fixed output rendering in term.write a bit; cleaned up shell execution logic a little (shell.execute now loads the $SHELL directly and runs it with the command that should be performed); added option for a read timeout to buffer:read; primitive variable expansion for default shell (no support for escaped quotes/brackets)

src/main/java/li/cil/oc/server/component/InternetCard.scala

@@ -134,7 +134,7 @@ class InternetCard extends ManagedComponent {
   def isTcpEnabled(context: Context, args: Arguments): Array[AnyRef] = result(Settings.get.httpEnabled)
 
   @Callback(doc = """function(address:string[, port:number]):number -- Opens a new TCP connection. Returns the handle of the connection.""")
-  def connect(context: Context, args: Arguments): Array[AnyRef] = {
+  def connect(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
     val address = args.checkString(0)
     val port = if (args.count > 1) args.checkInteger(1) else -1
     if (!Settings.get.tcpEnabled) {
@@ -153,8 +153,8 @@ class InternetCard extends ManagedComponent {
     result(handle)
   }
 
-  @Callback(doc = """function(handle:number) -- Closes an open socket stream.""")
-  def close(context: Context, args: Arguments): Array[AnyRef] = {
+  @Callback(direct = true, doc = """function(handle:number) -- Closes an open socket stream.""")
+  def close(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
     val handle = args.checkInteger(0)
     connections.remove(handle) match {
       case Some(socket) => socket.close()
@@ -164,7 +164,7 @@ class InternetCard extends ManagedComponent {
   }
 
   @Callback(doc = """function(handle:number, data:string):number -- Tries to write data to the socket stream. Returns the number of bytes written.""")
-  def write(context: Context, args: Arguments): Array[AnyRef] = {
+  def write(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
     val handle = args.checkInteger(0)
     val value = args.checkByteArray(1)
     connections.get(handle) match {
@@ -176,7 +176,7 @@ class InternetCard extends ManagedComponent {
   }
 
   @Callback(doc = """function(handle:number, n:number):string -- Tries to read data from the socket stream. Returns the read byte array.""")
-  def read(context: Context, args: Arguments): Array[AnyRef] = {
+  def read(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
     val handle = args.checkInteger(0)
     val n = math.min(Settings.get.maxReadBuffer, math.max(0, args.checkInteger(1)))
     connections.get(handle) match {
@@ -222,7 +222,7 @@ class InternetCard extends ManagedComponent {
     }
   }
 
-  override def onDisconnect(node: Node) {
+  override def onDisconnect(node: Node) = this.synchronized {
     super.onDisconnect(node)
     if (owner.isDefined && (node == this.node || node.host.isInstanceOf[Context] && (node.host.asInstanceOf[Context] == owner.get))) {
       owner = None
@@ -236,7 +236,7 @@ class InternetCard extends ManagedComponent {
     }
   }
 
-  override def onMessage(message: Message) {
+  override def onMessage(message: Message) = this.synchronized {
     super.onMessage(message)
     message.data match {
       case Array() if (message.name == "computer.stopped" || message.name == "computer.started") && owner.isDefined && message.source.address == owner.get.node.address =>

src/main/resources/assets/opencomputers/lua/component/internet/bin/pastebin.lua

@@ -16,7 +16,7 @@ local args, options = shell.parse(...)
 local function get(pasteId, filename)
   local f, reason = io.open(filename, "w")
   if not f then
-    io.stderr:write("Failed opening file for writing: ", reason)
+    io.stderr:write("Failed opening file for writing: " .. reason)
     return
   end
 
@@ -33,12 +33,12 @@ local function get(pasteId, filename)
     end
 
     f:close()
-    io.write("Saved data to ", filename, "\n")
+    io.write("Saved data to " .. filename .. "\n")
   else
     io.write("failed.\n")
     f:close()
     fs.remove(filename)
-    io.stderr:write("HTTP request failed: ", response, "\n")
+    io.stderr:write("HTTP request failed: " .. response .. "\n")
   end
 end
 
