IO.gets and IO.getb now return binaries when reading from stdio

Author: José Valim

CHANGELOG.md

@@ -20,6 +20,7 @@
   * [Kernel] `List.member?/2` is deprecated in favor of `Enum.member?/2`
 
 * backwards incompatible changes
+  * [Kernel] `IO.gets` and `IO.getb` now return binaries when reading from stdio
   * [Mix] `mix escriptize` now receives arguments as binaries
 
 # v0.8.2 (2013-04-20)

lib/elixir/lib/io.ex

@@ -157,7 +157,20 @@ defmodule IO do
     for instance {:error, :estale} if reading from an
     NFS file system.
   """
-  def getb(device // group_leader(), prompt, count // 1) do
+  def getb(prompt, count // 1)
+
+  def getb(prompt, count) when is_integer(count) do
+    getb(group_leader, prompt, count)
+  end
+
+  def getb(device, prompt) do
+    getb(device, prompt, 1)
+  end
+
+  @doc """
+  Gets `count` bytes from the chosen IO device.
+  """
+  def getb(device, prompt, count) do
     :io.get_chars(map_dev(device), to_iodata(prompt), count)
   end
 

lib/elixir/src/elixir.erl

@@ -20,8 +20,8 @@ start(_Type, _Args) ->
   %% Set the shell to unicode so printing inside scripts work
   %% Those can take a while, so let's do it in a new process
   spawn(fun() ->
-    io:setopts(standard_io, [{encoding,unicode}]),
-    io:setopts(standard_error, [{encoding,unicode}])
+    io:setopts(standard_io, [binary,{encoding,unicode}]),
+    io:setopts(standard_error, [binary,{encoding,unicode}])
   end),
   elixir_sup:start_link([]).
 

lib/iex/lib/iex.ex

@@ -114,7 +114,7 @@ defmodule IEx do
       expand_fun = IEx.Autocomplete.expand &1
     end
 
-    :io.setopts gl, [expand_fun: expand_fun]
+    :io.setopts gl, [expand_fun: expand_fun, binary: true]
   end
 
   defp ensure_module_exists(node, mod) do