feat(cli): add --quiet to rustup toolchain list

Author: rami3l

src/cli/common.rs

@@ -400,7 +400,7 @@ pub(super) fn list_items(
     Ok(utils::ExitCode(0))
 }
 
-pub(crate) fn list_toolchains(cfg: &Cfg, verbose: bool) -> Result<utils::ExitCode> {
+pub(crate) fn list_toolchains(cfg: &Cfg, verbose: bool, quiet: bool) -> Result<utils::ExitCode> {
     let toolchains = cfg.list_toolchains()?;
     if toolchains.is_empty() {
         writeln!(process().stdout().lock(), "no installed toolchains")?;
@@ -425,6 +425,7 @@ pub(crate) fn list_toolchains(cfg: &Cfg, verbose: bool) -> Result<utils::ExitCod
                 is_default_toolchain,
                 is_active_toolchain,
                 verbose,
+                quiet,
             )
             .context("Failed to list toolchains' directories")?;
         }
@@ -436,7 +437,13 @@ pub(crate) fn list_toolchains(cfg: &Cfg, verbose: bool) -> Result<utils::ExitCod
         is_default: bool,
         is_active: bool,
         verbose: bool,
+        quiet: bool,
     ) -> Result<()> {
+        if quiet {
+            writeln!(process().stdout().lock(), "{toolchain}")?;
+            return Ok(());
+        }
+
         let toolchain_path = cfg.toolchains_dir.join(toolchain);
         let toolchain_meta = fs::symlink_metadata(&toolchain_path)?;
         let toolchain_path = if verbose {

src/cli/rustup_mode.rs

@@ -293,6 +293,10 @@ enum ToolchainSubcmd {
         /// Enable verbose output with toolchain information
         #[arg(short, long)]
         verbose: bool,
+
+        /// Force the output to be a single column
+        #[arg(short, long, conflicts_with = "verbose")]
+        quiet: bool,
     },
 
     /// Install or update a given toolchain
@@ -625,8 +629,8 @@ pub async fn main(current_dir: PathBuf) -> Result<utils::ExitCode> {
         }
         RustupSubcmd::Toolchain { subcmd } => match subcmd {
             ToolchainSubcmd::Install { opts } => update(cfg, opts).await,
-            ToolchainSubcmd::List { verbose } => {
-                handle_epipe(common::list_toolchains(cfg, verbose))
+            ToolchainSubcmd::List { verbose, quiet } => {
+                handle_epipe(common::list_toolchains(cfg, verbose, quiet))
             }
             ToolchainSubcmd::Link { toolchain, path } => {
                 toolchain_link(cfg, &toolchain, &path).await

tests/suite/cli-ui/rustup/rustup_toolchain_cmd_list_cmd_help_flag_stdout.toml

@@ -8,6 +8,7 @@ Usage: rustup[EXE] toolchain list [OPTIONS]
 
 Options:
   -v, --verbose  Enable verbose output with toolchain information
+  -q, --quiet    Force the output to be a single column
   -h, --help     Print help
 """
 stderr = ""

tests/suite/cli_rustup.rs

@@ -841,6 +841,20 @@ fn list_default_toolchain() {
     });
 }
 
+#[test]
+fn list_default_toolchain_quiet() {
+    test(&|config| {
+        config.with_scenario(Scenario::SimpleV2, &|config| {
+            config.expect_ok(&["rustup", "default", "nightly"]);
+            config.expect_ok_ex(
+                &["rustup", "toolchain", "list", "--quiet"],
+                for_host!("nightly-{0}\n"),
+                r"",
+            );
+        })
+    });
+}
+
 #[test]
 fn list_no_default_toolchain() {
     test(&|config| {