Eliminate the circular dependency between chess-pos and chess-fen.

We remove functions chess-pos-to-string and chess-pos-from-string which
are really just aliases for chess-fen-to-pos and chess-pos-to-fen.

chess-crafty.el

@@ -22,6 +22,7 @@
 ;;; Code:
 
 (require 'chess-common)
+(require 'chess-fen)
 (require 'chess-var)
 
 (defgroup chess-crafty nil
@@ -131,7 +132,7 @@
 
      ((eq event 'setup-pos)
       (chess-engine-send nil (format "setboard %s\n"
-				     (chess-pos-to-string (car args)))))
+				     (chess-pos-to-fen (car args)))))
 
      ((eq event 'evaluate)
       (setq chess-crafty-evaluation nil)

chess-fen.el

@@ -57,14 +57,15 @@
 
 ;;; Code:
 
+(require 'chess-pos)
 (eval-when-compile (require 'cl-lib))
 
 (defconst chess-fen-regexp
   "^\\([bnrqkpBNRQKP1-8]*/?\\)+ [bw] \\(-\\|[KQkq]+\\) \\(-\\|[1-8]\\)")
 
 (defun chess-fen-to-pos (fen)
   "Convert a FEN-like notation string to a chess position."
-  (assert (stringp fen))
+  (cl-assert (stringp fen))
   (let ((i 0) (l (length fen))
 	(rank 0) (file 0) (c ?0)
 	(position (chess-pos-create t))
@@ -117,7 +118,7 @@
 (defun chess-pos-to-fen (position &optional full)
   "Convert a chess POSITION to FEN-like notation.
 If FULL is non-nil, represent trailing spaces as well."
-  (assert (vectorp position))
+  (cl-assert (vectorp position))
   (let ((blank 0) (str "") output)
     (dotimes (rank 8)
       (dotimes (file 8)

chess-file.el

@@ -27,6 +27,8 @@
 
 ;;; Code:
 
+(require 'chess-fen)
+
 (defvar chess-file-locations nil
   "A list of starting positions of individual records of this collection.")
 (make-variable-buffer-local 'chess-file-locations)

chess-gnuchess.el

@@ -22,6 +22,7 @@
 ;;; Code:
 
 (require 'chess-common)
+(require 'chess-fen)
 
 (defgroup chess-gnuchess nil
   "The publically available chess engine 'gnuchess'."
@@ -69,7 +70,7 @@
 
      ((eq event 'setup-pos)
       (let ((file (chess-with-temp-file
-		      (insert (chess-pos-to-string (car args)) ?\n))))
+		      (insert (chess-pos-to-fen (car args)) ?\n))))
 	(chess-engine-send nil (format "epdload %s\n" file))))
 
      ((eq event 'setup-game)

chess-network.el

@@ -1,9 +1,28 @@
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;;
-;; Play against an opponent over the network
-;;
+;;; chess-network.el --- Play against an opponent over the network
+
+;; Copyright (C) 2002, 2003, 2008  Free Software Foundation, Inc.
+
+;; Author: John Wiegley <johnw@gnu.org>
+;; Maintainer: Mario Lang <mlang@delysid.org>
+;; Keywords: games
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
 
 (require 'chess-common)
+(require 'chess-fen)
 
 (defvar chess-network-regexp-alist
   (list
@@ -140,7 +159,7 @@
 
      ((eq event 'setup-pos)
       (chess-engine-send nil (format "fen %s\n"
-				     (chess-pos-to-string (car args)))))
+				     (chess-pos-to-fen (car args)))))
 
      ((eq event 'setup-game)
       (chess-engine-send nil (format "pgn %s\n"

chess-pos.el

@@ -84,7 +84,6 @@
 ;;; Code:
 
 (require 'chess-message)
-(require 'chess-fen)
 (eval-when-compile
   (require 'cl-lib)
   (cl-proclaim '(optimize (speed 3) (safety 2))))
@@ -679,19 +678,6 @@ The current side-to-move is always white."
 	       [nil nil nil nil nil nil t nil nil nil nil])
     (chess-pos-copy chess-starting-position)))
 
-(defsubst chess-pos-to-string (position &optional full)
-  "Convert the given POSITION into a string.
-The returned string can be converted back to a position using
-`chess-pos-from-string'."
-  (cl-assert (vectorp position))
-  (chess-pos-to-fen position full))
-
-(defsubst chess-pos-from-string (string)
-  "Convert the given STRING to a chess position.
-This string should have been created by `chess-pos-to-string'."
-  (cl-assert (stringp string))
-  (chess-fen-to-pos string))
-
 (defconst chess-pos-piece-values
   '((?p . 1)
     (?n . 3)

chess-sjeng.el

@@ -1,4 +1,4 @@
-;;; chess-sjeng.el --- Play chess against sjeng!
+;;; chess-sjeng.el --- Play against sjeng!
 
 ;; Copyright (C) 2004  Free Software Foundation, Inc.
 
@@ -21,6 +21,7 @@
 ;;; Code:
 
 (require 'chess-common)
+(require 'chess-fen)
 
 (defgroup chess-sjeng nil
   "The publically available chess engine 'sjeng'."
@@ -73,7 +74,7 @@
 
      ((eq event 'setup-pos)
       (chess-engine-send nil (format "setboard %s\n"
-				     (chess-pos-to-string (car args)))))
+				     (chess-pos-to-fen (car args)))))
 
      ((eq event 'move)
       (when (= 1 (chess-game-index game))