Add Reddit link replacement support

Closes #306
Closes #353

nitter.conf

@@ -34,6 +34,7 @@ tokenCount = 10
 theme = "Nitter"
 replaceTwitter = "nitter.net"
 replaceYouTube = "piped.kavin.rocks"
+replaceReddit = "teddit.net"
 replaceInstagram = ""
 proxyVideos = true
 hlsPlayback = false

src/formatters.nim

@@ -4,8 +4,16 @@ import types, utils, query
 
 const
   ytRegex = re"([A-z.]+\.)?youtu(be\.com|\.be)"
-  twRegex = re"(?<![^\/> ])(?<![^\/]\/)(www\.|mobile\.)?twitter\.com"
   igRegex = re"(www\.)?instagram\.com"
+
+  rdRegex = re"(?<![.b])((www|np|new|amp|old)\.)?reddit.com"
+  rdShortRegex = re"(?<![.b])redd\.it\/"
+  # Videos cannot be supported uniformly between Teddit and Libreddit,
+  # so v.redd.it links will not be replaced.
+  # Images aren't supported due to errors from Teddit when the image
+  # wasn't first displayed via a post on the Teddit instance.
+
+  twRegex = re"(?<![^\/> ])(?<![^\/]\/)(www\.|mobile\.)?twitter\.com"
   cards = "cards.twitter.com/cards"
   tco = "https://t.co"
 
@@ -53,6 +61,12 @@ proc replaceUrl*(url: string; prefs: Prefs; absolute=""): string =
     result = result.replace(cards, prefs.replaceTwitter & "/cards")
     result = result.replace(twRegex, prefs.replaceTwitter)
 
+  if prefs.replaceReddit.len > 0 and (rdRegex in result or "redd.it" in result):
+    result = result.replace(rdShortRegex, prefs.replaceReddit & "/comments/")
+    result = result.replace(rdRegex, prefs.replaceReddit)
+    if prefs.replaceReddit in result and "/gallery/" in result:
+      result = result.replace("/gallery/", "/comments/")
+
   if prefs.replaceInstagram.len > 0 and igRegex in result:
     result = result.replace(igRegex, prefs.replaceInstagram)
 

src/prefs_impl.nim

@@ -58,6 +58,10 @@ genPrefs:
       "Replace YouTube links with Piped/Invidious (blank to disable)"
       placeholder: "Piped hostname"
 
+    replaceReddit(input, "teddit.net"):
+      "Replace Reddit links with Teddit/Libreddit (blank to disable)"
+      placeholder: "Teddit hostname"
+
     replaceInstagram(input, ""):
       "Replace Instagram links with Bibliogram (blank to disable)"
       placeholder: "Bibliogram hostname"

tests/test_tweet.py

@@ -42,7 +42,7 @@ link = [
     ['nim_lang/status/1110499584852353024', [
         'nim-lang.org/araq/ownedrefs.…',
         'news.ycombinator.com/item?id…',
-        'old.reddit.com/r/programming…'
+        'teddit.net/r/programming…'
     ]],
     ['nim_lang/status/1125887775151140864', [
         'en.wikipedia.org/wiki/Nim_(p…'