From f64411c4cd4f8b8959c0e975de532e5e8438dfeb Mon Sep 17 00:00:00 2001
From: shannmu <shanmu1901@gmail.com>
Date: Wed, 14 Aug 2024 17:17:15 +0800
Subject: [PATCH] feat: Add custom completer for `cargo help <TAB>`

---
 src/bin/cargo/commands/help.rs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/bin/cargo/commands/help.rs b/src/bin/cargo/commands/help.rs
index a92f5d140bcb..f9f91cf7249e 100644
--- a/src/bin/cargo/commands/help.rs
+++ b/src/bin/cargo/commands/help.rs
@@ -15,7 +15,19 @@ const COMPRESSED_MAN: &[u8] = include_bytes!(concat!(env!("OUT_DIR"), "/man.tgz"
 pub fn cli() -> Command {
     subcommand("help")
         .about("Displays help for a cargo subcommand")
-        .arg(Arg::new("COMMAND").action(ArgAction::Set))
+        .arg(Arg::new("COMMAND").action(ArgAction::Set).add(
+            clap_complete::ArgValueCandidates::new(|| {
+                super::builtin()
+                    .iter()
+                    .map(|cmd| {
+                        let name = cmd.get_name();
+                        clap_complete::CompletionCandidate::new(name)
+                            .help(cmd.get_about().cloned())
+                            .hide(cmd.is_hide_set())
+                    })
+                    .collect()
+            }),
+        ))
 }
 
 pub fn exec(gctx: &mut GlobalContext, args: &ArgMatches) -> CliResult {