readline

kekkonen.scm

@@ -7,6 +7,7 @@
 (import fmt)
 (import ansi-escape-sequences)
 (import (chicken file))
+(import breadline)
 
 (define (lift fn parser)
   (bind parser (compose result fn)))
@@ -84,30 +85,38 @@
 
 (define (prompt str)
   (newline)
-  (display str)
-  (let ((result (read-line)))
+  (let ((result (readline str)))
     (if (equal? "" result)
 	(prompt str)
-	result)))
+	(begin
+	  (add-history! result)
+	  result))))
 
 (define (prompt-yn str)
   (newline)
-  (display str)
-  (let ((result (string-downcase (read-line))))
+  (let ((result (string-downcase (readline str))))
     (cond ((equal? "yes" result) #t)
-	  ((equal? "no" result) #t)
+	  ((equal? "no" result) #f)
 	  (else (begin
 		  (newline)
 		  (display "Please answer yes or no.")
 		  (prompt-yn str))))))
 
+(define (prompt-default str default)
+  (map stuff-char (string->list default))
+  (let loop ()
+    (let ((result (readline str)))
+      (if (equal? "" result)
+	  (loop)
+	  result))))
+
 (define +articles-prepositions+
   '(a an the into on to at as))
 
 (define (adventure-prompt)
   (let ((result (parse (completely-parse parse-statement) (prompt "> "))))
     (if result
-	(let ((grug-result (filter (lambda (n) (not (member n +articles-prepositions+))) result)))
+	(let ((grug-result (filter (compose not (cut member <> +articles-prepositions+)) result)))
 	  (if (not (null? grug-result))
 	      grug-result
 	      (begin (display "I didn't quite understand that.")
@@ -300,7 +309,7 @@
 	      (print-room-description (get-container 'you))))))))
 
 (define (do-command-save)
-  (let ((save-name (prompt "Enter save name: ")))
+  (let ((save-name (prompt-default "Enter save name: " "kekkonen.sav")))
     (if (or (not (file-exists? save-name)) (prompt-yn "That file already exists. Overwrite? "))
 	(begin
 	  (show "Saving database, please wait...")