File Selection Language 0.5.1

File Selection Language (FSL) is a descriptive language for file selection. File Selection Language is used to selectively pick files from a directory structure.
FSL is useful for selective backups, for instance. FSL uses glob patterns as the basic building block.
For fine-tuning the selection, inclusion/exclusion rule combinations and conditional expressions are available. File size and modification date can be used in expressions.
Main features:
- FSL can be used with a command line tool (fsltool) or, for Python programmers, with a programmable interface. For the Python interface, see the documentation of Interpreter.py.
- Several FSL rule files can be combined in a cascading manner similar to CSS. The effect is the same as if the rule files were pasted into a single file.
- Support for both Windows-like and Unix-like paths.
- Strict parse-time type checking to catch as many errors as possible before run-time. For example, you cant say EACH f IF size(5) > 1000 because function size expects filename argument.