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Fixed initial state where alsa.update may never be called
[etc/awesome.git] / widgets / base.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5       * (c) 2014, Luke Bonham                     
6                                                   
7 --]]
8
9 local newtimer     = require("lain.helpers").newtimer
10 local read_pipe    = require("lain.helpers").read_pipe
11
12 local wibox        = require("wibox")
13
14 local setmetatable = setmetatable
15
16 -- Basic template for custom widgets
17 -- lain.widgets.base
18
19 local function worker(args)
20     local base     = {}
21     local args     = args or {}
22     local timeout  = args.timeout or 5
23     local cmd      = args.cmd or ""
24     local settings = args.settings or function() end
25
26     base.widget = wibox.widget.textbox('')
27
28     function base.update()
29         if output ~= abase.prev then
30             output = read_pipe(cmd)
31             widget = base.widget
32             settings()
33             abase.prev = output
34         end
35     end
36
37     newtimer(cmd, timeout, base.update)
38
39     return setmetatable(base, { __index = base.widget })
40 end
41
42 return setmetatable({}, { __call = function(_, ...) return worker(...) end })