Rollup merge of #126856 - onur-ozkan:remove-rls, r=clubby789

remove deprecated tool `rls`

This tool has been deprecated for two years and now it only gives warning without doing anything useful.

Zulip discussion: https://rust-lang.zulipchat.com/#narrow/stream/241545-t-release/topic/excluding.20rls.20from.20the.20release

try-job: x86_64-gnu-distcheck

src/tools/build-manifest/src/main.rs

@@ -386,7 +386,6 @@ impl Builder {
         // NOTE: this profile is effectively deprecated; do not add new components to it.
         let mut complete = default;
         complete.extend([
-            Rls,
             RustAnalyzer,
             RustSrc,
             LlvmTools,
@@ -475,7 +474,6 @@ impl Builder {
                 // but might be marked as unavailable if they weren't built.
                 PkgType::Clippy
                 | PkgType::Miri
-                | PkgType::Rls
                 | PkgType::RustAnalyzer
                 | PkgType::Rustfmt
                 | PkgType::LlvmTools

src/tools/build-manifest/src/versions.rs

@@ -51,7 +51,6 @@ pkg_type! {
     Cargo = "cargo",
     HtmlDocs = "rust-docs",
     RustAnalysis = "rust-analysis",
-    Rls = "rls"; preview = true,
     RustAnalyzer = "rust-analyzer"; preview = true,
     Clippy = "clippy"; preview = true,
     Rustfmt = "rustfmt"; preview = true,
@@ -77,7 +76,6 @@ impl PkgType {
     fn should_use_rust_version(&self) -> bool {
         match self {
             PkgType::Cargo => false,
-            PkgType::Rls => false,
             PkgType::RustAnalyzer => false,
             PkgType::Clippy => false,
             PkgType::Rustfmt => false,
@@ -118,7 +116,6 @@ impl PkgType {
             HtmlDocs => HOSTS,
             JsonDocs => HOSTS,
             RustSrc => &["*"],
-            Rls => HOSTS,
             RustAnalyzer => HOSTS,
             Clippy => HOSTS,
             Miri => HOSTS,

src/tools/rls/Cargo.toml

@@ -1,8 +0,0 @@
-[package]
-name = "rls"
-version = "2.0.0"
-edition = "2021"
-license = "Apache-2.0/MIT"
-
-[dependencies]
-serde_json = "1.0.83"

src/tools/rls/README.md

@@ -1,6 +0,0 @@
-# RLS Stub
-
-RLS has been replaced with [rust-analyzer](https://rust-analyzer.github.io/).
-
-This directory contains a stub which replaces RLS with a simple LSP server
-which only displays an alert to the user that RLS is no longer available.

src/tools/rls/src/main.rs

@@ -1,102 +0,0 @@
-//! RLS stub.
-//!
-//! This is a small stub that replaces RLS to alert the user that RLS is no
-//! longer available.
-
-use std::error::Error;
-use std::io::{BufRead, Write};
-
-use serde_json::Value;
-
-const ALERT_MSG: &str = "\
-RLS is no longer available as of Rust 1.65.
-Consider migrating to rust-analyzer instead.
-See https://rust-analyzer.github.io/ for installation instructions.
-";
-
-fn main() {
-    if let Err(e) = run() {
-        eprintln!("error: {e}");
-        std::process::exit(1);
-    }
-}
-
-struct Message {
-    method: Option<String>,
-}
-
-fn run() -> Result<(), Box<dyn Error>> {
-    let mut stdin = std::io::stdin().lock();
-    let mut stdout = std::io::stdout().lock();
-
-    let init = read_message(&mut stdin)?;
-    if init.method.as_deref() != Some("initialize") {
-        return Err(format!("expected initialize, got {:?}", init.method).into());
-    }
-    // No response, the LSP specification says that `showMessageRequest` may
-    // be posted before during this phase.
-
-    // message_type 1 is "Error"
-    let alert = serde_json::json!({
-        "jsonrpc": "2.0",
-        "id": 1,
-        "method": "window/showMessageRequest",
-        "params": {
-            "message_type": "1",
-            "message": ALERT_MSG
-        }
-    });
-    write_message_raw(&mut stdout, serde_json::to_string(&alert).unwrap())?;
-
-    loop {
-        let message = read_message(&mut stdin)?;
-        if message.method.as_deref() == Some("shutdown") {
-            std::process::exit(0);
-        }
-    }
-}
-
-fn read_message_raw<R: BufRead>(reader: &mut R) -> Result<String, Box<dyn Error>> {
-    let mut content_length: usize = 0;
-
-    // Read headers.
-    loop {
-        let mut line = String::new();
-        reader.read_line(&mut line)?;
-        if line.is_empty() {
-            return Err("remote disconnected".into());
-        }
-        if line == "\r\n" {
-            break;
-        }
-        if line.to_lowercase().starts_with("content-length:") {
-            let value = &line[15..].trim();
-            content_length = usize::from_str_radix(value, 10)?;
-        }
-    }
-    if content_length == 0 {
-        return Err("no content-length".into());
-    }
-
-    let mut buffer = vec![0; content_length];
-    reader.read_exact(&mut buffer)?;
-    let content = String::from_utf8(buffer)?;
-
-    Ok(content)
-}
-
-fn read_message<R: BufRead>(reader: &mut R) -> Result<Message, Box<dyn Error>> {
-    let m = read_message_raw(reader)?;
-    match serde_json::from_str::<Value>(&m) {
-        Ok(message) => Ok(Message {
-            method: message.get("method").and_then(|value| value.as_str().map(String::from)),
-        }),
-        Err(e) => Err(format!("failed to parse message {m}\n{e}").into()),
-    }
-}
-
-fn write_message_raw<W: Write>(mut writer: W, output: String) -> Result<(), Box<dyn Error>> {
-    write!(writer, "Content-Length: {}\r\n\r\n{}", output.len(), output)?;
-    writer.flush()?;
-    Ok(())
-}

src/tools/tidy/src/walk.rs

@@ -32,8 +32,6 @@ pub fn filter_dirs(path: &Path) -> bool {
         "src/doc/rustc-dev-guide",
         "src/doc/reference",
         "src/gcc",
-        // Filter RLS output directories
-        "target/rls",
         "src/bootstrap/target",
         "vendor",
     ];