1 #![allow(clippy::filter_map)]
5 use std::io::prelude::*;
6 use std::path::{Path, PathBuf};
8 // This module takes an absolute path to a rustc repo and alters the dependencies to point towards
9 // the respective rustc subcrates instead of using extern crate xyz.
10 // This allows rust analyzer to analyze rustc internals and show proper information inside clippy
11 // code. See https://github.com/rust-analyzer/rust-analyzer/issues/3517 and https://github.com/rust-lang/rust-clippy/issues/5514 for details
13 pub fn run(rustc_path: Option<&str>) {
14 // we can unwrap here because the arg is required by clap
15 let rustc_path = PathBuf::from(rustc_path.unwrap());
16 assert!(rustc_path.is_dir(), "path is not a directory");
17 let rustc_source_basedir = rustc_path.join("compiler");
19 rustc_source_basedir.is_dir(),
20 "are you sure the path leads to a rustc repo?"
23 let clippy_root_manifest = fs::read_to_string("Cargo.toml").expect("failed to read ./Cargo.toml");
24 let clippy_root_lib_rs = fs::read_to_string("src/driver.rs").expect("failed to read ./src/driver.rs");
25 inject_deps_into_manifest(
26 &rustc_source_basedir,
28 &clippy_root_manifest,
31 .expect("Failed to inject deps into ./Cargo.toml");
33 let clippy_lints_manifest =
34 fs::read_to_string("clippy_lints/Cargo.toml").expect("failed to read ./clippy_lints/Cargo.toml");
35 let clippy_lints_lib_rs =
36 fs::read_to_string("clippy_lints/src/lib.rs").expect("failed to read ./clippy_lints/src/lib.rs");
37 inject_deps_into_manifest(
38 &rustc_source_basedir,
39 "clippy_lints/Cargo.toml",
40 &clippy_lints_manifest,
43 .expect("Failed to inject deps into ./clippy_lints/Cargo.toml");
46 fn inject_deps_into_manifest(
47 rustc_source_dir: &Path,
51 ) -> std::io::Result<()> {
52 // do not inject deps if we have aleady done so
53 if cargo_toml.contains("[target.'cfg(NOT_A_PLATFORM)'.dependencies]") {
55 "cargo dev ra_setup: warning: deps already found inside {}, doing nothing.",
61 let extern_crates = lib_rs
64 .filter(|line| line.starts_with("extern crate"))
65 // we have something like "extern crate foo;", we only care about the "foo"
67 // extern crate rustc_middle;
68 .map(|s| &s[13..(s.len() - 1)]);
70 let new_deps = extern_crates.map(|dep| {
71 // format the dependencies that are going to be put inside the Cargo.toml
73 "{dep} = {{ path = \"{source_path}/{dep}\" }}\n",
75 source_path = rustc_source_dir.display()
79 // format a new [dependencies]-block with the new deps we need to inject
80 let mut all_deps = String::from("[target.'cfg(NOT_A_PLATFORM)'.dependencies]\n");
81 new_deps.for_each(|dep_line| {
82 all_deps.push_str(&dep_line);
84 all_deps.push_str("\n[dependencies]\n");
86 // replace "[dependencies]" with
88 // dep1 = { path = ... }
89 // dep2 = { path = ... }
91 let new_manifest = cargo_toml.replacen("[dependencies]\n", &all_deps, 1);
93 // println!("{}", new_manifest);
94 let mut file = File::create(manifest_path)?;
95 file.write_all(new_manifest.as_bytes())?;
97 println!("Dependency paths injected: {}", manifest_path);