Switch the default use_log value to true

Since this is a privacy sensitive action, a short message is now
displayed on first run.

data/default_config.cfg

@@ -251,7 +251,7 @@ use_bookmarks_method =
 
 # set to 'true' if you want to save logs of all the messages
 # in files.
-#use_log = false
+#use_log = true
 
 # The number of lines to preload in a chat buffer when it opens
 # (the lines are preloaded from the log files)

doc/source/configuration.rst

@@ -907,10 +907,9 @@ Options related to logging.
 
     use_log
 
-        **Default value:** ``false``
+        **Default value:** ``true``
 
-        Set to ``true`` if you want to save logs of all the messages
-        in files.
+        Set to ``false`` if you don’t want to write any message to the disk.
 
 Plugins
 ~~~~~~~

poezio/config.py

@@ -137,7 +137,7 @@ DEFAULT_CONFIG = {
         'themes_dir': '',
         'tmp_image_dir': '',
         'use_bookmarks_method': '',
-        'use_log': False,
+        'use_log': True,
         'use_remote_bookmarks': True,
         'user_list_sort': 'desc',
         'use_tab_nicks': True,

poezio/core/core.py

@@ -526,10 +526,13 @@ class Core:
         if firstrun:
             self.information(
                 'It seems that it is the first time you start poezio.\n'
-                'The online help is here http://doc.poez.io/\n'
+                'The online help is here https://doc.poez.io/\n\n'
                 'No room is joined by default, but you can join poezio’s'
-                ' room (with /join poezio@muc.poez.io), where you can'
-                ' ask for help or tell us how great it is.', 'Help')
+                ' room (with \x19b/join poezio@muc.poez.io\x19o), where you can'
+                ' ask for help or tell us how great it is.\n\n'
+                'Note that all of your discussions are currently logged'
+                ' to the disk, you can prevent that with'
+                ' \x19b/set use_log false\x19o', 'Help')
         self.refresh_window()
         self.xmpp.plugin['xep_0012'].begin_idle(jid=self.xmpp.boundjid)