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CONTRIBUTING.md
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@ -8,9 +8,9 @@ something. We appreciate any sort of contributions, and don't want a wall of rul
Clippy welcomes contributions from everyone. There are many ways to contribute to Clippy and the following document Clippy welcomes contributions from everyone. There are many ways to contribute to Clippy and the following document
explains how you can contribute and how to get started. If you have any questions about contributing or need help with explains how you can contribute and how to get started. If you have any questions about contributing or need help with
anything, feel free to ask questions on issues or visit the `#clippy` on [Discord](https://discord.gg/rust-lang). anything, feel free to ask questions on issues or visit the `#clippy` on [Discord].
All contributors are expected to follow the [Rust Code of Conduct](http://www.rust-lang.org/conduct.html). All contributors are expected to follow the [Rust Code of Conduct].
* [Getting started](#getting-started) * [Getting started](#getting-started)
* [Finding something to fix/improve](#finding-something-to-fiximprove) * [Finding something to fix/improve](#finding-something-to-fiximprove)
@ -21,6 +21,9 @@ All contributors are expected to follow the [Rust Code of Conduct](http://www.ru
* [Bors and Homu](#bors-and-homu) * [Bors and Homu](#bors-and-homu)
* [Contributions](#contributions) * [Contributions](#contributions)
[Discord]: https://discord.gg/rust-lang
[Rust Code of Conduct]: https://www.rust-lang.org/policies/code-of-conduct
## Getting started ## Getting started
High level approach: High level approach:
@ -35,51 +38,57 @@ High level approach:
All issues on Clippy are mentored, if you want help with a bug just ask @Manishearth, @llogiq, @mcarton or @oli-obk. All issues on Clippy are mentored, if you want help with a bug just ask @Manishearth, @llogiq, @mcarton or @oli-obk.
Some issues are easier than others. The [`good first issue`](https://github.com/rust-lang/rust-clippy/labels/good%20first%20issue) Some issues are easier than others. The [`good first issue`] label can be used to find the easy issues.
label can be used to find the easy issues. If you want to work on an issue, please leave a comment If you want to work on an issue, please leave a comment so that we can assign it to you!
so that we can assign it to you!
There are also some abandoned PRs, marked with There are also some abandoned PRs, marked with [`S-inactive-closed`].
[`S-inactive-closed`](https://github.com/rust-lang/rust-clippy/pulls?q=is%3Aclosed+label%3AS-inactive-closed).
Pretty often these PRs are nearly completed and just need some extra steps Pretty often these PRs are nearly completed and just need some extra steps
(formatting, addressing review comments, ...) to be merged. If you want to (formatting, addressing review comments, ...) to be merged. If you want to
complete such a PR, please leave a comment in the PR and open a new one based complete such a PR, please leave a comment in the PR and open a new one based
on it. on it.
Issues marked [`T-AST`](https://github.com/rust-lang/rust-clippy/labels/T-AST) involve simple Issues marked [`T-AST`] involve simple matching of the syntax tree structure,
matching of the syntax tree structure, and are generally easier than and are generally easier than [`T-middle`] issues, which involve types
[`T-middle`](https://github.com/rust-lang/rust-clippy/labels/T-middle) issues, which involve types
and resolved paths. and resolved paths.
[`T-AST`](https://github.com/rust-lang/rust-clippy/labels/T-AST) issues will generally need you to match against a [`T-AST`] issues will generally need you to match against a predefined syntax structure.
predefined syntax structure. To figure out how this syntax structure is encoded in the AST, it is recommended to run To figure out how this syntax structure is encoded in the AST, it is recommended to run
`rustc -Z ast-json` on an example of the structure and compare with the [nodes in the AST `rustc -Z ast-json` on an example of the structure and compare with the [nodes in the AST docs].
docs]. Usually the lint will end up to be a nested series of matches and ifs, [like Usually the lint will end up to be a nested series of matches and ifs, [like so].
so](https://github.com/rust-lang/rust-clippy/blob/de5ccdfab68a5e37689f3c950ed1532ba9d652a0/src/misc.rs#L34).
[`E-medium`](https://github.com/rust-lang/rust-clippy/labels/E-medium) issues are generally [`E-medium`] issues are generally pretty easy too, though it's recommended you work on an E-easy issue first.
pretty easy too, though it's recommended you work on an E-easy issue first. They are mostly classified They are mostly classified as [`E-medium`], since they might be somewhat involved code wise,
as `E-medium`, since they might be somewhat involved code wise, but not difficult per-se. but not difficult per-se.
[`T-middle`](https://github.com/rust-lang/rust-clippy/labels/T-middle) issues can [`T-middle`] issues can be more involved and require verifying types. The [`ty`] module contains a
be more involved and require verifying types. The
[`ty`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc/ty) module contains a
lot of methods that are useful, though one of the most useful would be `expr_ty` (gives the type of lot of methods that are useful, though one of the most useful would be `expr_ty` (gives the type of
an AST expression). `match_def_path()` in Clippy's `utils` module can also be useful. an AST expression). `match_def_path()` in Clippy's `utils` module can also be useful.
