b/c...py: compile into a temporary directory

Generate intermediate files into a temporary directory

bytebeat_compiler.py

@@ -4,12 +4,12 @@ if __name__ == "__main__":
 	print(":: C bytebeat generator: compiler unit")
 
 from argparse import ArgumentParser
-from os import environ, listdir, makedirs, name as os_name, \
+from os import environ, makedirs, name as os_name, rename
-               remove as delete_file, rmdir
+from os.path import basename, exists, join as path_join
-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
 from sys import stdin, stdout
+from tempfile import TemporaryDirectory
 from typing import Dict, Union
 import subprocess
 
@@ -32,8 +32,8 @@ PATHS = {
 
 # Resolve paths
 PATHS["template"] = path_join(PATHS["src_dir"], PATHS["template"])
-PATHS["substitute"] = path_join(PATHS["bin_dir"], PATHS["substitute"])
+PATHS["substitute_kept"] = path_join(PATHS["bin_dir"], PATHS["substitute"])
-PATHS["output"] = path_join(PATHS["bin_dir"], PATHS["output"])
+PATHS["output_kept"] = path_join(PATHS["bin_dir"], PATHS["output"])
 PATHS["fwrite_le"] = path_join(PATHS["src_dir"], PATHS["fwrite_le"])
 
 # Add `.` directory before all paths for compilation
@@ -47,8 +47,8 @@ DEFAULT_PARAMETERS = {
 	"CFLAGS": "-Ofast -march=native -mtune=native -Wall -Wextra -Wpedantic "
 	          "-pedantic -Wno-unused-variable -Wno-unused-but-set-variable "
 	          "-Wno-dangling-else -Wno-parentheses -std=c99",
-	"INPUT_FILE": PATHS["substitute"],
+	"INPUT_FILE": PATHS["substitute_kept"],
-	"OUTPUT_FILE": PATHS["output"]
+	"OUTPUT_FILE": PATHS["output_kept"]
 }
 
 stdout_atty = hasattr(stdout, "isatty") and stdout.isatty()
@@ -94,10 +94,6 @@ def run_command(*command: list[str]) -> None:
 	if subprocess.run(command).returncode != EXIT_SUCCESS:
 		raise SystemExit(EXIT_FAILURE)
 
-def delete_empty_dir(path: str) -> None:
-	if exists(path) and len(listdir(path)) == 0:
-		rmdir(path)
-
 preprocessor_bool = lambda value: "1" if value else "0"
 C_str_repr = lambda s: '"' + s.replace("\\", "\\\\").replace(r'"', r'\"') + '"'
 
@@ -187,8 +183,6 @@ if __name__ == "__main__":
 		raise SystemExit("Empty file or STDIN")
 
 	# - Compilation
-	makedirs(PATHS["bin_dir"], exist_ok=True)
-
 	if not args.no_return:  # Insert `return` statement
 		# XXX: The bytebeat code is enclosed in parentheses to allow for the
 		# use of commas as a comma operator, enabling more formulas to function.
@@ -243,30 +237,6 @@ if __name__ == "__main__":
 	ansi_escape_codes_supported = args.color == "auto" and stdout_atty or \
 	                              args.color == "always"
 
-	rewrite_file(PATHS["substitute"], 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 is_cmd_unavailable(CC):
 		print(f"Compiler {CC} is not available, searching:")
 
@@ -286,20 +256,52 @@ if __name__ == "__main__":
 			                 "specify it by setting\nan environmental variable "
 			                 "CC.")
 
+	with TemporaryDirectory() as tmpdirname:
+		temporary_path = lambda path: path_join(tmpdirname, basename(path))
+
+		substitute_temp = temporary_path(INPUT_FILE)
+		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))
+
 		# Compile
 		print("Compiling")
 
+		output_file_temp = temporary_path(OUTPUT_FILE)
+
 		run_command(
 			CC,
 			*command_line_split(CFLAGS),
-		INPUT_FILE,
+			substitute_temp,
 			PATHS["fwrite_le"],
-		"-o", OUTPUT_FILE,
+			"-o", output_file_temp,
 			"-I" + PATHS["include_directory"]
 		)
-	run_command(OUTPUT_FILE)
+		run_command(output_file_temp)
 
-	if not args.keep_files:
+		if args.keep_files:
-		delete_file(PATHS["substitute"])
+			makedirs(PATHS["bin_dir"], exist_ok=True)
-		delete_file(OUTPUT_FILE)
+
-		delete_empty_dir(PATHS["bin_dir"])
+			rename(substitute_temp, INPUT_FILE)
+			rename(output_file_temp, OUTPUT_FILE)