Description:

Grin is a tool for searching through directories full of source code. Although
similar to grep, it has a number of unique features:

* Recurse directories by default.
* Do not go into directories with specified names.
* Do not search files with specified extensions.
* Be able to show context lines before and after matched lines.
* Python regex syntax.
* Unless suppressed via a command line option, display the filename regardless
of the number of files.
* Accept a file (or stdin) with a list of newline-separated filenames.
* Grep through gzipped text files.
* Be useful as a library to build custom tools quickly.