMPARE_AND_REMOVE_FROM_RULE,$$(firstword $1)))
+    ifneq ($1,)
-    ifeq ($$(RULE_FOUND),true)
+        $$(eval $$(call COMPARE_AND_REMOVE_FROM_RULE,$$(firstword $1)))
-        MATCHED_ITEM := $$(firstword $1)
+        ifeq ($$(RULE_FOUND),true)
-    else ifneq ($1,)
+            MATCHED_ITEM := $$(firstword $1)
-        $$(eval $$(call TRY_TO_MATCH_RULE_FROM_LIST,$$(wordlist 2,9999,$1)))
+        else 
+            $$(eval $$(call TRY_TO_MATCH_RULE_FROM_LIST,$$(wordlist 2,9999,$1)))
+        endif
     endif
 endef
 
@@ -96,10 +99,18 @@ define PARSE_ALL_KEYMAPS
     $$(eval $$(call PARSE_ALL_IN_LIST,PARSE_KEYMAP,$$(KEYMAPS)))
 endef
 
-# $1 = Keyboard
+define PARSE_ALL_SUBPROJECTS
-define PARSE_KEYBOARD
+    ifeq ($$(SUBPROJECTS),)
-    CURRENT_KB := $1
+        $$(eval $$(call PARSE_SUBPROJECT,))
-    KEYMAPS := $(notdir $(patsubst %/.,%,$(wildcard $(ROOT_DIR)/keyboards/$1/keymaps/*/.)))
+    else
+        $$(eval $$(call PARSE_ALL_IN_LIST,PARSE_SUBPROJECT,$$(SUBPROJECTS)))
+    endif
+endef
+
+# $1 Subproject
+define PARSE_SUBPROJECT
+    CURRENT_SP := $1
+    KEYMAPS := $$(notdir $$(patsubst %/.,%,$$(wildcard $(ROOT_DIR)/keyboards/$$(CURRENT_KB)/keymaps/*/.)))
     $$(eval $$(call COMPARE_AND_REMOVE_FROM_RULE,allkm))
     ifeq ($$(RULE_FOUND),true)
         $$(eval $$(call PARSE_ALL_KEYMAPS))
@@ -111,11 +122,27 @@ define PARSE_KEYBOARD
     endif
 endef
 
+# $1 = Keyboard
+define PARSE_KEYBOARD
+    CURRENT_KB := $1
+    # A subproject is any keyboard subfolder with a makefile
+    SUBPROJECTS := $$(notdir $$(patsubst %/Makefile,%,$$(wildcard $(ROOT_DIR)/keyboards/$$(CURRENT_KB)/*/Makefile)))
+    $$(eval $$(call COMPARE_AND_REMOVE_FROM_RULE,allsp))
+    ifeq ($$(RULE_FOUND),true)
+        $$(eval $$(call PARSE_ALL_SUBPROJECTS))
+    else
+        $$(eval $$(call TRY_TO_MATCH_RULE_FROM_LIST,$$(SUBPROJECTS)))
+        ifeq ($$(RULE_FOUND),true)
+            $$(eval $$(call PARSE_SUBPROJECT,$$(MATCHED_ITEM)))
+        endif
+    endif
+endef
+
 # $1 Keymap
 define PARSE_KEYMAP
     CURRENT_KM = $1
-    COMMANDS += KEYBOARD_$$(CURRENT_KB)_KEYMAP_$$(CURRENT_KM)
+    COMMANDS += KEYBOARD_$$(CURRENT_KB)_SUBPROJECT_$$(CURRENT_SP)_KEYMAP_$$(CURRENT_KM)
-    COMMAND_KEYBOARD_$$(CURRENT_KB)_KEYMAP_$$(CURRENT_KM) := Keyboard $$(CURRENT_KB), Keymap $$(CURRENT_KM)
+    COMMAND_KEYBOARD_$$(CURRENT_KB)_SUBPROJECT_$(CURRENT_SP)_KEYMAP_$$(CURRENT_KM) := Keyboard $$(CURRENT_KB), Subproject $$(CURRENT_SP), Keymap $$(CURRENT_KM)
 endef
 
 define PARSE_RULE