_ackrc

--color
--sort-files
--smart-case

--ignore-dir=.git
--ignore-dir=.bundle
--ignore-dir=coverage

--type-set=CTAGS=.tags
--noCTAGS
--type-set=CSCOPE=.out
--noCSCOPE
--type-set=PYC=.pyc
--noPYC

#make sure ack knows how to search common filetypes used in rails projects
--type-add=css=scss
--type-add=ruby=.haml,.rselm,.feature,.ru,.lock
--type-set=coffeescript=.coffee
--type-set=coffee=.coffee
 
#make sure ack knows how to search common filetypes used in node.js projects
 --ignore-dir=node_modules
 --type-set=coffee=.coffee
 --type-set=jade=.jade
 --type-set=feature=.feature
 --type-set=json=.json