diff --git a/scripts/generate.in b/scripts/generate.in
new file mode 100644
index 0000000..9b57a99
--- /dev/null
+++ b/scripts/generate.in
@@ -0,0 +1,61 @@
+#!@GUILE@ --no-auto-compile
+-*- scheme -*-
+!#
+
+(use-modules
+ (ice-9 pretty-print)
+ (ice-9 peg)
+ (web uri)
+ (web request))
+
+(define stdout (current-output-port))
+
+(define east-asian-url
+  "https://unicode.org/Public/13.0.0/ucd/EastAsianWidth.txt")
+
+(define emoji-url
+  "https://unicode.org/Public/13.0.0/ucd/emoji/emoji-data.txt")
+
+(define-peg-pattern @hex body (peg "[a-fA-F0-9]"))
+
+(define-peg-pattern @codepoint all
+  (* @hex))
+
+(define-peg-pattern @ea-width-prop all
+  (or "A" "F" "H" "N" "Na" "W"))
+
+(define-peg-pattern @codepoint-range all
+  (or
+   (and @codepoint (ignore "..") @codepoint)
+   @codepoint))
+
+(define-peg-pattern @ea-datum body
+  (and @codepoint-range (ignore ";") @ea-width-prop))
+
+(define-peg-pattern @comment none
+  (and "#" peg-any))
+
+(define-peg-pattern @ea-line body
+  (and (? @ea-datum) (? @comment)))
+
+
+(define (process-east-asian-line line)
+  (let ((tree (peg:tree (match-pattern @ea-line line))))
+     (unless (null? tree)
+       (pk tree))))
+
+
+(define (wget-to-lines url)
+  (string-split (http-get (string->uri url)) #\newline))
+
+(with-output-to-file "../runewidth/table.scm"
+  (λ ()
+
+    (display ";; Code generated by script/generate. DO NOT EDIT\n\n")
+    (display "(define-module (runewidth table))\n\n")
+
+    (format "Downloading and processing from ~a..." east-asian-url)
+    (for-each process-east-asian-line (wget-to-lines east-asian-url)))
+
+    (format "Downloading and processing from ~a..." emoji-url)
+    (for-each process-emoji-line (wget-to-lines emoji-url))))