Enable nightly lints via cli args

Author: Jarcho

clippy_dev/src/update_lints.rs

@@ -114,6 +114,11 @@ fn generate_lint_files(
         update_mode,
         &gen_deprecated(deprecated_lints),
     );
+    process_file(
+        "src/main.warn_nightly_args.rs",
+        update_mode,
+        &gen_warn_nightly_lints(lints),
+    );
 
     let all_group_lints = usable_lints.iter().filter(|l| {
         matches!(
@@ -780,6 +785,19 @@ fn gen_renamed_lints_list(lints: &[RenamedLint]) -> String {
     res
 }
 
+fn gen_warn_nightly_lints(lints: &[Lint]) -> String {
+    let mut res: String = GENERATED_FILE_COMMENT.into();
+    res.push_str("[\n");
+    for lint in lints
+        .iter()
+        .filter(|l| !l.has_version && !l.group.starts_with("internal"))
+    {
+        let _ = write!(res, "    \"-W\",\n    \"clippy::{}\",\n", lint.name);
+    }
+    res.push_str("]\n");
+    res
+}
+
 /// Gathers all lints defined in `clippy_lints/src`
 fn gather_all() -> (Vec<Lint>, Vec<DeprecatedLint>, Vec<RenamedLint>) {
     let mut lints = Vec::with_capacity(1000);

src/main.rs

@@ -1,7 +1,11 @@
+#![feature(rustc_private)]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 // warn on lints, that are included in `rust-lang/rust`s bootstrap
 #![warn(rust_2018_idioms, unused_lifetimes)]
 
+extern crate rustc_session;
+
+use rustc_session::config::nightly_options::is_nightly_build;
 use rustc_tools_util::VersionInfo;
 use std::env;
 use std::path::PathBuf;
@@ -132,6 +136,11 @@ impl ClippyCmd {
             .arg(self.cargo_subcommand)
             .args(&self.args);
 
+        if is_nightly_build(None) {
+            static ARGS: &[&str] = &include!("main.warn_nightly_args.rs");
+            cmd.args(ARGS);
+        }
+
         cmd
     }
 }

src/main.warn_nightly_args.rs

@@ -0,0 +1,6 @@
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+[
+]