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534 lines
23 KiB
Markdown
534 lines
23 KiB
Markdown
Contributing to Paper
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==========================
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PaperMC is happy you're willing to contribute to our projects. We are usually
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very lenient with all submitted PRs, but there are still some guidelines you
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can follow to make the approval process go more smoothly.
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**Table of contents:**
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<!-- Please don't remove the following comments.
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To generate and update the TOC: https://github.com/mzlogin/vim-markdown-toc -->
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<!-- vim-markdown-toc GFM -->
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* [Use a Personal Fork and not Organization](#use-a-personal-fork-and-not-organization)
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* [Requirements](#requirements)
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* [Understanding Patches](#understanding-patches)
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* [Adding Patches](#adding-patches)
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* [Modifying Patches](#modifying-patches)
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* [Method 1](#method-1)
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* [Using the Paper tool](#using-the-paper-tool)
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* [Manual method: Stashing](#manual-method-stashing)
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* [Method 2 - Fixup commits](#method-2---fixup-commits)
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* [Manual method](#manual-method)
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* [Automatic method](#automatic-method)
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* [PR Policy](#pr-policy)
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* [Rebasing PRs](#rebasing-prs)
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* [Formatting](#formatting)
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* [Patch Notes](#patch-notes)
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* [Obfuscation Helpers](#obfuscation-helpers)
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* [Configuration files](#configuration-files)
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* [PaperConfig example](#paperconfig-example)
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* [PaperWorldConfig example](#paperworldconfig-example)
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* [Frequently Asked Questions](#frequently-asked-questions)
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* [I can't find the NMS file I need!](#i-cant-find-the-nms-file-i-need)
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* [Where can I learn how to name method/field?](#where-can-i-learn-how-to-name-methodfield)
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* [My commit doesn't need a build, what do I do?](#my-commit-doesnt-need-a-build-what-do-i-do)
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* [Patching and building is *really* slow, what can I do?](#patching-and-building-is-really-slow-what-can-i-do)
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* [I wrote some API, how do I use it in Paper-Server?](#i-wrote-some-api-how-do-i-use-it-in-paper-server)
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<!-- vim-markdown-toc -->
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## Use a Personal Fork and not Organization
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Paper will routinely modify your PR, whether it's a quick rebase or to take care
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of any minor nitpicks we might have. Often, it's better for us to solve these
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problems for you than make you go back and forth trying to fix it yourself.
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Unfortunately, if you use an organization for your PR, it prevents Paper from
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modifying it. This requires us to manually merge your PR, resulting in us
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closing the PR instead of marking it as merged.
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We much prefer to have PRs show as merged, so please do not use repositories
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on organizations for PRs.
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See <https://github.com/isaacs/github/issues/1681> for more information on the
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issue.
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## Requirements
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To get started with PRing changes, you'll need the following software, most of
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which can be obtained in (most) package managers such as `apt` (Debian / Ubuntu;
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you will most likely use this for WSL), `homebrew` (macOS / Linux), and more:
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- `git` (package `git` everywhere);
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- `patch` (often package `patch`);
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- A Java 8 or later JDK (packages vary, use Google/DuckDuckGo/etc.).
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If you need one, you can find them on [AdoptOpenJDK](https://adoptopenjdk.net/).
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- `maven` (often package `maven`; can be found on
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[Apache's site](https://maven.apache.org/download.cgi) too);
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- `curl` (package `curl` everywhere).
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If you're on Windows, check
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[the section on WSL](#patching-and-building-is-really-slow-what-can-i-do).
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If you're compiling with Docker, you can use the
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[`adoptopenjdk`](https://hub.docker.com/_/adoptopenjdk/) images like so:
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```console
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# docker run -it -v "$(pwd)":/data --rm adoptopenjdk:8-jdk-hotspot bash
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Pulling image...
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root@abcdefg1234:/# javac -version
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javac 1.8.0_252
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```
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## Understanding Patches
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Paper is mostly patches and extensions to Spigot. These patches/extensions are
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split into different directories which target certain parts of the code. These
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directories are:
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- `Paper-API` - Modifications to `Spigot-API`/`Bukkit`;
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- `Paper-MojangAPI` - An API for
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[Mojang's Brigadier](https://github.com/Mojang/brigadier);
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- `Paper-Server` - Modifications to `Spigot`/`CraftBukkit`.
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Because the entire structure is based on patches and git, a basic understanding
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of how to use git is required. A basic tutorial can be found here:
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<https://git-scm.com/docs/gittutorial>.
