implement channel linking in migrated messages

src/core/discord_reader.py

@@ -62,6 +62,7 @@ class DiscordReader:
         self.guild: discord.Guild | None = None
         self.client: discord.Client | None = None
         self.role_map: Dict[int, str] = {}
+        self.channel_name_map: Dict[int, str] = {}
 
     def _create_client(self):
         intents = discord.Intents.default()
@@ -98,6 +99,18 @@ class DiscordReader:
             logger.error(f"Failed to fetch roles: {e}")
             self.role_map = {}
 
+        # Pre-fetch channels via API
+        try:
+            channels = await self.guild.fetch_channels()
+            self.channel_name_map = {c.id: c.name for c in channels}
+            logger.debug(f"Pre-fetched {len(self.channel_name_map)} channels")
+        except discord.Forbidden:
+            logger.warning("403 Forbidden: Missing Access to fetch channels. Continuing without channel name mapping.")
+            self.channel_name_map = {}
+        except Exception as e:
+            logger.error(f"Failed to fetch channels: {e}")
+            self.channel_name_map = {}
+
     async def validate(self) -> Dict[str, Any]:
         """Validates the token, server ID, intents, and permissions."""
         results = {

src/fluxer/migrate_message.py

@@ -7,7 +7,7 @@ from src.core.base import MigrationContext
 
 logger = logging.getLogger(__name__)
 
-def clean_mentions(content: str, guild, user_mentions=None, role_mentions=None, role_map=None, emoji_map=None) -> str:
+def clean_mentions(content: str, guild, user_mentions=None, role_mentions=None, role_map=None, emoji_map=None, channel_map=None, discord_channel_map=None) -> str:
     if not content or not guild:
         return content
         
@@ -54,8 +54,19 @@ def clean_mentions(content: str, guild, user_mentions=None, role_mentions=None,
         
     def replace_channel(match):
         cid = int(match.group(1))
+        
+        # 1. Check if channel is mapped in state
+        if channel_map and str(cid) in channel_map:
+            return f"<#{channel_map[str(cid)]}>"
+            
+        # 2. Fallback to name in backticks
+        # Try metadata map first (robust)
+        if discord_channel_map and cid in discord_channel_map:
+            return f"`#{discord_channel_map[cid]}`"
+            
+        # Try cache
         channel = guild.get_channel(cid)
-        return f"#{channel.name}" if channel else match.group(0)
+        return f"`{channel.name}`" if channel else f"<#{cid}>"
 
     def replace_emoji(match):
         animated = match.group(1) == "a"
@@ -180,7 +191,9 @@ async def migrate_messages(
                     msg.mentions, 
                     msg.role_mentions, 
                     context.discord_reader.role_map,
-                    context.state.emoji_map
+                    context.state.emoji_map,
+                    context.state.channel_map,
+                    context.discord_reader.channel_name_map
                 )
                 
             # Process attachments
@@ -209,7 +222,9 @@ async def migrate_messages(
                                 snapshot.mentions if hasattr(snapshot, 'mentions') else None,
                                 snapshot.role_mentions if hasattr(snapshot, 'role_mentions') else None,
                                 context.discord_reader.role_map,
-                                context.state.emoji_map
+                                context.state.emoji_map,
+                                context.state.channel_map,
+                                context.discord_reader.channel_name_map
                             )
                     # Add snapshot attachments to the list to process
                     attachments_to_process.extend(snapshot.attachments)

src/stoat/migrate_message.py

@@ -7,7 +7,7 @@ from src.core.base import MigrationContext
 
 logger = logging.getLogger(__name__)
 
-def clean_mentions(content: str, guild, user_mentions=None, role_mentions=None, role_map=None, emoji_map=None) -> str:
+def clean_mentions(content: str, guild, user_mentions=None, role_mentions=None, role_map=None, emoji_map=None, channel_map=None, discord_channel_map=None) -> str:
     if not content or not guild:
         return content
         
@@ -54,8 +54,19 @@ def clean_mentions(content: str, guild, user_mentions=None, role_mentions=None,
         
     def replace_channel(match):
         cid = int(match.group(1))
+        
+        # 1. Check if channel is mapped in state
+        if channel_map and str(cid) in channel_map:
+            return f"<#{channel_map[str(cid)]}>"
+            
+        # 2. Fallback to name in backticks
+        # Try metadata map first (robust)
+        if discord_channel_map and cid in discord_channel_map:
+            return f"`#{discord_channel_map[cid]}`"
+            
+        # Try cache
         channel = guild.get_channel(cid)
-        return f"#{channel.name}" if channel else match.group(0)
+        return f"`{channel.name}`" if channel else f"<#{cid}>"
 
     def replace_emoji(match):
         animated = match.group(1) == "a"
@@ -188,7 +199,9 @@ async def migrate_messages(
                     msg.mentions, 
                     msg.role_mentions, 
                     context.discord_reader.role_map,
-                    context.state.emoji_map
+                    context.state.emoji_map,
+                    context.state.channel_map,
+                    context.discord_reader.channel_name_map
                 )
                 
             # Process attachments
@@ -213,7 +226,9 @@ async def migrate_messages(
                                 snapshot.mentions if hasattr(snapshot, 'mentions') else None,
                                 snapshot.role_mentions if hasattr(snapshot, 'role_mentions') else None,
                                 context.discord_reader.role_map,
-                                context.state.emoji_map
+                                context.state.emoji_map,
+                                context.state.channel_map,
+                                context.discord_reader.channel_name_map
                             )
                     attachments_to_process.extend(snapshot.attachments)
                     logger.debug(f"Found forwarded snapshot content: {content[:50]}... and {len(snapshot.attachments)} attachments")