ack 2.0

ack 2.0 needs lots of stuff.

Design rules to keep in mind.

High-level outline

Definitely

• Framework for plugins
• More flexible way to specify filetypes
• Profiles for assigning groups of filetypes
• Definitive vocabulary for define what is a "filetype" and "extension" and whatever
• Regex filetypes detection

Maybe

• API for calling from programs