reverting read handler weirdness, it didn't work right

Users shouldn't use tty read nor write directly, they should always use io or term. But...it is messy to try to hide these methods as private methods in the io library, so I'll just have to check the io tty-ness just in case

src/main/resources/assets/opencomputers/loot/openos/bin/sh.lua

@@ -12,7 +12,8 @@ end
 
 shell.prime()
 local update_gpu = io.output().tty
-local interactive = io.input().tty
+local needs_profile = io.input().tty
+local input_handler = {hint = sh.hintHandler}
 
 if #args == 0 then
   while true do
@@ -20,14 +21,13 @@ if #args == 0 then
       while not tty.isAvailable() do
         event.pull("term_available")
       end
-      if interactive == true then -- first time run AND interactive
-        interactive = 0
-        tty.setReadHandler({hint = sh.hintHandler})
+      if needs_profile then -- first time run AND interactive
+        needs_profile = nil
         dofile("/etc/profile.lua")
       end
       io.write(sh.expand(os.getenv("PS1") or "$ "))
     end
-    local command = io.read()
+    local command = tty:read(input_handler)
     if command then
       command = text.trim(command)
       if command == "exit" then

src/main/resources/assets/opencomputers/loot/openos/etc/profile.lua

@@ -3,8 +3,10 @@ local tty = require("tty")
 local fs = require("filesystem")
 
 if tty.isAvailable() then
-  tty:write("\27[40m\27[37m")
-  tty.clear()
+  if io.stdout.tty then
+    io.write("\27[40m\27[37m")
+    tty.clear()
+  end
   tty.setCursorBlink(true)
 end
 dofile("/etc/motd")

src/main/resources/assets/opencomputers/loot/openos/lib/core/lua_shell.lua

@@ -68,7 +68,7 @@ local function findKeys(t, r, prefix, name)
   end
 end
 
-tty.setReadHandler({hint = function(line, index)
+local read_handler = {hint = function(line, index)
   line = (line or "")
   local tail = line:sub(index)
   line = line:sub(1, index - 1)
@@ -85,7 +85,7 @@ tty.setReadHandler({hint = function(line, index)
     table.insert(hints, key .. tail)
   end
   return hints
-end})
+end}
 
 io.write("\27[37m".._VERSION .. " Copyright (C) 1994-2017 Lua.org, PUC-Rio\n")
 io.write("\27[33mEnter a statement and hit enter to evaluate it.\n")
@@ -94,7 +94,7 @@ io.write("Press Ctrl+D to exit the interpreter.\n\27[37m")
 
 while tty.isAvailable() do
   io.write(env._PROMPT)
-  local command = io.read()
+  local command = tty:read(read_handler)
   if not command then -- eof
     return
   end

src/main/resources/assets/opencomputers/loot/openos/lib/filesystem.lua

@@ -24,7 +24,6 @@ end
 local function saveConfig()
   local root = filesystem.get("/")
   if root and not root.isReadOnly() then
-    filesystem.makeDirectory("/etc")
     local f = filesystem.open("/etc/filesystem.cfg", "w")
     if f then
       f:write("autorun="..tostring(isAutorunEnabled))

src/main/resources/assets/opencomputers/loot/openos/lib/term.lua

@@ -194,9 +194,6 @@ function term.write(value, wrap)
 end
 
 function term.read(history, dobreak, hint, pwchar, filter)
-  if not io.stdin.tty then
-    return io.read("*L")
-  end
   history = history or {}
   local handler = history
   handler.hint = handler.hint or hint

src/main/resources/assets/opencomputers/loot/openos/lib/tty.lua

@@ -3,7 +3,6 @@ local event = require("event")
 local kb = require("keyboard")
 local component = require("component")
 local computer = require("computer")
-local process = require("process")
 local keys = kb.keys
 
 local tty = {}
@@ -19,11 +18,6 @@ tty.window =
 
 tty.internal = {}
 
-function tty.setReadHandler(handler)
-  checkArg(1, handler, "table")
-  process.info().data.handler = handler
-end
-
 function tty.key_down_handler(handler, cursor, char, code)
   local data = cursor.data
   local c = false
@@ -268,15 +262,17 @@ function tty.internal.build_vertical_reader()
 end
 
 -- read n bytes, n is unused
-function tty.read(_, handler, cursor)
+function tty.read(self, handler, cursor)
   checkArg(1, handler, "table", "number")
   checkArg(2, cursor, "table", "nil")
 
-  if type(handler) == "number" then
-    -- standard read as a stream, asking for n bytes
-    handler = process.info().data.handler or {}
+  if not io.stdin.tty or io.stdin.stream ~= self then
+    return io.stdin:readLine(false)
   end
 
+  if type(handler) ~= "table" then
+    handler = {}
+  end
   handler.index = 0
   cursor = cursor or tty.internal.build_vertical_reader()
 
@@ -324,7 +320,10 @@ function tty.setCursor(x, y)
   window.x, window.y = x, y
 end
 
-function tty.write(_, value)
+function tty.write(self, value)
+  if not io.stdout.tty or io.stdout.stream ~= self then
+    return io.write(value)
+  end
   local gpu = tty.gpu()
   if not gpu then
     return