From 7a1e8d41ce96a7514adb31529f05aaed6a13c259 Mon Sep 17 00:00:00 2001
From: Grant Shangreaux <grant@unabridgedsoftware.com>
Date: Tue, 27 Dec 2022 19:22:46 -0600
Subject: Clean: zipper.lisp implementation and defuns, fewer iterations

---
 utilities.lisp |  3 +++
 zipper.lisp    | 48 +++++++++++++++++++++++++-----------------------
 2 files changed, 28 insertions(+), 23 deletions(-)

diff --git a/utilities.lisp b/utilities.lisp
index 1ed13a3..0e258b6 100644
--- a/utilities.lisp
+++ b/utilities.lisp
@@ -127,3 +127,6 @@
     (if (apply pred args)
         (apply then args)
         (apply else args))))
+
+(defun clean-slashes (str)
+  (cl-ppcre:regex-replace-all "/" str "-"))
diff --git a/zipper.lisp b/zipper.lisp
index 2151019..36e62f9 100644
--- a/zipper.lisp
+++ b/zipper.lisp
@@ -3,29 +3,12 @@
 (in-package :vampire)
 
 (defun zip-playlist (playlist)
-  "Copies all playlist tracks into a download directory and compresses them into a zip archive.
-Returns the filename of the zip file."
+  "Compresses playlist tracks into a zip archive."
   (with-temp-dir (tmpdir)
-    (let* ((tracks (mapcar (lambda (track) (merge-pathnames tmpdir track))
-                           (zip-playlist-filenames playlist)))
-           (zip-dir (merge-pathnames "media/bundled-playlists" (static-directory *config*)))
-           (out (format nil "~a/~a.zip" zip-dir (clean-slashes (playlist-title playlist)))))
+    (let ((zip-dir (zipped-playlist-path)))
       (ensure-directories-exist zip-dir)
-      (copy-audio-files-for-download playlist tmpdir)
-      (org.shirakumo.zippy:compress-zip tracks out :if-exists :overwrite)
-      (format nil "/media/bundled-playlists/~a.zip" (clean-slashes (playlist-title playlist))))))
-
-(defun copy-audio-files-for-download (playlist dir)
-  (let ((audio-files (mapcar #'track-file (playlist-tracks playlist)))
-	(dest-files (zip-playlist-filenames playlist)))
-    (loop for file in audio-files
-	  for dest in dest-files
-	  do (uiop:copy-file file (format nil "~a~a" dir dest)))))
-
-(defun zip-playlist-filenames (playlist)
-   (loop for track in (playlist-tracks playlist)
-	 for i from 1
-	 collect (zip-track-filename track i)))
+      (org.shirakumo.zippy:compress-zip
+       (copy-audio-files-for-download playlist tmpdir) zip-dir :if-exists :overwrite))))
 
 (defun zip-track-filename (track pos)
   "Return a filename for a track. `NN-ARTIST-ALBUM-TITLE.CODEC'"
@@ -33,5 +16,24 @@ Returns the filename of the zip file."
     (format nil "~2,'0d-~a-~a-~a.~a" pos
 	    (clean-slashes artist) (clean-slashes album) (clean-slashes title) codec)))
 
-(defun clean-slashes (str)
-  (cl-ppcre:regex-replace-all "/" str "-"))
+(defun zipped-playlist-filename (playlist)
+  "Return a url-safe zip filename for a playlist."
+  (concatenate 'string (clean-slashes (playlist-title playlist)) ".zip"))
+
+(defun zipped-playlist-path (playlist)
+  "Returns the zipped playlist path relative to the configured static directory."
+  (merge-pathnames (pathname-utils:to-relative (zipped-playlist-url playlist))
+                   (static-directory *config*)))
+
+(defun zipped-playlist-url (playlist)
+  "Returns the url where the playlist's zip file is expected to exist."
+  (merge-pathnames (zipped-playlist-filename playlist) "/media/bundled-playlists/"))
+
+(defun copy-audio-files-for-download (playlist dir)
+  "Copies all playlist tracks into a temporary directory and returns a list of the pathnames."
+  (loop for track in (playlist-tracks playlist)
+        for pos from 1
+        for file = (track-file track)
+        for dest = (merge-pathnames (zip-track-filename track pos) dir)
+        do (uiop:copy-file file dest)
+        collect dest))
-- 
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