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Assuming you have already forked the repository:
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1. Clone your fork to your local machine;
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1. Type `./paper patch` in a terminal to apply the changes from upstream;
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1. cd into `Paper-Server` for server changes, and `Paper-API` for API changes.
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You can also run `./paper server` or `./paper api` for these same directories
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respectively.
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1. You can also run `./paper setup`, which allows you to type `paper <command>`
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from anywhere in the Paper structure in most cases.
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`Paper-Server` and `Paper-API` aren't git repositories in the traditional sense:
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- Every single commit in `Paper-Server`/`Paper-API` is a patch;
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- `origin/master` points to a directory similar to `Paper-Server`/`Paper-API`
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but for Paper;
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- Typing `git status` should show that we are 10 or 11 commits ahead of master,
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meaning we have 10 or 11 patches Spigot and CraftBukkit don't.
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- If it says something like `212 commits ahead, 207 commits behind`,
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cd into the root directory of the cloned repository and type `git fetch` to
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update your upstream. Setting up a remote for the upstream Paper repository
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might be necessary.
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## Adding Patches
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Adding patches to Paper is very simple:
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1. Modify `Paper-Server` and/or `Paper-API` with the appropriate changes;
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1. Type `git add .` inside these directories to add your changes;
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1. Run `git commit` with the desired patch message;
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1. Run `./paper rebuild` in the main directory to convert your commit into a new
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patch;
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1. PR the generated patch file(s) back to this repository.
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Your commit will be converted into a patch that you can then PR into Paper.
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> ❗ Please note that if you have some specific implementation detail you'd like
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> to document, you should do so in the patch message *or* in comments.
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## Modifying Patches
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Modifying previous patches is a bit more complex:
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### Method 1
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This method works by temporarily resetting your `HEAD` to the desired commit to
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edit it using `git rebase`.
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> ❗ While in the middle of an edit, you will not be able to compile unless you
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> *also* reset the opposing module(s) to a related commit. In the API's case,
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> you must reset the Server, and reset the API if you're editing the Server.
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#### Using the Paper tool
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The PaperMC build tool provides a handy command to automatically do this type of
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patch modification.
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1. Type `./paper edit server` or `./paper edit api` depending on which project
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you want to edit;
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- It should show something like
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[this](https://gist.github.com/zachbr/21e92993cb99f62ffd7905d7b02f3159) in
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the text editor you get.
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- If your editor does not have a "menu" at the bottom, you're using `vim`.
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If you don't know how to use `vim` and don't want to
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learn, enter `:q!` and press enter. Before redoing this step, do
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`export EDITOR=nano` for an easier editor to use.
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1. Replace `pick` with `edit` for the commit/patch you want to modify, and
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"save" the changes;
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- Only do this for **one** commit at a time.
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1. Make the changes you want to make to the patch;
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1. Type `./paper edit continue` in the root directory to finish and rebuild
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patches;
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1. PR your modified patch file(s) back to this repository.
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#### Manual method: Stashing
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In case you need something more complex or want more control, these step-by-step
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instruction do exactly what the above slightly automated system above does.
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1. If you have changes you are working on, type `git stash` to store them for
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later;
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- You can type `git stash pop` to get them back at any point.
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1. Type `git rebase -i upstream/upstream`;
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- It should show something like
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[this](https://gist.github.com/zachbr/21e92993cb99f62ffd7905d7b02f3159) in
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the text editor you get.
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- If your editor does not have a "menu" at the bottom, you're using `vim`.
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If you don't know how to use `vim` and don't want to
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learn, enter `:q!` and press enter. Before redoing this step, do
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`export EDITOR=nano` for an easier editor to use.
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1. Replace `pick` with `edit` for the commit/patch you want to modify, and
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"save" the changes;
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- Only do this for **one** commit at a time.
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1. Make the changes you want to make to the patch;
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1. Type `git add .` to add your changes;
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1. Type `git commit --amend` to commit;
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- **Make sure to add `--amend`** or else a new patch will be created.
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- You can also modify the commit message and author here.
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1. Type `git rebase --continue` to finish rebasing;
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1. Type `./paper rebuild` in the root directory;
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- This will modify the appropriate patches based on your commits.
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1. PR your modified patch file(s) back to this repository.
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### Method 2 - Fixup commits
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If you are simply editing a more recent commit or your change is small, simply
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making the change at HEAD and then moving the commit after you have tested it
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may be easier.
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This method has the benefit of being able to compile to test your change without
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messing with your HEADs.
