Tweak elfeed, emms and tame spurious buffers

README.org

@@ -3508,7 +3508,8 @@ initializes a list of =webjump-sites=.
 :CUSTOM_ID: sec:emacs-web-feed-reader
 :END:
 
-Listing [[lst:configure-elfeed]] configures =elfeed=.
+Listing [[lst:configure-elfeed]] configures =elfeed= and makes a minimal attempt to
+enable =emms=.
 
 #+attr_latex: :options breaklines
 #+caption[Configure =elfeed=]:
@@ -3537,7 +3538,11 @@ Listing [[lst:configure-elfeed]] configures =elfeed=.
            ("https://www.bof.nl/rss/" bof)
            ("https://www.democracynow.org/podcast-video.xml" dn)
            ("https://www.laquadrature.net/fr/rss.xml" lqdn)
-           ("https://www.lemonde.fr/blog/huet/feed/" sciences))))))
+           ("https://www.lemonde.fr/blog/huet/feed/" sciences)))))
+
+    (with-eval-after-load 'elfeed-show
+      (when (require 'emms-setup nil 'noerror)
+        (emms-all))))
 #+end_src
 
 ** [[info:emms#Top][Emacs Multimedia System (info)]]
@@ -3546,18 +3551,12 @@ Listing [[lst:configure-elfeed]] configures =elfeed=.
 :END:
 
 The link [[https://sqrtminusone.xyz/posts/2021-09-07-emms/][my emms and elfeed setup]] is a nice introduction to configuring and
-using =emms= with =elfeed=.  Listing [[lst:configure-emms]] configures =emms= for
-use with =elfeed= and listing [[lst:write-mpd-conf]] writes a configuration file for
-the [[https://www.musicpd.org/][Music Player Daemon]].
+using =emms= with =elfeed=.  Listing [[lst:configure-emms]] configures =emms=.
 
 #+caption[Configure =emms=]:
 #+caption: Configure =emms=.
 #+name: lst:configure-emms
 #+begin_src emacs-lisp
-  (with-eval-after-load 'elfeed-show
-    (when (require 'emms-setup nil 'noerror)
-      (emms-all)))
-
   (with-eval-after-load 'emms
     (custom-set-variables
      '(emms-player-list '(emms-player-mpd emms-player-mpv))))
@@ -3592,9 +3591,46 @@ the [[https://www.musicpd.org/][Music Player Daemon]].
     (emms-all))
 #+end_src
 
-#+caption[Write =mpd.conf=]:
-#+caption: Write =mpd.conf=.
-#+name: lst:write-mpd-conf
+*** Taming spurious buffers
+:PROPERTIES:
+:CUSTOM_ID: sec:taming-spurious-buffers
+:END:
+
+When =emms-player-mpd= opens a connection to =mpd=, =mpd= responds with a
+message of the form "OK MPD 0.23.5".  Neither =emms-player-mpd= nor its support
+library =tq= anticipate the "OK MPD 0.23.5" message, but send such messages to a
+new intrusive buffer called =*spurious*=.  Listing [[lst:taming-spurious-buffers]]
+makes those =*spurious*= buffers less intrusive.  See:
+1. [[info:elisp#The Zen of Buffer Display][The Zen of Buffer Display (info)]]
+2. [[https://e17i.github.io/articles-emacs-display-1/][Configuring the Emacs display system]]
+for technical information.
+
+#+caption[Taming =*spurious*= buffers]:
+#+caption: Taming =*spurious*= buffers.
+#+name: lst:taming-spurious-buffers
+#+begin_src emacs-lisp
+  (with-eval-after-load 'emms-player-mpd
+    ;; https://stackoverflow.com/a/47587185 answers:
+    ;; How to avoid pop-up of *Async Shell Command* buffers in Emacs?
+    ;; Avoid popping up of `*spurious*' buffers:
+    (add-to-list 'display-buffer-alist
+                 '("\\*spurious\\*.*"
+                   (display-buffer-at-bottom)
+                   (window-height . fit-window-to-buffer))))
+#+end_src
+
+*** [[https://www.musicpd.org/][Music Player Daemon]] configuration configuration
+:PROPERTIES:
+:CUSTOM_ID: sec:mpd-configuration-file
+:END:
+
+Listing [[lst:make-mpd-conf]] proposes a [[https://www.musicpd.org/][Music Player Daemon]] configuration file that
+keeps each new connection for a day in order to reduce the rate of =*spurious*=
+generation.
+
+#+Caption[A Music Player Daemon configuration file proposal]:
+#+caption: A Music Player Daemon configuration file proposal.
+#+name: lst:make-mpd-conf
 #+begin_src shell :results silent
   case "$(uname -s)" in
       Darwin)
@@ -3608,17 +3644,15 @@ the [[https://www.musicpd.org/][Music Player Daemon]].
   follow_outside_symlinks "yes"
   follow_inside_symlinks  "yes"
 
+  bind_to_address         "localhost"
+  port                    "6600"
+  connection_timeout      "86400"
+
   audio_output {
     type                  "osx"
     name                  "CoreAudio"
     mixer_type            "software"
   }
-
-  bind_to_address         "localhost"
-  connection_timeout      "86400"
-  port                    "6600"
-
-  user                    "$USER"
   EOF
           ;;
   esac