initial code added

README.md

@@ -1,2 +1,9 @@
-# python_project
+# Relative Playlist Maker
 
+Recursively traverse a music folder containing tracks and playlist files that reference them, replacing absolute paths in the playlists with equivalent relative paths.
+
+## Usage
+
+```shell
+python relative-playlist-maker.py ~/Music
+```

pyproject.toml

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+[project]
+name = "relative-playlist-maker"
+version = "0.1.0"
+description = "Recursively traverse a music folder containing tracks and playlist files that reference them, replacing absolute paths in the playlists with equivalent relative paths."
+requires-python = ">=3.4"
+dependencies = []

relative-playlist-maker.py

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+from argparse import ArgumentParser
+from pathlib import Path
+from logging import basicConfig, warning, WARNING
+from shutil import copyfile
+
+def main(music_folder: Path):
+    music_folder = music_folder.resolve()
+
+    for m3u in music_folder.rglob("*.m3u"):
+        copyfile(m3u, m3u.with_suffix(".m3u.bak"))
+
+        with m3u.open("r") as contents:
+            tracks = [Path(p).resolve() for p in contents.readlines()]
+
+        if not all(music_folder in track.parents for track in tracks):
+            warning(f"{m3u} contains references to tracks that are not in {music_folder} and will be skipped")
+            continue
+       
+        with m3u.open("w") as updated_contents:
+            for track in tracks:
+                updated_contents.write(str(track.relative_to(m3u, walk_up=True)).replace("\\", "/"))
+
+
+if __name__ == "__main__":
+    basicConfig(
+        level=WARNING,
+    )
+    
+    parser = ArgumentParser(
+        description=""
+    )
+
+    parser.add_argument(
+        "music_folder",
+        required=True,
+        type=Path
+    )
+
+    args = parser.parse_args()
+
+    main(args.music_folder)

uv.lock

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+version = 1
+revision = 3
+requires-python = ">=3.4"
+
+[[package]]
+name = "relative-playlist-maker"
+version = "0.1.0"
+source = { virtual = "." }