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#### Manual method
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1. Make your change while at HEAD;
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1. Make a temporary commit. You don't need to make a message for this;
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1. Type `git rebase -i upstream/upstream`, move (cut) your temporary commit and
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move it under the line of the patch you wish to modify;
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1. Change the `pick` to the appropriate action:
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1. `f`/`fixup`: Merge your changes into the patch without touching the
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message.
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1. `s`/`squash`: Merge your changes into the patch and use your commit message
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and subject.
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1. Type `./paper rebuild` in the root directory;
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- This will modify the appropriate patches based on your commits.
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1. PR your modified patch file(s) back to this repository.
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#### Automatic method
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1. Make your change while at HEAD;
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1. Make a fixup commit. `git commit -a --fixup <hashOfPatchToFix>`;
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- You can also use `--squash` instead of `--fixup` if you want the commit
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message to also be changed.
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- You can get the hash by looking at `git log` or `git blame`; your IDE can
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assist you too.
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- Alternatively, if you only know the name of the patch, you can do
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`git commit -a --fixup "Subject of Patch name"`.
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1. Rebase with autosquash: `git rebase --autosquash -i upstream/upstream`.
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This will automatically move your fixup commit to the right place, and you just
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need to "save" the changes.
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1. Type `./paper rebuild` in the root directory;
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- This will modify the appropriate patches based on your commits.
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1. PR your modified patch file(s) back to this repository.
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## Rebasing PRs
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Steps to rebase a PR to include the latest changes from `master`.
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These steps assume the `origin` remote is your fork of this repository and `upstream` is the official PaperMC repository.
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1. Pull latest changes from upstream's master: `git checkout master && git pull upstream master`.
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1. Checkout feature/fix branch and rebase on master: `git checkout patch-branch && git rebase master`.
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1. Apply updated patches: `./paper patch`.
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1. If there are conflicts, fix them.
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1. If your PR creates new patches instead of modifying exist ones, in both the `Paper-Server` and `Paper-API` directories, ensure your newly-created patch is the last commit by either:
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* Renaming the patch file with a large 4 digit number in front (e.g. 9999-Patch-to-add-some-new-stuff.patch)
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* Run `git rebase --interactive upstream/upstream` and move the commits to the end.
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1. Rebuild patches: `./paper rebuild`.
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1. Force push changes: `git push --force`.
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## PR Policy
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We'll accept changes that make sense. You should be able to justify their
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existence, along with any maintenance costs that come with them. Using
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[obfuscation helpers](#obfuscation-helpers) aids in the maintenance costs.
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Remember that these changes will affect everyone who runs Paper, not just you
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and your server.
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While we will fix minor formatting issues, you should stick to the guide below
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when making and submitting changes.
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## Formatting
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All modifications to non-Paper files should be marked.
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- Multi-line changes start with `// Paper start` and end with `// Paper end`;
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- You can put a comment with an explanation if it isn't obvious, like this:
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`// Paper start - reason`.
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- The comments should generally be about the reason the change was made, what
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it was before, or what the change is.
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- Multi-line messages should start with `// Paper start` and use `/* Multi
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line message here */` for the message itself.
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- One-line changes should have `// Paper` or `// Paper - reason`.
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Here's an example of how to mark changes by Paper:
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```java
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entity.getWorld().dontbeStupid(); // Paper - was beStupid() which is bad
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entity.getFriends().forEach(Entity::explode);
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entity.a();
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entity.b();
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// Paper start - use plugin-set spawn
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// entity.getWorld().explode(entity.getWorld().getSpawn());
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Location spawnLocation = ((CraftWorld)entity.getWorld()).getSpawnLocation();
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entity.getWorld().explode(new BlockPosition(spawnLocation.getX(), spawnLocation.getY(), spawnLocation.getZ()));
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// Paper end
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```
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We generally follow usual Java style (aka. Oracle style), or what is programmed
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into most IDEs and formatters by default. There are a few notes, however:
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- It is fine to go over 80 lines as long as it doesn't hurt readability.
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There are exceptions, especially in Spigot-related files
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- When in doubt or the code around your change is in a clearly different style,
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use the same style as the surrounding code.
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## Patch Notes
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When submitting patches to Paper, we may ask you to add notes to the patch
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header. While we do not require it for all changes, you should add patch notes
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when the changes you're making are technical, complex, or require an explanation
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of some kind. It is very likely that your patch will remain long after we've all
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forgotten about the details of your PR; patch notes will help us maintain it
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without having to dig back through GitHub history looking for your PR.
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These notes should express the intent of your patch, as well as any pertinent
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technical details we should keep in mind long-term. Ultimately, they exist to
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make it easier for us to maintain the patch across major version changes.
