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//! Generates descriptors structure for unstable feature from Unstable Book
use std::fmt::Write;
use std::path::{Path, PathBuf};
use walkdir::WalkDir;
use xshell::{cmd, read_file};
use crate::codegen::{ensure_file_contents, project_root, reformat, Result};
pub(crate) fn generate_lint_completions() -> Result<()> {
if !project_root().join("./target/rust").exists() {
cmd!("git clone --depth=1 https://github.com/rust-lang/rust ./target/rust").run()?;
}
let mut contents = String::from("use crate::completions::attribute::LintCompletion;\n\n");
generate_descriptor(&mut contents, "./target/rust/src/doc/unstable-book/src".into())?;
contents.push('\n');
cmd!("curl http://rust-lang.github.io/rust-clippy/master/lints.json --output ./target/clippy_lints.json").run()?;
generate_descriptor_clippy(&mut contents, &Path::new("./target/clippy_lints.json"))?;
let contents = reformat(&contents)?;
let destination =
project_root().join("crates/ide_completion/src/generated_lint_completions.rs");
ensure_file_contents(destination.as_path(), &contents)?;
Ok(())
}
fn generate_descriptor(buf: &mut String, src_dir: PathBuf) -> Result<()> {
buf.push_str(r#"pub(super) const FEATURES: &[LintCompletion] = &["#);
buf.push('\n');
["language-features", "library-features"]
.iter()
.flat_map(|it| WalkDir::new(src_dir.join(it)))
.filter_map(|e| e.ok())
.filter(|entry| {
// Get all `.md ` files
entry.file_type().is_file() && entry.path().extension().unwrap_or_default() == "md"
})
.for_each(|entry| {
let path = entry.path();
let feature_ident = path.file_stem().unwrap().to_str().unwrap().replace("-", "_");
let doc = read_file(path).unwrap();
push_lint_completion(buf, &feature_ident, &doc);
});
buf.push_str("];\n");
Ok(())
}
#[derive(Default)]
struct ClippyLint {
help: String,
id: String,
}
fn generate_descriptor_clippy(buf: &mut String, path: &Path) -> Result<()> {
let file_content = read_file(path)?;
let mut clippy_lints: Vec<ClippyLint> = vec![];
for line in file_content.lines().map(|line| line.trim()) {
if line.starts_with(r#""id":"#) {
let clippy_lint = ClippyLint {
id: line
.strip_prefix(r#""id": ""#)
.expect("should be prefixed by id")
.strip_suffix(r#"","#)
.expect("should be suffixed by comma")
.into(),
help: String::new(),
};
clippy_lints.push(clippy_lint)
} else if line.starts_with(r#""What it does":"#) {
// Typical line to strip: "What is doest": "Here is my useful content",
let prefix_to_strip = r#""What it does": ""#;
let suffix_to_strip = r#"","#;
let clippy_lint = clippy_lints.last_mut().expect("clippy lint must already exist");
clippy_lint.help = line
.strip_prefix(prefix_to_strip)
.expect("should be prefixed by what it does")
.strip_suffix(suffix_to_strip)
.expect("should be suffixed by comma")
.into();
}
}
buf.push_str(r#"pub(super) const CLIPPY_LINTS: &[LintCompletion] = &["#);
buf.push('\n');
clippy_lints.into_iter().for_each(|clippy_lint| {
let lint_ident = format!("clippy::{}", clippy_lint.id);
let doc = clippy_lint.help;
push_lint_completion(buf, &lint_ident, &doc);
});
buf.push_str("];\n");
Ok(())
}
fn push_lint_completion(buf: &mut String, label: &str, description: &str) {
writeln!(
buf,
r###" LintCompletion {{
label: "{}",
description: r##"{}"##
}},"###,
label, description
)
.unwrap();
}
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