@@ -48,7 +48,7 @@ function encode(code)
     code = string.gsub(code, "([^%w ])", function (c)
       return string.format("%%%02X", string.byte(c))
     end)
-    code = string.gsub (code, " ", "+")
+    code = string.gsub(code, " ", "+")
   end
   return code 
 end
@@ -74,14 +74,14 @@ function put(path)
   if configFile then
     local result, reason = pcall(configFile)
     if not result then
-      io.stderr:write("Failed loading config: ", reason)
+      io.stderr:write("Failed loading config: " .. reason)
     end
   end
   config.key = config.key or "fd92bd40a84c127eeb6804b146793c97"
   local file, reason = io.open(path, "r")
 
   if not file then
-    io.stderr:write("Failed opening file for reading: ", reason)
+    io.stderr:write("Failed opening file for reading: " .. reason)
     return
   end
 
@@ -109,8 +109,8 @@ function put(path)
     else
       io.write("success.\n")
       local pasteId = string.match(info, "[^/]+$")
-      io.write("Uploaded as ", info, "\n")
-      io.write('Run "pastebin get ', pasteId, '" to download anywhere.')
+      io.write("Uploaded as " .. info .. "\n")
+      io.write('Run "pastebin get ' .. pasteId .. '" to download anywhere.')
     end
   else
     io.write("failed.\n")

src/main/resources/assets/opencomputers/lua/component/internet/bin/wget.lua

@@ -47,7 +47,7 @@ end
 
 local f, reason = io.open(filename, "wb")
 if not f then
-  io.stderr:write("failed opening file for writing: ", reason)
+  io.stderr:write("failed opening file for writing: " .. reason)
   return
 end
 
@@ -65,7 +65,7 @@ if result then
 
   f:close()
   if not options.q then
-    io.write("Saved data to ", filename, "\n")
+    io.write("Saved data to " .. filename .. "\n")
   end
 else
   if not options.q then
@@ -73,5 +73,5 @@ else
   end
   f:close()
   fs.remove(filename)
-  io.stderr:write("HTTP request failed: ", response, "\n")
+  io.stderr:write("HTTP request failed: " .. response .. "\n")
 end

src/main/resources/assets/opencomputers/lua/component/internet/lib/internet.lua

@@ -109,13 +109,7 @@ function internet.socket(address, port)
   -- the __gc metamethod. So we start a timer to do the yield/cleanup.
   local function cleanup(self)
     if not self.handle then return end
-    -- save non-gc'ed values as upvalues
-    local inet = self.inet
-    local handle = self.handle
-    local function close()
-      inet.close(handle)
-    end
-    event.timer(0, close)
+    pcall(self.inet.close, self.handle)
   end
   local metatable = {__index = socketStream,
                      __gc = cleanup,

src/main/resources/assets/opencomputers/lua/rom/bin/alias.lua

@@ -4,7 +4,7 @@ local args = shell.parse(...)
 
 if #args == 0 then
   for name, value in shell.aliases() do
-    io.write(name, " ", value, "\n")
+    io.write(name .. " " .. value .. "\n")
   end
 elseif #args == 1 then
   local value = shell.getAlias(args[1])
@@ -15,5 +15,5 @@ elseif #args == 1 then
   end
 else
   shell.setAlias(args[1], args[2])
-  io.write("alias created: ", args[1], " -> ", args[2])
+  io.write("alias created: " .. args[1] .. " -> " .. args[2])
 end

src/main/resources/assets/opencomputers/lua/rom/bin/besh.lua

@@ -253,7 +253,7 @@ local function execute(command, env, ...)
   for i = 1, #commands do
     local program, args, input, output, mode = table.unpack(commands[i])
     local reason
-    threads[i], reason = shell.load(program, env, function()
+    threads[i], reason = process.load(shell.resolve(program, "lua"), env, function()
       if input then
         local file, reason = io.open(shell.resolve(input))
         if not file then

src/main/resources/assets/opencomputers/lua/rom/bin/components.lua

@@ -1,5 +1,5 @@
 local component = require("component")
 
 for address, name in component.list() do
-  io.write(name, "\t", address, "\n")
+  io.write(name .. "\t" .. address .. "\n")
 end

