Broken code

uniseg/graphemes/stream.scm

@@ -122,28 +122,33 @@
       (else (values 'any #t))))
 
 
-  (define glyphs-reverse '())
-  (define grapheme-width 0)
+  (define %glyphs-reverse '())
+  (define %grapheme-width 0)
 
   (define hit-eof #f)
 
   (define (iterate-through-grapheme state)
-    (define glyph (get-char port))
-    (if
-     (eof-object? glyph)
+    (define glyph (peek-char port))
+    (if (eof-object? glyph)
+        (begin
+          (set! hit-eof #t)
+          state)
      (begin
-       (set! hit-eof #t)
-       state)
-     (begin
-       (set! glyphs-reverse (cons glyph glyphs-reverse))
        (let* ((width property (char-width glyph))
               (next-state boundary? (state-machine state property)))
 
-         (set! grapheme-width (+ grapheme-width width))
+         (pk width next-state)
 
          (if boundary?
              state
-             (iterate-through-grapheme state))))))
+             (let ((new-width (+ %grapheme-width width))
+                   (new-glyphs-reverse (cons glyph %glyphs-reverse)))
+
+               ;; Officially induct this char into the cluster
+               (get-char port)
+               (set! %grapheme-width new-width)
+               (set! %glyphs-reverse new-glyphs-reverse)
+               (iterate-through-grapheme state)))))))
 
   (define final-state (iterate-through-grapheme 'any))
 
@@ -152,8 +157,8 @@
    stream-null
    (stream-cons
     (make-grapheme
-     grapheme-width
+     %grapheme-width
      ;; Delay to avoid construction of unnecessary lists and strings!
-     (delay (reverse-list->string glyphs-reverse))
-     (delay (reverse glyphs-reverse)))
+     (delay (reverse-list->string %glyphs-reverse))
+     (delay (reverse %glyphs-reverse)))
     (input->grapheme-stream port))))