lain/widgets/alsabar.lua

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

local newtimer     = require("lain.helpers").newtimer
local read_pipe    = require("lain.helpers").read_pipe

local awful        = require("awful")
local beautiful    = require("beautiful")
local naughty      = require("naughty")
local wibox        = require("wibox")

local math         = { modf   = math.modf }
local string       = { format = string.format,
                       match  = string.match,
                       rep    = string.rep }
local tonumber     = tonumber

local setmetatable = setmetatable

-- ALSA volume bar
-- lain.widgets.alsabar
local alsabar = {
    channel = "Master",
    step    = "1%",

    colors = {
        background = beautiful.bg_normal,
        mute       = "#EB8F8F",
        unmute     = "#A4CE8A"
    },

    terminal = terminal or "xterm",
    mixer    = string.format("%s -e alsamixer", terminal),

    notifications = {
        font      = beautiful.font:sub(beautiful.font:find(""), beautiful.font:find(" ")),
        font_size = "11",
        color     = beautiful.fg_normal,
        screen    = 1
    },

    _current_level = 0,
    _muted         = false
}

function alsabar.notify()
    alsabar.update()

    local preset = {
        title   = "",
        text    = "",
        timeout = 5,
        screen  = alsabar.notifications.screen,
        font    = string.format("%s %s", alsabar.notifications.font,
                  alsabar.notifications.font_size),
        fg      = alsabar.notifications.color
    }

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

    int = math.modf((alsabar._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 alsabar.followtag then
        preset.screen = awful.screen.focused()
    end

    if alsabar._notify ~= nil then
        alsabar._notify = naughty.notify ({
            replaces_id = alsabar._notify.id,
            preset      = preset,
        })
    else
        alsabar._notify = naughty.notify ({
            preset = preset,
        })
    end
end

local function worker(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 vertical     = args.vertical or false

    alsabar.cmd           = args.cmd or "amixer"
    alsabar.channel       = args.channel or alsabar.channel
    alsabar.togglechannel = args.togglechannel
    alsabar.step          = args.step or alsabar.step
    alsabar.colors        = args.colors or alsabar.colors
    alsabar.notifications = args.notifications or alsabar.notifications
    alsabar.followtag     = args.followtag or false

    alsabar.bar = wibox.widget {
        forced_height    = height,
        forced_width     = width,
        color            = alsabar.colors.unmute,
        background_color = alsabar.colors.background,
        margins          = 1,
        paddings         = 1,
        ticks            = ticks,
        ticks_size       = ticks_size,
        widget           = wibox.widget.progressbar,
        layout           = vertical and wibox.container.rotate
    }

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

    function alsabar.update()
        -- Get mixer control contents
        local mixer = read_pipe(string.format("%s get %s", alsabar.cmd, alsabar.channel))

        -- Capture mixer control state:          [5%] ... ... [on]
        local volu, mute = string.match(mixer, "([%d]+)%%.*%[([%l]*)")

        -- HDMIs can have a channel different from Master for toggling mute
        if alsabar.togglechannel then
            mute = string.match(read_pipe(string.format("%s get %s", alsabar.cmd, alsabar.togglechannel)), "%[(%a+)%]")
        end

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

            volume_now = {}
            volume_now.level = tonumber(volu)
            volume_now.status = mute

            settings()
        end
    end

    alsabar.bar:buttons(awful.util.table.join (
          awful.button({}, 1, function()
            awful.util.spawn(alsabar.mixer)
          end),
          awful.button({}, 2, function()
						awful.util.spawn(string.format("%s set %s 100%%", alsabar.cmd, alsabar.channel))
            pulsebar.update()
          end),
          awful.button({}, 3, function()
            awful.util.spawn(string.format("%s set %s toggle", alsabar.cmd, alsabar.togglechannel or alsabar.channel))
            alsabar.update()
          end),
          awful.button({}, 4, function()
            awful.util.spawn(string.format("%s set %s %s+", alsabar.cmd, alsabar.channel, alsabar.step))
            alsabar.update()
          end),
          awful.button({}, 5, function()
            awful.util.spawn(string.format("%s set %s %s-", alsabar.cmd, alsabar.channel, alsabar.step))
            alsabar.update()
          end)
    ))

    timer_id = string.format("alsabar-%s-%s", alsabar.cmd, alsabar.channel)

    newtimer(timer_id, timeout, alsabar.update)

    return alsabar
end

return setmetatable(alsabar, { __call = function(_, ...) return worker(...) end })