protected string RenderScriptValue(PSObject inputObject,
ScriptBlock script,
bool dontGroupMultipleResults)
{
// Let the script also use context created by the custom header script (if any).
if (m_preservedScriptContext != null)
{
script = m_preservedScriptContext.NewBoundScriptBlock(script);
}
#if DEBUG
sm_renderScriptCallDepth++;
if (sm_renderScriptCallDepth > 10)
{
// Helps to catch runaway rendering /before/ gobbling tons of memory
System.Diagnostics.Debugger.Break();
// Maybe I should just throw?
}
#endif
using (DbgProvider.LeaseShell(out PowerShell shell))
{
//
// script.InvokeWithContext is a lot nicer-looking. But the problem with
// it is that non-terminating errors don't go to the output or an easily
// checked buffer, and I'd prefer that no errors get hidden. Strangely,
// calling script.InvokeWithContext directly in
// InvokeScriptCommand.InvokeWithContext does send the errors down the
// pipeline to be displayed. I don't know what is making the difference.
//
// Things to try with both methods:
//
// $ctx = $null
// $savedCtx = $null
// Invoke-Script -ScriptBlock { "hi" ; Write-Error "non-term" ; "bye" } -WithContext $ctx
//
// { "hi" ; Write-Error "non-term" ; "bye" }.InvokeWithContext( @{}, @() )
//
// $tmpMod = New-Module { }
// $scriptBlockWithDifferentExecCtx = & $tmpMod { { "hi" ; Write-Error "non-term" ; "bye" } }
// $scriptBlockWithDifferentExecCtx.InvokeWithContext( @{}, @() )
//
// Register-AltTypeFormatEntries { New-AltTypeFormatEntry -TypeName 'System.Int32' { New-AltCustomViewDefinition { "It's an int: $_" ; Write-Error "this is non-terminating" ; "done" } } }
// 42
//
Collection <PSObject> results;
try
{
// Note that StrictMode will be enforced for value converters, because
// they execute in the scope of Debugger.Formatting.psm1, which sets
// StrictMode.
InvokeCommand.InvokeScript(false, sm_pipeIndexScript, null, m_pipeIndex);
var info = InvokeCommand.GetCmdlet("ForEach-Object");
shell.AddCommand(info).AddParameter("Process", script);
results = shell.Invoke(new[] { inputObject });
}
catch (RuntimeException e)
{
// Make the error available for inspection:
AddToError(Util.FixErrorRecord(e.ErrorRecord, e));
return(new ColorString(ConsoleColor.Red,
Util.Sprintf("<Error: {0}>", e))
.ToString(DbgProvider.HostSupportsColor));
}
#if DEBUG
sm_renderScriptCallDepth--;
#endif
// For some reason, sometimes shell.HadErrors returns true when
// shell.Streams.Error.Count is 0, when the pipeline is stopping.
if (Stopping)
{
return(String.Empty);
}
// INT2d518c4b: shell.HadErrors is clueless.
//if( shell.HadErrors )
if (shell.Streams.Error.Count > 0)
{
// (don't need to call AddToError explicitly; they will already be
// available in $error)
if (1 == shell.Streams.Error.Count)
{
return(new ColorString(ConsoleColor.Red,
Util.Sprintf("<Error: {0}>",
shell.Streams.Error[0]))
.ToString(DbgProvider.HostSupportsColor));
}
else
{
return(new ColorString(ConsoleColor.Red,
Util.Sprintf("<Multiple errors ({0}) encountered>",
shell.Streams.Error.Count))
.ToString(DbgProvider.HostSupportsColor));
}
}
else
{
if ((null == results) || (0 == results.Count))
{
return(null);
}
return(ObjectsToMarkedUpString(results,
"{0}", // <-- IMPORTANT: this prevents infinite recursion via Format-AltSingleLine
null,
dontGroupMultipleResults).ToString());
} // end else( no errors )
} // end using( shell lease )
} // end RenderScriptValue()