src/main/resources/assets/opencomputers/lua/rom/bin/ls.lua

@@ -18,7 +18,7 @@ for i = 1, #dirs do
   end
   local list, reason = fs.list(path)
   if not list then
-    io.write(reason, "\n")
+    io.write(reason .. "\n")
   else
     local function setColor(c)
       if component.gpu.getForeground() ~= c then
@@ -40,7 +40,7 @@ for i = 1, #dirs do
     setColor(0x99CCFF)
     for _, d in ipairs(lsd) do
       if options.a or d:sub(1, 1) ~= "." then
-        io.write(d, "\t")
+        io.write(d .. "\t")
         if options.l or io.output() ~= io.stdout then
           io.write("\n")
         end
@@ -55,7 +55,7 @@ for i = 1, #dirs do
         setColor(0xFFFFFF)
       end
       if options.a or f:sub(1, 1) ~= "." then
-        io.write(f, "\t")
+        io.write(f .. "\t")
         if options.l then
           setColor(0xFFFFFF)
           io.write(fs.size(fs.concat(path, f)), "\n")

src/main/resources/assets/opencomputers/lua/rom/bin/lua.lua

@@ -16,11 +16,11 @@ local env = setmetatable({}, {__index = function(t, k)
 end})
 
 component.gpu.setForeground(0xFFFFFF)
-io.write("Lua 5.2.3 Copyright (C) 1994-2013 Lua.org, PUC-Rio\n")
+term.write("Lua 5.2.3 Copyright (C) 1994-2013 Lua.org, PUC-Rio\n")
 component.gpu.setForeground(0xFFFF00)
-io.write("Enter a statement and hit enter to evaluate it.\n")
-io.write("Prefix an expression with '=' to show its value.\n")
-io.write("Press Ctrl+C to exit the interpreter.\n")
+term.write("Enter a statement and hit enter to evaluate it.\n")
+term.write("Prefix an expression with '=' to show its value.\n")
+term.write("Press Ctrl+C to exit the interpreter.\n")
 component.gpu.setForeground(0xFFFFFF)
 
 while term.isAvailable() do
@@ -46,16 +46,16 @@ while term.isAvailable() do
       if type(result[2]) == "table" and result[2].reason == "terminated" then
         os.exit(result[2].code)
       end
-      io.stderr:write(tostring(result[2]), "\n")
+      io.stderr:write(tostring(result[2]) .. "\n")
     else
       for i = 2, result.n do
-        io.write(text.serialize(result[i], true), "\t")
+        term.write(text.serialize(result[i], true) .. "\t")
       end
-      if result.n > 1 then
-        io.write("\n")
+      if term.getCursor() > 1 then
+        term.write("\n")
       end
     end
   else
-    io.stderr:write(reason, "\n")
+    io.stderr:write(tostring(reason) .. "\n")
   end
 end

src/main/resources/assets/opencomputers/lua/rom/bin/mkdir.lua

@@ -18,6 +18,6 @@ for i = 1, #args do
         reason = "unknown reason"
       end
     end
-    io.stderr:write(path, ": ", reason, "\n")
+    io.stderr:write(path .. ": " .. reason .. "\n")
   end
 end

src/main/resources/assets/opencomputers/lua/rom/bin/redstone.lua

@@ -50,8 +50,8 @@ if options.b then
     end
     rs.setBundledOutput(side, color, value)
   end
-  io.write("in: ", rs.getBundledInput(side, color), "\n")
-  io.write("out: ", rs.getBundledOutput(side, color))
+  io.write("in: " .. rs.getBundledInput(side, color) .. "\n")
+  io.write("out: " .. rs.getBundledOutput(side, color))
 else
   if #args > 1 then
     local value = args[2]
@@ -62,6 +62,6 @@ else
     end
     rs.setOutput(side, value)
   end
-  io.write("in: ", rs.getInput(side), "\n")
-  io.write("out: ", rs.getOutput(side))
+  io.write("in: " .. rs.getInput(side) .. "\n")
+  io.write("out: " .. rs.getOutput(side))
 end

src/main/resources/assets/opencomputers/lua/rom/bin/rm.lua

@@ -9,6 +9,6 @@ end
 for i = 1, #args do
   local path = shell.resolve(args[i])
   if not os.remove(path) then
-    io.stderr:write(path, ": no such file, or permission denied\n")
+    io.stderr:write(path .. ": no such file, or permission denied\n")
   end
 end

src/main/resources/assets/opencomputers/lua/rom/bin/set.lua

@@ -2,7 +2,7 @@ local args = {...}
 
 if #args < 1 then
   for k,v in pairs(os.getenv()) do
-    io.write(k, "='", string.gsub(v, "'", [['"'"']]), "'\n")
+    io.write(k .. "='" .. string.gsub(v, "'", [['"'"']]) .. "'\n")
   end
 else
   local count = 0 

src/main/resources/assets/opencomputers/lua/rom/bin/sh.lua

@@ -6,45 +6,133 @@ local shell = require("shell")
 local term = require("term")
 local text = require("text")
 
