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Link rustdoc lint docs to the rustdoc book.

This commit is contained in:
Eric Huss 2020-09-11 08:55:59 -07:00
parent 45c1e0ae07
commit ce014be0b9
5 changed files with 88 additions and 158 deletions
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138
compiler/rustc_session/src/lint/builtin.rs
View File

@ -1817,35 +1817,10 @@ declare_lint! {
declare_lint! {
/// The `broken_intra_doc_links` lint detects failures in resolving
/// intra-doc link targets. This is a `rustdoc` only lint, and only works
/// on the [**nightly channel**].
/// intra-doc link targets. This is a `rustdoc` only lint, see the
/// documentation in the [rustdoc book].
///
/// [**nightly channel**]: https://doc.rust-lang.org/book/appendix-07-nightly-rust.html
///
/// ### Example
///
/// ```rust,rustdoc
/// /// This is a doc comment.
/// ///
/// /// See also [`bar`].
/// pub fn foo() {
/// }
/// ```
///
/// {{produces}}
///
/// ### Explanation
///
/// `rustdoc` allows [linking to items by name][intra] which will
/// automatically generate links in the documentation to the item. This
/// lint is issued when `rustdoc` is unable to find the named item. Check
/// that the name is correct, that it is in scope, or if you need to
/// qualify it with a path. If you intended to have square brackets appear
/// literally in the text, surround the brackets with backticks such as ``
/// `[example]` `` to indicate a code span, or prefix it with a backslash
/// such as `\[example]`.
///
/// [intra]: https://doc.rust-lang.org/nightly/rustdoc/unstable-features.html#linking-to-items-by-name
/// [rustdoc book]: ../../../rustdoc/lints.html#broken_intra_doc_links
pub BROKEN_INTRA_DOC_LINKS,
Warn,
"failures in resolving intra-doc link targets"
@ -1854,27 +1829,9 @@ declare_lint! {
declare_lint! {
/// The `invalid_codeblock_attributes` lint detects code block attributes
/// in documentation examples that have potentially mis-typed values. This
/// is a `rustdoc` only lint.
/// is a `rustdoc` only lint, see the documentation in the [rustdoc book].
///
/// ### Example
///
/// ```rust,rustdoc
/// /// Example.
/// ///
/// /// ```should-panic
/// /// assert_eq!(1, 2);
/// /// ```
/// pub fn foo() {}
/// ```
///
/// {{produces}}
///
/// ### Explanation
///
/// This lint is issued when `rustdoc` detects an example code block
/// attribute that appears similar to a valid one. In the example above,
/// the correct form is `should_panic`. This helps detect typo mistakes
/// for some common attributes.
/// [rustdoc book]: ../../../rustdoc/lints.html#invalid_codeblock_attributes
pub INVALID_CODEBLOCK_ATTRIBUTES,
Warn,
"codeblock attribute looks a lot like a known one"
@ -1882,24 +1839,10 @@ declare_lint! {
declare_lint! {
/// The `missing_crate_level_docs` lint detects if documentation is
/// missing at the crate root. This is a `rustdoc` only lint. This is a
/// `rustdoc` only lint.
/// missing at the crate root. This is a `rustdoc` only lint, see the
/// documentation in the [rustdoc book].
///
/// ### Example
///
/// ```rust,rustdoc
/// #![deny(missing_crate_level_docs)]
/// ```
///
/// {{produces}}
///
/// ### Explanation
///
/// This lint causes `rustdoc` to check if the crate root is missing
/// documentation. This is currently "allow" by default, but it is
/// intended to make this a warning in the future. This is intended as a
/// means to introduce new users on *how* to document their crate by
/// pointing them to some instructions on how to get started.
/// [rustdoc book]: ../../../rustdoc/lints.html#missing_crate_level_docs
pub MISSING_CRATE_LEVEL_DOCS,
Allow,
"detects crates with no crate-level documentation"
@ -1908,43 +1851,9 @@ declare_lint! {
declare_lint! {
/// The `missing_doc_code_examples` lint detects publicly-exported items
/// without code samples in their documentation. This is a `rustdoc` only
/// lint, and only works on the [**nightly channel**].
/// lint, see the documentation in the [rustdoc book].
///
/// [**nightly channel**]: https://doc.rust-lang.org/book/appendix-07-nightly-rust.html
///
/// ### Example
///
/// ```rust,rustdoc
/// #![warn(missing_doc_code_examples)]
///
/// /// There is no code example!
/// pub fn no_code_example() {}
/// ```
///
/// {{produces}}
///
/// ### Explanation
///
/// This lint is to ensure a high level of quality for documentation. Code
/// examples can be very useful to see how to use an API. To add an
/// example, include a markdown code block with an example of how to use
/// the item, such as:
///
/// ```rust
/// /// Adds one to the number given.
/// ///
/// /// # Examples
/// ///
/// /// ```
/// /// let arg = 5;
/// /// let answer = my_crate::add_one(arg);
/// ///
/// /// assert_eq!(6, answer);
/// /// ```
/// pub fn add_one(x: i32) -> i32 {
/// x + 1
/// }
/// ```
/// [rustdoc book]: ../../../rustdoc/lints.html#missing_doc_code_examples
pub MISSING_DOC_CODE_EXAMPLES,
Allow,
"detects publicly-exported items without code samples in their documentation"
@ -1952,31 +1861,10 @@ declare_lint! {
declare_lint! {
/// The `private_doc_tests` lint detects code samples in docs of private
/// items not documented by `rustdoc`. This is a `rustdoc` only lint.
/// items not documented by `rustdoc`. This is a `rustdoc` only lint, see
/// the documentation in the [rustdoc book].
///
/// ### Example
///
/// ```rust,rustdoc
/// #![deny(private_doc_tests)]
///
/// mod foo {
/// /// private doc test
/// ///
/// /// ```
/// /// assert!(false);
/// /// ```
/// fn bar() {}
/// }
/// ```
///
/// {{produces}}
///
/// ### Explanation
///
/// Because documentation examples link against the public API of the
/// crate, it is not possible for an example to access a private item.
/// This means it was likely a mistake to add a code example to a private
/// item.
/// [rustdoc book]: ../../../rustdoc/lints.html#private_doc_tests
pub PRIVATE_DOC_TESTS,
Allow,
"detects code samples in docs of private items not documented by rustdoc"

