dev-haskell/dbus/metadata.xml


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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<maintainer type="project">
		<email>haskell@gentoo.org</email>
	</maintainer>
	<longdescription>
		D-Bus is a simple, message-based protocol for inter-process
		communication, which allows applications to interact with other parts of
		the machine and the user's session using remote procedure calls.
		
		D-Bus is a essential part of the modern Linux desktop, where it replaces
		earlier protocols such as CORBA and DCOP.
		
		This library is an implementation of the D-Bus protocol in Haskell. It
		can be used to add D-Bus support to Haskell applications, without the
		awkward interfaces common to foreign bindings.
		
		Example: connect to the session bus, and get a list of active names.
		
		@
		&amp;#x7b;-\# LANGUAGE OverloadedStrings \#-&amp;#x7d;
		
		import Data.List (sort)
		import DBus
		import DBus.Client
		
		main = do
		&amp;#x20;   client &lt;- connectSession
		&amp;#x20;   //
		&amp;#x20;   \-- Request a list of connected clients from the bus
		&amp;#x20;   reply &lt;- call_ client (methodCall \"\/org\/freedesktop\/DBus\" \"org.freedesktop.DBus\" \"ListNames\")
		&amp;#x20;       &amp;#x7b; methodCallDestination = Just \"org.freedesktop.DBus\"
		&amp;#x20;       &amp;#x7d;
		&amp;#x20;   //
		&amp;#x20;   \-- org.freedesktop.DBus.ListNames() returns a single value, which is
		&amp;#x20;   \-- a list of names (here represented as [String])
		&amp;#x20;   let Just names = fromVariant (methodReturnBody reply !! 0)
		&amp;#x20;   //
		&amp;#x20;   \-- Print each name on a line, sorted so reserved names are below
		&amp;#x20;   \-- temporary names.
		&amp;#x20;   mapM_ putStrLn (sort names)
		@
		
		&gt;$ ghc --make list-names.hs
		&gt;$ ./list-names
		&gt;:1.0
		&gt;:1.1
		&gt;:1.10
		&gt;:1.106
		&gt;:1.109
		&gt;:1.110
		&gt;ca.desrt.dconf
		&gt;org.freedesktop.DBus
		&gt;org.freedesktop.Notifications
		&gt;org.freedesktop.secrets
		&gt;org.gnome.ScreenSaver
	</longdescription>
</pkgmetadata>