lain/widget/pulsebar.lua

--[[
                                                  
     Licensed under GNU General Public License v2 
      * (c) 2013, Luke Bonham                     
      * (c) 2013, Rman                            
                                                  
--]]

local helpers      = require("lain.helpers")
local awful        = require("awful")
local naughty      = require("naughty")
local wibox        = require("wibox")
local math         = { modf   = math.modf }
local string       = { format = string.format,
                       gmatch = string.gmatch,
                       match  = string.match,
                       rep    = string.rep }
local type         = type
local tonumber     = tonumber
local setmetatable = setmetatable

-- Pulseaudio volume bar
-- lain.widget.pulsebar
local pulsebar = {
    colors = {
        background = "#000000",
        mute       = "#EB8F8F",
        unmute     = "#A4CE8A"
    },

    _current_level = 0,
    _muted         = false
}

local function factory(args)
    local args       = args or {}
    local timeout    = args.timeout or 5
    local settings   = args.settings or function() end
    local width      = args.width or 63
    local height     = args.heigth or 1
    local ticks      = args.ticks or false
    local ticks_size = args.ticks_size or 7
    local scallback  = args.scallback

    pulsebar.cmd           = args.cmd or "pacmd list-sinks | sed -n -e '0,/*/d' -e '/base volume/d' -e '/volume:/p' -e '/muted:/p' -e '/device\\.string/p'"
    pulsebar.sink          = args.sink or 0
    pulsebar.colors        = args.colors or pulsebar.colors
    pulsebar.followtag     = args.followtag or false
    pulsebar.notifications = args.notification_preset
    pulsebar.device        = "N/A"

    if not pulsebar.notification_preset then
        pulsebar.notification_preset      = {}
        pulsebar.notification_preset.font = "Monospace 10"
    end

    pulsebar.bar = wibox.widget {
        forced_height    = height,
        forced_width     = width,
        color            = pulsebar.colors.unmute,
        background_color = pulsebar.colors.background,
        margins          = 1,
        paddings         = 1,
        ticks            = ticks,
        ticks_size       = ticks_size,
        widget           = wibox.widget.progressbar,
    }

    pulsebar.tooltip = awful.tooltip({ objects = { pulsebar.bar } })

    function pulsebar.update(callback)
        if scallback then pulsebar.cmd = scallback() end

        helpers.async({ awful.util.shell, "-c", pulsebar.cmd }, function(s)
            volume_now = {
                index = string.match(s, "index: (%S+)") or "N/A",
                sink  = string.match(s, "device.string = \"(%S+)\"") or "N/A",
                muted = string.match(s, "muted: (%S+)") or "N/A"
            }

            pulsebar.device = volume_now.index

            local ch = 1
            volume_now.channel = {}
            for v in string.gmatch(s, ":.-(%d+)%%") do
              volume_now.channel[ch] = v
              ch = ch + 1
            end

            volume_now.left  = volume_now.channel[1] or "N/A"
            volume_now.right = volume_now.channel[2] or "N/A"

            local volu = volume_now.left
            local mute = volume_now.muted

            if (volu and volu ~= pulsebar._current_level) or (mute and mute ~= pulsebar._muted) then
                pulsebar._current_level = volu
                pulsebar.bar:set_value(pulsebar._current_level / 100)
                if (not mute and volu == 0) or mute == "yes" then
                    pulsebar._muted = true
                    pulsebar.tooltip:set_text ("[Muted]")
                    pulsebar.bar.color = pulsebar.colors.mute
                else
                    pulsebar._muted = false
                    pulsebar.tooltip:set_text(string.format("%s: %s", pulsebar.sink, volu))
                    pulsebar.bar.color = pulsebar.colors.unmute
                end

                settings()

                if type(callback) == "function" then callback() end
            end
        end)
    end

    function pulsebar.notify()
        pulsebar.update(function()
            local preset = pulsebar.notification_preset

            if pulsebar._muted then
                preset.title = string.format("Sink %s - Muted", pulsebar.sink)
            else
                preset.title = string.format("%s - %s%%", pulsebar.sink, pulsebar._current_level)
            end

            int = math.modf((pulsebar._current_level / 100) * awful.screen.focused().mywibox.height)
            preset.text = string.format("[%s%s]", string.rep("|", int),
                          string.rep(" ", awful.screen.focused().mywibox.height - int))

            if pulsebar.followtag then preset.screen = awful.screen.focused() end

            if not pulsebar.notification then
                pulsebar.notification = naughty.notify {
                    preset  = preset,
                    destroy = function() pulsebar.notification = nil end
                }
            else
                naughty.replace_text(pulsebar.notification, preset.title, preset.text)
            end
        end)
    end

    helpers.newtimer(string.format("pulsebar-%s", pulsebar.sink), timeout, pulsebar.update)

    return pulsebar
end

return setmetatable(pulsebar, { __call = function(_, ...) return factory(...) end })