5 files changed, 290 insertions, 0 deletions
diff --git a/pkgs/util/default.nix b/pkgs/util/default.nix
new file mode 100644
index 0000000..9dbe067
--- /dev/null
+++ b/pkgs/util/default.nix
@@ -0,0 +1,44 @@
+{pkgs ? import <nixpkgs> {system = "x86_64-linux";}, ...}: let
+  lsdbus-src = pkgs.fetchFromGitHub {
+    owner = "kmarkus";
+    repo = "lsdbus";
+    rev = "6f80930248110927d1f898966544eec202ea3550";
+    hash = "sha256-N/VCjrI7RolHV0ya1U+YTLGAWv8+WNz2nobaGxdR1wQ=";
+  };
+
+  lsdbus = pkgs.stdenv.mkDerivation {
+    pname = "lsdbus";
+    version = "scm-3";
+    src = lsdbus-src;
+    nativeBuildInputs = with pkgs; [cmake gnumake pkg-config systemdLibs minixml lua5_4];
+    cmakeFlags = ["-DCONFIG_LUA_VER=5.4"];
+  };
+
+  lua =
+    pkgs.runCommand "lua-env" {
+      buildInputs = with pkgs; [lua5_4];
+      nativeBuildInputs = [pkgs.makeWrapper];
+    } ''
+      mkdir -p $out/bin
+      install -D -m 755 ${pkgs.lua5_4}/bin/lua $out/bin/lua
+      wrapProgram $out/bin/lua \
+        --prefix LUA_PATH \; '?.lua;?/init.lua' \
+        --prefix LUA_PATH \; '${lsdbus}/share/lua/5.4/?.lua' \
+        --prefix LUA_PATH \; '${lsdbus}/share/lua/5.4/?/init.lua' \
+        --prefix LUA_CPATH \; '${lsdbus}/lib/lua/5.4/?.so'
+    '';
+in
+  pkgs.stdenv.mkDerivation {
+    pname = "util.lua";
+    version = "1.0.0";
+    src = ./.;
+    buildInputs = [pkgs.brightnessctl];
+    nativeBuildInputs = [pkgs.makeWrapper];
+
+    buildPhase = ''
+      mkdir -p $out/{bin,lib}
+      substitute $src/util.lua $out/bin/util.lua --replace-fail @lua@ ${lua} --replace-fail @out@ $out
+      cp -r $src/util $out/lib/util
+      chmod +x $out/bin/util.lua
+    '';
+  }
diff --git a/pkgs/util/util.lua b/pkgs/util/util.lua
new file mode 100644
index 0000000..ade7019
--- /dev/null
+++ b/pkgs/util/util.lua
@@ -0,0 +1,35 @@
+#!@lua@/bin/lua
+local lsdbus = require("lsdbus")
+
+local music = dofile"@out@/lib/util/music.lua"
+local brightness = dofile"@out@/lib/util/brightness.lua"
+local volume = dofile"@out@/lib/util/volume.lua"
+
+local b = lsdbus.open()
+local s = lsdbus.open("system")
+
+if arg[1] == "music" then
+  if arg[2] == "toggle" then
+    music.toggle_play(b)
+  elseif arg[2] == "next" then
+    music.next_song(b)
+  elseif arg[2] == "prev" then
+    music.prev_song(b)
+  end
+elseif arg[1] == "brightness" then
+  if arg[2] == "up" then
+    brightness.brightness_up(s)
+  elseif arg[2] == "down" then
+    brightness.brightness_down(s)
+  else
+    error(("arg[2] '%s' incorrect format. Should be `up` or `down`"):format(tostring(arg[2])))
+  end
+elseif arg[1] == "volume" then
+  if arg[2] == "up" then
+    volume.volume_up()
+  elseif arg[2] == "down" then
+    volume.volume_down()
+  else
+    error(("arg[2] '%s' incorrect format. Should be `up` or `down`"):format(tostring(arg[2])))
+  end
+end
diff --git a/pkgs/util/util/brightness.lua b/pkgs/util/util/brightness.lua
new file mode 100644
index 0000000..13a7974
--- /dev/null
+++ b/pkgs/util/util/brightness.lua
@@ -0,0 +1,40 @@
+local lsdbus = require("lsdbus")
+
+local function get_brightness()
+  local proc = io.open("/sys/class/backlight/intel_backlight/brightness")
+  local cur_brightness = tonumber(proc:read("*l"))
+  return cur_brightness
+end
+
+local function get_max_brightness()
+  local proc = io.open("/sys/class/backlight/intel_backlight/max_brightness")
+  local max_brightness = tonumber(proc:read("*l"))
+  return max_brightness
+end
+
+local function notify_brightness()
+  local brightness_percent = math.floor((get_brightness() / get_max_brightness()) * 100)
+  os.execute(string.format(
+    "dunstify -t 2000 -h string:x-canonical-private-synchronous:brightness 'Brightness' -h int:value:%d",
+    brightness_percent
+  ))
+end
+
+local M = {}
+
+function set_brightness(s, brightness)
+  local brightness_proxy = lsdbus.proxy.new(s, 'org.freedesktop.login1', '/org/freedesktop/login1/session/1', "org.freedesktop.login1.Session")
+  brightness_proxy("SetBrightness", "backlight", "intel_backlight", brightness)
+end
+
+function M.brightness_down(s, brightness)
+  set_brightness(s, get_brightness() - 5*(get_max_brightness() / 100))
+  notify_brightness()
+end
+
+function M.brightness_up(s, brightness)
+  set_brightness(s, get_brightness() + 5*(get_max_brightness() / 100))
+  notify_brightness()
+end
+
+return M
diff --git a/pkgs/util/util/music.lua b/pkgs/util/util/music.lua
new file mode 100644
index 0000000..c9dd726
--- /dev/null
+++ b/pkgs/util/util/music.lua
@@ -0,0 +1,124 @@
+local lsdbus = require("lsdbus")
+
+function list_players(b)
+  local dbus = lsdbus.proxy.new(b,
+    'org.freedesktop.DBus',
+    '/org/freedesktop/DBus',
+    'org.freedesktop.DBus'
+  )
+  local all_services = dbus("ListNames")
+
+  local players = {}
+  for _, name in ipairs(all_services) do
+    if name:match("^org.mpris.MediaPlayer2") then
+      table.insert(players, name)
+    end
+  end
+  return players
+end
+
+local function get_player_proxy(b, player)
+  local ok, res = pcall(function() return lsdbus.proxy.new(b,
+    player,
+    '/org/mpris/MediaPlayer2',
+    'org.mpris.MediaPlayer2.Player'
+  ) end)
+  if ok then
+    return res
+  end
+end
+
+local function list_playing_players(b)
+  local playing = {}
+  for _, player in ipairs(list_players(b)) do
+    local proxy = get_player_proxy(b, player)
+    if proxy and proxy.PlaybackStatus == "Playing" then
+      -- print(player)
+      table.insert(playing, player)
+    end
+  end
+  return playing
+end
+
+local function solo_player(b, player)
+  for _, i in list_playing_players(b) do
+    if i ~= player then
+      get_player_proxy(b, player)"Pause"
+    end
+  end
+end
+
+local STATE_FILE = os.getenv("HOME") .. "/.local/state/music_player_paused"
+local function write_state(state_file, player)
+  local f, _ = io.open(state_file, "w")
+  f:write(player.."\n")
+  f:close()
+end
+
+local function read_state(state_file)
+  local f, _ = io.open(state_file, "r")
+  local read = f:read("*l")
+  f:close()
+  return read
+end
+
+local M = {}
+
+local function notify_music(b, player)
+  local player_proxy = lsdbus.proxy.new(b, player, '/org/mpris/MediaPlayer2', 'org.mpris.MediaPlayer2.Player')
+  local meta = player_proxy.Metadata
+
+  os.execute(string.format(
+    "dunstify -t 2000 -h string:x-canonical-private-synchronous:music -i '%s' '%s' '%s' -h int:value:%d",
+    meta["mpris:artUrl"] or "",
+    player_proxy.PlaybackStatus .. " " .. meta["xesam:title"] or "",
+    "by " .. meta["xesam:artist"][1],
+    math.floor(player_proxy.Position / meta["mpris:length"])
+  ))
+end
+
+function M.toggle_play(b)
+  local current_playing = list_playing_players(b)
+  local state = read_state(STATE_FILE)
+
+  if #current_playing == 0 and state ~= "" then
+    local p = get_player_proxy(b, state)
+    if p then
+      p("Play")
+      notify_music(b, state)
+    end
+    return
+  end
+
+  if #current_playing == 1 then
+    local c = current_playing[1]
+    write_state(STATE_FILE, c)
+    get_player_proxy(b, c)("Pause")
+    notify_music(b, c)
+    return
+  end
+
+  if #current_playing > 1 then
+    for _, player in ipairs(current_playing) do
+      get_player_proxy(b, player)"Pause"
+    end
+  end
+end
+
+function M.next_song(b)
+  local currently_playing = list_playing_players(b)
+  if #currently_playing ~= 0 then
+    local player_proxy = lsdbus.proxy.new(b, currently_playing[1], '/org/mpris/MediaPlayer2', 'org.mpris.MediaPlayer2.Player')
+    player_proxy("Next")
+  end
+end
+
+function M.prev_song(b)
+  local currently_playing = list_playing_players(b)
+  if #currently_playing ~= 0 then
+    local player_proxy = lsdbus.proxy.new(b, currently_playing[1], '/org/mpris/MediaPlayer2', 'org.mpris.MediaPlayer2.Player')
+    player_proxy("Previous")
+  end
+end
+
+return M
diff --git a/pkgs/util/util/volume.lua b/pkgs/util/util/volume.lua
new file mode 100644
index 0000000..750f67c
--- /dev/null
+++ b/pkgs/util/util/volume.lua
@@ -0,0 +1,47 @@
+local function get_volume()
+  local handle = io.popen("wpctl get-volume @DEFAULT_AUDIO_SINK@")
+  local out = handle:read("*a")
+  handle:close()
+  
+  local num = out:match("^Volume:%s*([%d%.]+)")
+  if not num then
+    error("Unexpected wpctl output: " .. out)
+  end
+  
+  return tonumber(num) * 100
+end
+
+local function notify_volume()
+  os.execute(string.format(
+    "dunstify -t 2000 -h string:x-canonical-private-synchronous:audio 'Volume' -h int:value:%d",
+    math.floor(get_volume())
+  ))
+end
+
+local M = {}
+
+function M.set_volume(vol)
+  os.execute(string.format("wpctl set-volume @DEFAULT_AUDIO_SINK@ %.2f", vol / 100))
+  notify_volume()
+end
+
+function M.volume_up(step)
+  step = step or 5
+  local current = get_volume()
+  local new_volume = math.min(150, current + step)
+  M.set_volume(new_volume)
+end
+
+function M.volume_down(step)
+  step = step or 5
+  local current = get_volume()
+  local new_volume = math.max(0, current - step)
+  M.set_volume(new_volume)
+end
+
+function M.toggle_mute()
+  os.execute("wpctl set-mute @DEFAULT_AUDIO_SINK@ toggle")
+  notify_volume()
+end
+
+return M