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lain.widgets -> lain.widget
[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 local setmetatable = setmetatable
12
13 -- Template for asynchronous watcher widgets
14 -- lain.widget.watch
15
16 local function worker(args)
17     local watch     = {}
18     local args      = args or {}
19     local timeout   = args.timeout or 5
20     local nostart   = args.nostart or false
21     local stoppable = args.stoppable or false
22     local cmd       = args.cmd
23     local settings  = args.settings or function() widget:set_text(output) end
24
25     watch.widget = args.widget or textbox()
26
27     function watch.update()
28         helpers.async(cmd, function(f)
29             output = f
30             if output ~= watch.prev then
31                 widget = watch.widget
32                 settings()
33                 watch.prev = output
34             end
35         end)
36     end
37
38     watch.timer = helpers.newtimer(cmd, timeout, watch.update, nostart, stoppable)
39
40     return watch
41 end
42
43 return setmetatable({}, { __call = function(_, ...) return worker(...) end })