$pseditor.GetEditorContext().CurrentFile.GetTextLines() throws on Untitled (never saved) file

[rkeithhill]

System Details

Windows 10 CU
VSCode 1.12.2
Extension 1.2.0
PS 5.1.15063.296

Issue Description

This is the error I get in the PSIC:

PowerShell Integrated Console

~\Documents\WindowsPowerShell
1:74ms>

A terminating error occurred in PowerShell Editor Services:

One or more errors occurred.
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.ProtocolEndpoint.WaitForExit()
   at CallSite.Target(Closure , CallSite , Object )
One or more errors occurred.

Could not find file 'C:\Users\hillr\Documents\WindowsPowerShell\Untitled-1'.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize,
 FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
   at Microsoft.PowerShell.EditorServices.Workspace.GetFile(String filePath)
   at Microsoft.PowerShell.EditorServices.Protocol.Server.LanguageServerEditorOperations.ConvertClientEditorContext(ClientEditorContext clientCont
ext)
   at Microsoft.PowerShell.EditorServices.Protocol.Server.LanguageServer.HandleInvokeExtensionCommandRequest(InvokeExtensionCommandRequest command
Details, RequestContext`1 requestContext)
   at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.MessageDispatcher.<>c__DisplayClass3_0`4.<SetRequestHandler>b__0(Message reques
tMessage, MessageWriter messageWriter)
   at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.MessageDispatcher.<DispatchMessage>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.ProtocolEndpoint.<ListenForMessages>d__47.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.PowerShell.EditorServices.Utility.AsyncContext.Start(Func`1 asyncMainFunc)
   at System.Threading.Tasks.Task.Execute()

It might actually be failing on accessing CurrentFile.

Here are the contents of my Microsoft.VSCode_profile.ps1 file:

# Lame semicolon remover - doesn't understand here strings or comments
function Remove-TrailingSemicolon {
    param(
        [Parameter()]
        [Microsoft.PowerShell.EditorServices.Extensions.EditorContext]
        $editorContext = $psEditor.GetEditorContext()
    )

    $currentFile = $editorContext.CurrentFile;
    $lines = $currentFile.GetTextLines();
    for ($i = 0; $i -lt $lines.Count; $i++) {
        $line = $lines[$i]
        if ($line -match '^(.*?);(\s*)$') {
            $startCol = $matches[1].Length + 1
            $currentFile.InsertText(' ', $i+1, $startCol, $i+1, $startCol+1)
        }
    }
}

$params = @{
    Name = 'KH.RemoveUnnecessarySemicolons'
    DisplayName = 'Remove unnecessary semicolons'
    Function = 'Remove-TrailingSemicolon'
    SuppressOutput = $true
}

Register-EditorCommand @params

Attached Logs

5/31/2017 4:35:21 PM [VERBOSE] - Method "ReadMessage" at line 111 of C:\projects\powershelleditorservices\src\PowerShellEditorServices.Protocol\MessageProtocol\MessageReader.cs

    READ MESSAGE:
    
    {
      "jsonrpc": "2.0",
      "id": 17,
      "method": "powerShell/invokeExtensionCommand",
      "params": {
        "name": "KH.RemoveUnnecessarySemicolons",
        "context": {
          "currentFilePath": "Untitled-1",
          "cursorPosition": {
            "line": 9,
            "character": 0
          },
          "selectionRange": {
            "start": {
              "line": 9,
              "character": 0
            },
            "end": {
              "line": 9,
              "character": 0
            }
          }
        }
      }
    }

5/31/2017 4:35:21 PM [VERBOSE] - Method "ResolveFilePath" at line 316 of C:\projects\powershelleditorservices\src\PowerShellEditorServices\Workspace\Workspace.cs

    Resolved path: C:\Users\hillr\Documents\WindowsPowerShell\Untitled-1

5/31/2017 4:35:21 PM [ERROR] - Method "OnListenTaskCompleted" at line 494 of C:\projects\powershelleditorservices\src\PowerShellEditorServices.Protocol\MessageProtocol\ProtocolEndpoint.cs

    MessageDispatcher loop terminated due to unhandled exception:
    
    System.AggregateException: One or more errors occurred. ---> System.IO.FileNotFoundException: Could not find file 'C:\Users\hillr\Documents\WindowsPowerShell\Untitled-1'.
       at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
       at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
       at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
       at Microsoft.PowerShell.EditorServices.Workspace.GetFile(String filePath)
       at Microsoft.PowerShell.EditorServices.Protocol.Server.LanguageServerEditorOperations.ConvertClientEditorContext(ClientEditorContext clientContext)
       at Microsoft.PowerShell.EditorServices.Protocol.Server.LanguageServer.HandleInvokeExtensionCommandRequest(InvokeExtensionCommandRequest commandDetails, RequestContext`1 requestContext)
       at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.MessageDispatcher.<>c__DisplayClass3_0`4.<SetRequestHandler>b__0(Message requestMessage, MessageWriter messageWriter)
       at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.MessageDispatcher.<DispatchMessage>d__6.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.ProtocolEndpoint.<ListenForMessages>d__47.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at Microsoft.PowerShell.EditorServices.Utility.AsyncContext.Start(Func`1 asyncMainFunc)
       at System.Threading.Tasks.Task.Execute()
       --- End of inner exception stack trace ---
    ---> (Inner Exception #0) System.IO.FileNotFoundException: Could not find file 'C:\Users\hillr\Documents\WindowsPowerShell\Untitled-1'.
    File name: 'C:\Users\hillr\Documents\WindowsPowerShell\Untitled-1'
       at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
       at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
       at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
       at Microsoft.PowerShell.EditorServices.Workspace.GetFile(String filePath)
       at Microsoft.PowerShell.EditorServices.Protocol.Server.LanguageServerEditorOperations.ConvertClientEditorContext(ClientEditorContext clientContext)
       at Microsoft.PowerShell.EditorServices.Protocol.Server.LanguageServer.HandleInvokeExtensionCommandRequest(InvokeExtensionCommandRequest commandDetails, RequestContext`1 requestContext)
       at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.MessageDispatcher.<>c__DisplayClass3_0`4.<SetRequestHandler>b__0(Message requestMessage, MessageWriter messageWriter)
       at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.MessageDispatcher.<DispatchMessage>d__6.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.ProtocolEndpoint.<ListenForMessages>d__47.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at Microsoft.PowerShell.EditorServices.Utility.AsyncContext.Start(Func`1 asyncMainFunc)
       at System.Threading.Tasks.Task.Execute()<---