private static FileExistsAssertionResult AssertFileExists(TailOptions options)
{
if (!options.Filename.Any()) return new FileExistsAssertionResult {AssertionFailedReason = "You must specify a file to tail"};
var fileName = options.Filename.First();
if (!File.Exists(fileName)) return new FileExistsAssertionResult
{ AssertionFailedReason =
$"{fileName} does not exist"
};
return new FileExistsAssertionResult { FileExists = true };
}
private static void StartFileWatch(TailOptions options)
{
if (options.Version) SpitVersionInfoAndExit();
var conf = TailOptionsToFileWatchConfiguration(options);
ISleeper sleeper = new ThreadSleeper();
IStreamReader streamReader = new TailStreamReader(conf.FileName);
TailWatcherProxy.StartWatcher(TailWatcherProxy.WatcherType.File, conf, streamReader, sleeper);
}
private static FileWatchConfiguration TailOptionsToFileWatchConfiguration(TailOptions options)
{
var assertionResult = AssertFileExists(options);
if (!assertionResult.FileExists)
{
System.Console.WriteLine(assertionResult.AssertionFailedReason);
Environment.Exit(0);
}
var conf = new FileWatchConfiguration
{
PollIntervalInMs = (int) options.SleepIntervalInSeconds*1000,
Observer = new ConsoleObserver(),
FileName = options.Filename.First(),
NumberOfLinesToOutputWhenWatchingStarts = options.Lines
};
if (!string.IsNullOrWhiteSpace(options.InclusionFilter))
{
conf.WatchFilter = new WatchFilter
{
InclusionFilter = new Filter
{
SimpleFilter = options.InclusionFilter
}
};
}
if (!string.IsNullOrWhiteSpace(options.ExclusionFilter))
{
conf.WatchFilter = new WatchFilter
{
ExclusionFilter = new Filter
{
SimpleFilter = options.ExclusionFilter
}
};
}
return conf;
}