Moss - create and execute playlists of arbitrary commands

I've been a happy user of MPD for several years, but I've often found that I want to put other things in my playlist besides audio files under a specific directory on my filesystem--and even if I could put those things in my playlist, MPD wouldn't know how to play them. To this end, I've created Moss, a client/server program that allows you to put whatever you want in a playlist. By default, playlist items are passed to /bin/sh -c for execution, but Moss can easily be configured to invoke a different program if the item matches a given regular expression.
For mpc users, the interface should be very familiar. Essentially no setup is required, except for optionally writing a ~/.mossrc or ~/.config/mossrc file (you could use the example file from the git repo as a starting point).
An AUR package is available. Let me know if you find a bug, have a suggestion, or just want to give general feedback.

So this hasn't got much attention, but I've been using Moss for the past week or so and have found it to be useful and stable, so I implemented a couple more features and pushed out version 1.0.0. One of the new features is the -stdin flag, which allows additional arguments to be read from standard input. Among other things, this is useful for saving and loading playlists to/from files using moss ls > file and moss -stdin add < file. You could also shuffle the current playlist using (moss ls | shuf && moss clear) | moss -stdin add.
The other new feature is an optional <format> argument to the status command, which lets you easily print specific information like playlist index, playlist length, current item, process ID of current command, et cetera. If you have a song currently playing and want to view its metadata, you could use something like soxi `moss status %f`--or remove everything before the current playlist item using seq $(expr `moss status %i` - 1) | moss -stdin del.
The point is, I think I've made something that's nicely programmable and "composable", where a lot of functionality emerges from the design. There are probably a number of potential applications and patterns that haven't occurred to me yet.

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Moss - create and execute playlists of arbitrary commands

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