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Generate default lint groups

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This commit is contained in:
Lukas Wirth 2021-06-04 18:55:08 +02:00
parent 343df88ac7
commit 0b9ba4977e
2 changed files with 53 additions and 9 deletions
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33
xtask/src/codegen/gen_lint_completions.rs
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@ -1,4 +1,5 @@
//! Generates descriptors structure for unstable feature from Unstable Book
use std::borrow::Cow;
use std::fmt::Write;
use std::path::{Path, PathBuf};
@ -38,22 +39,36 @@ pub(crate) fn generate_lint_completions() -> Result<()> {
fn generate_lint_descriptor(buf: &mut String) -> Result<()> {
let stdout = cmd!("rustc -W help").read()?;
let start = stdout.find("---- ------- -------").ok_or_else(|| anyhow::format_err!(""))?;
let end =
stdout.rfind("Lint groups provided by rustc:").ok_or_else(|| anyhow::format_err!(""))?;
let start_lints =
stdout.find("---- ------- -------").ok_or_else(|| anyhow::format_err!(""))?;
let start_lint_groups =
stdout.find("---- ---------").ok_or_else(|| anyhow::format_err!(""))?;
let end_lints =
stdout.find("Lint groups provided by rustc:").ok_or_else(|| anyhow::format_err!(""))?;
let end_lint_groups = stdout
.find("Lint tools like Clippy can provide additional lints and lint groups.")
.ok_or_else(|| anyhow::format_err!(""))?;
buf.push_str(r#"pub const DEFAULT_LINTS: &[Lint] = &["#);
buf.push('\n');
let mut lints = stdout[start..end]
let mut lints = stdout[start_lints..end_lints]
.lines()
.filter(|l| !l.is_empty())
.flat_map(|line| {
let (name, rest) = line.trim().split_once(char::is_whitespace)?;
let (_default_level, description) = rest.trim().split_once(char::is_whitespace)?;
Some((name.trim(), description.trim()))
.map(|line| {
let (name, rest) = line.trim().split_once(char::is_whitespace).unwrap();
let (_default_level, description) =
rest.trim().split_once(char::is_whitespace).unwrap();
(name.trim(), Cow::Borrowed(description.trim()))
})
.collect::<Vec<_>>();
lints.extend(stdout[start_lint_groups..end_lint_groups].lines().filter(|l| !l.is_empty()).map(
|line| {
let (name, lints) = line.trim().split_once(char::is_whitespace).unwrap();
(name.trim(), format!("lint group for: {}", lints.trim()).into())
},
));
lints.sort_by(|(ident, _), (ident2, _)| ident.cmp(ident2));
lints.into_iter().for_each(|(name, description)| push_lint_completion(buf, name, description));
lints.into_iter().for_each(|(name, description)| push_lint_completion(buf, name, &description));
buf.push_str("];\n");
Ok(())
}