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;;;; zipper.lisp
(in-package :vampire)
(defun zip-playlist (playlist)
"Compresses playlist tracks into a zip archive."
(unless (zipped-playlist-exists-p playlist)
(let ((zip-file (zipped-playlist-path playlist)))
(ensure-directories-exist zip-file)
(with-temp-dir (tmpdir)
(copy-audio-files-for-download playlist tmpdir)
(zippy:compress-zip
tmpdir zip-file :if-exists :supersede)))))
(defun zip-track-filename (track pos)
"Return a filename for a track. `NN-ARTIST-ALBUM-TITLE.CODEC'"
(with-slots (artist album title codec) track
(clean-filename (format nil "~2,'0d-~a-~a-~a.~a" pos artist album title codec))))
(defun zipped-playlist-filename (playlist)
"Return a url-safe zip filename for a playlist."
(concatenate 'string (clean-filename (playlist-title playlist)) ".zip"))
(defun zipped-playlist-path (playlist)
"Returns the zipped playlist path relative to the configured static directory."
(merge-pathnames (zipped-playlist-url playlist :absolute nil)
(static-directory *config*)))
(defun zipped-playlist-url (playlist &key (absolute t))
"Returns the url where the playlist's zip file is expected to exist."
(format nil "~:[~;/~]media/bundled-playlists/~a"
absolute
(zipped-playlist-filename playlist)))
(defun zipped-playlist-exists-p (playlist)
(uiop:file-exists-p (zipped-playlist-path playlist)))
(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))
(defun make-zipped-playlist-link (playlist context)
(when (zipped-playlist-exists-p playlist)
(create-a context :link (zipped-playlist-url playlist) :content "Download" :target "_blank" :auto-place nil)))
(defun delete-zipped-playlist (playlist-ctl)
"Deletes the zipped playlist file and removes the associated link element.
Returns T if it was deleted, NIL otherwise."
(when (uiop:delete-file-if-exists (zipped-playlist-path (playlist playlist-ctl)))
(unless (null (pl-zip playlist-ctl))
(destroy (pl-zip playlist-ctl)))))
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