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[etc/awesome.git] / widgets / 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.widgets.contrib.kblayout
19 local kbdlayout = {}
20
21 local function worker(args)
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    kbdlayout.widget = wibox.widget.textbox()
32
33    local function kbd_run_settings(layout, variant)
34       kbdlayout_now = {
35           layout  = string.match(layout, "[^,]+"), -- Make sure to match the primary layout only.
36           variant = variant
37       }
38       widget = kbdlayout.widget
39       settings()
40    end
41
42    function kbdlayout.update()
43       helpers.async("setxkbmap -query", function(status)
44           kbd_run_settings(string.match(status, "layout:%s*([^\n]*)"),
45           string.match(status, "variant:%s*([^\n]*)"))
46       end)
47    end
48
49    function kbdlayout.set(i)
50       if #layouts == 0 then return end
51       idx = ((i - 1) % #layouts) + 1 -- Make sure to wrap around as needed.
52       local to_execute = "setxkbmap " .. layouts[idx].layout
53
54       if add_us_secondary and not string.match(layouts[idx].layout, ",?us,?") then
55          to_execute = to_execute .. ",us"
56       end
57
58       if layouts[idx].variant then
59          to_execute = to_execute .. " " .. layouts[idx].variant
60       end
61
62       if execute(to_execute) then
63          kbd_run_settings(layouts[idx].layout, layouts[idx].variant)
64       end
65    end
66
67    function kbdlayout.next() kbdlayout.set(idx + 1) end
68    function kbdlayout.prev() kbdlayout.set(idx - 1) end
69
70    -- Mouse bindings
71    kbdlayout.widget:buttons(awful.util.table.join(
72                               awful.button({ }, 1, function () kbdlayout.next() end),
73                               awful.button({ }, 3, function () kbdlayout.prev() end)))
74
75    helpers.newtimer("kbdlayout", timeout, kbdlayout.update)
76
77    return kbdlayout
78 end
79
80 return setmetatable({}, { __call = function (_, ...) return worker(...) end })