-local args, options = shell.parse(...)
-local history = {}
-
-if options.v or not process.running(2) then
-  io.write(_OSVERSION .. " (" .. math.floor(computer.totalMemory() / 1024) .. "k RAM)\n")
+local function expand(value)
+  return value:gsub("%$(%w+)", os.getenv):gsub("%$%b{}",
+    function(match) return os.getenv(expand(match:sub(3, -2))) or match end)
 end
 
-while true do
-  if not term.isAvailable() then -- don't clear unless we lost the term
-    while not term.isAvailable() do
-      event.pull("term_available")
-    end
-    term.clear()
-    if options.v then
-      io.write(_OSVERSION .. " (" .. math.floor(computer.totalMemory() / 1024) .. "k RAM)\n")
+local function evaluate(value)
+  local init, result = 1, ""
+  repeat
+    local match = value:match("^%b''", init)
+    if match then -- single quoted string. no variable expansion.
+      match = match:sub(2, -2)
+      init = init + 2
+      result = result .. match
+    else
+      match = value:match('^%b""', init)
+      if match then -- double quoted string.
+        match = match:sub(2, -2)
+        init = init + 2
+      else
+        -- plaintext?
+        match = value:match("^([^']+)%b''", init)
+        if not match then -- unmatched single quote.
+          match = value:match('^([^"]+)%b""', init)
+          if not match then -- unmatched double quote.
+            match = value:sub(init)
+          end
+        end
+      end
+      result = result .. expand(match)
     end
+    init = init + #match
+  until init > #value
+  return result
+end
+
+local function execute(command, ...)
+  local parts, reason = text.tokenize(command)
+  if not parts then
+    return false, reason
+  elseif #parts == 0 then
+    return true
   end
-  while term.isAvailable() do
-    local foreground = component.gpu.setForeground(0xFF0000)
-    term.write(os.getenv("PS1") or "# ")
-    component.gpu.setForeground(foreground)
-    local command = term.read(history)
-    if not command then
-      io.write("exit\n")
-      return -- eof
-    end
-    while #history > 10 do
-      table.remove(history, 1)
-    end
-    command = text.trim(command)
-    if command == "exit" then
-      return
-    elseif command ~= "" then
-      local result, reason = os.execute(command)
-      if not result then
-        io.stderr:write(reason .. "\n")
-      elseif term.getCursor() > 1 then
-        io.write("\n")
+  local program, args = shell.resolveAlias(parts[1], table.pack(select(2, table.unpack(parts))))
+  program = evaluate(program)
+  local program, reason = shell.resolve(program, "lua")
+  if not program then
+    return false, reason
+  end
+  for i = 1, args.n do
+    args[i] = evaluate(args[i])
+  end
+  for _, arg in ipairs(table.pack(...)) do
+    table.insert(args, arg)
+  end
+  table.insert(args, 1, true)
+  args.n = #args
+  local thread, reason = process.load(shell.resolve(program, "lua"), env, nil, command)
+  if not thread then
+    return false, reason
+  end
+  local result = nil
+  -- Emulate CC behavior by making yields a filtered event.pull()
+  while args[1] and coroutine.status(thread) ~= "dead" do
+    result = table.pack(coroutine.resume(thread, table.unpack(args, 2, args.n)))
+    if coroutine.status(thread) ~= "dead" then
+      if type(result[2]) == "string" then
+        args = table.pack(pcall(event.pull, table.unpack(result, 2, result.n)))
+      else
+        args = {true, n=1}
       end
     end
   end
+  if not args[1] then
+    return false, args[2]
+  end
+  if not result[1] and type(result[2]) == "table" and result[2].reason == "terminated" then
+    if result[2].code then
+      return true
+    else
+      return false, "terminated"
+    end
+  end
+  return table.unpack(result, 1, result.n)
+end
+
+local args, options = shell.parse(...)
+local history = {}
+
+if #args == 0 and (io.input() == io.stdin or options.i) and not options.c then
+  -- interactive shell.
+  while true do
+    if not term.isAvailable() then -- don't clear unless we lost the term
+      while not term.isAvailable() do
+        event.pull("term_available")
+      end
+      term.clear()
+    end
+    while term.isAvailable() do
+      local foreground = component.gpu.setForeground(0xFF0000)
+      term.write(expand(os.getenv("PS1") or "$ "))
+      component.gpu.setForeground(foreground)
+      local command = term.read(history)
+      if not command then
+        term.write("exit\n")
+        return -- eof
+      end
+      while #history > 10 do
+        table.remove(history, 1)
+      end
+      command = text.trim(command)
+      if command == "exit" then
+        return
+      elseif command ~= "" then
+        local result, reason = execute(command)
+        if not result then
+          io.stderr:write(reason .. "\n")
+        elseif term.getCursor() > 1 then
+          term.write("\n")
+        end
+      end
+    end
+  end
+else
+  -- execute command.
+  local result = table.pack(execute(table.unpack(args)))
+  if not result[1] then
+    error(result[2])
+  end
+  return table.unpack(result, 2)
 end

