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https://github.com/rust-lang/rust-clippy
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106 lines
3.4 KiB
Markdown
106 lines
3.4 KiB
Markdown
## `cargo lintcheck`
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Runs clippy on a fixed set of crates read from
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`lintcheck/lintcheck_crates.toml` and saves logs of the lint warnings into the
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repo. We can then check the diff and spot new or disappearing warnings.
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From the repo root, run:
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```
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cargo run --target-dir lintcheck/target --manifest-path lintcheck/Cargo.toml
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```
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or
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```
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cargo lintcheck
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```
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By default, the logs will be saved into
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`lintcheck-logs/lintcheck_crates_logs.txt`.
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You can set a custom sources.toml by adding `--crates-toml custom.toml` or using
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`LINTCHECK_TOML="custom.toml"` where `custom.toml` must be a relative path from
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the repo root.
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The results will then be saved to `lintcheck-logs/custom_logs.toml`.
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The `custom.toml` file may be built using <https://crates.io> recently most
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downloaded crates by using the `popular-crates` binary from the `lintcheck`
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directory. For example, to retrieve the 100 recently most downloaded crates:
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```
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cargo run --release --bin popular-crates -- -n 100 custom.toml
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```
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### Configuring the Crate Sources
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The sources to check are saved in a `toml` file. There are three types of
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sources.
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1. Crates-io Source
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```toml
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bitflags = {name = "bitflags", versions = ['1.2.1']}
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```
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Requires a "name" and one or multiple "versions" to be checked.
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2. `git` Source
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````toml
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puffin = {name = "puffin", git_url = "https://github.com/EmbarkStudios/puffin", git_hash = "02dd4a3"}
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````
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Requires a name, the url to the repo and unique identifier of a commit,
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branch or tag which is checked out before linting. There is no way to always
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check `HEAD` because that would lead to changing lint-results as the repo
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would get updated. If `git_url` or `git_hash` is missing, an error will be
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thrown.
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3. Local Dependency
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```toml
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clippy = {name = "clippy", path = "/home/user/clippy"}
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```
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For when you want to add a repository that is not published yet.
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#### Command Line Options (optional)
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```toml
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bitflags = {name = "bitflags", versions = ['1.2.1'], options = ['-Wclippy::pedantic', '-Wclippy::cargo']}
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```
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It is possible to specify command line options for each crate. This makes it
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possible to only check a crate for certain lint groups. If no options are
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specified, the lint groups `clippy::all`, `clippy::pedantic`, and
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`clippy::cargo` are checked. If an empty array is specified only `clippy::all`
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is checked.
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**Note:** `-Wclippy::all` is always enabled by default, unless `-Aclippy::all`
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is explicitly specified in the options.
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### Fix mode
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You can run `cargo lintcheck --fix` which will run Clippy with `--fix` and
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print a warning if Clippy's suggestions fail to apply (if the resulting code does not build).
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This lets us spot bad suggestions or false positives automatically in some cases.
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> Note: Fix mode implies `--all-targets`, so it can fix as much code as it can.
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Please note that the target dir should be cleaned afterwards since clippy will modify
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the downloaded sources which can lead to unexpected results when running lintcheck again afterwards.
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### Recursive mode
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You can run `cargo lintcheck --recursive` to also run Clippy on the dependencies
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of the crates listed in the crates source `.toml`. e.g. adding `rand 0.8.5`
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would also lint `rand_core`, `rand_chacha`, etc.
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Particularly slow crates in the dependency graph can be ignored using
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`recursive.ignore`:
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```toml
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[crates]
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cargo = {name = "cargo", versions = ['0.64.0']}
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[recursive]
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ignore = [
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"unicode-normalization",
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]
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```
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