public override void Execute()
{
base.Execute();
List <string> singleOptionList = HeadOptions.GetSingleOptions();
CommandLineOptions cloptions = CommandLineParser.Parse(Arguments.ToArray <string>(), singleOptionList.ToArray());
options = ParseOptions(cloptions);
CheckOptions(options);
if (options.IsSetHelp)
{
RaiseCommandLineUsage(this, HeadOptions.Usage);
}
else if (options.IsSetVersion)
{
RaiseCommandLineUsage(this, Version);
}
else
{
StartHead();
}
Terminate();
}
private static HeadCommandLineOptions ParseOptions(CommandLineOptions commandLineOptions)
{
if (commandLineOptions == null)
{
throw new CommandLineException(string.Format(CultureInfo.CurrentCulture,
"Option used in invalid context -- {0}", "must specify a option."));
}
HeadCommandLineOptions targetOptions = new HeadCommandLineOptions();
if (commandLineOptions.Arguments.Count >= 0)
{
foreach (var arg in commandLineOptions.Arguments.Keys)
{
HeadOptionType optionType = HeadOptions.GetOptionType(arg);
if (optionType == HeadOptionType.None)
{
throw new CommandLineException(
string.Format(CultureInfo.CurrentCulture, "Option used in invalid context -- {0}",
string.Format(CultureInfo.CurrentCulture, "cannot parse the command line argument : [{0}].", arg)));
}
switch (optionType)
{
case HeadOptionType.File:
targetOptions.IsSetFile = true;
targetOptions.File = commandLineOptions.Arguments[arg];
break;
case HeadOptionType.Number:
long outputLines = 0;
if (!long.TryParse(commandLineOptions.Arguments[arg], out outputLines))
{
throw new CommandLineException(string.Format(CultureInfo.CurrentCulture,
"Option used in invalid context -- {0}", "invalid output lines number."));
}
if (outputLines <= 0)
{
throw new CommandLineException(string.Format(CultureInfo.CurrentCulture,
"Option used in invalid context -- {0}", "invalid output lines number."));
}
targetOptions.Number = outputLines;
break;
case HeadOptionType.Help:
targetOptions.IsSetHelp = true;
break;
case HeadOptionType.Version:
targetOptions.IsSetVersion = true;
break;
}
}
}
if (commandLineOptions.Parameters.Count > 0)
{
if (!targetOptions.IsSetFile)
{
targetOptions.IsSetFile = true;
targetOptions.File = commandLineOptions.Parameters.First();
}
}
return(targetOptions);
}