Description:

An attempt to make something better than ack (which itself is better
than grep).

Why use Ag?
- It searches code about 3–5× faster than ack.
- It ignores file patterns from your .gitignore and .hgignore.
- If there are files in your source repo you don't want to search,
just add their patterns to a .ignore file. *cough* extern *cough*
- The command name is 33% shorter than ack!

How is it so fast?
- Searching for literals (no regex) uses Boyer-Moore-Horspool strstr.
- Files are mmap()ed instead of read into a buffer.
- If you're building with PCRE 8.21 or greater, regex searches use the
JIT compiler.
- Ag calls pcre_study() before executing the regex on a jillion files.
- Instead of calling fnmatch() on every pattern in your ignore files,
non-regex patterns are loaded into an array and binary searched.
- Ag uses Pthreads to take advantage of multiple CPU cores and search
files in parallel.