Migrate makefile utilities to sub-directory (#14917)

builddefs/generic_features.mk

@@ -0,0 +1,49 @@
+# Copyright 2021 QMK
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+SPACE_CADET_ENABLE ?= yes
+GRAVE_ESC_ENABLE ?= yes
+
+GENERIC_FEATURES = \
+    COMBO \
+    COMMAND \
+    DIGITIZER \
+    DIP_SWITCH \
+    DYNAMIC_KEYMAP \
+    DYNAMIC_MACRO \
+    ENCODER \
+    GRAVE_ESC \
+    HAPTIC \
+    KEY_LOCK \
+    KEY_OVERRIDE \
+    LEADER \
+    PROGRAMMABLE_BUTTON \
+    SPACE_CADET \
+    TAP_DANCE \
+    VELOCIKEY \
+    WPM \
+
+define HANDLE_GENERIC_FEATURE
+    # $$(info "Processing: $1_ENABLE $2.c")
+    SRC += $$(wildcard $$(QUANTUM_DIR)/process_keycode/process_$2.c)
+    SRC += $$(wildcard $$(QUANTUM_DIR)/$2.c)
+    OPT_DEFS += -D$1_ENABLE
+endef
+
+$(foreach F,$(GENERIC_FEATURES),\
+    $(if $(filter yes, $(strip $($(F)_ENABLE))),\
+        $(eval $(call HANDLE_GENERIC_FEATURE,$(F),$(shell echo $(F) | tr '[:upper:]' '[:lower:]'))) \
+    ) \
+)