This page documents at a very high level how to contribute to ParaView. Please check our developer instructions for a more detailed guide to developing and contributing to the project, and our ParaView Git README for additional information.

The ParaView development cycle is built upon the following components:

Issues identify any issues including bugs and feature requests. In general, every code change should have an associated issue which identifies the bug being fixed or the feature being added.
Merge Requests are collections of changes that address issues.
Labels are labels or tags that can be added and removed to/from issues and/or merge requests to annotate them including indicating their state in the development cycle. See Labels Glossary.
Milestones refer to development milestones such as numbered public releases, or named internal releases.

Reporting Issues

If you have a bug report or a feature request for ParaView, you can use the issues tracker to report a new issue.

To report an issue.

Register GitLab Access to create an account and select a user name.
Create a new issue.
Ensure that the issue has a Title and Description with enough details for someone from the development team to reproduce the issue. See Gitlab Markdown guide for styling the Description. Include screenshots and sample datasets whenever possible. Typically, reporter should not set any other fields for the issue, including Assignee, Milestone, or Labels. These get set by members of the development team.
If developers need more information on an issue, they will add the triage:needinfo label and add a comment for the reporter soliciting more information. Once the reporter has provided the necessary information, he/she should remove the triage:needinfo label from the issue to notify the development team.

When a developer starts working on an issue, the developer will add the workflow:active-development label. Once the development is complete and the issue resolved, the issue will be closed, and the workflow:active-development label will be replaced by workflow:customer-review. At that point, the reporter can checkout the latest master and confirm that the issue has been addressed. If so, the reporter can remove the workflow:customer-review label. If the issue was not addressed then the reporter should reopen the issue or solicit more information from the developer by adding the triage:needinfo label.

To keep the number of open issues manageable, we will periodically expire old issues with no activity. Such issues will be closed and tagged with the label triage:expired. Such issues can be reopened if needed.

Notes for project managers

For every issue, project managers can assign:

project:... label to indicate which project this issue is necessary for. An issue may have multiple projects associated with it.
Milestone to indicate which release this issue fix is planned for.
priority:... label to indicate how critical is this issue for the specific milestone, ranging from priority:required, priority:important, priority:nice-to-have, and priority:low. Only one priority label makes sense at a time.

Notes for developers

For every issue, developers can assign:

area:... labels to indicate which area this issue relates to e.g. area:web, area:catalyst, etc.
triage:... labels to indicate issue triage status. triage:confirmed is added when the issue has been confirmed. triage:easy is added for issues that are easy to fix. triage:feature is added to issues that are new feature requests. triage:needinfo is added to solicit more information from the reporter.
triage:needinfo label on closed issues means the reporter or reviewer is requesting more information from the developer before the fix can be reviewed. Please provide such information and then remove the label.
workflow:active-development label should be added to issues under development.

Fixing issues

Typically, one addresses issues by writing code. To start contributing to ParaView:

Register GitLab Access to create an account and select a user name.
Fork ParaView into your user's namespace on GitLab.
Create a local clone of the main ParaView repository. Optionally configure Git to use SSH instead of HTTPS. Then clone:
```
$ git clone --recursive https://gitlab.kitware.com/paraview/paraview.git ParaView
$ cd ParaView
```
The main repository will be configured as your origin remote.

For more information see: Setup and download instructions
Run the developer setup script to prepare your ParaView work tree and create Git command aliases used below:
```
$ ./Utilities/SetupForDevelopment.sh
```
This will prompt for your GitLab user name and configure a remote called gitlab to refer to it. Choose the defaults for ParaView Data questions.

For more information see: Setup
Build Paraview and run it.
Edit files and create commits (repeat as needed):
```
$ edit file1 file2 file3
$ git add file1 file2 file3
$ git commit
```
Commit messages must be thorough and informative so that reviewers will have a good understanding of why the change is needed before looking at the code. Appropriately refer to the issue number, if applicable.

For more information see: Create a Topic
Push commits in your topic branch to your fork in GitLab:
```
$ git gitlab-push
```
For more information see: Share a Topic
Run tests with ctest, or use the dashboard
Visit your fork in GitLab, browse to the "**Merge Requests**" link on the left, and use the "**New Merge Request**" button in the upper right to create a Merge Request.

For more information see: Create a Merge Request

Follow the review process to get your merge request reviewed and tested. On success, the merge-request can be merged and closed.

For more information see: Review a Merge Request
When a merge request is closed, any related issue should be closed (if not closed automatically) and assigned the workflow:customer-review label to request a review from the reporter.
Monitor the related issue for any triage:needinfo label additions to provide the customer with any details necessary to test the fix.

We have a ParaView Discourse forum to coordinate development and to provide support.