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#![allow(clippy::filter_map)]
use std::fs;
use std::fs::File;
use std::io::prelude::*;
use std::path::PathBuf;
// This module takes an absolute path to a rustc repo and alters the dependencies to point towards
// the respective rustc subcrates instead of using extern crate xyz.
// This allows rust analyzer to analyze rustc internals and show proper information inside clippy
// code. See https://github.com/rust-analyzer/rust-analyzer/issues/3517 and https://github.com/rust-lang/rust-clippy/issues/5514 for details
pub fn run(rustc_path: Option<&str>) {
// we can unwrap here because the arg is required here
let rustc_path = PathBuf::from(rustc_path.unwrap());
assert!(rustc_path.is_dir(), "path is not a directory");
let rustc_source_basedir = rustc_path.join("compiler");
assert!(
rustc_source_basedir.is_dir(),
"are you sure the path leads to a rustc repo?"
);
let clippy_root_manifest = fs::read_to_string("Cargo.toml").expect("failed to read ./Cargo.toml");
let clippy_root_lib_rs = fs::read_to_string("src/driver.rs").expect("failed to read ./src/driver.rs");
inject_deps_into_manifest(
&rustc_source_basedir,
"Cargo.toml",
&clippy_root_manifest,
&clippy_root_lib_rs,
)
.expect("Failed to inject deps into ./Cargo.toml");
let clippy_lints_manifest =
fs::read_to_string("clippy_lints/Cargo.toml").expect("failed to read ./clippy_lints/Cargo.toml");
let clippy_lints_lib_rs =
fs::read_to_string("clippy_lints/src/lib.rs").expect("failed to read ./clippy_lints/src/lib.rs");
inject_deps_into_manifest(
&rustc_source_basedir,
"clippy_lints/Cargo.toml",
&clippy_lints_manifest,
&clippy_lints_lib_rs,
)
.expect("Failed to inject deps into ./clippy_lints/Cargo.toml");
}
fn inject_deps_into_manifest(
rustc_source_dir: &PathBuf,
manifest_path: &str,
cargo_toml: &str,
lib_rs: &str,
) -> std::io::Result<()> {
let extern_crates = lib_rs
.lines()
// get the deps
.filter(|line| line.starts_with("extern crate"))
// we have something like "extern crate foo;", we only care about the "foo"
// ↓ ↓
// extern crate rustc_middle;
.map(|s| &s[13..(s.len() - 1)]);
let new_deps = extern_crates.map(|dep| {
// format the dependencies that are going to be put inside the Cargo.toml
format!(
"{dep} = {{ path = \"{source_path}/{dep}\" }}\n",
dep = dep,
source_path = rustc_source_dir.display()
)
});
// format a new [dependencies]-block with the new deps we need to inject
let mut all_deps = String::from("[target.'cfg(NOT_A_PLATFORM)'.dependencies]\n");
new_deps.for_each(|dep_line| {
all_deps.push_str(&dep_line);
});
all_deps.push_str("\n[dependencies]\n");
// replace "[dependencies]" with
// [dependencies]
// dep1 = { path = ... }
// dep2 = { path = ... }
// etc
let new_manifest = cargo_toml.replacen("[dependencies]\n", &all_deps, 1);
// println!("{}", new_manifest);
let mut file = File::create(manifest_path)?;
file.write_all(new_manifest.as_bytes())?;
println!("Dependency paths injected: {}", manifest_path);
Ok(())
}
|
