fix: all: fixes to get emacs-chess working on 30.2

- added lexical-binding headers to all source files
- replaced make-variable-buffer-local with defvar-local throughout source code
- replaced deprecated cl library with cl-lib, including replacing assert with cl-assert to emacs-chess-steps.el
- added proper headers and footers to test files when missing
- populated chess images and chess sounds directory
- fixed defcustom calling directory-files without error handling.
  xboard installation no longer required.

1 files changed, 7 insertions, 14 deletions

diff --git a/chess-irc.el b/chess-irc.el
index d29e3d3..996e45a 100644
--- a/chess-irc.el
+++ b/chess-irc.el
@@ -1,4 +1,4 @@
-;;; chess-irc.el --- This transport uses an IRC bot to send/receive moves.
+;;; chess-irc.el --- This transport uses an IRC bot to send/receive moves.  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 2014 Free Software Foundation, Inc.
 
@@ -57,19 +57,12 @@
 			 (chess-message 'opponent-says
 					(match-string 0))))))))
 
-(defvar chess-irc-process)
-(defvar chess-irc-engine)
-(defvar chess-irc-opponent)
-(defvar chess-irc-working nil)
-(defvar chess-irc-last-pos nil)
-(defvar chess-irc-use-ctcp nil)
-
-(make-variable-buffer-local 'chess-irc-process)
-(make-variable-buffer-local 'chess-irc-engine)
-(make-variable-buffer-local 'chess-irc-opponent)
-(make-variable-buffer-local 'chess-irc-working)
-(make-variable-buffer-local 'chess-irc-last-pos)
-(make-variable-buffer-local 'chess-irc-use-ctcp)
+(defvar-local chess-irc-process nil)
+(defvar-local chess-irc-engine nil)
+(defvar-local chess-irc-opponent nil)
+(defvar-local chess-irc-working nil)
+(defvar-local chess-irc-last-pos nil)
+(defvar-local chess-irc-use-ctcp nil)
 
 (defun chess-irc-handler (game event &rest args)
   "This is an example of a generic transport engine."