wmtools/brightness.nim

import std/os
import strutils
import std/osproc
import std/math
import base

proc getLimit(): int

let limit = getLimit()

proc getLimit(): int =
  let limit = parseInt(strip(readFile("/sys/class/backlight/intel_backlight/max_brightness")))
  return limit

proc getDesign(pcnt: float): string =
  var icon = "🌑"
  case pcnt:
    of 85..100:
      icon = "🌕"
    of 75..85:
      icon = "🌖"
    of 50..75:
      icon = "🌗"
    of 35..50:
      icon = "🌘"
    else:
      icon = "🌑"
  let percent = toInt(round(pcnt,0))
  let text = icon & " " & $percent & "%"
  return text

proc get_brightness*(run_once: bool = false) =
  var last_pcnt: float = 0
  while true:
    let current = parseInt(strip(readFile("/sys/class/backlight/intel_backlight/actual_brightness")))
    let pcnt = (current/limit)*100
    if pcnt != last_pcnt:
      let text = getDesign(pcnt)
      var data = newInfo()
      data.title = "Brightness : "
      data.full_text = text
      data.border = yellow
      data.selected_background = yellow
      data.selected_color = black
      let args = @["up", "down"]
      let option = outputJSON(data,args)
      if option in args:
        case option:
          of "up":
            discard execCmd("xbacklight -inc 5")
            get_brightness(true)
          of "down":
            discard execCmd("xbacklight -dec 5")
            get_brightness(true)
      else:
        try:
          let i = parseInt(option)
          discard execCmd("xbacklight -set " & $i)
          get_brightness(true)
        except:
          echo getCurrentExceptionMsg()

      if run_once:
        break
    if stoploop:
      break
    last_pcnt = pcnt
    sleep(1000)

proc main() =
  get_brightness()

if isMainModule:
  main()