brightnessarc widget

brightnessarc-widget/README.md

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+# Brightness widget
+
+![Brightness widget](./br-wid-1.png)
+
+This widget represents current brightness level.
+
+## Installation
+
+Firstly you need to get the current brightness level. There are two options:
+
+ - using `xbacklight` command (depending on your video card (I guess) it may or may not work)
+ 
+    To check if it works install xbackligth and check if it works:
+ 
+    ```bash
+    sudo apt-get install xbacklight
+    xbacklight -get
+    ```
+
+    If there is no output it means that it doesn't work, but there is a second option:
+
+ - using `light` command
+ 
+    Install it from this git repo: [github.com/haikarainen/light](https://github.com/haikarainen/light) and check if it works but running
+
+    ```bash
+    git clone https://github.com/haikarainen/light.git && \
+    cd ./light && \
+    sudo make && sudo make install \
+    light -G
+    49.18
+    ```
+Depending on the chosen option change `GET_BRIGHTNESS_CMD` variable in **brightness.lua**.
+
+Then in **rc.lua** add the import on top of the file and then add widget to the wibox:
+
+```lua
+require("awesome-wm-widgets.brightness-widget.brightness")
+...
+-- Add widgets to the wibox
+s.mywibox:setup {
+...
+{ -- Right widgets
+...
+brightness_widget
+```
+
+## Controls
+
+In order to change brightness by shortcuts you can add them to the `globalkeys` table in the **rc.lua**:
+
+```lua
+awful.key({ modkey         }, ";", function () awful.spawn("light -A 5") end, {description = "increase brightness", group = "custom"}),
+awful.key({ modkey, "Shift"}, ";", function () awful.spawn("light -U 5") end, {description = "decrease brightness", group = "custom"}),
+```
+On laptop you can use `XF86MonBrightnessUp` and `XF86MonBrightnessDown` keys.

brightnessarc-widget/brightnessarc.lua

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+-------------------------------------------------
+-- Brightness Widget for Awesome Window Manager
+-- Shows the brightness level of the laptop display
+-- More details could be found here:
+-- https://github.com/streetturtle/awesome-wm-widgets/tree/master/brightness-widget
+
+-- @author Pavel Makhov
+-- @copyright 2017 Pavel Makhov
+-------------------------------------------------
+
+local wibox = require("wibox")
+local watch = require("awful.widget.watch")
+local spawn = require("awful.spawn")
+local naughty = require("naughty")
+
+local PATH_TO_ICON = "/usr/share/icons/Arc/status/symbolic/display-brightness-symbolic.svg"
+local GET_BRIGHTNESS_CMD = "light -G"   -- "xbacklight -get"
+local INC_BRIGHTNESS_CMD = "light -A 5" -- "xbacklight -inc 5"
+local DEC_BRIGHTNESS_CMD = "light -U 5" -- "xbacklight -dec 5"
+
+local icon = {
+    id = "icon",
+    image = PATH_TO_ICON,
+    resize = true,
+    widget = wibox.widget.imagebox,
+}
+
+local brightnessarc = wibox.widget {
+    icon,
+    max_value = 1,
+    thickness = 2,
+    start_angle = 4.71238898, -- 2pi*3/4
+    forced_height = 18,
+    forced_width = 18,
+    bg = "#ffffff11",
+    paddings = 2,
+    widget = wibox.container.arcchart
+}
+
+local brightnessarc_widget = wibox.container.mirror(brightnessarc, { horizontal = true })
+
+local update_widget = function(widget, stdout, stderr, exitreason, exitcode)
+    local brightness_level = string.match(stdout, "(%d?%d?)")
+    brightness_level = tonumber(string.format("% 3d", brightness_level))
+
+    widget.value = brightness_level / 100;
+end,
+
+brightnessarc:connect_signal("button::press", function(_,_,_,button)
+    if (button == 4)     then spawn(INC_BRIGHTNESS_CMD, false)
+    elseif (button == 5) then spawn(DEC_BRIGHTNESS_CMD, false)
+    end
+end)
+
+watch(GET_BRIGHTNESS_CMD, 1, update_widget, brightnessarc)
+
+return brightnessarc_widget