Project

General

Profile

Sublets » History » Version 50

« Previous - Version 50/66 (diff) - Next » - Current version
Anonymous, 09/26/2010 02:43 AM


Sublets\015\012\015\012{{>toc}}\015\012\015\012Sublets are small Ruby scripts written in a small DSL that can provide things like system information for the panel. They are well included in the main loop of subtle and can be used in various ways. \015\012\015\012h2. Installation\015\012\015\012h3. Easy\015\012\015\012The easiest way to install a sublet is to let sur do all the dirty work, it's designed to be really easy and works in a rubygems":http://www.rubygems.org like fashion. Generally sur is the subtle user repository for user contributed sublets, everyone can submit sublets via sur.\015\012\015\012
\015\012sur install clock\015\012sur uninstall clock\015\012sur notes clock\015\012
\015\012\015\012h3. Hard\015\012\015\012Ok, you asked for it: Point your browser to http://sur.subforge.org/ and download a sublet. Then you need to unpack the sublet - they are just tarballs. Once unpacked you will probably find three types of files:\015\012\015\012# A sublet file (.rb) [$XDG_DATA_HOME/subtle/sublets]\015\012# A specification file (.spec) [$XDG_DATA_HOME/subtle/specifications]\015\012# Zero or more icons (.xbm) [$XDG_DATA_HOME/subtle/icons]\015\012\015\012The files need to be installed in the appropriate folders in $XDG_DATA_HOME/subtle and after a reload of either the configor the sublets you are done.\015\012\015\012h2. Configuration\015\012\015\012Many sublets can be configured by editing the sublet file itself, which can be troublesome for users not that in love with ruby. In case the sublet supports the newer way (since r2148) there is a special DSL command for this:\015\012\015\012
{{hide}}sublet :clock do\015\012  interval      50\015\012  format_string "%H:%S"\015\012end
\015\012\015\012h2. Writing\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 will be unloaded |\015\012| :watch | Whenever the watched file is modified/socket has data ready |\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. This is done via Subtle::Subtle#config, which returns a hash
{{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