Introduce /reload command

This command reloads the configuration file.

Fix https://github.com/profanity-im/profanity/issues/627

src/config/preferences.c

@@ -78,25 +78,9 @@ static const char* _get_key(preference_t pref);
 static gboolean _get_default_boolean(preference_t pref);
 static char* _get_default_string(preference_t pref);
 
-void
-prefs_load(char *config_file)
+void _prefs_load(void)
 {
-    GError *err;
-
-    if (config_file == NULL) {
-        prefs_loc = files_get_config_path(FILE_PROFRC);
-    } else {
-        prefs_loc = config_file;
-    }
-
-    if (g_file_test(prefs_loc, G_FILE_TEST_EXISTS)) {
-        g_chmod(prefs_loc, S_IRUSR | S_IWUSR);
-    }
-
-    prefs = g_key_file_new();
-    g_key_file_load_from_file(prefs, prefs_loc, G_KEY_FILE_KEEP_COMMENTS, NULL);
-
-    err = NULL;
+    GError *err = NULL;
     log_maxsize = g_key_file_get_integer(prefs, PREF_GROUP_LOGGING, "maxsize", &err);
     if (err) {
         log_maxsize = 0;
@@ -180,6 +164,38 @@ prefs_load(char *config_file)
     g_strfreev(triggers);
 }
 
+void
+prefs_reload(void)
+{
+    g_key_file_free(prefs);
+    prefs = NULL;
+
+    prefs = g_key_file_new();
+    g_key_file_load_from_file(prefs, prefs_loc, G_KEY_FILE_KEEP_COMMENTS, NULL);
+
+    _prefs_load();
+}
+
+void
+prefs_load(char *config_file)
+{
+
+    if (config_file == NULL) {
+        prefs_loc = files_get_config_path(FILE_PROFRC);
+    } else {
+        prefs_loc = config_file;
+    }
+
+    if (g_file_test(prefs_loc, G_FILE_TEST_EXISTS)) {
+        g_chmod(prefs_loc, S_IRUSR | S_IWUSR);
+    }
+
+    prefs = g_key_file_new();
+    g_key_file_load_from_file(prefs, prefs_loc, G_KEY_FILE_KEEP_COMMENTS, NULL);
+
+    _prefs_load();
+}
+
 void
 prefs_save(void)
 {

src/config/preferences.h

@@ -169,6 +169,7 @@ typedef struct prof_winplacement_t {
 void prefs_load(char *config_file);
 void prefs_save(void);
 void prefs_close(void);
+void prefs_reload(void);
 
 char* prefs_find_login(char *prefix);
 void prefs_reset_login_search(void);