don't include generated math into build_file, use cache, ui

build_file.c

@@ -1,4 +1,5 @@
 // don't ever include stuff that build_file will generate code for!
+#define DONT_INCLUDE_GENERATED_MATH
 #include "src/core/core_inc.h"
 #include "src/core/core_inc.c"
 
@@ -22,13 +23,13 @@ void list_files_recursive(sb8_t *sb, s8_t path) {
 }
 
 int main(int argc, char **argv) {
+    cache_init(&Perm, s8_lit("cache_build_file"));
     int ok = 0;
 
     ma_arena_t *arena = ma_create(ma_default_reserve_size);
     meta_app(arena);
     meta_ui(arena);
 
-    b32 generate_math_library = false; // WARNING: be wary of this, cause it might break build file
     b32 execute_python_snippets = false; // make sure to not abuse just for quick maths
     b32 run_server = false;
 
@@ -36,7 +37,7 @@ int main(int argc, char **argv) {
     b32 win32_target = true;
     b32 wasm_target = false;
 
-    if (generate_math_library) {
+    if (cache_code_modified(s8_lit("../src/core/core_math_gen.py"), s8_null)) {
         os_set_working_dir("../src/core");
         os_systemf("py core_math_gen.py");
         os_set_working_dir("../../build");
@@ -110,5 +111,7 @@ int main(int argc, char **argv) {
         os_copy("main.wasm", "../package/main.wasm", os_copy_overwrite);
         if (ok != 0) return ok;
     }
+
+    cache_save();
     return ok;
 }