3
src/bootstrap/doc.rs
View File

@ -756,7 +756,6 @@ impl Step for RustcBook {
// The tool runs `rustc` for extracting output examples, so it needs a
// functional sysroot.
builder.ensure(compile::Std { compiler: self.compiler, target: self.target });
let rustdoc = builder.rustdoc(self.compiler);
let mut cmd = builder.tool_cmd(Tool::LintDocs);
cmd.arg("--src");
cmd.arg(builder.src.join("compiler"));
@ -764,8 +763,6 @@ impl Step for RustcBook {
cmd.arg(&out_listing);
cmd.arg("--rustc");
cmd.arg(rustc);
cmd.arg("--rustdoc");
cmd.arg(rustdoc);
if builder.config.verbose() {
cmd.arg("--verbose");
}

58
src/doc/rustdoc/src/lints.md
View File

@ -49,6 +49,30 @@ warning: missing documentation for a function
| ^^^^^^^^^^^^^^^^^^^^^
```
## missing_crate_level_docs
This lint is **allowed by default**. It detects if there is no documentation
at the crate root. For example:
```rust
#![warn(missing_crate_level_docs)]
```
This will generate the following warning:
```text
warning: no documentation found for this crate's top-level module
|
= help: The following guide may be of use:
https://doc.rust-lang.org/nightly/rustdoc/how-to-write-documentation.html
```
This is currently "allow" by default, but it is intended to make this a
warning in the future. This is intended as a means to introduce new users on
*how* to document their crate by pointing them to some instructions on how to
get started, without providing overwhelming warnings like `missing_docs`
might.
## missing_doc_code_examples
This lint is **allowed by default** and is **nightly-only**. It detects when a documentation block
@ -117,3 +141,37 @@ warning: Documentation test in private item
8 | | /// ```
| |___________^
```
## invalid_codeblock_attributes
This lint **warns by default**. It detects code block attributes in
documentation examples that have potentially mis-typed values. For example:
```rust
/// Example.
///
/// ```should-panic
/// assert_eq!(1, 2);
/// ```
pub fn foo() {}
```
Which will give:
```text
warning: unknown attribute `should-panic`. Did you mean `should_panic`?
--> src/lib.rs:1:1
|
1 | / /// Example.
2 | | ///
3 | | /// ```should-panic
4 | | /// assert_eq!(1, 2);
5 | | /// ```
| |_______^
|
= note: `#[warn(invalid_codeblock_attributes)]` on by default
= help: the code block will either not be tested if not marked as a rust one or won't fail if it doesn't panic when running
```
In the example above, the correct form is `should_panic`. This helps detect
typo mistakes for some common attributes.

