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