Add speaker node

Minor cleanups and fixes by sofar.
Added reading of existing message for easy editing.
Add attribution for sound effect.

mods/mech/depends.txt

@@ -1,3 +1,4 @@
 boxes
 frame
 sounds
+fsc

mods/mech/init.lua

@@ -1,4 +1,3 @@
-
 --[[
 
   mech - mechanisms for Inside The Box
@@ -1378,6 +1377,57 @@ minetest.register_node("mech:randomizer", {
 	end,
 })
 
+minetest.register_node("mech:speaker", {
+	description = S("Speaker"),
+	tiles = {"speaker.png"},
+	groups = {node = 1, unbreakable = 1},
+	sounds = sounds.metal,
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("msg", "")
+	end,
+	on_rightclick = function(pos, node, puncher, itemstack, pointed_thing)
+		local name = puncher:get_player_name()
+		if not puncher then
+			return itemstack
+		elseif not boxes.players_editing_boxes[name] then
+			return do_player_place(pos, node, puncher, itemstack, pointed_thing)
+		end
+		local meta = minetest.get_meta(pos)
+		local metatable = meta:to_table()
+		local msg = ""
+		if metatable.fields and metatable.fields.msg then
+			msg = metatable.fields.msg
+		end
+		local form = "field[msg;message;" .. msg .. "]"
+		fsc.show(name, form, {}, function(player, fields, context)
+			if fields.msg then
+				meta:set_string("msg", fields.msg)
+				return true
+			end
+			return nil
+		end)
+		return itemstack
+	end,
+	on_trigger = function(pos)
+		local box = boxes.find_box(pos)
+		if not box then
+			return
+		end
+		local meta = minetest.get_meta(pos)
+		local msg = meta:get_string("msg")
+		if msg then
+			-- underline text character
+			local underline = string.char(0xcd) .. string.char(0x9f)
+			local newstring = ""
+			for i = 0, #msg, 1 do
+				newstring = newstring .. string.sub(msg, i, i) .. underline
+			end
+			minetest.chat_send_player(box.name, newstring)
+			minetest.sound_play("speaker_trigger", {to_player = box.name}, true)
+		end
+	end,
+})
 
 -- event reactors:
 -- doors

mods/mech/sounds/license.md

@@ -0,0 +1,2 @@
+ * speaker_trigger : From AlienX, CC-BY-3.0
+   - https://freesound.org/people/AlienXXX/sounds/249975/