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Contributing to Apache Lucy
If you're looking for something to work on, see the STATUS file for a list
of development priorities that the Lucy community has already built
consensus around.
If you propose to make non-trivial changes to Lucy, especially changes to
the public API, send a note to the Lucy developer's list describing your
Lucy's codebase is housed in a Subversion repository. Run this command to
check out the mainline:
svn co lucy
If you prefer Git, we maintain read-only mirrors of our codebase on
git clone git:// lucy
There is also a mirror on Github.
Edit the source code as you see fit, then follow the instructions in INSTALL
to build Lucy and run its test suite.
Please bear the following in mind:
* All code will eventually need to be portable to multiple operating
systems and compilers. (This is a complex requirement and it should not
block your contribution.)
* All public APIs must be documented.
* Code should be formatted according to the style guidelines at
* All unit tests must pass.
* New code needs to be accompanied by new unit tests.
* Simplicity, both in terms of API and implementation, is highly valued
within the Lucy development community; the simpler the contribution, the
more quickly it can be reviewed and integrated.
With Subversion, navigate to the top level of the checkout and capture the
output of 'svn diff':
cd lucy/
svn diff > my_changes.patch
With command-line Git, you can either capture the output of 'git diff', or
use 'git format-patch' to export a series of one or more commits.
git diff > my_changes.patch
Lucy's issue-tracker/bug-tracker installation runs Atlassian JIRA and we
generally use the term "issue" rather than "bug" because not every
contribution fixes a "bug".
1. Create a JIRA account for yourself and sign in.
2. Once you have signed in, the "create new issue" link will appear. Either
use it to open a new issue or navigate to an existing one as appropriate.
3. Attach your patch to the issue using the menu command
'More Actions > Attach Files'.
Attaching a file to an issue causes an email notification to be sent to the
lucy-issues list signalling that a patch has arrived. Please be patient but
persistent while engaging with the Lucy committers who review and apply such
At this time, we have no way to accept pull requests for the Github
read-only mirror, so please use the JIRA patch submission process.
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