Add new tool for dumping feature status based on tidy

Author: yaahc

Cargo.toml

@@ -47,6 +47,7 @@ members = [
   "src/tools/coverage-dump",
   "src/tools/rustc-perf-wrapper",
   "src/tools/wasm-component-ld",
+  "src/tools/features-status-dump",
 ]
 
 exclude = [

src/bootstrap/src/core/build_steps/test.rs

@@ -1082,7 +1082,7 @@ HELP: to skip test's attempt to check tidiness, pass `--skip src/tools/tidy` to
         }
 
         builder.info("tidy check");
-        cmd.delay_failure().run(builder);
+        dbg!(cmd).delay_failure().run(builder);
 
         builder.info("x.py completions check");
         let [bash, zsh, fish, powershell] = ["x.py.sh", "x.py.zsh", "x.py.fish", "x.py.ps1"]

src/tools/features-status-dump/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "features-status-dump"
+version = "0.1.0"
+license = "MIT OR Apache-2.0"
+edition = "2021"
+
+[dependencies]
+serde = { version = "1.0.125", features = [ "derive" ] }
+serde_json = "1.0.59"
+tidy = { path = "../tidy" }

src/tools/features-status-dump/src/main.rs

@@ -0,0 +1,31 @@
+use std::collections::HashMap;
+use std::io::BufWriter;
+use std::{env, fs::File};
+use std::path::Path;
+use tidy::features::{collect_lang_features, collect_lib_features, Feature};
+
+#[derive(serde::Serialize)]
+struct FeaturesStatus {
+    lang_features_status: HashMap<String, Feature>,
+    lib_features_status: HashMap<String, Feature>,
+}
+
+fn main() {
+    let library_path_str = env::args_os().nth(1).expect("library/ path required");
+    let compiler_path_str = env::args_os().nth(2).expect("compiler/ path required");
+    let output_path_str = env::args_os().nth(3).expect("output path required");
+    let library_path = Path::new(&library_path_str);
+    let compiler_path = Path::new(&compiler_path_str);
+    let output_path = Path::new(&output_path_str);
+    let lang_features_status = collect_lang_features(compiler_path, &mut false);
+    let lib_features_status = collect_lib_features(library_path)
+        .into_iter()
+        .filter(|&(ref name, _)| !lang_features_status.contains_key(name))
+        .collect();
+    let features_status = FeaturesStatus {
+        lang_features_status, lib_features_status
+    };
+    let writer = File::create(output_path).expect("output path should be a valid path");
+    let writer = BufWriter::new(writer);
+    serde_json::to_writer_pretty(writer, &features_status).unwrap();
+}

src/tools/tidy/Cargo.toml

@@ -12,6 +12,7 @@ miropt-test-tools = { path = "../miropt-test-tools" }
 walkdir = "2"
 ignore = "0.4.18"
 semver = "1.0"
+serde = { version = "1.0.125", features = [ "derive" ] }
 termcolor = "1.1.3"
 rustc-hash = "2.0.0"
 fluent-syntax = "0.11.1"

src/tools/tidy/src/features.rs

@@ -27,6 +27,7 @@ const FEATURE_GROUP_START_PREFIX: &str = "// feature-group-start";
 const FEATURE_GROUP_END_PREFIX: &str = "// feature-group-end";
 
 #[derive(Debug, PartialEq, Clone)]
+#[derive(serde::Serialize)]
 pub enum Status {
     Accepted,
     Removed,
@@ -45,6 +46,7 @@ impl fmt::Display for Status {
 }
 
 #[derive(Debug, Clone)]
+#[derive(serde::Serialize)]
 pub struct Feature {
     pub level: Status,
     pub since: Option<Version>,

src/tools/tidy/src/features/version.rs

@@ -8,6 +8,7 @@ mod tests;
 pub const VERSION_PLACEHOLDER: &str = "CURRENT_RUSTC_VERSION";
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(serde::Serialize)]
 pub enum Version {
     Explicit { parts: [u32; 3] },
     CurrentPlaceholder,