Add `sounds.h`, C array versions of sound files

This enables us to compile the sound files into our binary.

Makefile:
Add a target to build the `sounds.h` file, by running `xxd -i` on both
sound files.

Thanks to Matteo Italia
(https://stackoverflow.com/users/214671/matteo-italia) on Stack Overflow
for describing how to use `xxd -i` to create a C array from a binary
file:
https://stackoverflow.com/questions/8707183/script-tool-to-convert-file-to-c-c-source-code-array/8707241#8707241

An to John Marshall
(https://stackoverflow.com/users/280577/john-marshall) on Stack Overflow
for showing me the Make `foreach` function:
https://stackoverflow.com/questions/7918511/make-execute-an-action-for-each-prerequisite/7921168#7921168

1 files changed, 9 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index cc62af2..0955ce3 100644
--- a/Makefile
+++ b/Makefile
@@ -28,3 +28,12 @@ clean:
 .PHONY: run
 run: build
 	$(DEBUG_PRODUCT) --daemon
+
+DomeKey/sounds.h: sounds/*.mp3
+	: > $@
+	echo '#ifndef SOUNDS_H' >> $@
+	echo '#define SOUNDS_H' >> $@
+	echo >> $@
+	$(foreach f,$^,xxd -include  $(f) >> $@;)
+	echo >> $@
+	echo '#endif /* SOUNDS_H */' >> $@