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If you add a message to your commit in the `Paper-Server`/`Paper-API`
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directories, the rebuild patches script will handle these patch notes
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automatically as part of generating the patch file. If you are not
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extremely careful, you should always just `squash` or `amend` a patch (see the
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above sections on modifying patches) and rebuild.
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Editing messages and patches by hand is possible, but you should patch and
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rebuild afterwards to make sure you did it correctly. This is slower than just
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modifying the patches properly after a few times, so you will not really gain
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anything but headaches from doing it by hand.
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Underneath is an example patch header/note:
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```patch
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From 02abc033533f70ef3165a97bfda3f5c2fa58633a Mon Sep 17 00:00:00 2001
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From: Shane Freeder <theboyetronic@gmail.com>
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Date: Sun, 15 Oct 2017 00:29:07 +0100
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Subject: [PATCH] revert serverside behavior of keepalives
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This patch intends to bump up the time that a client has to reply to the
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server back to 30 seconds as per pre 1.12.2, which allowed clients
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more than enough time to reply potentially allowing them to be less
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tempermental due to lag spikes on the network thread, e.g. that caused
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by plugins that are interacting with netty.
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We also add a system property to allow people to tweak how long the server
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will wait for a reply. There is a compromise here between lower and higher
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values, lower values will mean that dead connections can be closed sooner,
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whereas higher values will make this less sensitive to issues such as spikes
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from networking or during connections flood of chunk packets on slower clients,
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at the cost of dead connections being kept open for longer.
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diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
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index a92bf8967..d0ab87d0f 100644
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--- a/src/main/java/net/minecraft/server/PlayerConnection.java
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+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
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```
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## Obfuscation Helpers
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In an effort to make future updates easier on ourselves, Paper tries to use
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obfuscation helpers whenever possible. The purpose of these helpers is to make
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the code more readable and maintainable. These helpers should be be made as easy
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to inline as possible by the JVM whenever possible.
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An obfuscation helper to access an obfuscated item may be as simple as something
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like this:
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```java
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public final int getStuckArrows() { return this.bY(); } // Paper - OBFHELPER
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```
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Or it may be as complex as forwarding an entire method so that it can be
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overridden later:
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```java
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public boolean be() {
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// Paper start - OBFHELPER
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return this.pushedByWater();
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}
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public boolean pushedByWater() {
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// Paper end
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return true;
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}
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```
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While they may not always be done in exactly the same way, the general goal is
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always to improve readability and maintainability. Use your best judgment and do
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what fits best in your situation.
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## Configuration files
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To use a configurable value in your patch, add a new entry in either the
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`PaperConfig` or `PaperWorldConfig` classes. Use `PaperConfig` if a value
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must remain the same throughout all worlds, or the latter if it can change
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between worlds. World-specific configuration options are preferred whenever
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possible.
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### PaperConfig example
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```java
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public static boolean saveEmptyScoreboardTeams = false;
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private static void saveEmptyScoreboardTeams() {
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// This is called automatically!
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// The name also doesn't matter.
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saveEmptyScoreboardTeams = getBoolean("settings.save-empty-scoreboard-teams", false);
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}
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```
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Notice that the field is always public, but the setter is always private. This
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is important to the way the configuration generation system works. To access
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this value, reference it as you would any other static value:
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```java
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if (!PaperConfig.saveEmptyScoreboardTeams) {
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```
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It is often preferred that you use the fully qualified name for the
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configuration class when accessing it, like so:
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`com.destroystokyo.paper.PaperConfig.valueHere`.
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If this is not done, a developer for Paper might fix that for you before
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merging, but it's always nice if you make it a habit where you only need 1-2
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lines changed.
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### PaperWorldConfig example
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```java
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public boolean useInhabitedTime = true;
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private void useInhabitedTime() {
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// This is called automatically!
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// The name also doesn't matter.
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useInhabitedTime = getBoolean("use-chunk-inhabited-timer", true);
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}
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```
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Again, notice that the field is always public, but the setter is always private.
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To access this value, you'll need an instance of the `net.minecraft.World`
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object:
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```java
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return this.world.paperConfig.useInhabitedTime ? this.w : 0;
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```
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## Frequently Asked Questions
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### I can't find the NMS file I need!
