pretty printing markov generated books

.gitignore

@@ -0,0 +1,3 @@
+kjv.txt
+markov.chicken.so
+markov.import.scm

COPYING

@@ -0,0 +1,202 @@
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markov.chicken.scm

@@ -1,4 +1,44 @@
 (module markov
-  (make-table-from-file guess-sentence generate-next-word)
+  (make-table-from-file
-  (import scheme (chicken base) srfi-69)
+   guess-sentence
+   generate-next-word
+   join-verses
+   %random-seed
+   seed-from-entropy)
+  (import scheme (chicken base) srfi-69
+          (chicken format)
+          (chicken random)
+          srfi-4)
+  (define (seed-from-entropy)
+    (let ((bytes (blob->u8vector (random-bytes))))
+      (set! %random-seed (+ (u8vector-ref bytes 0)
+                            (* 255 (u8vector-ref bytes 1))))))
+  (define (join-verses* lst str book chapter verse)
+    (if (null? lst)
+        str
+        (let* ((cur (car lst))
+               (first-character (if (= (string-length cur) 0)
+                                    #f
+                                    (string-ref cur 0)))
+               (rest (cdr lst)))
+          (cond
+            ((not (char? first-character)) (join-verses* rest str
+                                                         book chapter verse))
+            ((equal? cur "startofbook")
+             (join-verses* rest (sprintf "~A~%~%~%" str) (+ book 1) 1 1))
+            ((equal? cur "startofchapter")
+             (join-verses* rest (sprintf "~A~%~%" str) book (+ 1 chapter) 1))
+            ((equal? cur "startofverse")
+             (join-verses* rest (sprintf "~A~%~A:~A:~A"
+                                         str book chapter verse)
+                           book chapter (+ 1 verse)))
+            ((or (char-alphabetic? first-character)
+                 (char-numeric? first-character))
+             (join-verses* rest (string-append str " " cur)
+                           book chapter verse))
+            (else (join-verses* rest (string-append str cur)
+                                book chapter verse))))))
+  (define (join-verses lst)
+    (string-append (join-verses* lst "THE BOOK OF MARKOV" 1 0 1)
+                   "\n"))
   (include "markov.impl.scm"))

markov.impl.scm

@@ -168,14 +168,16 @@
     (newline)))
 
 ;;; Lehmer random number generator
+
+(define %random-seed 10000)
+
 (define random
   (let ((m 65537)
-        (a 75)
+        (a 75))
-        (previous 10000))
     (lambda ()
-      (set! previous (remainder (* a previous)
+      (set! %random-seed (remainder (* a %random-seed)
                                     m))
-      (/ previous (- m 1)))))
+      (/ %random-seed (- m 1)))))
 
 (define probability-list->guess
   (lambda (lst normalized-random-number)

toplevel.scm

@@ -17,10 +17,17 @@
                         '()
                         limits))
 
+
 (define (make-a-bible-verse)
   (generate-until-word '("startofverse" "startofchapter" "startofbook")))
 
 (define (make-a-book-of-the-bible)
   (generate-until-word '("startofbook")))
 
-(display "Try (make-a-bible-verse) and (make-a-book-of-the-bible).\n")
+(define (display-a-book-of-the-bible)
+  (display (join-verses (make-a-book-of-the-bible))))
+
+(display "Seeding from truly random source...\n")
+(seed-from-entropy)
+(display "Try (make-a-bible-verse) and (display-a-book-of-the-bible).\n")
+