[`good first issue`]: https://github.com/rust-lang/rust-clippy/labels/good%20first%20issue
[`S-inactive-closed`]: https://github.com/rust-lang/rust-clippy/pulls?q=is%3Aclosed+label%3AS-inactive-closed
[`T-AST`]: https://github.com/rust-lang/rust-clippy/labels/T-AST
[`T-middle`]: https://github.com/rust-lang/rust-clippy/labels/T-middle
[`E-medium`]: https://github.com/rust-lang/rust-clippy/labels/E-medium
[`ty`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc/ty
[nodes in the AST docs]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/ast/ [nodes in the AST docs]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/ast/
[like so]: https://github.com/rust-lang/rust-clippy/blob/de5ccdfab68a5e37689f3c950ed1532ba9d652a0/src/misc.rs#L34
## Writing code ## Writing code
Have a look at the [docs for writing lints](doc/adding_lints.md) for more details. [Llogiq's blog post on Have a look at the [docs for writing lints][adding_lints] for more details. [Llogiq's blog post on lints]
lints](https://llogiq.github.io/2015/06/04/workflows.html) is also a nice primer to lint-writing, though it does get is also a nice primer to lint-writing, though it does get into advanced stuff and may be a bit outdated.
into advanced stuff and may be a bit outdated.
If you want to add a new lint or change existing ones apart from bugfixing, it's If you want to add a new lint or change existing ones apart from bugfixing, it's
also a good idea to give the [stability guarantees][rfc_stability] and also a good idea to give the [stability guarantees][rfc_stability] and
[lint categories][rfc_lint_cats] sections of the [Clippy 1.0 RFC][clippy_rfc] a [lint categories][rfc_lint_cats] sections of the [Clippy 1.0 RFC][clippy_rfc] a
quick read. quick read.
[adding_lints]: https://github.com/rust-lang/rust-clippy/blob/master/doc/adding_lints.md
[Llogiq's blog post on lints]: https://llogiq.github.io/2015/06/04/workflows.html
[clippy_rfc]: https://github.com/rust-lang/rfcs/blob/master/text/2476-clippy-uno.md
[rfc_stability]: https://github.com/rust-lang/rfcs/blob/master/text/2476-clippy-uno.md#stability-guarantees
[rfc_lint_cats]: https://github.com/rust-lang/rfcs/blob/master/text/2476-clippy-uno.md#lint-audit-and-categories
## How Clippy works ## How Clippy works
[`clippy_lints/src/lib.rs`][lint_crate_entry] imports all the different lint modules and registers in the [`LintStore`]. [`clippy_lints/src/lib.rs`][lint_crate_entry] imports all the different lint modules and registers in the [`LintStore`].
@ -131,13 +140,16 @@ The difference between `EarlyLintPass` and `LateLintPass` is that the methods of
AST information. The methods of the `LateLintPass` trait are executed after type checking and contain type information AST information. The methods of the `LateLintPass` trait are executed after type checking and contain type information
via the `LateContext` parameter. via the `LateContext` parameter.
That's why the `else_if_without_else` example uses the `register_early_pass` function. Because the [actual lint That's why the `else_if_without_else` example uses the `register_early_pass` function. Because the
logic][else_if_without_else] does not depend on any type information. [actual lint logic][else_if_without_else] does not depend on any type information.
See also [the adding lints doc]. [lint_crate_entry]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/src/lib.rs
[else_if_without_else]: https://github.com/rust-lang/rust-clippy/blob/4253aa7137cb7378acc96133c787e49a345c2b3c/clippy_lints/src/else_if_without_else.rs
[the adding lints doc]: https://github.com/rust-lang/rust-clippy/blob/master/doc/adding_lints.md
[`LintStore`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LintStore.html [`LintStore`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LintStore.html
[reg_early_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LintStore.html#method.register_early_pass
[reg_late_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LintStore.html#method.register_late_pass
[early_lint_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.EarlyLintPass.html
[late_lint_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.LateLintPass.html
## Fixing build failures caused by Rust ## Fixing build failures caused by Rust
@ -146,8 +158,8 @@ the times we have to adapt to the changes and only very rarely there's an actual
caused by Rust updates, can be a good way to learn about Rust internals. caused by Rust updates, can be a good way to learn about Rust internals.
In order to find out why Clippy does not work properly with a new Rust commit, you can use the [rust-toolstate commit In order to find out why Clippy does not work properly with a new Rust commit, you can use the [rust-toolstate commit
history][toolstate_commit_history]. You will then have to look for the last commit that contains history][toolstate_commit_history]. You will then have to look for the last commit that contains
`test-pass -> build-fail` or `test-pass` -> `test-fail` for the `clippy-driver` component. `test-pass -> build-fail` or `test-pass -> test-fail` for the `clippy-driver` component.
