ack -hc 'pattern'

[ENHANCEMENTS]
Include .cljs, .cljc and .edn files with the --clojure filetype. Thanks,
Austin Chamberlin.

Added .xsd to the --xml filetype. Thanks, Nick Morrott.

Added support for Swift language. Thanks, Nikolaj Schumacher. (GH #512))

The MSYS2 project is now seen as Windows. Thanks, Ray Donnelly. (GH #450))

Expand the definition of OCaml files. Thanks, Marek Kubica. (GH #511))

Add support for Groovy Server Pages. Thanks, Ethan Mallove. (GH #469))

The JSP filetype (--jsp) now recognizes .jspf files. Thanks, Sebastien
Feugere. (GH #586))

Added --hpp option for C++ header files. Thankis, Steffen Jaeckel.

ack now supports --ignore-dir=match:.... Thanks, Ailin Nemui! (GitHub ticket #42))

ack also supports --ignore-dir=ext:..., and --noignore-dir supports match/ext as well