Store the cursor position in TO-COMPLETE tokens in order to restore

the cursor position after completion.

scheme/cmdline.scm

@@ -59,19 +59,20 @@
       (integer? (token-cursor-pos token))))
 
 (define-record-type to-complete :to-complete
-  (make-to-complete prefix)
+  (make-to-complete prefix pos)
   to-complete?
-  (prefix to-complete-prefix))
+  (prefix to-complete-prefix)
+  (pos to-complete-pos))
 
 (define-record-discloser :to-complete
   (lambda (r)
-    `(to-complete ,(to-complete-prefix r))))
+    `(to-complete ,(to-complete-prefix r) ,(to-complete-pos r))))
 
 (define to-complete-without-prefix?
   to-complete-prefix)
 
-(define (make-empty-to-complete)
-  (make-to-complete #f))
+(define (make-empty-to-complete pos)
+  (make-to-complete #f pos))
 
 (define operator-chars (char-set #\& #\| #\< #\> #\, #\;))
 
@@ -117,8 +118,6 @@
 
 (define (lex-port cursor-index port)
   (let lp ((c (peek-char port)) (tokens '()))
-    (display (list c (current-column port)))
-    (newline)
     (cond
      ((eof-object? c)
       (reverse tokens))
@@ -137,7 +136,7 @@
 	(read-char port)
 	(lp (peek-char port)
 	    (if (and cursor-index (= cursor-index pos))
-		(cons (make-empty-to-complete) tokens)
+		(cons (make-empty-to-complete pos) tokens)
 		tokens))))
      (else
       (let ((token (lex-token cursor-index port)))
@@ -214,7 +213,7 @@
    ((to-complete? t) 
     t)
    ((cursor-on-token? t)
-    (make-to-complete (token-token t)))
+    (make-to-complete (token-token t) (token-start-pos t)))
    (else 
     (token-token t))))
 
@@ -344,7 +343,9 @@
     (let lp ((tokens tokens))
       (cond 
        ((null? tokens)
-	#f)
+	(make-command-line 
+	 (make-command (make-to-complete #f 0) '() '())
+	 '() #f))
        ((parse-command-line-carefully tokens)
 	=> (lambda (v) v))
        (else