src/main/resources/assets/opencomputers/lua/rom/bin/unalias.lua

@@ -11,5 +11,5 @@ if not result then
   io.stderr:write("no such alias")
 else
   shell.setAlias(args[1], nil)
-  io.write("alias removed: ", args[1], " -> ", result)
+  io.write("alias removed: " .. args[1] .. " -> " .. result)
 end

src/main/resources/assets/opencomputers/lua/rom/bin/which.lua

@@ -14,8 +14,8 @@ for i = 1, #args do
     result, reason = shell.resolve(args[i], "lua")
   end
   if result then
-    io.write(result, "\n")
+    io.write(result .. "\n")
   else
-    io.stderr:write(args[i], ": ", reason, "\n")
+    io.stderr:write(args[i] .. ": " .. reason .. "\n")
   end
 end

src/main/resources/assets/opencomputers/lua/rom/init.lua

@@ -1,17 +1,20 @@
 local component = require("component")
 local computer = require("computer")
+local event = require("event")
 
 for c, t in component.list() do
   computer.pushSignal("component_added", c, t)
 end
 os.sleep(0.5) -- Allow signal processing by libraries.
-
-require("term").clear()
-
 computer.pushSignal("init") -- so libs know components are initialized.
+
 while true do
-  local result, reason = os.execute(os.getenv("SHELL"))
+  require("term").clear()
+  io.write(_OSVERSION .. " (" .. math.floor(computer.totalMemory() / 1024) .. "k RAM)\n")
+  local result, reason = os.execute(os.getenv("SHELL") .. " -")
   if not result then
-    print(reason)
+    io.stderr:write((reason or "unknown error") .. "\n")
+    print("Press any key to continue.")
+    event.pull("key")
   end
 end

src/main/resources/assets/opencomputers/lua/rom/lib/buffer.lua

@@ -10,7 +10,8 @@ function buffer.new(mode, stream)
     bufferRead = "",
     bufferWrite = "",
     bufferSize = math.max(512, math.min(8 * 1024, computer.freeMemory() / 8)),
-    bufferMode = "full"
+    bufferMode = "full",
+    readTimeout = math.huge
   }
   mode = mode or "r"
   for i = 1, unicode.len(mode) do
@@ -58,7 +59,12 @@ function buffer:lines(...)
 end
 
 function buffer:read(...)
+  local timeout = computer.uptime() + self.readTimeout
+
   local function readChunk()
+    if computer.uptime() > timeout then
+      error("timeout")
+    end
     local result, reason = self.stream:read(self.bufferSize)
     if result then
       self.bufferRead = self.bufferRead .. result
@@ -213,6 +219,14 @@ function buffer:setvbuf(mode, size)
   return self.bufferMode, self.bufferSize
 end
 
