Fix crates using tidy programmatically

Author: Kobzol

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

@@ -5,6 +5,7 @@ use std::path::PathBuf;
 
 use anyhow::{Context, Result};
 use clap::Parser;
+use tidy::diagnostics::RunningCheck;
 use tidy::features::{Feature, collect_lang_features, collect_lib_features};
 
 #[derive(Debug, Parser)]
@@ -29,7 +30,7 @@ struct FeaturesStatus {
 fn main() -> Result<()> {
     let Cli { compiler_path, library_path, output_path } = Cli::parse();
 
-    let lang_features_status = collect_lang_features(&compiler_path, &mut false);
+    let lang_features_status = collect_lang_features(&compiler_path, &mut RunningCheck::new_noop());
     let lib_features_status = collect_lib_features(&library_path)
         .into_iter()
         .filter(|&(ref name, _)| !lang_features_status.contains_key(name))

src/tools/tidy/src/diagnostics.rs

@@ -146,6 +146,15 @@ pub struct RunningCheck {
 }
 
 impl RunningCheck {
+    /// Creates a new instance of a running check without going through the diag
+    /// context.
+    /// Useful if you want to run some functions from tidy without configuring
+    /// diagnostics.
+    pub fn new_noop() -> Self {
+        let ctx = DiagCtx::new(Path::new(""), false);
+        ctx.start_check("noop")
+    }
+
     /// Immediately output an error and mark the check as failed.
     pub fn error<T: Display>(&mut self, msg: T) {
         self.mark_as_bad();

src/tools/unstable-book-gen/src/main.rs

@@ -5,6 +5,7 @@ use std::env;
 use std::fs::{self, write};
 use std::path::Path;
 
+use tidy::diagnostics::RunningCheck;
 use tidy::features::{Features, collect_env_vars, collect_lang_features, collect_lib_features};
 use tidy::t;
 use tidy::unstable_book::{
@@ -122,7 +123,7 @@ fn main() {
     let src_path = Path::new(&src_path_str);
     let dest_path = Path::new(&dest_path_str);
 
-    let lang_features = collect_lang_features(compiler_path, &mut false);
+    let lang_features = collect_lang_features(compiler_path, &mut RunningCheck::new_noop());
     let lib_features = collect_lib_features(library_path)
         .into_iter()
         .filter(|&(ref name, _)| !lang_features.contains_key(name))