fontgen: generate font .c files in build dir

src/displayapp/fonts/CMakeLists.txt

@@ -4,13 +4,16 @@ set(FONTS jetbrains_mono_42 jetbrains_mono_76 jetbrains_mono_bold_20
    jetbrains_mono_extrabold_compressed lv_font_navi_80 lv_font_sys_48
    open_sans_light)
 
+configure_file(displayapp/fonts/jetbrains_mono_bold_20.c_zero.patch
+   displayapp/fonts/jetbrains_mono_bold_20.c_zero.patch COPYONLY)
 foreach(FONT ${FONTS})
-   set_source_files_properties(${CMAKE_CURRENT_SOURCE_DIR}/displayapp/fonts/${FONT}.c 
+   set_source_files_properties(displayapp/fonts/${FONT}.c
       PROPERTIES GENERATED TRUE)
 
-   add_custom_command(OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/displayapp/fonts/${FONT}.c
-      COMMAND python generate.py -f ${FONT} fonts.json
+   add_custom_command(OUTPUT displayapp/fonts/${FONT}.c
+      COMMAND python ${CMAKE_CURRENT_SOURCE_DIR}/displayapp/fonts/generate.py
+      -f ${FONT} ${CMAKE_CURRENT_SOURCE_DIR}/displayapp/fonts/fonts.json
       DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/displayapp/fonts/fonts.json
-      WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/displayapp/fonts
+      WORKING_DIRECTORY displayapp/fonts
       )
 endforeach()

src/displayapp/fonts/generate.py

@@ -11,6 +11,8 @@
 class Source(object):
     def __init__(self, d):
         self.file = d['file']
+        if not os.path.exists(self.file):
+            self.file = os.path.join(os.path.dirname(sys.argv[0]), self.file)
         self.range = d.get('range')
         self.symbols = d.get('symbols')