Introduce small helper function for sys.exit

This saves us from specifying the program name every single time we want
the program to exit with an error message.

1 files changed, 7 insertions, 3 deletions

diff --git a/later b/later
index 61d8abe..5b82a6e 100755
--- a/later
+++ b/later
@@ -21,6 +21,10 @@ class YTDLPLogger:
         print("later: yt-dlp:", msg, file=sys.stderr)
 
 
+def exit(message=""):
+    sys.exit(f"later: {message}" if message else 0)
+
+
 def get_xdg(type, fallback):
     env = f"XDG_{type.upper()}_HOME"
     if env in os.environ:
@@ -75,7 +79,7 @@ class TitleMap:
             # Clobber the title cache if it was corrupted
             self.commit_to_disk = True
         except Exception as err:
-            sys.exit(f"later: cannot read title cache: {err}")
+            exit(f"cannot read title cache: {err}")
 
     def mark_seen(self, key):
         self.seen.add(key)
@@ -96,7 +100,7 @@ class TitleMap:
             # necessary: importing yt_dlp is noticeably slow :(
             import yt_dlp
         except ModuleNotFoundError:
-            sys.exit("later: yt-dlp was requested, but yt_dlp python module not found")
+            exit("yt-dlp was requested, but yt_dlp python module not found")
 
         if not self.ytdl:
             self.ytdl = yt_dlp.YoutubeDL({"logger": YTDLPLogger()})
@@ -131,7 +135,7 @@ class TitleMap:
             with open(self.path, "w") as handle:
                 json.dump(seen_entries, handle)
         except OSError as err:
-            sys.exit(f"later: cannot write title cache: {err}")
+            exit(f"cannot write title cache: {err}")
 
 
 def entries(title_map):