[output] add 'Logger.traceback()' helper

gallery_dl/downloader/http.py

@@ -95,7 +95,7 @@ class HttpDownloader(DownloaderBase):
         except Exception as exc:
             if self.downloading:
                 output.stderr_write("\n")
-            self.log.debug("", exc_info=exc)
+            self.log.traceback(exc)
             raise
         finally:
             # remove file from incomplete downloads

gallery_dl/downloader/ytdl.py

@@ -49,7 +49,7 @@ class YoutubeDLDownloader(DownloaderBase):
                 except (ImportError, SyntaxError) as exc:
                     self.log.error("Cannot import module '%s'",
                                    getattr(exc, "name", ""))
-                    self.log.debug("", exc_info=exc)
+                    self.log.traceback(exc)
                     self.download = lambda u, p: False
                     return False
 
@@ -91,7 +91,7 @@ class YoutubeDLDownloader(DownloaderBase):
                 else:
                     info_dict = self._extract_info(ytdl_instance, url)
             except Exception as exc:
-                self.log.debug("", exc_info=exc)
+                self.log.traceback(exc)
                 self.log.warning("%s: %s", exc.__class__.__name__, exc)
 
             if not info_dict:
@@ -164,7 +164,7 @@ class YoutubeDLDownloader(DownloaderBase):
         try:
             ytdl_instance.process_info(info_dict)
         except Exception as exc:
-            self.log.debug("", exc_info=exc)
+            self.log.traceback(exc)
             return False
 
         pathfmt.temppath = info_dict.get("filepath") or info_dict["_filename"]
@@ -188,7 +188,7 @@ class YoutubeDLDownloader(DownloaderBase):
                 ytdl_instance.process_info(entry)
                 status = True
             except Exception as exc:
-                self.log.debug("", exc_info=exc)
+                self.log.traceback(exc)
                 self.log.error("%s: %s", exc.__class__.__name__, exc)
         return status