/// <summary>
/// Configures this command by hooking up the input setup and the execution callback.
/// </summary>
private void ConfigureInternal()
{
this.m_commandLineApplication.Command(
this.CommandName,
(subCommandLineApplication) =>
{
// This callback is called by the CommandLineUtils library to configure description/inputs,
// and handle the exeuction logic
subCommandLineApplication.Description = this.CommandDescription;
CommandOption helpOption = subCommandLineApplication.Option(
CLIApplication.HelpOptionSwitches,
CLIApplication.HelpDescriptionText,
CommandOptionType.NoValue);
ConfiguredInputs configuredInputs = this.SetupInputs(subCommandLineApplication);
subCommandLineApplication.OnExecute(() =>
{
int exitCode = 1;
// Display help information and return the appropriate exit code if either no inputs
// where passed to a command that expects inputs, or a command parsing error occurred
try
{
configuredInputs.ValidateInputs(subCommandLineApplication);
configuredInputs.ValidateAllInputs?.Invoke();
}
catch (Exception ex)
{
exitCode = this.OnInputValidationError(ex);
subCommandLineApplication.ShowHelp();
return(exitCode);
}
try
{
if (helpOption.HasValue())
{
Console.Write($"{this.CommandName}\t{this.CommandDescription}");
subCommandLineApplication.ShowHelp();
return(0);
}
// Execute the pre-execution routine if it is set
if (this.m_onPreExecute != null)
{
this.m_onPreExecute();
}
exitCode = this.OnExecute(configuredInputs);
}
catch (CommandParsingException exp)
{
// This will get invoked if the "command" part is not successfully parsed
Console.Error.Write(exp.Message);
subCommandLineApplication.ShowHelp();
exitCode = 1;
}
return(exitCode);
});
});
}
/// <summary>
/// Executes the CLI application. Handles all exceptions and returns appropriate exit code
/// </summary>
/// <param name="args">The inputs to the program</param>
/// <returns>Return 0 if the function succeeded, other value if failed</returns>
public int Execute(string[] args)
{
int exitCode = 1;
try
{
ConfiguredInputs configuredInputs = null;
if (this.SetupInputs != null)
{
configuredInputs = this.SetupInputs.Invoke(this.m_commandLineApplication);
}
this.m_commandLineApplication.OnExecute(() =>
{
if (this.m_versionOption.HasValue())
{
Console.WriteLine(this.m_versionString);
return(0);
}
else if (this.m_helpOption.HasValue())
{
this.ShowHelp();
return(0);
}
if (configuredInputs != null)
{
try
{
configuredInputs.ValidateInputs(this.m_commandLineApplication);
}
catch (Exception exp)
{
if (this.OnInputValidationError != null)
{
exitCode = this.OnInputValidationError.Invoke(exp);
}
else
{
// This can happen if caller doesn't want to use OnInputValidationError - and so
// CLIApplication will default to just returning 1 as the exit code
Console.Error.WriteLine("Error: {0}", exp.Message);
exitCode = 1;
}
this.ShowHelp();
return(exitCode);
}
if (this.OnExecute != null)
{
return(this.OnExecute.Invoke(configuredInputs));
}
else
{
this.ShowHelp();
return(1);
}
}
else
{
this.ShowHelp();
return(1);
}
});
exitCode = this.m_commandLineApplication.Execute(args);
}
catch (CommandParsingException exp)
{
// This will get invoked if the "command" part is not successfully parsed
Console.Error.WriteLine(exp.Message);
this.m_commandLineApplication.ShowHelp();
exitCode = 1;
}
return(exitCode);
}
/// <summary> /// Method that gets invoked when this command is being executed with validated inputs. /// Must be implemented by the concreted derived classes. /// Note: This method must handle all exceptions and return appropriate exit code for the program. /// </summary> /// <param name="configuredInputs">The validated inputs</param> /// <returns>The program exit code</returns> protected abstract int OnExecute(ConfiguredInputs configuredInputs);