Paste data into Mathematica with formatting

As Mr.Wizard showed me here. You use UndocumentedTestFEParserPacket to print the pasted data. For example:

FixSpacesAndLineBreaksFormatting[t_] := (StringReplace[t, {
     RegularExpression["^[ ]+$"] -> "",
     "\n" -> "\[IndentingNewLine]"}]);

CellPrint@Cell[
  Replace[
   First@FrontEndExecute@UndocumentedTestFEParserPacket[
      Catch[NotebookGet@ClipboardNotebook[]
        /. Cell[r_, ___] :> Block[{}, Throw[r, tag] /; True];
       $Failed, tag]
      , False]
   , t_String :> FixSpacesAndLineBreaksFormatting[t], Infinity]
  , "Input"]

If you want a shortcut you can run the following to assign it to Ctrl+Shift+V as described here.

FixSpacesAndLineBreaksFormatting[t_] := (StringReplace[t, {
     RegularExpression["^[ ]+$"] -> "",
     "\n" -> "\[IndentingNewLine]"}]);

FrontEndExecute[
 FrontEnd`AddMenuCommands[
  "DuplicatePreviousOutput", {Delimiter,
   MenuItem["Raw Paste Clipboard",
    FrontEnd`KernelExecute[NotebookWrite[InputNotebook[],
      Replace[
       First@FrontEndExecute@UndocumentedTestFEParserPacket[
          Catch[NotebookGet@ClipboardNotebook[]
            /. Cell[r_, ___] :> Block[{}, Throw[r, tag] /; True];
           $Failed, tag]
          , False]
       , t_String :> FixSpacesAndLineBreaksFormatting[t], Infinity]
      ]], MenuKey["v", Modifiers -> {"Control", "Shift"}],
    System`MenuEvaluator -> Automatic]}]]

Or do the add the following to KeyEventTranslations as described here. EDIT: This doesn't seem to be working currently and advised fix would be great. You can the put the AddMenuCommands in init.m as workaround.

As a start we can create a basic paste function using the ClipboardNotebook as follows:

pasteRaw[] :=
 NotebookGet[ClipboardNotebook[]] /.
  Notebook[{Cell[BoxData[data_] | data_, ___]}, ___] :>
   (CellPrint[Cell[BoxData[data], "Input"]];)

After copying the desired text you can evaluate pasteRaw[] to paste it as input. At present no syntax checking is done and you will get an error box if the input is invalid or incomplete.