36
src/tools/lint-docs/src/lib.rs
View File

@ -15,6 +15,12 @@ struct Lint {
lineno: usize,
}
impl Lint {
fn doc_contains(&self, text: &str) -> bool {
self.doc.iter().any(|line| line.contains(text))
}
}
#[derive(Clone, Copy, PartialEq)]
enum Level {
Allow,
@ -37,12 +43,11 @@ pub fn extract_lint_docs(
src_path: &Path,
out_path: &Path,
rustc_path: &Path,
rustdoc_path: &Path,
verbose: bool,
) -> Result<(), Box<dyn Error>> {
let mut lints = gather_lints(src_path)?;
for lint in &mut lints {
generate_output_example(lint, rustc_path, rustdoc_path, verbose).map_err(|e| {
generate_output_example(lint, rustc_path, verbose).map_err(|e| {
format!(
"failed to test example in lint docs for `{}` in {}:{}: {}",
lint.name,
@ -197,7 +202,6 @@ fn lint_name(line: &str) -> Result<String, &'static str> {
fn generate_output_example(
lint: &mut Lint,
rustc_path: &Path,
rustdoc_path: &Path,
verbose: bool,
) -> Result<(), Box<dyn Error>> {
// Explicit list of lints that are allowed to not have an example. Please
@ -214,15 +218,19 @@ fn generate_output_example(
) {
return Ok(());
}
if lint.doc_contains("[rustdoc book]") && !lint.doc_contains("{{produces}}") {
// Rustdoc lints are documented in the rustdoc book, don't check these.
return Ok(());
}
check_style(lint)?;
replace_produces(lint, rustc_path, rustdoc_path, verbose)?;
replace_produces(lint, rustc_path, verbose)?;
Ok(())
}
/// Checks the doc style of the lint.
fn check_style(lint: &Lint) -> Result<(), Box<dyn Error>> {
for expected in &["### Example", "### Explanation", "{{produces}}"] {
if !lint.doc.iter().any(|line| line.contains(expected)) {
if !lint.doc_contains(expected) {
return Err(format!("lint docs should contain the line `{}`", expected).into());
}
}
@ -243,7 +251,6 @@ fn check_style(lint: &Lint) -> Result<(), Box<dyn Error>> {
fn replace_produces(
lint: &mut Lint,
rustc_path: &Path,
rustdoc_path: &Path,
verbose: bool,
) -> Result<(), Box<dyn Error>> {
let mut lines = lint.doc.iter_mut();
@ -283,14 +290,8 @@ fn replace_produces(
match lines.next() {
Some(line) if line.is_empty() => {}
Some(line) if line == "{{produces}}" => {
let output = generate_lint_output(
&lint.name,
&example,
&options,
rustc_path,
rustdoc_path,
verbose,
)?;
let output =
generate_lint_output(&lint.name, &example, &options, rustc_path, verbose)?;
line.replace_range(
..,
&format!(
@ -318,7 +319,6 @@ fn generate_lint_output(
example: &[&mut String],
options: &[&str],
rustc_path: &Path,
rustdoc_path: &Path,
verbose: bool,
) -> Result<String, Box<dyn Error>> {
if verbose {
@ -327,8 +327,7 @@ fn generate_lint_output(
let tempdir = tempfile::TempDir::new()?;
let tempfile = tempdir.path().join("lint_example.rs");
let mut source = String::new();
let is_rustdoc = options.contains(&"rustdoc");
let needs_main = !example.iter().any(|line| line.contains("fn main")) && !is_rustdoc;
let needs_main = !example.iter().any(|line| line.contains("fn main"));
// Remove `# ` prefix for hidden lines.
let unhidden =
example.iter().map(|line| if line.starts_with("# ") { &line[2..] } else { line });
@ -354,8 +353,7 @@ fn generate_lint_output(
}
fs::write(&tempfile, source)
.map_err(|e| format!("failed to write {}: {}", tempfile.display(), e))?;
let program = if is_rustdoc { rustdoc_path } else { rustc_path };
let mut cmd = Command::new(program);
let mut cmd = Command::new(rustc_path);
if options.contains(&"edition2015") {
cmd.arg("--edition=2015");
} else {

11
src/tools/lint-docs/src/main.rs
View File

@ -13,7 +13,6 @@ fn doit() -> Result<(), Box<dyn Error>> {
let mut src_path = None;
let mut out_path = None;
let mut rustc_path = None;
let mut rustdoc_path = None;
let mut verbose = false;
while let Some(arg) = args.next() {
match arg.as_str() {
@ -35,12 +34,6 @@ fn doit() -> Result<(), Box<dyn Error>> {
None => return Err("--rustc requires a value".into()),
};
}
"--rustdoc" => {
rustdoc_path = match args.next() {
Some(s) => Some(PathBuf::from(s)),
None => return Err("--rustdoc requires a value".into()),
};
}
"-v" | "--verbose" => verbose = true,
s => return Err(format!("unexpected argument `{}`", s).into()),
}
@ -54,14 +47,10 @@ fn doit() -> Result<(), Box<dyn Error>> {
if rustc_path.is_none() {
return Err("--rustc must be specified to the path of rustc".into());
}
if rustdoc_path.is_none() {
return Err("--rustdoc must be specified to the path of rustdoc".into());
}
lint_docs::extract_lint_docs(
&src_path.unwrap(),
&out_path.unwrap(),
&rustc_path.unwrap(),
&rustdoc_path.unwrap(),
verbose,
)
}