New script cmus_announce.lua: Messages current buffer/channel now-pla…

…ying song from cmus.

lua/cmus_announce.lua

@@ -0,0 +1,167 @@
+
+-- cmus_announce.lua - Announce currently playing file in cmus to channel
+
+--[[
+BSD Zero Clause License
+
+iCopyright © 2024-2024 by <khwerz+weechat@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+--]]
+
+--[[
+NOTE!
+	cmus-remote could hang if you don't have mpris installed giving you a warning at the beginning
+
+Design
+	A defaultFormat is passed to cmus format_print, output is absorbed and s/\n/ /
+	be aware that spaces in cmus become newlines, so s/\n/ / is used
+	string.sub is run to limit the output
+
+TODO
+	Probably add/support colors %{red} and so on
+	defaultFormat should be more colorful, with some emojis
+--]]
+
+local defaultFormat = "%{artist} - %{album} - %{title}"
+local msgLimit = 250
+
+local
+	io, string, os
+	=
+	io, string, os
+
+local Gsub = string.gsub
+
+local ShellArgS = function -- string
+(
+	cmdS -- string
+)
+	return "'" .. Gsub(cmdS, "'","'\\''") .. "'"
+end
+
+local ExistsB, Exists do
+	local Rename = os.rename
+	ExistsB = function(fileS)
+	-- returns true/false if fileS exists
+		local B, _, code = Rename(fileS,fileS)
+		return B or code==13
+	end
+
+	-- returns fileS if fileS exists or falsy
+	Exists = function(fileS)
+		return ExistsB(fileS) and fileS
+	end
+end
+
+local Getenv = os.getenv
+
+local XDG_RUNTIME_DIR =
+	Getenv"XDG_RUNTIME_DIR"
+	or "/run/nmz"
+
+local cmusSocketFile = Getenv"CMUS_SOCKET"
+
+
+local IsAlive = function ()
+	if cmusSocketFile then
+		return ExistsB(cmusSocketFile)
+	end
+	cmusSocketFile = Exists(XDG_RUNTIME_DIR .. "/cmus-socket")
+	return cmusSocketFile
+end
+
+-- Get Current Song
+local Current = function -- string
+(
+	format -- string|falsy
+)
+	format = format or defaultFormat
+
+	local arg = ShellArgS("format_print " .. format)
+	local S
+	do
+		local H = io.popen("cmus-remote -C " .. arg)
+		S = H:read"a"
+		H:close()
+	end
+	return S or ""
+end
+
+-- displays filename if nothing useful returns
+local Display = function -- string
+(
+	format -- string|nil
+)
+	local msg = Current(format)
+	-- if Current is empty, then just print {path}
+	if not msg:match"[%ul]+" then
+		msg = Current"%{filename}"
+	end
+	msg =
+		Gsub(msg or "", "%s+"," ")
+		:gsub("^%s+","")
+		:gsub("%s+$","")
+		-- spaces turn into newlines, this reverses that
+	return msg
+end
+
+if weechat then --------------------------- Weechat Section
+	local w = weechat
+
+	do local name, author, version, license, description, shutdown_function, charset
+	 name		= "cmus_announce"
+	 author 	= "nmz"
+	 version	= "1"
+	 license	= "0BSD"
+	 description	= "Messages current buffer/channel the currently listened to song"
+	 charset	= ""
+	 shutdown_function = ""
+	 w.register(name, author, version, license, description, shutdown_function, charset)
+	end
+
+	-- semi global variables
+	local OK,ERR = w.WEECHAT_RC_OK, w.WEECHAT_RC_ERROR
+
+	local Sub = string.sub
+
+	-- data, buffer, args(string)
+	function cmus_announce(d,b,a)
+		if IsAlive() then
+			local msg = Sub(Display(a:match"%%{%g+}" and a),1,msgLimit) -- BUG: if its utf8 this might cut the last byte
+			w.command(b, "/me Is Listening To: " .. msg)
+		else
+			w.print("","cmus_announce.lua: cmus is not running!")
+			-- return ERR
+		end
+		return OK
+	end
+
+	-- should be a /me
+	do
+		local command = "cmus_announce"
+		local description = 'Announces currently playing song in current buffer'
+		local args = 'format'
+		local args_description =
+			"passed to cmus-remote command, so look at cmus(1) for the relevant formatting"
+		local completion = ""
+		local callback = command
+		local callback_data = ""
+		w.hook_command(command, description, args, args_description, completion, callback, callback_data)
+	end
+	return OK
+end -- weechat
+
+-- This is also a program which you can run as well.
+-- run it to test it.
+if ...==nil then
+	if IsAlive() then
+		print(os.date())
+		print(Display())
+		os.exit(0)
+	end
+
+	os.exit(1)
+end