77 lines
2.9 KiB
Markdown
77 lines
2.9 KiB
Markdown
# MPD integration
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This page describes an integration with the [Music Player
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Daemon](https://www.musicpd.org/). This consists of two parts: A [[pure Lua
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library for talking to mpc|mpc.lua]] and an example on how to use this for a
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widget with awesome.
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## The library
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The library provides a function `mpc.new` that creates a new object representing
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a connection to MPD. It can be used as follows:
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local connection = require("mpc").new(host, port, password, error_handler, idle_commands...)
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This will establish a TCP connection to the given host and port and, if a
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password is given, log in to the MPD server. Whenever an error happens (for
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example the connection is lost or the password is rejected), the given error
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handler function is called with the error as its argument. The next time the
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connection is used, an automatic reconnection is attempted.
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A description of the MPD protocol can be fined
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[here](https://www.musicpd.org/doc/protocol/). This library only provides
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low-level access to the protocol. However, special support for the idle command
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is provided via extra arguments to the `new` function. This will be made clear
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in an example below.
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For example, to get information about the currently playing song:
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connection:send("currentsong", function(success, data)
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if not success then print("command failed") end
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print("Information about the current song:")
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require("gears.debug").dump(data)
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end)
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## A sample widget
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The following keeps a textbox up-to-date with the MPD status. It automatically
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updates when the current MPD state changes.
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local mpc = require("mpc")
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local textbox = require("wibox.widget.textbox")
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local timer = require("gears.timer")
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local mpd_widget = textbox()
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local state, title, artist, file = "stop", "", "", ""
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local function update_widget()
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local text = "Current MPD status: "
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text = text .. tostring(artist or "") .. " - " .. tostring(title or "")
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if state == "pause" then
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text = text .. " (paused)"
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end
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if state == "stop" then
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text = text .. " (stopped)"
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end
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mpd_widget.text = text
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end
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local connection
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local function error_handler(err)
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mpd_widget:set_text("Error: " .. tostring(err))
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-- Try a reconnect soon-ish
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timer.start_new(10, function()
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connection:send("ping")
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end)
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end
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connection = mpc.new(nil, nil, nil, error_handler,
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"status", function(_, result)
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state = result.state
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end,
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"currentsong", function(_, result)
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title, artist, file = result.title, result.artist, result.file
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pcall(update_widget)
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end)
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If you actually want to be able to control MPD's behaviour, you could for
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example do the following to pause/unpause when clicking on the widget:
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mpd_widget:buttons(awful.button({}, 1, function() connection:toggle_play() end))
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