feed: truncate file name if too long

lumbunglib/feed.py

@@ -1,6 +1,7 @@
 import os
 import shutil
 import time
+from hashlib import md5
 from ast import literal_eval as make_tuple
 from pathlib import Path
 from urllib.parse import urlparse
@@ -238,6 +239,13 @@ def main():
                 entry["feed_name"] = feed_name
 
                 post_name = slugify(entry.title)
+                # pixelfed returns the whole post text as the post name. max
+                # filename length is 255 on many systems. here we're shortening
+                # the name and adding a hash to it to avoid a conflict in a
+                # situation where 2 posts start with exactly the same text.
+                if len(post_name) > 150:
+                    post_hash = md5(bytes(post_name, "utf-8"))
+                    post_name = post_name[:150] + "-" + post_hash.hexdigest()
                 post_dir = os.path.join(output_dir, feed_name, post_name)
 
                 if post_name not in existing_posts: