1 files changed, 107 insertions, 0 deletions
diff --git a/lib/pavolctld.lua b/lib/pavolctld.lua
new file mode 100644
index 0000000..b6b6237
--- /dev/null
+++ b/lib/pavolctld.lua
@@ -0,0 +1,107 @@
+local awful = require("awful")
+local naughty = require("naughty")
+
+-- Gio is used to handle the subprocess instead of awful.spawn.
+-- Gio is more flexible and allows writing to stdin.
+-- also, awful.spawn.with_line_callback does not play nicely with pavolctld, as
+-- it seems to feed the stdout back into its stdin and kill performance.
+local lgi = require("lgi")
+local Gio = lgi.Gio
+
+-- start subprocess
+local p = Gio.Subprocess.new({ "pavolctld" }, Gio.SubprocessFlags.STDIN_PIPE + Gio.SubprocessFlags.STDOUT_PIPE)
+
+local stdout = p:get_stdout_pipe()
+local stdin  = p:get_stdin_pipe()
+
+-- state vars
+local sinks = {
+	default = nil,
+	command = nil, -- sink being modified by commands
+	sinks = {},
+}
+
+function sinks.get(i)
+	if sinks.sinks[i] == nil then
+		sinks.sinks[i] = {
+			vol  = 0,
+			db   = 0.0,
+			mute = 0,
+			name = "",
+			desc = "",
+		}
+	end
+	return sinks.sinks[i]
+end
+
+-- return table
+local pavolctld = { _cb = {}, sinks = sinks }
+
+-- callbacks
+function pavolctld.set_volume_change_callback(cb)       pavolctld._cb['v'] = cb end
+function pavolctld.set_sink_change_callback(cb)         pavolctld._cb['s'] = cb end
+function pavolctld.set_default_sink_change_callback(cb) pavolctld._cb['f'] = cb end
+function pavolctld.set_sink_remove_callback(cb)         pavolctld._cb['x'] = cb end
+
+-- parse output
+function parse_csv(csv)
+	return (csv .. ","):gmatch("(.-),")
+end
+
+awful.spawn.read_lines(stdout, function(s)
+	local cmd = s:sub(1, 1) -- first char of output
+	-- volume change
+	if cmd == 'v' then
+		local v = parse_csv(s:sub(2))
+		local i = tonumber(v())
+		local sink = sinks.get(i)
+		sink.vol  = tonumber(v())
+		sink.db   = tonumber(v())
+		sink.mute = tonumber(v())
+	-- sink description change
+	elseif cmd == 's' then
+		local v = parse_csv(s:sub(2))
+		local i = tonumber(v())
+		local sink = sinks.get(i)
+		sink.name = v()
+		sink.desc = v()
+	-- default sink change
+	elseif cmd == 'f' then
+		local f = tonumber(s:sub(2))
+		sinks.default = sinks.get(f)
+		-- set command sink to default sink for now TODO change later
+		send_cmd("s")
+	-- sink removed
+	elseif cmd == 'x' then
+		local x = tonumber(s:sub(2))
+		table.remove(sinks.sinks, x)
+	-- unrecognized cmd
+	else
+		naughty.notify({
+			preset = naughty.config.presets.critical,
+			title = "pavolctld error",
+			text = s
+		})
+	end
+	-- run command callback
+	if pavolctld._cb[cmd] then
+		pavolctld._cb[cmd]()
+	end
+end)
+
+-- pavolctld takes commands in using stdin
+function send_cmd(cmd)
+	local _, err = stdin:write_all(cmd .. "\n", nil)
+
+	if err then return nil end
+	return true
+end
+
+function pavolctld.volume_inc(vol) return send_cmd("v+" .. vol) end
+function pavolctld.volume_dec(vol) return send_cmd("v-" .. vol) end
+function pavolctld.volume_set(vol) return send_cmd("v"  .. vol) end
+function pavolctld.mute_set(muted) return send_cmd("m" .. muted and 1 or 0) end
+function pavolctld.mute_toggle()   return send_cmd("m") end
+function pavolctld.default_sink_set(i) return send_cmd("f" .. i) end
+
+return pavolctld