function read(filename) local file = io.open(filename, "r") if file == nil then return nil end local content = file:read"*a" file:close() return content end function write(filename, new_content) local file = io.open(filename, "w") if file == nil then return false end file:write(new_content) file:close() return true end function ensure_content(filename, ensured_content) local content = read(filename) if content ~= ensured_content then return write(filename, ensured_content) end return true end function append(filename, new_content) local file = io.open(filename, "a") if file == nil then return false end file:write(new_content) file:close() return true end function exists(filename) local file = io.open(filename, "r") if file == nil then return false end file:close() return true end function create_if_not_exists(filename, content) if not exists(filename) then write(filename, content or "") return true end return false end function create_if_not_exists_from_file(filename, src_filename) return create_if_not_exists(filename, read(src_filename)) end if not minetest then return end -- Process Bridge Helpers process_bridges = {} function process_bridge_build(name, input, output, logs) if not input or not output or not logs then minetest.mkdir(minetest.get_worldpath() .. "/bridges/" .. name) end input = input or minetest.get_worldpath() .. "/bridges/" .. name .. "/input.txt" output = output or minetest.get_worldpath() .. "/bridges/" .. name .. "/output.txt" logs = logs or minetest.get_worldpath() .. "/bridges/" .. name .. "/logs.txt" -- Clear input write(input, "") -- Clear output write(output, "") -- Create logs if not exists create_if_not_exists(logs, "") process_bridges[name] = { input = input, output = output, logs = logs, output_file = io.open(output, "a") } end function process_bridge_listen(name, line_consumer, step) local bridge = process_bridges[name] modlib.minetest.register_globalstep(step or 0.1, function() local content = io.open(bridge.input, "r") local line = content:read() while line do line_consumer(line) line = content:read() end write(bridge.input, "") end) end function process_bridge_serve(name, step) local bridge = process_bridges[name] modlib.minetest.register_globalstep(step or 0.1, function() bridge.output_file:close() process_bridges[name].output_file = io.open(bridge.output, "a") end) end function process_bridge_write(name, message) local bridge = process_bridges[name] bridge.output_file:write(message .. "\n") end function process_bridge_start(name, command, os_execute) local bridge = process_bridges[name] os_execute(string.format(command, bridge.output, bridge.input, bridge.logs)) end