fix: Make /topic behave the same way as on IRC

This refactors the topic command, and makes it behave the same way as it
does on IRC. The fixes include:

- `/topic` prints the topic instead of clearing it
- `/topic #channel` prints the topic for that channel in that channels
  buffer instead of setting the topic to #channel
- `/topic #channel [...]` for a channel that doesn't exist gives a
  proper error message

The patch also removes some unused code, refactors the logic and removes
the `/slack topic` command, since using `/topic` should suffice.

The reason it returs WEECHAT_RC_OK_EAT when the channel isn't found, is
so weechat doesn't print an error message such as:

    irc: command "topic" must be executed on irc buffer (server or channel)

Fixes #405

1 files changed, 32 insertions, 35 deletions

diff --git a/wee_slack.py b/wee_slack.py
index 90b56ac..37db0ec 100644
--- a/wee_slack.py
+++ b/wee_slack.py
@@ -2826,48 +2826,45 @@ def part_command_cb(data, current_buffer, args):
 
 
 @slack_buffer_or_ignore
-def topic_command_cb(data, current_buffer, args):
-    n = len(args.split())
-    if n < 2:
-        channel = channels.find(current_buffer)
-        if channel:
-            w.prnt(current_buffer, 'Topic for {} is "{}"'.format(channel.name, channel.topic))
-        return w.WEECHAT_RC_OK_EAT
-    elif command_topic(data, current_buffer, args.split(None, 1)[1]):
-        return w.WEECHAT_RC_OK_EAT
-    else:
-        return w.WEECHAT_RC_ERROR
-
-
-@slack_buffer_required
-def command_topic(data, current_buffer, args):
+def topic_command_cb(data, current_buffer, command):
     """
     Change the topic of a channel
-    /slack topic [<channel>] [<topic>|-delete]
+    /topic [<channel>] [<topic>|-delete]
     """
     data = decode_from_utf8(data)
-    args = decode_from_utf8(args)
-    e = EVENTROUTER
-    team = e.weechat_controller.buffers[current_buffer].team
-    # server = servers.find(current_domain_name())
-    args = args.split(' ')
-    if len(args) > 2 and args[1].startswith('#'):
-        cmap = team.get_channel_map()
-        channel_name = args[1][1:]
-        channel = team.channels[cmap[channel_name]]
-        topic = " ".join(args[2:])
+    command = decode_from_utf8(command)
+    team = EVENTROUTER.weechat_controller.buffers[current_buffer].team
+
+    args = command.split()[1:]
+    channel_name = None
+    topic = []
+    if args:
+        if args[0].startswith('#'):
+            channel_name = args[0][1:]
+            topic = args[1:]
+        else:
+            topic = args
+
+    if channel_name:
+        channel = team.channels.get(team.get_channel_map().get(channel_name))
     else:
-        channel = e.weechat_controller.buffers[current_buffer]
-        topic = " ".join(args[1:])
+        channel = EVENTROUTER.weechat_controller.buffers[current_buffer]
 
-    if channel:
-        if topic == "-delete":
-            topic = ''
-        s = SlackRequest(team.token, "channels.setTopic", {"channel": channel.identifier, "topic": topic}, team_hash=team.team_hash)
-        EVENTROUTER.receive(s)
+    if not channel:
+        w.prnt(team.channel_buffer, "#{}: No such channel".format(channel_name))
         return w.WEECHAT_RC_OK_EAT
+
+    if topic:
+        topic = ' '.join(topic)
+    if topic == '-delete':
+        topic = ''
+
+    if topic == []:
+        w.prnt(channel.channel_buffer, 'Topic for {} is "{}"'.format(channel.name, channel.slack_topic['value']))
     else:
-        return w.WEECHAT_RC_ERROR_EAT
+        s = SlackRequest(team.token, "channels.setTopic", {"channel": channel.identifier, "topic": topic}, team_hash=team.team_hash)
+        EVENTROUTER.receive(s)
+    return w.WEECHAT_RC_OK_EAT
 
 
 @slack_buffer_or_ignore
@@ -3267,7 +3264,7 @@ def setup_hooks():
     w.hook_command_run('/join', 'command_talk', '')
     w.hook_command_run('/part', 'part_command_cb', '')
     w.hook_command_run('/leave', 'part_command_cb', '')
-    w.hook_command_run('/topic', 'command_topic', '')
+    w.hook_command_run('/topic', 'topic_command_cb', '')
     w.hook_command_run('/thread', 'thread_command_callback', '')
     w.hook_command_run('/reply', 'thread_command_callback', '')
     w.hook_command_run('/rehistory', 'rehistory_command_callback', '')