Makefile: Add QMK_VERSION & co to OPT_DEFS (#408)

This adds the keyboard and keymap built, along with the QMK firmware's
git hash (or a timestamp), to OPT_DEFS. That, in turn, allows keymaps to
make use of these information, and do whatever they want with it. For
example, one could print them on `LEADER v` like this:

```c
SEQ_ONE_KEY (KC_V) {
  SEND_STRING (QMK_KEYBOARD "/" QMK_KEYMAP " @ " QMK_VERSION);
}
```

This addresses #366.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

diff --git a/Makefile b/Makefile
index f8c945045c3e574ae3bdc3af381d6f44d9212c3f..e93528600da4aa4b4a0e96431742f8f30518fe69 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -112,4 +112,9 @@ VPATH += $(QUANTUM_PATH)/audio
 
 include $(TMK_PATH)/protocol/lufa.mk
 include $(TMK_PATH)/common.mk
-include $(TMK_PATH)/rules.mk
\ No newline at end of file
+include $(TMK_PATH)/rules.mk
+
+GIT_VERSION := $(shell git describe --abbrev=6 --dirty --always --tags 2>/dev/null || date +"%Y-%m-%d")
+
+OPT_DEFS += -DQMK_KEYBOARD=\"$(KEYBOARD)\" -DQMK_KEYMAP=\"$(KEYMAP)\"
+OPT_DEFS += -DQMK_VERSION=\"$(GIT_VERSION)\"