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Auto merge of #13091 - Alexendoo:empty-line-after-rewrite, r=dswij
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Rewrite `empty_line_after_doc_comments` and `empty_line_after_outer_attr`, move them from `nursery` to `suspicious`

changelog: [`empty_line_after_doc_comments`], [`empty_line_after_outer_attr`]: rewrite and move them from `nursery` to `suspicious`

They now lint when there's a comment between the last attr/doc comment and the empty line, to cover the case:

```rust
/// Docs for `old_code
// fn old_code() {}

fn new_code() {}
```

When these lints or `suspicious_doc_comments` trigger we no longer trigger any other doc lint as a broad fix for #12917, reverts some of #13002 as the empty line lints cover it

I ended up not doing rust-lang/rust-clippy#12917 (comment) as I don't think it's needed
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bors committed Aug 25, 2024
2 parents 083e20a + 3474df6 commit ebcd6bc
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Showing 73 changed files with 1,563 additions and 872 deletions.
52 changes: 0 additions & 52 deletions clippy_lints/src/attrs/empty_line_after.rs
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95 changes: 0 additions & 95 deletions clippy_lints/src/attrs/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,6 @@ mod blanket_clippy_restriction_lints;
mod deprecated_cfg_attr;
mod deprecated_semver;
mod duplicated_attributes;
mod empty_line_after;
mod inline_always;
mod mixed_attributes_style;
mod non_minimal_cfg;
Expand Down Expand Up @@ -126,94 +125,6 @@ declare_clippy_lint! {
"use of `#[deprecated(since = \"x\")]` where x is not semver"
}

declare_clippy_lint! {
/// ### What it does
/// Checks for empty lines after outer attributes
///
/// ### Why is this bad?
/// Most likely the attribute was meant to be an inner attribute using a '!'.
/// If it was meant to be an outer attribute, then the following item
/// should not be separated by empty lines.
///
/// ### Known problems
/// Can cause false positives.
///
/// From the clippy side it's difficult to detect empty lines between an attributes and the
/// following item because empty lines and comments are not part of the AST. The parsing
/// currently works for basic cases but is not perfect.
///
/// ### Example
/// ```no_run
/// #[allow(dead_code)]
///
/// fn not_quite_good_code() { }
/// ```
///
/// Use instead:
/// ```no_run
/// // Good (as inner attribute)
/// #![allow(dead_code)]
///
/// fn this_is_fine() { }
///
/// // or
///
/// // Good (as outer attribute)
/// #[allow(dead_code)]
/// fn this_is_fine_too() { }
/// ```
#[clippy::version = "pre 1.29.0"]
pub EMPTY_LINE_AFTER_OUTER_ATTR,
nursery,
"empty line after outer attribute"
}

declare_clippy_lint! {
/// ### What it does
/// Checks for empty lines after documentation comments.
///
/// ### Why is this bad?
/// The documentation comment was most likely meant to be an inner attribute or regular comment.
/// If it was intended to be a documentation comment, then the empty line should be removed to
/// be more idiomatic.
///
/// ### Known problems
/// Only detects empty lines immediately following the documentation. If the doc comment is followed
/// by an attribute and then an empty line, this lint will not trigger. Use `empty_line_after_outer_attr`
/// in combination with this lint to detect both cases.
///
/// Does not detect empty lines after doc attributes (e.g. `#[doc = ""]`).
///
/// ### Example
/// ```no_run
/// /// Some doc comment with a blank line after it.
///
/// fn not_quite_good_code() { }
/// ```
///
/// Use instead:
/// ```no_run
/// /// Good (no blank line)
/// fn this_is_fine() { }
/// ```
///
/// ```no_run
/// // Good (convert to a regular comment)
///
/// fn this_is_fine_too() { }
/// ```
///
/// ```no_run
/// //! Good (convert to a comment on an inner attribute)
///
/// fn this_is_fine_as_well() { }
/// ```
#[clippy::version = "1.70.0"]
pub EMPTY_LINE_AFTER_DOC_COMMENTS,
nursery,
"empty line after documentation comments"
}

declare_clippy_lint! {
/// ### What it does
/// Checks for `warn`/`deny`/`forbid` attributes targeting the whole clippy::restriction category.
Expand Down Expand Up @@ -601,18 +512,12 @@ impl EarlyAttributes {

impl_lint_pass!(EarlyAttributes => [
DEPRECATED_CFG_ATTR,
EMPTY_LINE_AFTER_OUTER_ATTR,
EMPTY_LINE_AFTER_DOC_COMMENTS,
NON_MINIMAL_CFG,
DEPRECATED_CLIPPY_CFG_ATTR,
UNNECESSARY_CLIPPY_CFG,
]);

impl EarlyLintPass for EarlyAttributes {
fn check_item(&mut self, cx: &EarlyContext<'_>, item: &rustc_ast::Item) {
empty_line_after::check(cx, item);
}

fn check_attribute(&mut self, cx: &EarlyContext<'_>, attr: &Attribute) {
deprecated_cfg_attr::check(cx, attr, &self.msrv);
deprecated_cfg_attr::check_clippy(cx, attr);
Expand Down
4 changes: 2 additions & 2 deletions clippy_lints/src/declared_lints.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -49,8 +49,6 @@ pub static LINTS: &[&crate::LintInfo] = &[
crate::attrs::DEPRECATED_CLIPPY_CFG_ATTR_INFO,
crate::attrs::DEPRECATED_SEMVER_INFO,
crate::attrs::DUPLICATED_ATTRIBUTES_INFO,
crate::attrs::EMPTY_LINE_AFTER_DOC_COMMENTS_INFO,
crate::attrs::EMPTY_LINE_AFTER_OUTER_ATTR_INFO,
crate::attrs::INLINE_ALWAYS_INFO,
crate::attrs::MIXED_ATTRIBUTES_STYLE_INFO,
crate::attrs::NON_MINIMAL_CFG_INFO,
Expand Down Expand Up @@ -138,6 +136,8 @@ pub static LINTS: &[&crate::LintInfo] = &[
crate::doc::DOC_LINK_WITH_QUOTES_INFO,
crate::doc::DOC_MARKDOWN_INFO,
crate::doc::EMPTY_DOCS_INFO,
crate::doc::EMPTY_LINE_AFTER_DOC_COMMENTS_INFO,
crate::doc::EMPTY_LINE_AFTER_OUTER_ATTR_INFO,
crate::doc::MISSING_ERRORS_DOC_INFO,
crate::doc::MISSING_PANICS_DOC_INFO,
crate::doc::MISSING_SAFETY_DOC_INFO,
Expand Down
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