/// <summary>
/// Invokes the next step in the step sequence.
/// </summary>
public bool MoveNext()
{
AssumeCanStep();
_current = null;
try
{
// this is running
_RunningInstance = this;
// done with steps?
if (_StepIndex >= _steps.Count)
{
// event
UnitCompleted?.Invoke(this, null);
// remove user data
if (_Data != null)
{
_Data.Clear();
}
// done with units?
if (++_UnitIndex >= _units.Count)
{
// state
State = StepperState.Completed;
_continuation?.Invoke(null);
return(false);
}
// state
State = StepperState.Loading;
// reset steps
_steps.Clear();
_StepIndex = 0;
// get steps from the unit
Collection <PSObject> steps;
var path = _units[_UnitIndex];
using (var ps = A.Psf.NewPowerShell())
steps = ps.AddCommand(path).Invoke();
// no steps? 'continue'
if (steps.Count == 0)
{
return(true);
}
// add steps and start
InsertRange(0, steps);
}
// state
State = StepperState.Stepping;
// counter
++_StepCount;
// next step object
object it = _steps[_StepIndex];
if (it == null)
{
Throw("Step is null.");
}
// show
if (Ask)
{
string text = it.ToString();
string title = "Step " + (_StepIndex + 1) + "/" + _steps.Count;
if (_units.Count > 0)
{
if (_UnitIndex >= 0)
{
text = _units[_UnitIndex].ToString().Trim() + "\r" + text;
}
title += " Unit " + (_UnitIndex + 1) + "/" + _units.Count;
}
var args = new MessageArgs()
{
Text = text,
Caption = title,
Options = MessageOptions.LeftAligned,
Buttons = new string[] { "Step", "Continue", "Cancel" },
Position = new Point(int.MaxValue, 1)
};
switch (Far.Api.Message(args))
{
case 0:
break;
case 1:
Ask = false;
break;
default:
return(false);
}
}
// invoke the next step
ScriptBlock block = Cast <ScriptBlock> .From(it);
if (block != null)
{
// invoke the step script
Collection <PSObject> result = null;
try
{
result = block.Invoke();
}
catch (RuntimeException ex)
{
Throw(block, "Step failed: " + ex.Message, ex);
}
// extra script, normally starts modal UI
ScriptBlock script;
if (result.Count == 1 && null != (script = result[0].BaseObject as ScriptBlock))
{
++_StepIndex;
_current = new Action(delegate { script.Invoke(); });
return(true);
}
// unexpected output
if (result.Count != 0)
{
Throw(block, string.Format(null,
"Unexpected step output: {0} item(s): [{1}]...",
result.Count, TypeName(result[0])), null);
}
}
else
{
// post macro
_current = it;
}
// post
++_StepIndex;
return(true);
}
catch (Exception error)
{
_Error = error;
State = StepperState.Failed;
if (_continuation == null)
{
throw;
}
_continuation(error);
return(false);
}
finally
{
// step is over
_RunningInstance = null;
}
}
