public override void Execute()
{
base.Execute();
List <string> singleOptionList = TailOptions.GetSingleOptions();
CommandLineOptions options = CommandLineParser.Parse(Arguments.ToArray <string>(), singleOptionList.ToArray());
tailOptions = ParseOptions(options);
if (tailOptions.IsSetHelp)
{
RaiseCommandLineUsage(this, TailOptions.Usage);
Terminate();
}
else if (tailOptions.IsSetVersion)
{
RaiseCommandLineUsage(this, TailOptions.Version);
Terminate();
}
else
{
StartWatch();
}
}
private static TailCommandLineOptions ParseOptions(CommandLineOptions options)
{
if (options == null)
{
throw new CommandLineException(string.Format(CultureInfo.CurrentCulture,
"Option used in invalid context -- {0}", "must specify a option."));
}
TailCommandLineOptions targetOptions = new TailCommandLineOptions();
if (options.Arguments.Count > 0)
{
foreach (var arg in options.Arguments.Keys)
{
TailOptionType optionType = TailOptions.GetOptionType(arg);
if (optionType == TailOptionType.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 TailOptionType.Retry:
targetOptions.IsSetRetry = true;
break;
case TailOptionType.Follow:
targetOptions.IsSetFollow = true;
targetOptions.File = options.Arguments[arg];
break;
case TailOptionType.FollowRetry:
targetOptions.IsSetFollow = true;
targetOptions.IsSetRetry = true;
targetOptions.File = options.Arguments[arg];
break;
case TailOptionType.OutputLines:
long outputLines = 0;
if (!long.TryParse(options.Arguments[arg], out outputLines))
{
throw new CommandLineException(string.Format(CultureInfo.CurrentCulture,
"Option used in invalid context -- {0}", "invalid output lines option value."));
}
if (outputLines <= 0)
{
throw new CommandLineException(string.Format(CultureInfo.CurrentCulture,
"Option used in invalid context -- {0}", "invalid output lines option value."));
}
targetOptions.OutputLines = outputLines;
break;
case TailOptionType.SleepInterval:
long sleepInterval = 0;
if (!long.TryParse(options.Arguments[arg], out sleepInterval))
{
throw new CommandLineException(string.Format(CultureInfo.CurrentCulture,
"Option used in invalid context -- {0}", "invalid sleep interval option value."));
}
if (sleepInterval <= 0)
{
throw new CommandLineException(string.Format(CultureInfo.CurrentCulture,
"Option used in invalid context -- {0}", "invalid sleep interval option value."));
}
targetOptions.SleepInterval = sleepInterval;
break;
case TailOptionType.Help:
targetOptions.IsSetHelp = true;
break;
case TailOptionType.Version:
targetOptions.IsSetVersion = true;
break;
}
}
}
if (!targetOptions.IsSetHelp && !targetOptions.IsSetVersion)
{
if (string.IsNullOrEmpty(targetOptions.File))
{
if (options.Parameters.Count <= 0)
{
throw new CommandLineException(string.Format(CultureInfo.CurrentCulture,
"Option used in invalid context -- {0}", "must follow a file."));
}
if (options.Parameters.Count > 1)
{
throw new CommandLineException(string.Format(CultureInfo.CurrentCulture,
"Option used in invalid context -- {0}", "can only follow one file."));
}
targetOptions.File = options.Parameters.First();
}
else
{
if (options.Parameters.Count > 0)
{
throw new CommandLineException(string.Format(CultureInfo.CurrentCulture,
"Option used in invalid context -- {0}", "can only follow one file."));
}
}
if (targetOptions.IsSetRetry && !targetOptions.IsSetFollow)
{
throw new CommandLineException(string.Format(CultureInfo.CurrentCulture,
"Option used in invalid context -- {0}", "keep trying to open a file should follow a file name explicitly."));
}
}
return(targetOptions);
}