delete tmp file if error happens

src/dl.rs

@@ -1,3 +1,4 @@
+use std::fs;
 use std::path::Path;
 
 use self::spawn::SpawnError;
@@ -33,6 +34,19 @@ fn make_download_path(info: &YtDlpInfo, format: &YtDlpFormat) -> Result<String,
         .map_err(|e| DownloadError::MakePathError)
 }
 
+fn file_exists(path: &str) -> bool {
+    match fs::metadata(path) {
+        Ok(_) => true,
+        Err(_) => false
+    }
+}
+
+pub fn delete_if_exists(path: &str) {
+    if file_exists(path) {
+        fs::remove_file(path);
+    }
+}
+
 pub async fn download(url: &str) -> Result<String, DownloadError> {
     let info = YtDlp::load_info(url).await?;
     let av = match info.best_av_format() {
@@ -41,7 +55,10 @@ pub async fn download(url: &str) -> Result<String, DownloadError> {
     };
     
     let output_path = make_download_path(&info, &av)?;
-    YtDlp::download(url, &av.format_id, output_path.as_str()).await?;
+    if let Err(e) = YtDlp::download(url, &av.format_id, output_path.as_str()).await {
+        delete_if_exists(&output_path);
+        return Err(DownloadError::Message(e.to_string()));
+    }
 
     Ok(output_path)
 }