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;;;; 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)))))
(eval-when (:compile-toplevel :load-toplevel :execute)
(defun starts-with-vowel-p (string)
(find (elt string 0) "aeiou" :test #'char-equal)))
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