[feat] ensure cleanup of .last_model file between and after runs

TODO.md

@@ -1,26 +1,19 @@
 - [x] update the project to no more use features
-- update last_model to be only used during one run
+- [x] update last_model to be only used during one run
-
 - rename project to "PolyScribe"
-
+- add tests
 - update local models using hashes (--update-models)
 - create folder models/ if not present -> use /usr/share/polyscribe/models/ for release version, use ./models/ for development version
 - create missing folders for output files
-
 - for merging (command line flag) -> if not present, treat each file as separate output (--merge | -m)
 - for merge + separate output -> if present, treat each file as separate output and also output a merged version (--merge-and-separate)
 - set speaker-names per input-file -> prompt user for each file if flag is set (--set-speaker-names)
 - fix cli output for model display
 - refactor into proper cli app
-
 - add support for video files -> use ffmpeg to extract audio
-
 - detect gpus and use them
 - add error handling
-- add tests
-
 - add verbose flag (--verbose | -v) + add logging
-
 - add documentation
 - package into executable
 - add CI

src/main.rs

@@ -334,9 +334,26 @@ fn transcribe_native(audio_path: &Path, speaker: &str, lang_opt: Option<&str>) -
     Ok(items)
 }
 
+struct LastModelCleanup {
+    path: PathBuf,
+}
+impl Drop for LastModelCleanup {
+    fn drop(&mut self) {
+        let _ = std::fs::remove_file(&self.path);
+    }
+}
+
 fn main() -> Result<()> {
     let args = Args::parse();
 
+    // Remove stale last_model from previous runs and set up cleanup on exit
+    let models_dir = Path::new("models");
+    let last_model_path = models_dir.join(".last_model");
+    // Best-effort cleanup at start
+    let _ = std::fs::remove_file(&last_model_path);
+    // Ensure cleanup at end of program, regardless of exit path
+    let _last_model_cleanup = LastModelCleanup { path: last_model_path.clone() };
+
     // If requested, run the interactive model downloader first. If no inputs were provided, exit after downloading.
     if args.download_models {
         if let Err(e) = models::run_interactive_model_downloader() {