+function buffer:getTimeout()
+  return self.readTimeout
+end
+
+function buffer:setTimeout(value)
+  self.readTimeout = tonumber(value)
+end
+
 function buffer:write(...)
   if self.closed then
     return nil, "bad file descriptor"

src/main/resources/assets/opencomputers/lua/rom/lib/shell.lua

@@ -1,7 +1,8 @@
 local event = require("event")
 local fs = require("filesystem")
-local unicode = require("unicode")
+local process = require("process")
 local text = require("text")
+local unicode = require("unicode")
 
 local shell = {}
 local aliases = {}
@@ -130,39 +131,11 @@ function shell.resolve(path, ext)
 end
 
 function shell.execute(command, env, ...)
-  checkArg(1, command, "string")
-  local parts, reason = text.tokenize(command)
-  if not parts then
+  local sh, reason = loadfile(shell.resolve(os.getenv("SHELL"), "lua"), "t", env)
+  if not sh then
     return false, reason
   end
-  if #parts == 0 then
-    return true
-  end
-  local program, args = shell.resolveAlias(parts[1], table.pack(select(2, table.unpack(parts))))
-  table.insert(args, 1, true)
-  for _, arg in ipairs(table.pack(...)) do
-    table.insert(args, arg)
-  end
-  args.n = #args
-  local thread, reason = shell.load(program, env, nil, command)
-  if not thread then
-    return false, reason
-  end
-  local result = nil
-  -- Emulate CC behavior by making yields a filtered event.pull()
-  while args[1] and coroutine.status(thread) ~= "dead" do
-    result = table.pack(coroutine.resume(thread, table.unpack(args, 2, args.n)))
-    if coroutine.status(thread) ~= "dead" then
-      if type(result[2]) == "string" then
-        args = table.pack(pcall(event.pull, table.unpack(result, 2, result.n)))
-      else
-        args = {true, n=1}
-      end
-    end
-  end
-  if not args[1] then
-    return false, args[2]
-  end
+  local result = table.pack(pcall(sh, command, ...))
   if not result[1] and type(result[2]) == "table" and result[2].reason == "terminated" then
     if result[2].code then
       return true
@@ -173,21 +146,15 @@ function shell.execute(command, env, ...)
   return table.unpack(result, 1, result.n)
 end
 
-function shell.load(path, env, init, name)
-  local path, reason = shell.resolve(path, "lua")
-  if not path then
-    return nil, reason
-  end
-  return require("process").load(path, env, init, name)
-end
-
 function shell.parse(...)
   local params = table.pack(...)
   local args = {}
   local options = {}
   for i = 1, params.n do
     local param = params[i]
-    if unicode.sub(param, 1, 1) == "-" then
+    if type(param) == "string" and unicode.sub(param, 1, 2) == "--" then
+      options[unicode.sub(param, 3)] = true
+    elseif type(param) == "string" and unicode.sub(param, 1, 1) == "-" then
       for j = 2, unicode.len(param) do
         options[unicode.sub(param, j, j)] = true
       end

src/main/resources/assets/opencomputers/lua/rom/lib/term.lua

@@ -340,12 +340,14 @@ function term.write(value, wrap)
   term.setCursorBlink(false)
   local line, nl = value
   repeat
+    local wrapAfter, margin = math.huge, math.huge
     if wrap then
-      line, value, nl = text.wrap(value, w - (cursorX - 1), w)
+      wrapAfter, margin = w - (cursorX - 1), w
     end
+    line, value, nl = text.wrap(value, wrapAfter, margin)
     component.gpu.set(cursorX, cursorY, line)
     cursorX = cursorX + unicode.len(line)
-    if nl or cursorX > w then
+    if nl or (cursorX > w and wrap) then
       cursorX = 1
       cursorY = cursorY + 1
     end

src/main/resources/assets/opencomputers/lua/rom/lib/text.lua

@@ -10,7 +10,8 @@ function text.detab(value, tabWidth)
     local spaces = tabWidth - match:len() % tabWidth
     return match .. string.rep(" ", spaces)
   end
-  return value:gsub("([^\n]-)\t", rep)
+  local result = value:gsub("([^\n]-)\t", rep) -- truncate results
+  return result
 end
 
 function text.padRight(value, length)
@@ -43,6 +44,7 @@ end
 function text.wrap(value, width, maxWidth)
   checkArg(1, value, "string")
   checkArg(2, width, "number")
+  checkArg(3, maxWidth, "number")
   local line, nl = value:match("([^\r\n]*)([\r\n]?)") -- read until newline
   if unicode.len(line) > width then -- do we even need to wrap?
     local partial = unicode.sub(line, 1, width)