FromContext extracts Logger from context and returns itself otherwise, creates default one logger.

GetFileLineHook prepares and returns filename line hook.

GetLogger is a Logger getter with default settings.

WithContext puts logger to the context.

DefaultFileNameLineKey is a field name in a logged record.

PathLen is a count of the directories to log, including file itself.

StartDepth is a depth of stack trace, because of log-wrapper, which is used here this start depth is required to find caller correctly.

FileLineHook contains caller's log settings.

Logger interface.

Fields is a wrapper around logrus.Field.