Reorganized codebase

1 files changed, 68 insertions, 0 deletions

diff --git a/src/utilities.lisp b/src/utilities.lisp
new file mode 100644
index 0000000..1e16931
--- /dev/null
+++ b/src/utilities.lisp
@@ -0,0 +1,68 @@
+;;;; utilities -- nuff said
+
+(in-package :dnd)
+
+
+(let ((host (uiop:hostname))
+      (count 0))
+  (defun nuid ()
+    "Generates a Nearly Universal ID"
+    (format nil "~36r"
+            (sxhash
+             (list
+              (incf count)
+              host
+              (get-universal-time))))))
+
+(defun hash-string (plaintext salt)
+  "Hash plaintext using SALT"
+  (flexi-streams:octets-to-string 
+   (ironclad:digest-sequence
+    :sha3
+    (flexi-streams:string-to-octets (concatenate 'string salt plaintext)
+                                    :external-format :utf-8))
+   :external-format :latin1))
+
+(defparameter +user-nick-chars+ "0123456789abcdefghijklmnopqrstuvwxyz-._")
+
+(defun/t valid-nick-p (nick)
+  :tests
+  (eql ("??????") nil)
+  (eql ("⚔") nil)
+  (eql ("cool_beans") t)
+  (eql ("COOOL_BEANS") t)
+  (eql ("COOL beans") nil)
+  :end 
+  (unless (zerop (length nick))
+    (loop :for char :across nick
+          :always (find char +user-nick-chars+
+                        :test #'char-equal))))
+
+(defun/t asciip (thing)
+  "T if THING is an ASCII character, NIL otherwise."
+  :tests
+  (eql (#\x) t)
+  (eql (#\ö) nil)
+  (eql (#\nul) t)
+  (eql (#\return) t)
+  (eql (nil) nil)
+  (eql ("foo") nil)
+  :end
+  (and (characterp thing)
+       (<= 0 (char-code thing) 127)))
+
+(defun/t urlify (string &optional (sub #\-))
+  "Canonical transformation for strings that makes them appropriate for urls."
+  :tests
+  (equal ("THIS IS COOL") "this-is-cool")
+  (equal ("This      is cool") "this-is-cool")
+  (equal ("Mc'this is κoöl   ") "mc-this-is-o-l")
+  :end
+  (str:join
+   sub
+   (str:split-omit-nulls
+    #\space
+    (substitute-if-not
+     #\space
+     (a:conjoin #'asciip #'alphanumericp)
+     (string-downcase string)))))