v0.11.1: a web mix stops shipping an .m3u

It was there on the theory that it cost nothing and let the folder double as a
plain music folder. But a web mix is a folder you upload, and a stray playlist
file next to index.html is one more thing to explain to whoever receives it.

plan.m3u_name is now "" for WEB, so the plan doesn't name a file it won't
write, and index.html is simply the last thing written — which is what the
manifest-last invariant always meant for that branch. Folder exports keep
their m3u unchanged.

Claude-Session: https://claude.ai/code/session_01JBSM2bFC6UToiEg8BE4dqj

lintunes/__init__.py

@@ -1,3 +1,3 @@
 """LinTunes — iTunes-style music library manager and player for Linux."""
 
-__version__ = "0.11.0"
+__version__ = "0.11.1"

lintunes/export/exporter.py

@@ -11,8 +11,9 @@ Two invariants worth keeping:
 * **Local music files are only ever read.** Like sync, this never moves,
   rewrites or deletes anything in the library.
 * **The manifest is written last** — ``index.html`` for a web mix, the
-  ``.m3u`` for a folder. An interrupted export therefore never leaves behind
-  a playlist promising files that aren't there.
+  ``.m3u`` for a folder (a web mix gets no m3u: it is a page to upload, not a
+  music folder to open in a player). An interrupted export therefore never
+  leaves behind a page or playlist promising files that aren't there.
 """
 
 import html
@@ -103,7 +104,7 @@ class ExportPlan:
     playlist_name: str
     dest_dir: Path            # the folder that gets created
     audio_dir: Path           # dest_dir, or dest_dir/"audios" for a web mix
-    m3u_name: str
+    m3u_name: str             # "" for a web mix, which writes no m3u
     title: str = ""
     description: str = ""
     image: Path | None = None       # None = ship the gray placeholder
@@ -135,7 +136,7 @@ def plan_export(playlist_name: str, tracks: list, dest_parent: Path,
         playlist_name=playlist_name,
         dest_dir=dest_dir,
         audio_dir=dest_dir / "audios" if kind == WEB else dest_dir,
-        m3u_name=folder + ".m3u",
+        m3u_name="" if kind == WEB else folder + ".m3u",
         title=playlist_name,
         description=DEFAULT_DESCRIPTION,
     )
@@ -369,14 +370,18 @@ class ExportWorker(QObject):
             self.failed.emit(f"Export failed: {e}")
 
     def _write_manifest(self, completed: list):
-        """The .m3u, plus the page and its assets for a web mix. Written last."""
+        """The page for a web mix, the .m3u for a folder. Written last.
+
+        A web mix gets no m3u. It used to ship one on the theory that it cost
+        nothing and let the folder double as a plain music folder — but the
+        folder is a page you upload, and a stray playlist file next to
+        index.html is one more thing to explain to whoever receives it.
+        """
         plan = self._plan
-        entries = [(item.dest_name, item.secs, item.display) for item in completed]
 
         if plan.kind == WEB:
             for name in _WEB_ASSETS:
                 shutil.copyfile(templates() / name, plan.dest_dir / name)
-            image_name = None
             if plan.image is not None and Path(plan.image).is_file():
                 image_name = sanitize_name(Path(plan.image).stem) \
                     + Path(plan.image).suffix.lower()
@@ -385,11 +390,11 @@ class ExportWorker(QObject):
                 image_name = "placeholder.png"
                 shutil.copyfile(templates() / "placeholder.png",
                                 plan.dest_dir / image_name)
-            # An m3u alongside the page costs nothing and lets the folder
-            # double as a plain music folder.
-            entries = [("audios/" + n, s, d) for n, s, d in entries]
             (plan.dest_dir / "index.html").write_text(
                 build_index_html(plan, image_name), encoding="utf-8")
+            return
 
+        entries = [(item.dest_name, item.secs, item.display)
+                   for item in completed]
         (plan.dest_dir / plan.m3u_name).write_text(
             build_m3u(entries), encoding="utf-8")