Writing sublets\015\012\015\012{{>toc}}\015\012\015\012Starting a sublet from scratch is really easy, just create an empty sublet either with sur like sur template foo or with any editor of your choice. A sublet has some base functions and can access subtle itself via subtlext. A compending list of the classes with it's functionality can be found in rdoc and informations about the available unit tests in the hacking section.\015\012\015\012h3. Types\015\012\015\012Generally there are two different types of Sublets:\015\012\015\012* sublets that are updated by given interval in seconds (default 60s)\015\012* sublets that are updated when a file is modified (via inotify) or via socket\015\012\015\012The sublet data must be of type String, everything else will be ignored.\015\012\015\012h3. Events\015\012\015\012Sublets are event driven, so there are some specific events only for sublets and it's also possible to use any existing hook.\015\012\015\012*Specific events:*\015\012\015\012| :mouse_over | Whenever the pointer is over the sublet |\015\012| :mouse_down | Whenever the pointer is pressed on the sublet. Can have three arguments: x, y, button. |\015\012| :mouse_out | Whenever the pointer leaves the sublet |\015\012| :run | Whenever either the interval time is expired |\015\012| :unload | Whenever the sublet is unloaded |\015\012| :watch | Whenever the watched file is modified/socket has data ready |\015\012\015\012h3. Grabs\015\012\015\012Since r2204 sublets can use grabs in a similar way as in the main config. \015\012\015\012

{{hide}}\015\012configure :grabby do |s|\015\012  s.interval = 5\015\012end\015\012\015\012grab "A-b" do |s, c|\015\012  puts "sublet name: %s" % [ s.name ]\015\012  puts "pressed on : %s" % [ c.name ]\015\012end\015\012

\015\012\015\012_Please note that there is no checking if the newly created grab already exists, last one wins._\015\012\015\012h3. Configuration\015\012\015\012Sublets can either be configured by editing the sublet file or by a special DSL command in the main config (since r2148) of subtle. The latter done via Subtle::Subtle#config, this returns a hash and can be used as in the following example:\015\012\015\012h4. Inside of the config\015\012\015\012

{{hide}}sublet :configured do\015\012  interval    50\015\012  some_string "#00ff00"\015\012end

\015\012\015\012h4. Inside of the sublet\015\012\015\012

{{hide}}configure :configured do |s|\015\012  s.interval    = s.config[:interval]    || 30\015\012  s.some_string = s.config[:some_string] || "default"\015\012\015\012  # Works with colors too\015\012  s.red = Subtlext::Color.new(s.config[:red] || "#ff0000")\015\012end\015\012\015\012on :run do\015\012  s.data = s.red + s.some_string\015\012end

\015\012\015\012h3. Customization\015\012\015\012The color of the ouput of a Sublets can be changed in this way:\015\012\015\012

{{hide}}configure :colorful do |s|\015\012  s.red        = Subtlext::Color.new("#ff0000")\015\012  s.green      = Subtlext::Color.new("#00ff00")\015\012  s.blue       = Subtlext::Color.new("#0000ff")\015\012  s.background = "#303030"\015\012end\015\012\015\012on :run do\015\012  s.data = s.red + "su" + s.green + "bt" + s.blue + "le"\015\012end

\015\012\015\012There is also a way to add a X bitmap to a sublet:\015\012\015\012

{{hide}}configure :iconized do |s|\015\012  s.icon = Subtlext::Icon.new("/usr/share/icons/subtle.xbm")\015\012end\015\012\015\012on :run do |s|\015\012  s.data = @icon + "subtle"\015\012end

\015\012\015\012A nice collection of this pixmap can be found Subtle" class="external">here</a> will add a padding of 3px left and right of the pixmap, so keep that in mind when using the click hooks._\015\012\015\012h3. Examples\015\012\015\012Below is the code of a shipped sublets that displays the time. It should be really straight forward:\015\012\015\012

{{hide}}configure :clock do |s|\015\012  s.interval = 60 #< Set interval time\015\012end\015\012\015\012on :run do |s|\015\012  s.data = Time.now.strftime("%d%m%y%H%M") #< Set data\015\012end

\015\012\015\012Another example for the inotify sublet which is also included within subtle:\015\012\015\012

{{hide}}configure :notify do |s|\015\012  s.file = "/tmp/watch"\015\012  s.watch(s.file)\015\012end\015\012\015\012on :run do\015\012  begin\015\012    self.data = IO.readlines(@file).first.chop #< Read data and strip\015\012  rescue => err #< Catch error\015\012    puts err\015\012    self.data = "subtle"\015\012  end\015\012end

\015\012\015\012The watch command also works with Ruby sockets, but be aware of blocking I/O:\015\012\015\012

{{hide}}configure :socket do |s|\015\012  s.socket = TCPSocket.open("localhost", 6600)\015\012  s.watch(s.socket)\015\012end\015\012\015\012on :watch do |s|\015\012  begin\015\012    s.data = s.socket.readline.chop #< Read data and strip\015\012  rescue => err #< Catch error\015\012    puts err\015\012    s.data = "subtle"\015\012  end\015\012end\015\012\015\012on :run do |s|\015\012  #  Do nothing\015\012end

\015\012\015\012_Subtle will automatically set sockets to O_NONBLOCK._\015\012\015\012And finally an example with a click callback:\015\012\015\012

{{hide}}configure :click do |s|\015\012  s.interval = 999 #< Do nothing\015\012end\015\012\015\012on :mouse_down do |s, x, y, button|\015\012  Subtlext::Client["xterm"].raise\015\012  puts x, y, button\015\012end\015\012\015\012on :run do |s|\015\012  # Do nothing here\015\012end

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