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By default, Paper (and upstream) only import files we make changes to. If you
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would like to make changes to a file that isn't present in `Paper-Server`'s
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source directory, you just need to add it to our import script ran during the
|
|
patching process.
|
|
|
|
1. Save (rebuild) any patches you are in the middle of working on! Their
|
|
progress will be lost if you do not;
|
|
1. Identify the name(s) of the file(s) you want to import.
|
|
- A complete list of all possible file names can be found at
|
|
`./work/Minecraft/$MCVER/spigot/net/minecraft/server`. You might find
|
|
[MiniMappingViewer] very useful to find the file you need.
|
|
1. Open the file at `./scripts/importmcdev.sh` and add the name of your file to
|
|
the script. Skip to the 2nd last header and follow the instructions there;
|
|
1. Re-patch the server `./paper patch`;
|
|
1. Edit away!
|
|
|
|
> ❗ This change is temporary! **DO NOT COMMIT CHANGES TO THIS FILE!**
|
|
> Once you have made your changes to the new file, and rebuilt patches, you may
|
|
> undo your changes to `importmcdev.sh`.
|
|
|
|
Any file modified in a patch file gets automatically imported, so you only need
|
|
this temporarily to import it to create the first patch.
|
|
|
|
To undo your changes to the file, type `git checkout scripts/importmcdev.sh`.
|
|
|
|
### Where can I learn how to name method/field?
|
|
|
|
For most cases, it is preferred if you use [yarn], as their license works with
|
|
Paper's license. If you can't do that, [MiniMappingViewer] is always around to
|
|
provide you with more of a general idea, *but* you cannot use the Mojang names
|
|
for more than understanding the code.
|
|
|
|
[yarn] is in general more thorough than Mojang's own mappings, as they include
|
|
method arguments as well, whereas Mojang's do not. If you need local variables
|
|
to understand the code, you might be more lucky with ModCoderPack.
|
|
|
|
For more information on the Mojang name licensing issues, check this out:
|
|
<https://cpw.github.io/MinecraftMappingData.html>
|
|
|
|
### My commit doesn't need a build, what do I do?
|
|
|
|
Well, quite simple: You add `[CI-SKIP]` to the start of your commit subject.
|
|
|
|
This case most often applies to changes to files like `README.md`, this very
|
|
file (`CONTRIBUTING.md`), the `LICENSE.md` file, and so forth.
|
|
|
|
### Patching and building is *really* slow, what can I do?
|
|
|
|
This only applies if you're running Windows. If you're running a prior Windows
|
|
release, either update to Windows 10 or move to macOS/Linux/BSD.
|
|
|
|
In order to speed up patching process on Windows, it's recommended you get WSL
|
|
2. This is available in Windows 10 v2004, build 19041 or higher. (You can check
|
|
your version by running `winver` in the run window (Windows key + R)). If you're
|
|
out of date, update your system with the
|
|
[Windows Update Assistant](https://www.microsoft.com/en-us/software-download/windows10).
|
|
|
|
To setup WSL 2, follow the information here:
|
|
<https://docs.microsoft.com/en-us/windows/wsl/install-win10>
|
|
|
|
You will most likely want to use the Ubuntu apps. Once it's set up, install the
|
|
required tools with `sudo apt-get update && sudo apt-get install $TOOL_NAMES
|
|
-y`. Replace `$TOOL_NAMES` with the packages found in the
|
|
[requirements](#requirements). You can now clone the repository and do
|
|
everything like usual.
|
|
|
|
> ❗ Do not use the `/mnt/` directory in WSL! Instead, mount the WSL directories
|
|
> in Windows like described here:
|
|
> <https://www.howtogeek.com/426749/how-to-access-your-linux-wsl-files-in-windows-10/>
|
|
|
|
### I wrote some API, how do I use it in Paper-Server?
|
|
|
|
To install the API to your local maven repository, do the following:
|
|
|
|
- Enter the API directory by running `./paper api`;
|
|
- Run `mvn install`.
|
|
- If you are working on a patch without much care for whether the tests
|
|
pass, you can instead run `mvn install -DskipTests`. Do not PR changes
|
|
without running tests first.
|
|
- If a test failed, you have to identify the failing tests by scrolling up a
|
|
couple lines (i.e. around 50-200). You should find it fairly quickly.
|
|
- If you later need to use the Paper-API, you might want to remove the jar
|
|
from your local maven repository.
|
|
If you use Windows and don't usually build using WSL, you might not need to
|
|
do this.
|
|
|
|
You can now use the API in your plugin to test it before PRing. You will also
|
|
need to do this to build the Server with the implemented API.
|
|
|
|
[MiniMappingViewer]: https://minidigger.github.io/MiniMappingViewer/
|
|
[yarn]: https://github.com/FabricMC/yarn
|