diff --git a/bytebeat_compiler.py b/bytebeat_compiler.py
index 277067c..9045ef3 100644
--- a/bytebeat_compiler.py
+++ b/bytebeat_compiler.py
@@ -4,7 +4,7 @@ if __name__ == "__main__":
 	print(":: C bytebeat generator: compiler unit")
 
 from argparse import ArgumentParser
-from os import environ, makedirs, name as os_name, rename
+from os import environ, makedirs, name as os_name
 from os.path import exists, join as path_join
 from shlex import join as command_line_join, split as command_line_split
 from shutil import which
@@ -91,6 +91,24 @@ def run_command(*command: list[str]) -> None:
 	if subprocess.run(command).returncode != EXIT_SUCCESS:
 		raise SystemExit(EXIT_FAILURE)
 
+def compile_substituted_file(input_file: str, output_file: str) -> None:
+	print("Compiling")
+
+	run_command(
+		CC,
+		*command_line_split(CFLAGS),
+		input_file,
+		PATHS["fwrite_le"],
+		"-o", output_file,
+		"-I" + PATHS["include_directory"]
+	)
+	run_command(output_file)
+
+def main_workflow(input_file: str, output_file: str, \
+                  substitute_contents: Dict[str, str]) -> None:
+	rewrite_file(input_file, substitute_contents)
+	compile_substituted_file(input_file, output_file)
+
 preprocessor_bool = lambda value: "1" if value else "0"
 C_str_repr = lambda s: '"' + s.replace("\\", "\\\\").replace(r'"', r'\"') + '"'
 
@@ -251,52 +269,42 @@ if __name__ == "__main__":
 			                 "specify it by setting\nan environmental variable "
 			                 "CC.")
 
-	with TemporaryDirectory() as tmpdirname:
-		temporary_path = lambda path: path_join(tmpdirname, path)
+	substitute_contents = substitute_vars({
+		"bytebeat_contents": bytebeat_contents,
+		"output_file": C_str_repr(args.output),
+		"sample_rate": \
+			value if (value := args.final_sample_rate) else args.sample_rate,
+		"original_sample_rate": original_sample_rate,
+		"final_sample_rate_code": final_sample_rate_code,
+		"bit_depth": args.bit_depth,
+		"is_signed": args.signed,
+		"precalculated_ratio": args.precalculate_ratio,
+		"faster_sample_ratio_math": args.precalculate_ratio,
+		"fp_return_type": args.floating_point,
+		"channels": args.channels,
+		"length": samples,
+		"wav_product": gen_length * (args.bit_depth // BITS_PER_BYTE),
+		"gen_length": gen_length,
+		"sequential_mode": args.mode == "sequential",
+		"block_size": args.block_size,
+		"silent_mode": args.silent,
+		"verbose_mode": args.verbose and not args.silent,
+		"fwrite_le": PATHS["fwrite_le_header"],
+		"ansi_escape_codes_supported": ansi_escape_codes_supported
+	}, read_file(PATHS["template"]), args.show_substituted_values)
 
-		substitute_temp = temporary_path(PATHS["substitute"])
-		rewrite_file(substitute_temp, substitute_vars({
-			"bytebeat_contents": bytebeat_contents,
-			"output_file": C_str_repr(args.output),
-			"sample_rate": \
-				value if (value := args.final_sample_rate) else \
-				args.sample_rate,
-			"original_sample_rate": original_sample_rate,
-			"final_sample_rate_code": final_sample_rate_code,
-			"bit_depth": args.bit_depth,
-			"is_signed": args.signed,
-			"precalculated_ratio": args.precalculate_ratio,
-			"faster_sample_ratio_math": args.precalculate_ratio,
-			"fp_return_type": args.floating_point,
-			"channels": args.channels,
-			"length": samples,
-			"wav_product": gen_length * (args.bit_depth // BITS_PER_BYTE),
-			"gen_length": gen_length,
-			"sequential_mode": args.mode == "sequential",
-			"block_size": args.block_size,
-			"silent_mode": args.silent,
-			"verbose_mode": args.verbose and not args.silent,
-			"fwrite_le": PATHS["fwrite_le_header"],
-			"ansi_escape_codes_supported": ansi_escape_codes_supported
-		}, read_file(PATHS["template"]), args.show_substituted_values))
+	if args.keep_files:
+		makedirs(PATHS["bin_dir"], exist_ok=True)
 
-		# Compile
-		print("Compiling")
+		substitute_file = PATHS["substitute_kept"]
+		output_file = PATHS["output_kept"]
 
-		output_file_temp = temporary_path(PATHS["output"])
+		main_workflow(substitute_file, output_file, substitute_contents)
+	else:
+		with TemporaryDirectory() as tmpdirname:
+			temporary_path = lambda path: path_join(tmpdirname, path)
 
-		run_command(
-			CC,
-			*command_line_split(CFLAGS),
-			substitute_temp,
-			PATHS["fwrite_le"],
-			"-o", output_file_temp,
-			"-I" + PATHS["include_directory"]
-		)
-		run_command(output_file_temp)
+			substitute_temp = temporary_path(PATHS["substitute"])
+			output_temp = temporary_path(PATHS["output"])
 
-		if args.keep_files:
-			makedirs(PATHS["bin_dir"], exist_ok=True)
-
-			rename(substitute_temp, PATHS["substitute_kept"])
-			rename(output_file_temp, PATHS["output_kept"])
+			main_workflow(substitute_temp, output_temp, substitute_contents)