public static bool TryGetRollingFrequency(string pathTemplate, out RollingFrequency specifier)
{
if (pathTemplate == null)
{
throw new ArgumentNullException(nameof(pathTemplate));
}
var frequencies = new[] { Date, Hour }.Where(s => pathTemplate.Contains(s.Name)).ToArray();
specifier = frequencies.LastOrDefault();
return(specifier != null);
}
// Rolls files based on the current date, using a path formatting pattern like: Logs/log-{Date}.txt
public RollingFilePath(string pathTemplate)
{
if (pathTemplate == null)
{
throw new ArgumentNullException(nameof(pathTemplate));
}
var filenameTemplate = Path.GetFileName(pathTemplate);
if (!RollingFrequency.TryGetRollingFrequency(filenameTemplate, out _frequency))
{
_frequency = RollingFrequency.Date;
filenameTemplate = Path.GetFileNameWithoutExtension(filenameTemplate) + DefaultSeparator +
_frequency.Name + Path.GetExtension(filenameTemplate);
}
var indexOfSpecifier = filenameTemplate.IndexOf(_frequency.Name, StringComparison.Ordinal);
var prefix = filenameTemplate.Substring(0, indexOfSpecifier);
var suffix = filenameTemplate.Substring(indexOfSpecifier + _frequency.Name.Length);
_filenameMatcher = new Regex(
"^" +
Regex.Escape(prefix) +
"(?<" + SpecifierMatchGroup + ">\\d{" + _frequency.Format.Length + "})" +
"(?<" + SequenceNumberMatchGroup + ">_[0-9]{3,}){0,1}" +
Regex.Escape(suffix) +
"$");
FileSearchPattern = filenameTemplate.Replace(_frequency.Name, "*");
var directory = Path.GetDirectoryName(pathTemplate);
if (string.IsNullOrEmpty(directory))
{
directory = Directory.GetCurrentDirectory();
}
else
{
directory = Path.GetFullPath(directory);
}
LogFileDirectory = directory;
_pathTemplate = Path.Combine(LogFileDirectory, filenameTemplate);
}