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bug#8293: mpc.el: "error in process filter"

From: axel . junker
Subject: bug#8293: mpc.el: "error in process filter"
Date: Sat, 19 Mar 2011 12:04:14 -0400

I am using a semi-fresh build of emacs master on i686-pc-linux-gnu. This is a 
bug report concerning mpc.el. I have not modifier mpc.el or its variables so 

When selecting an album in the "Albums | Playlists"-view (upper right corner), 
mpc.el issues a find command regarding Albums and Playlists
E.g. for an Album called 2001:

Send "(find Album 2001)"
Receive "file: dr. dre - 2001/Dr. Dre - Lolo.mp3
        Time: 42
        Artist: Dr. Dre
        Title: Lolo
        file: dr. dre - 2001/Dr. Dre - Bang Bang.mp3
        Time: 222
        Artist: Dr. Dre
        Title: Bang Bang
        Album: 2001
        Track: 21
        Genre: Hip-Hop
Send "(listplaylistinfo 2001)"
Receive "ACK address@hidden {listplaylistinfo} No such playlist

mpc--proc-filter regards "ACK address@hidden {listplaylistinfo} No such 
playlist" to be an error and signals an mpc-proc-error.
In mpc-cmd-find (mpc.el:599) the mpc-proc-cmd that issues that 
listplaylistinfo-request explicitly ignores any error by wrapping the 
invocation in a condition-case with a nil error handler.
Unfortunately this does not work. As the error is signaled by a process filter, 
emacs itself issues an error in process.c . That means, the signal never 
escapes the process filter. This leads to an ugly error output and the album 
selection does not work at all.

I think this is a bug.

In GNU Emacs (i686-pc-linux-gnu, GTK+ Version 2.22.0)
 of 2011-03-03 on ghost
Windowing system distributor `The X.Org Foundation', version 11.0.10900000
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Recent messages:
error in process filter: mpc--proc-filter: MPD error
error in process filter: MPD error

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