Proto terminal interface.

Still doesn't do much yet, but the terminal code is somewhat
working. Need to limit output to ~16-18 lines. Implement locking
with triggers unlocking, input of text files, file/folder structure?

mods/terminal/init.lua

@@ -0,0 +1,125 @@
+
+--[[
+
+  terminal - an interactive terminal
+
+]]--
+
+local context = {}
+
+local commands = {
+	cls = function(output, params)
+		return ""
+	end,
+	md = function(output, params)
+		return output .. "\n" .. "command not implemented"
+	end,
+	copycon = function(output, params)
+		return output .. "\n" .. "command not implemented"
+	end,
+	dir = function(output, params)
+		return output .. "\n" .. "command not implemented"
+	end,
+	cd = function(output, params)
+		return output .. "\n" .. "command not implemented"
+	end,
+	echo = function(output, params)
+		return output .. "\n" .. params
+	end,
+	type = function(output, params)
+		return output .. "\n" .. "command not implemented"
+	end,
+	lock = function(output, params)
+		--FIXME need pos to set meta lock value
+		return output .. "\n" .. "terminal locked"
+	end,
+	help = function(output, params)
+		return output .. "\n" ..
+			"cls md copycon dir cd echo type help"
+	end,
+}
+
+local function make_formspec(output, prompt)
+	local f =
+		"size[12,8]" ..
+		"textlist[0.4,0.5;11,6;output;"
+	for part in output:gmatch("[^\r\n]+") do
+		f = f .. minetest.formspec_escape(part) .. ","
+	end
+	f = f .. minetest.formspec_escape(prompt) .. "]field[0.7,7;11.2,1;input;;]"
+	return f
+end
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	if formname ~= "terminal:" then
+		return false
+	end
+	local input = fields.input
+	if input and input ~= "" then
+		local name = player:get_player_name()
+		local c = context[name]
+		local output = c.output or ""
+		output = output .. "\nc:" .. c.path .. "> " .. input
+		local cmd = ""
+		local params = ""
+		for w in input:gmatch("%w+") do
+			if cmd == "" then
+				cmd = w
+			elseif params == "" then
+				params = w
+			else
+				params = params .. " " .. w
+			end
+		end
+		local fn = commands[cmd]
+		if fn then
+			output = fn(output, params)
+		else
+			output = output .. "\n" .. "Syntax Error"
+		end
+		c.output = output
+		minetest.show_formspec(name, "terminal:", make_formspec(output, "c:\\> "))
+	end
+	return true
+end)
+
+local terminal_use = function(pos, node, clicker, itemstack, pointed_thing)
+	if not clicker then
+		return
+	end
+	local name = clicker:get_player_name()
+	context[name] = {
+		pos = pos,
+		rw = false,
+		path = "\\",
+		output = "",
+	}
+	if boxes.players_editing_boxes[name] or
+			(not boxes.players_in_boxes[name] and minetest.check_player_privs(clicker, "server")) then
+		-- allow rw access
+		context[name].rw = true
+	end
+	-- send formspec to player
+	minetest.show_formspec(name, "terminal:", make_formspec("", "c:\\> "))
+end
+
+
+minetest.register_node("terminal:terminal", {
+	description = "An interactive terminal console emulator access interface unit controller",
+	drawtype = "mesh",
+	mesh = "terminal.obj",
+	tiles = {
+		{name = "terminal_base.png"},
+		{name = "terminal_idle.png", animation = {type = "vertical_frames", aspect_w = 14, aspect_h = 13, length = 4.0}},
+	},
+	paramtype = "light",
+	paramtype2 = "facedir",
+	on_trigger = function(pos)
+		-- unlock terminal
+		-- a locked terminal replies "access denied" to every command
+	end,
+	on_untrigger = function(pos)
+		-- lock terminal
+	end,
+	on_rightclick = terminal_use,
+})

mods/terminal/models/terminal.obj

@@ -0,0 +1,150 @@
+# Blender v2.78 (sub 0) OBJ File: 'terminal.blend'
+# www.blender.org
+mtllib terminal.mtl
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