Track channel and user names

[benjie]

Channels

• Load channels bot is in on startup (channels, groups, im), store into a hash keyed by channel ID
• On channel_joined, add new channel information to hash
• On channel_renamed, update channel hash information
• On channel_left, remove channel from hash
• Add a function to get the channel name from the hash, falling back to the ID on failure

Channel IDs seem to be prefixed with a character:

• C - channel (public)
• G - group (private)
• D - im (DM)

Relevant:

• channels.list - list of all channels (filter on is_member)
• groups.list
• im.list
• message event
• channel type (public channel)
• group type (private channel)
• im type (DM)

Users

• Load list of users on startup, store into a hash keyed by user ID
• On team_join, add new user
• On user_change, update user
• Add a function to get the user name from the hash, falling back to the ID on failure

Relevant:

• users.list

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• Ensure that the above covers regular channels, private channels and DMs