Leiningen is the most active open-source Clojure project. We welcome potential contributors and do our best to try to make it easy to help out. Contributors who have had a single patch accepted may request commit rights as well as a free sticker.
Discussion occurs both in the
#leiningen channel on Freenode
and on the mailing list. To
join the mailing list, simply email leiningen@librelist.org; your
first message to that address will subscribe you without being posted.
Please report issues on the GitHub issue tracker or the mailing list. Sending bug reports to personal email addresses is inappropriate. Simpler issues appropriate for first-time contributors looking to help out are tagged "newbie".
Patches are preferred as patches from git format-patch on the
mailing list or as GitHub pull requests. Please use topic branches
when sending pull requests rather than committing directly to master
in order to minimize unnecessary merge commit clutter.
Leiningen is mirrored at Gitorious and tested on Travis.
The definitions of the various tasks reside in src/leiningen in the
top-level project. The underlying mechanisms for things like
project.clj parsing, classpath calculation, and subprocess launching
are implemented inside the leiningen-core subproject.
See the
readme for the leiningen-core library
and doc/PLUGINS.md for more details on how Leiningen's codebase is
structured.
Try to be aware of the conventions in the existing code, except the
one where we don't write tests. Make a reasonable attempt to avoid
lines longer than 80 columns or function bodies longer than 20
lines. Don't use when unless it's for side-effects. Don't introduce
new protocols. Use ^:internal metadata to mark vars which can't be
private but shouldn't be considered part of the public API.
You don't need to "build" Leiningen per se, but when you're developing on a
checkout you will need to get its dependencies in place. Just use a stable
release of Leiningen to run lein bootstrap (an alias for lein do install, classpath .lein-bootstrap) in the leiningen-core directory.
If you don't have a stable lein installed, simply check out the
stable branch and copy bin/lein to somewhere on your $PATH, then
switch your branch back.
If you want to use your development copy for everyday usage, symlink
bin/lein to somewhere on your $PATH. You'll want to rename your
stable installation to keep them from interfering; typically you can
name that lein2 or lein-stable.
When the dependencies change you may have to do rm .lein-classpath
in the project root, though in most cases this can be done automatically.
Using bin/lein alone from the master branch without a full checkout
is not supported. If you want to just grab a shell script to work
with, use the stable branch.
Before you're asking for a pull request, we would be very happy if you ensure that the changes you've done doesn't break any of the existing test cases. While there is a test suite, it's not terribly thorough, so don't put too much trust in it. Patches which add test coverage for the functionality they change are especially welcome.
To run the test cases, run bin/lein test in the root directory: This will test
both leiningen-core and leiningen itself. Do not attempt to run the tests
with a stable version of Leiningen, as the namespaces conflict and you may end
up with errors during the test run.