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widgets: no global tables, but one instance per call; closes #336; closes #337
[etc/awesome.git] / widget / contrib / kbdlayout.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5       * (c) 2015, Dario Gjorgjevski               
6                                                   
7 --]]
8
9 local helpers      = require("lain.helpers")
10 local awful        = require("awful")
11 local wibox        = require("wibox")
12 local string       = { format = string.format,
13                        match  = string.match }
14 local execute      = os.execute
15 local setmetatable = setmetatable
16
17 -- Keyboard layout switcher
18 -- lain.widget.contrib.kblayout
19
20 local function factory(args)
21     local kbdlayout        = { widget = wibox.widget.textbox() }
22     local args             = args or {}
23     local layouts          = args.layouts or {}
24     local settings         = args.settings or function () end
25     local add_us_secondary = true
26     local timeout          = args.timeout or 5
27     local idx              = 1
28
29     if args.add_us_secondary == false then add_us_secondary = false end
30
31     local function kbd_run_settings(layout, variant)
32         kbdlayout_now = {
33             layout  = string.match(layout, "[^,]+"), -- Make sure to match the primary layout only.
34             variant = variant
35         }
36         widget = kbdlayout.widget
37         settings()
38     end
39
40     function kbdlayout.update()
41         helpers.async("setxkbmap -query", function(status)
42             kbd_run_settings(string.match(status, "layout:%s*([^\n]*)"),
43             string.match(status, "variant:%s*([^\n]*)"))
44         end)
45     end
46
47     function kbdlayout.set(i)
48         if #layouts == 0 then return end
49         idx = ((i - 1) % #layouts) + 1 -- Make sure to wrap around as needed.
50         local to_execute = "setxkbmap " .. layouts[idx].layout
51
52         if add_us_secondary and not string.match(layouts[idx].layout, ",?us,?") then
53             to_execute = to_execute .. ",us"
54         end
55
56         if layouts[idx].variant then
57             to_execute = to_execute .. " " .. layouts[idx].variant
58         end
59
60         if execute(to_execute) then
61             kbd_run_settings(layouts[idx].layout, layouts[idx].variant)
62         end
63    end
64
65    function kbdlayout.next() kbdlayout.set(idx + 1) end
66    function kbdlayout.prev() kbdlayout.set(idx - 1) end
67
68    -- Mouse bindings
69    kbdlayout.widget:buttons(awful.util.table.join(
70                               awful.button({ }, 1, function () kbdlayout.next() end),
71                               awful.button({ }, 3, function () kbdlayout.prev() end)))
72
73    helpers.newtimer("kbdlayout", timeout, kbdlayout.update)
74
75    return kbdlayout
76 end
77
78 return factory