97 lines
3.5 KiB
EmacsLisp
97 lines
3.5 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 'subr-x)
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(require 'seq)
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(require 'emms)
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(require 'emms-source-file)
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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-auto-playlist-from-git-annex-find
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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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(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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(defun db/play-auto-playlist-from-git-annex-find ()
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"Interactively query user for a git-annex match expression and
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play resulting list of audio files.
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See `db/playlist-files-from-git-annex-find’ for more details."
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(interactive)
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(db/-emms-playlist-from-files
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(call-interactively #'db/playlist-files-from-git-annex-find)))
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(provide 'db-music)
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;;; db-music ends here
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