Improve fish support

Author: zhou13

client/lib/config.fish

@@ -1,6 +1,6 @@
 # For detecting color rendering support for this terminal, see #134
-hishtory getColorSupport
-export _hishtory_tui_color=$status
+set -gx _hishtory_tui_color (hishtory getColorSupport; echo $status)
+
 
 function _hishtory_post_exec --on-event fish_preexec 
     # Runs after <ENTER>, but before the command is executed
@@ -40,4 +40,4 @@ end
 
 [ (hishtory config-get enable-control-r) = true ] && bind \cr __hishtory_on_control_r
 
-hishtory completion fish | source
+hishtory completion fish | source