A code searching tool similar to ack
, with a focus on speed.
I will be doing a public coding session on Saturday, October 26th at 1900UTC. That's noon Pacific Time. You can watch and chat at https://floobits.com/r/ggreer/the_silver_searcher/
- 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
.agignore
file. *cough* extern *cough* - The command name is 33% shorter than
ack
!
- 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.
I've written several blog posts showing how I've improved performance. These include how I added pthreads, wrote my own scandir()
, benchmarked every revision to find performance regressions, and profiled with gprof and Valgrind.
Gentoo:
emerge the_silver_searcher
OS X:
brew install the_silver_searcher
or
port install the_silver_searcher
ArchLinux:
pacman -S the_silver_searcher
FreeBSD:
Use either of the following commands depending on which package management tool your system is configured for:
pkg add the_silver_searcher
or
pkg_add the_silver_searcher
To build Ag from source on FreeBSD:
make -C /usr/ports/textproc/the_silver_searcher install clean
OpenBSD:
Use the following command to install from packages:
pkg_add the_silver_searcher
To build Ag from source on OpenBSD:
cd /usr/ports/textproc/the_silver_searcher && make install
If you want a CentOS rpm or Ubuntu deb, take a look at Vikram Dighe's packages.
Debian unstable:
apt-get install silversearcher-ag
Ubuntu 13.10 or later:
apt-get install silversearcher-ag
Ubuntu 13.04:
apt-get install software-properties-common # (if required)
apt-add-repository ppa:mizuno-as/silversearcher-ag
apt-get update
apt-get install silversearcher-ag
- Install dependencies (Automake, pkg-config, PCRE, LZMA):
-
Ubuntu:
apt-get install -y automake pkg-config libpcre3-dev zlib1g-dev liblzma-dev
-
CentOS:
yum -y groupinstall "Development Tools" yum -y install pcre-devel xz-devel
-
OS X:
-
Windows: It's complicated. See this wiki page.
-
- Run the build script (which just runs aclocal, automake, etc):
./build.sh
- Make install:
sudo make install
On windows:
mingw32-make -f Makefile.w32
It's quite stable now. Most changes are new features, minor bug fixes, or performance improvements. It's much faster than Ack in my benchmarks.
ack blahblahblah ~/code 6.59s user 1.94s system 99% cpu 8.547 total
ag blahblahblah ~/code 1.39s user 1.81s system 229% cpu 1.396 total
TextMate users can use Ag with my fork of the popular AckMate plugin, which lets you use both Ack and Ag for searching. If you already have AckMate you just want to replace Ack with Ag, move or delete "~/Library/Application Support/TextMate/PlugIns/AckMate.tmplugin/Contents/Resources/ackmate_ack"
and run ln -s /usr/local/bin/ag "~/Library/Application Support/TextMate/PlugIns/AckMate.tmplugin/Contents/Resources/ackmate_ack"
You can use Ag with [ack.vim][] by adding the following line to your .vimrc
:
let g:ackprg = 'ag --nogroup --nocolor --column'
There's also a fork of ack.vim tailored for use with Ag: [ag.vim][] [ack.vim]: https://github.com/mileszs/ack.vim [ag.vim]: https://github.com/rking/ag.vim
You can use use ag.el as an Emacs fronted to Ag.
I like when people send pull requests. It validates my existence. If you want to help out, check the issue list or search the codebase for TODO
. Don't worry if you lack experience writing C. If I think a pull request isn't ready to be merged, I'll give feedback in comments. Once everything looks good, I'll comment on your pull request with a cool animated gif and hit the merge button.
A special thanks goes out to Alex Davies. He has given me some excellent recommendations to improve Ag. Many of these things are still on my list:
- Optimizations
- Profile
read()
againstmmap()
. Remember that'sread()
notfread()
. - Write a benchmarking script that tweaks various settings to find what's fastest.
- Profile
- Features
- Behave better when matching in files with really long lines.
- Report "match found at position X of line N" if line is > 10k chars.
- Windows support
readdir()
andstat()
are much slower on Windows. UseFindNextFile()
instead.- Support Visual Studio instead of autotools?
- Need to use pthreads-win32 or something similar.
- Ack - Better than grep
- AckMate - An ack-powered replacement for TextMate's slow built-in search.
- ack.vim
- ag.vim
- Exuberant Ctags - Faster than Ag, but it builds an index beforehand. Good for really big codebases.
- Git-grep - As fast as Ag but only works on git repos.
- Sack - A utility that wraps Ack and Ag. It removes a lot of repetition from searching and opening matching files.