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36118b8a3cd31031c5786aba975059d137190f9f
[etc/awesome.git] / widget / watch.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5       * (c) 2014, Luke Bonham                     
6                                                   
7 --]]
8
9 local helpers = require("lain.helpers")
10 local textbox = require("wibox.widget.textbox")
11
12 -- Template for asynchronous watcher widgets
13 -- lain.widget.watch
14
15 local function factory(args)
16     local watch     = { widget = args.widget or textbox() }
17     local args      = args or {}
18     local timeout   = args.timeout or 5
19     local nostart   = args.nostart or false
20     local stoppable = args.stoppable or false
21     local cmd       = args.cmd
22     local settings  = args.settings or function() widget:set_text(output) end
23
24     function watch.update()
25         helpers.async(cmd, function(f)
26             output = f
27             if output ~= watch.prev then
28                 widget = watch.widget
29                 settings()
30                 watch.prev = output
31             end
32         end)
33     end
34
35     watch.timer = helpers.newtimer(cmd, timeout, watch.update, nostart, stoppable)
36
37     return watch
38 end
39
40 return factory