Adapt to the upcoming way for WeeChat store configuration.

In version of 3.2 of WeeChat, the default way of storing the
configuration and data, will be the XDG one. Let's adopt to this. Map
file will be stored on different location depending of the version of
weechat, but also, if mapping file would be spotted on one of the
defined locations, it would be used. Whatever version of the weechat you
have preferences are:

$XDG_DATA_HOME/weechat/replacement_map.json
$XDG_CONFIG_HOME/weechat/replacement_map.json
~/.weechat/weechat/replacement_map.json

whatever $XDG_somethinig is pointed to, or where
weechat_config_dir/weechat_data_dir are pointing. Those values are
retrieved from WeeChat, so you should know, where the replacement_map
should go.

replacer.py

@@ -27,7 +27,7 @@ import weechat
 
 NAME = 'replacer'
 AUTHOR = 'Roman Dobosz <gryf73@gmail.com>'
-VERSION = '1.2'
+VERSION = '1.3'
 LICENSE = 'Apache 2'
 DESC = 'Word replacer for WeeChat'
 COMMAND = 'replacer'
@@ -61,13 +61,32 @@ class Replacer(object):
     # one, so it also could be global, but globals are bad, mkay?
     self_object = None
 
-    def __init__(self, path=None):
+    def __init__(self):
         """Initialize plugin"""
         self.replacement_map = {}
-        self._path = path
+        self._path = None
+
+        map_file = "replacement_map.json"
+        data_dirs = (weechat.info_get("weechat_data_dir", ""),
+                     weechat.info_get("weechat_config_dir", ""),
+                     weechat.string_eval_path_home("%h", {}, {}, {}))
+
+        for path in data_dirs:
+            if os.path.exists(os.path.join(path, map_file)):
+                self._path = os.path.join(path, map_file)
+                break
+
+        version = weechat.info_get("version_number", "") or 0
+
+        # nothing found. so there is no replacement file. let's assume the
+        # right file path.
         if not path:
-            path = '%h/replacement_map.json'
-            self._path = weechat.string_eval_path_home(path, {}, {}, {})
+            if version < 0x3020000:  # < 3.2.0
+                path = '%h/' + map_file
+                self.path = weechat.string_eval_path_home(path, {}, {}, {})
+            else:
+                self.path = os.path.join(weechat.info_get("weechat_data_dir",
+                                                          ""), map_file)
         self._get_replacement_map()
 
     def _get_replacement_map(self):