[Here][toolstate_commit] is an example. [Here][toolstate_commit] is an example.
The commit message contains a link to the PR. The PRs are usually small enough to discover the breaking API change and The commit message contains a link to the PR. The PRs are usually small enough to discover the breaking API change and
@ -178,6 +190,12 @@ git commit -m "Update Clippy"
# Open a PR in rust-lang/rust # Open a PR in rust-lang/rust
``` ```
[rustup_component_history]: https://rust-lang.github.io/rustup-components-history
[toolstate_commit_history]: https://github.com/rust-lang-nursery/rust-toolstate/commits/master
[toolstate_commit]: https://github.com/rust-lang-nursery/rust-toolstate/commit/aad74d8294e198a7cf8ac81a91aebb7f3bbcf727
[rtim]: https://github.com/kennytm/rustup-toolchain-install-master
[`rust-lang/rust`]: https://github.com/rust-lang/rust
## Issue and PR triage ## Issue and PR triage
Clippy is following the [Rust triage procedure][triage] for issues and pull Clippy is following the [Rust triage procedure][triage] for issues and pull
@ -202,34 +220,22 @@ You can find the Clippy bors queue [here][homu_queue].
If you have @bors permissions, you can find an overview of the available If you have @bors permissions, you can find an overview of the available
commands [here][homu_instructions]. commands [here][homu_instructions].
## Contributions
Contributions to Clippy should be made in the form of GitHub pull requests. Each pull request will
be reviewed by a core contributor (someone with permission to land patches) and either landed in the
main tree or given feedback for changes that would be required.
All code in this repository is under the [Apache-2.0](https://www.apache.org/licenses/LICENSE-2.0)
or the [MIT](https://opensource.org/licenses/MIT) license.
<!-- adapted from https://github.com/servo/servo/blob/master/CONTRIBUTING.md -->
[lint_crate_entry]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/src/lib.rs
[else_if_without_else]: https://github.com/rust-lang/rust-clippy/blob/4253aa7137cb7378acc96133c787e49a345c2b3c/clippy_lints/src/else_if_without_else.rs
[reg_early_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LintStore.html#method.register_early_pass
[reg_late_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LintStore.html#method.register_late_pass
[early_lint_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.EarlyLintPass.html
[late_lint_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.LateLintPass.html
[toolstate_commit_history]: https://github.com/rust-lang-nursery/rust-toolstate/commits/master
[toolstate_commit]: https://github.com/rust-lang-nursery/rust-toolstate/commit/aad74d8294e198a7cf8ac81a91aebb7f3bbcf727
[rtim]: https://github.com/kennytm/rustup-toolchain-install-master
[rustup_component_history]: https://rust-lang.github.io/rustup-components-history
[clippy_rfc]: https://github.com/rust-lang/rfcs/blob/master/text/2476-clippy-uno.md
[rfc_stability]: https://github.com/rust-lang/rfcs/blob/master/text/2476-clippy-uno.md#stability-guarantees
[rfc_lint_cats]: https://github.com/rust-lang/rfcs/blob/master/text/2476-clippy-uno.md#lint-audit-and-categories
[triage]: https://forge.rust-lang.org/triage-procedure.html [triage]: https://forge.rust-lang.org/triage-procedure.html
[l-crash]: https://github.com/rust-lang/rust-clippy/labels/L-crash%20%3Aboom%3A [l-crash]: https://github.com/rust-lang/rust-clippy/labels/L-crash%20%3Aboom%3A
[l-bug]: https://github.com/rust-lang/rust-clippy/labels/L-bug%20%3Abeetle%3A [l-bug]: https://github.com/rust-lang/rust-clippy/labels/L-bug%20%3Abeetle%3A
[homu]: https://github.com/rust-lang/homu [homu]: https://github.com/rust-lang/homu
[homu_instructions]: https://buildbot2.rust-lang.org/homu/ [homu_instructions]: https://buildbot2.rust-lang.org/homu/
[homu_queue]: https://buildbot2.rust-lang.org/homu/queue/clippy [homu_queue]: https://buildbot2.rust-lang.org/homu/queue/clippy
[`rust-lang/rust`]: https://github.com/rust-lang/rust
## Contributions
Contributions to Clippy should be made in the form of GitHub pull requests. Each pull request will
be reviewed by a core contributor (someone with permission to land patches) and either landed in the
main tree or given feedback for changes that would be required.
All code in this repository is under the [Apache-2.0] or the [MIT] license.
<!-- adapted from https://github.com/servo/servo/blob/master/CONTRIBUTING.md -->
[Apache-2.0]: https://www.apache.org/licenses/LICENSE-2.0
[MIT]: https://opensource.org/licenses/MIT