Scripts: Rewrite build script in python

build.py

@@ -0,0 +1,97 @@
+#!/usr/bin/env python
+import os
+import shutil
+import subprocess as spc
+from pathlib import Path
+
+PWD = Path(".")
+BUILD_DIR = Path("build")
+
+IGNORE_DIRS = [
+    ".idea",
+    "build",
+    "venv",
+]
+
+# If a file extension is here and the key value is True, it will get processed.
+# If it is here and the key value is False, it will get copied.
+TO_PROCESS = {
+    "html": True,
+    "css": False,
+    "ico": False,
+    "js": False,
+    "png": False,
+    "svg": False,
+    "webmanifest": False,
+    "xml": False,
+}
+
+
+def ext_of(file: Path) -> str:
+    """Returns the extension of the given file."""
+    return file.name.split(".")[-1]
+
+
+def should_process(file: Path) -> bool:
+    """Returns whether if the file should be processed."""
+    return should_copy(file) and TO_PROCESS.get(ext_of(file), False)
+
+
+def should_copy(file: Path, /) -> bool:
+    """Returns whether if the file should be copied (i.e. included in the build/ dir)."""
+    return ext_of(file) in TO_PROCESS and not file.name.startswith("_")
+
+
+def process_file(in_: Path, out: Path, /) -> None:
+    """
+    Processes the give file with the C preprocessor.
+    Writes the output to the given file.
+    Filters lines that start with `#`.
+    """
+    process = spc.Popen(
+        f"cc -E - < {in_}", stderr=spc.DEVNULL, stdout=spc.PIPE, shell=True
+    )
+
+    with out.open("wb") as out_file:
+        for line in process.stdout:
+            if line.startswith(b"#"):
+                continue
+
+            out_file.write(line)
+
+
+def build(directory: Path, /) -> None:
+    for path in directory.iterdir():
+        if any(
+            part in IGNORE_DIRS
+            for part in (path.parts[:-1] if path.is_file() else path.parts)
+        ):
+            continue
+
+        if path.is_dir():
+            build(path)
+            continue
+
+        if not should_copy(path):
+            continue
+
+        path_build_path = BUILD_DIR / path.relative_to(PWD)
+        path_build_path.parent.mkdir(parents=True, exist_ok=True)
+
+        if should_process(path):
+            print("Building", end="")
+            process_file(path, path_build_path)
+        else:
+            print("Copying ", end="")
+            shutil.copyfile(path, path_build_path)
+
+        print(f" {path}...")
+
+
+if __name__ == "__main__":
+    shutil.rmtree("build", ignore_errors=True)
+    os.makedirs("build")
+
+    build(PWD)
+    print()
+    print("Building finished!")