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;;;; zipper.lisp
(in-package :vampire)
(defun zip-playlist (playlist)
"Compresses playlist tracks into a zip archive."
(with-temp-dir (tmpdir)
(let ((zip-dir (zipped-playlist-path)))
(ensure-directories-exist zip-dir)
(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'"
(with-slots (artist album title codec) track
(format nil "~2,'0d-~a-~a-~a.~a" pos
(clean-slashes artist) (clean-slashes album) (clean-slashes title) codec)))
(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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