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+;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
+(declaim (optimize (speed 0) (safety 3) (debug 3)))
+
+(defpackage #:music-dispensary
+  (:use #:cl #:cl-log #:hunchentoot)
+  (:export #:music-dispensary))
+
+(in-package #:music-dispensary)
+
+;; ========================================================================== ;;
+
+(defparameter *server-root* (namestring (asdf:system-relative-pathname (intern (package-name *package*)) "./"))
+  "The location of the web server root on the filesystem.")
+
+;; ========================================================================== ;;
+
+(defmacro with-gensyms (syms &body body)
+  `(let ,(mapcar #'(lambda (s)
+                     `(,s (gensym)))
+                 syms)
+     ,@body))
+
+(defmacro once-only ((&rest names) &body body)
+  (let ((gensyms (loop for n in names collect (gensym))))
+    `(let (,@(loop for g in gensyms collect `(,g (gensym))))
+       `(let (,,@(loop for g in gensyms for n in names collect ``(,,g ,,n)))
+          ,(let (,@(loop for n in names for g in gensyms collect `(,n ,g)))
+             ,@body)))))
+
+(defun logger (output)
+  "Logs output to the cl-log log file."
+  (log-message :info (format nil "~a: ~a" (net.telent.date:universal-time-to-rfc2822-date (get-universal-time)) output)))
+
+(defmacro add-to-list (output-list &rest value-to-add)
+  "Wraps the SETF...APPEND idiom in a smaller package."
+  `(setf ,output-list (append ,output-list ,@value-to-add)))
+
+(defun match-it (regex field)
+  "Wraps a PCRE search in a smaller package."
+  (cl-ppcre:all-matches-as-strings regex field))
+
+(defun map-slot-names (instance)
+  "Returns a list of the names of all the slots of any class instance
+using reflection. The returned values are symbols. Only works with
+SBCL. Implementations for other lisps welcome."
+  #+sbcl
+  (mapcar #'sb-mop:slot-definition-name
+          (sb-mop:class-slots (class-of instance))))
+
+(defun make-document-root-path (document-root relative-path)
+  "Makes a relative filesystem path into a full one, using
+`document-root' as the base."
+  (concatenate 'string document-root relative-path))
+
+(defun make-server-path (relative-path)
+  "Makes a relative filesystem path into a full one, using
+`*server-root*' as the base."
+  (make-document-root-path *server-root* relative-path))
+
+(defun null-or-empty-p (sequence)
+  (or (null sequence) (equal (length sequence) 0)))
+
+(defun shell-wrapper (command)
+  "Calls a shell command and returns the output as a list, where each
+atom of the list is a string that contains one line of the output."
+  (let ((output (make-array '(0) :element-type 'character :fill-pointer 0 :adjustable t)))
+    (with-output-to-string (stream output)
+      (uffi:run-shell-command command :output stream))
+    (loop for line in (ppcre:split #\Newline output)
+       collect line)))
+
+(defun reduce-to-char-separated-string (mylist char)
+  (format nil "~a" (reduce (lambda (&optional x y)
+                             (cond ((and x y) (format nil "~a~a~a" x char y))
+                                   ((and x (not y)) (format nil "~a" x))
+                                   ((and (not x) y) (format nil "~a" y))
+                                   (t "")))
+                           mylist)))
+
+(defun reduce-to-comma-separated-string (mylist)
+  (reduce-to-char-separated-string mylist ","))
+
+(defun reduce-to-newline-separated-string (mylist)
+  (reduce-to-char-separated-string mylist #\Newline))