138 lines
5.2 KiB
EmacsLisp
138 lines
5.2 KiB
EmacsLisp
;;; db-music.el -- Music related stuff -*- lexical-binding: t -*-
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;;; Commentary:
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;;; Code:
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(require 'dash)
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(require 'emms)
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(defgroup db-music nil
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"General configurations for music-related functionality."
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:prefix "db-music"
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:group 'convenience
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:tag "db-music")
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(defcustom db/auto-playlist-file-function #'db/play-playlist-from-cache
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"Function that has to return a list of all music files that
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should be included in the auto playlist."
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:group 'db-music
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:type 'function)
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(defun db/play-auto-playlist ()
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"Generate playlist using `db/auto-playlist-file-function’ and
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start playing it.
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Current backend is EMMS."
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(interactive)
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(db/-emms-playlist-from-files (funcall db/auto-playlist-file-function)))
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;; Idea: make this customizable, so that we can later switch to another backend
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;; if necessary
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(defun db/-emms-playlist-from-files (files)
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"Generate EMMS playlist from FILES.
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Shuffle it and start playing it afterwards."
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(when (seq-empty-p files)
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(user-error "List of files is empty, nothing to do"))
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(save-window-excursion
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(let ((music-buffer-name "*EMMS Playlist* -- Personal"))
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(unless (get-buffer music-buffer-name)
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(emms-playlist-new music-buffer-name))
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(with-current-buffer (get-buffer music-buffer-name)
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(emms-stop)
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(emms-playlist-set-playlist-buffer)
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(emms-playlist-current-clear)
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(dolist (track files)
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(emms-playlist-current-insert-source 'emms-insert-file track))
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(goto-char (point-min))
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(emms-shuffle)
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(emms-playlist-select-first)
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(emms-start)))))
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(defcustom db/playlist nil
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"List of songs to include in a random playlist."
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:group 'db-music
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:type '(alist :value-type (choice (const :tag "Undecided" :undecided)
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(const :tag "Include" :include)
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(const :tag "Exclude" :exclude))
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:key-type file))
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(defun db/playlist-files-from-cache ()
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"Generate files for auto playlist from `db/playlist’ cache."
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(interactive)
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(->> db/playlist
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(cl-remove-if-not #'(lambda (track)
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(eq (cdr track) :include)))
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(mapcar #'car)))
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(defun db/update-playlist-cache-from-directory (directory)
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"Recursively traverse DIRECTORY and update `db/playlist’.
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Files not present `db/playlist’ but that are found in DIRECTORY
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are added to `db/playlist’ with tag :undecided, to show the user
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that these files are new. Tracks in `db/playlist’ that do not
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exist anymore are removed from it."
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(interactive (list (expand-file-name "songs/"
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emms-source-file-default-directory)))
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;; First convert to hash table for performance
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(let ((playlist-hash (make-hash-table :test #'equal)))
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(dolist (track db/playlist)
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(when (file-exists-p (car track))
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(puthash (car track) (cdr track) playlist-hash)))
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(let (new-playlist)
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;; Iterate over files in DIRECTORY and add them to the playlist, with the
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;; already known state whenever possible
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(dolist (file (directory-files-recursively directory ""))
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(message "Checking %s" file)
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(push (cons file (gethash file playlist-hash :undecided))
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new-playlist)
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(remhash file playlist-hash))
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;; Keep all other tracks that are not in DIRECTORY
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(maphash #'(lambda (track state)
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(push (cons track state) new-playlist))
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playlist-hash)
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;; Sort to keep version control happy
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(setq new-playlist
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(sort new-playlist
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#'(lambda (track-1 track-2)
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(string< (car track-1) (car track-2)))))
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;; Save and exit
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(customize-save-variable 'db/playlist new-playlist))))
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(defun db/playlist-files-from-git-annex-find (match-expression)
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"Generate playlist from git annex find on MATCH-EXPRESSION.
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Prompts for MATCH-EXPRESSION when called interactively.
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Generates playlist that is comprised of exactly those files that
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are match it. Assumes `emms-source-file-default-directory’ to be
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part of a git-annex repository, and will complain otherwise."
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(interactive "smatch expression: ")
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(let* ((default-directory emms-source-file-default-directory))
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(->> (split-string (with-output-to-string
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(with-current-buffer standard-output
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(let ((return-value (apply #'call-process
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"git" nil t nil
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"annex" "find"
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(split-string match-expression))))
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(unless (zerop return-value)
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(error "Call to `git-annex-find’ failed: %s"
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(buffer-string))))))
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"\n")
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(cl-remove-if-not #'(lambda (path)
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(and (not (string-empty-p path))
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(file-exists-p path)
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(file-readable-p path))))
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(mapcar #'(lambda (path)
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(expand-file-name
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path
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emms-source-file-default-directory))))))
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(provide 'db-music)
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;;; db-music ends here
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