Cleanup rustc_tool_util and add a convenient macro for build.rs

Cargo.toml

@@ -23,7 +23,7 @@ path = "src/driver.rs"
 [dependencies]
 clippy_lints = { path = "clippy_lints" }
 semver = "1.0"
-rustc_tools_util = "0.2.1"
+rustc_tools_util = {version = "0.2.1", path = "./rustc_tools_util"}
 tempfile = { version = "3.2", optional = true }
 termize = "0.1"
 
@@ -56,7 +56,7 @@ tokio = { version = "1", features = ["io-util"] }
 rustc-semver = "1.1"
 
 [build-dependencies]
-rustc_tools_util = "0.2.1"
+rustc_tools_util = {version = "0.2.1", path = "./rustc_tools_util"}
 
 [features]
 deny-warnings = ["clippy_lints/deny-warnings"]

build.rs

@@ -3,17 +3,5 @@ fn main() {
     println!("cargo:rustc-env=PROFILE={}", std::env::var("PROFILE").unwrap());
     // Don't rebuild even if nothing changed
     println!("cargo:rerun-if-changed=build.rs");
-    // forward git repo hashes we build at
-    println!(
-        "cargo:rustc-env=GIT_HASH={}",
-        rustc_tools_util::get_commit_hash().unwrap_or_default()
-    );
-    println!(
-        "cargo:rustc-env=COMMIT_DATE={}",
-        rustc_tools_util::get_commit_date().unwrap_or_default()
-    );
-    println!(
-        "cargo:rustc-env=RUSTC_RELEASE_CHANNEL={}",
-        rustc_tools_util::get_channel()
-    );
+    rustc_tools_util::setup_version_info!();
 }

rustc_tools_util/README.md

@@ -20,36 +20,29 @@ rustc_tools_util = "0.2.1"
 ````
 
 In `build.rs`, generate the data in your `main()`
-````rust
-fn main() {
-    println!(
-        "cargo:rustc-env=GIT_HASH={}",
-        rustc_tools_util::get_commit_hash().unwrap_or_default()
-    );
-    println!(
-        "cargo:rustc-env=COMMIT_DATE={}",
-        rustc_tools_util::get_commit_date().unwrap_or_default()
-    );
-    println!(
-        "cargo:rustc-env=RUSTC_RELEASE_CHANNEL={}",
-        rustc_tools_util::get_channel().unwrap_or_default()
-    );
-}
 
-````
+```rust
+fn main() {
+    rustc_tools_util::setup_version_info!();
+}
+```
 
 Use the version information in your main.rs
-````rust
-use rustc_tools_util::*;
 
+```rust
 fn show_version() {
     let version_info = rustc_tools_util::get_version_info!();
     println!("{}", version_info);
 }
-````
-This gives the following output in clippy:
-`clippy 0.0.212 (a416c5e 2018-12-14)`
+```
 
+This gives the following output in clippy:
+`clippy 0.1.66 (a28f3c8 2022-11-20)`
+
+## Repository
+
+This project is part of the rust-lang/rust-clippy repository. The source code
+can be found under `./rustc_tools_util/`.
 
 ## License
 

rustc_tools_util/src/lib.rs

@@ -2,19 +2,21 @@
 
 use std::env;
 
+/// This macro creates the version string during compilation from the
+/// current environment
 #[macro_export]
 macro_rules! get_version_info {
     () => {{
-        let major = env!("CARGO_PKG_VERSION_MAJOR").parse::<u8>().unwrap();
-        let minor = env!("CARGO_PKG_VERSION_MINOR").parse::<u8>().unwrap();
-        let patch = env!("CARGO_PKG_VERSION_PATCH").parse::<u16>().unwrap();
-        let crate_name = String::from(env!("CARGO_PKG_NAME"));
+        let major = std::env!("CARGO_PKG_VERSION_MAJOR").parse::<u8>().unwrap();
+        let minor = std::env!("CARGO_PKG_VERSION_MINOR").parse::<u8>().unwrap();
+        let patch = std::env!("CARGO_PKG_VERSION_PATCH").parse::<u16>().unwrap();
+        let crate_name = String::from(std::env!("CARGO_PKG_NAME"));
 
-        let host_compiler = option_env!("RUSTC_RELEASE_CHANNEL").map(str::to_string);
-        let commit_hash = option_env!("GIT_HASH").map(str::to_string);
-        let commit_date = option_env!("COMMIT_DATE").map(str::to_string);
+        let host_compiler = std::option_env!("RUSTC_RELEASE_CHANNEL").map(str::to_string);
+        let commit_hash = std::option_env!("GIT_HASH").map(str::to_string);
+        let commit_date = std::option_env!("COMMIT_DATE").map(str::to_string);
 
-        VersionInfo {
+        $crate::VersionInfo {
             major,
             minor,
             patch,
@@ -26,6 +28,24 @@ macro_rules! get_version_info {
     }};
 }
 
+/// This macro can be used in `build.rs` to automatically set the needed
+/// environment values, namely `GIT_HASH`, `COMMIT_DATE` and
+/// `RUSTC_RELEASE_CHANNEL`
+#[macro_export]
+macro_rules! setup_version_info {
+    () => {{
+        println!(
+            "cargo:rustc-env=GIT_HASH={}",
+            $crate::get_commit_hash().unwrap_or_default()
+        );
+        println!(
+            "cargo:rustc-env=COMMIT_DATE={}",
+            $crate::get_commit_date().unwrap_or_default()
+        );
+        println!("cargo:rustc-env=RUSTC_RELEASE_CHANNEL={}", $crate::get_channel());
+    }};
+}
+
 // some code taken and adapted from RLS and cargo
 pub struct VersionInfo {
     pub major: u8,

src/driver.rs

@@ -18,7 +18,6 @@ extern crate rustc_span;
 use rustc_interface::interface;
 use rustc_session::parse::ParseSess;
 use rustc_span::symbol::Symbol;
-use rustc_tools_util::VersionInfo;
 
 use std::borrow::Cow;
 use std::env;

src/main.rs

@@ -2,7 +2,6 @@
 // warn on lints, that are included in `rust-lang/rust`s bootstrap
 #![warn(rust_2018_idioms, unused_lifetimes)]
 
-use rustc_tools_util::VersionInfo;
 use std::env;
 use std::path::PathBuf;
 use std::process::{self, Command};

tests/versioncheck.rs

@@ -2,7 +2,6 @@
 #![warn(rust_2018_idioms, unused_lifetimes)]
 #![allow(clippy::single_match_else)]
 
-use rustc_tools_util::VersionInfo;
 use std::fs;
 
 #[test]