Livegrep is a tool, partially inspired by Google Code Search, for interactive regex search of ~gigabyte-scale source repositories. You can see a running instance at http://livegrep.com/.
livegrep builds using bazel. You will need to install bazel version 0.3 or newer. livegrep vendors and/or fetches all of its dependencies using
bazel, and so should only require a relatively recent C++ compiler to build.
Once you have those dependencies, you can build using
bazel build //...
Note that the initial build will download around 100M of dependencies. These will be cached once downloaded.
livegrep, you need to invoke both the
codesearch backend index/search process, and the
livegrep web interface.
To run the sample web interface over livegrep itself, once you have built both
In one terminal, start the
codesearch server like so:
bazel-bin/src/tools/codesearch -grpc localhost:9999 doc/examples/livegrep/index.json
In another, run livegrep:
In a browser, now visit http://localhost:8910/, and you should see a working livegrep.
Using Index Files
codesearch binary is responsible for reading source code, maintaining an index, and handling searches.
livegrep is stateless and relies only on the connection to
codesearch over a TCP connection.
codesearch will build an in-memory index over the repositories specified in its configuration file. You can, however, also instruct it to save the index to a file on disk. This the dual advantages of allowing indexes that are too large to fit in RAM, and of allowing an index file to be reused. You instruct
codesearch to generate an index file via the
-dump_index flag and to not launch a search server via the
bazel-bin/src/tools/codesearch -index_only -dump_index livegrep.idx doc/examples/livegrep/index.json
codeseach has built the index, this index file can be used for future runs. Index files are standalone, and you no longer need access to the source code repositories, or even a configuration file, once an index has been built. You can just launch a search server like so:
bazel-bin/src/tools/codesearch -load_index livegrep.idx -grpc localhost:9999
livegrep frontend expects an optional position argument indicating a JSON configuration file; See doc/examples/livegrep/server.json for an example, and server/config/config.go for documentation of available options.
livegrep will connect to a single local codesearch instance on port
9999, and listen for HTTP connections on port
livegrep includes a helper driver,
livegrep-github-reindex, which can automatically update and index selected github repositories. To download and index all of my repositories (except for forks), storing the repos in
repos/ and writing
nelhage.idx, you might run:
bazel-bin/cmd/livegrep-github-reindex/livegrep-github-reindex -user=nelhage -forks=false -name=github.com/nelhage -out nelhage.idx
You can now use
nelhage.idx as an argument to
livegrep builds an index file of your source code, and then works entirely out of that index, with no further access to the original git repositories.
In general, the index file will be approximately the same size as the original source code. livegrep memory-maps the index file into RAM, so it should be able to work out of index files larger than (available) RAM, but will perform much better if the file can be loaded entirely into memory.
Livegrep is open source. See COPYING for more information.