fileset: extract language processing part to new module (API)
I'll add a couple more functions that work on parsed tree.
% wc -l mercurial/fileset*.py
559 mercurial/fileset.py
135 mercurial/filesetlang.py
694 total
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false