add clap_complete for completion support

Cargo.lock

@@ -158,6 +158,18 @@ dependencies = [
  "strsim",
 ]
 
+[[package]]
+name = "clap_complete"
+version = "4.5.54"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aad5b1b4de04fead402672b48897030eec1f3bfe1550776322f59f6d6e6a5677"
+dependencies = [
+ "clap",
+ "clap_lex",
+ "is_executable",
+ "shlex",
+]
+
 [[package]]
 name = "clap_derive"
 version = "4.5.40"
@@ -215,6 +227,7 @@ version = "0.1.0"
 dependencies = [
  "bytes",
  "clap",
+ "clap_complete",
  "env_logger",
  "eyre",
  "futures-util",
@@ -699,6 +712,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "is_executable"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4a1b5bad6f9072935961dfbf1cced2f3d129963d091b6f69f007fe04e758ae2"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "is_terminal_polyfill"
 version = "1.70.1"
@@ -1630,6 +1652,28 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows-link"
 version = "0.1.3"

Cargo.toml

@@ -6,6 +6,7 @@ edition = "2024"
 [dependencies]
 bytes = "1.10.1"
 clap = { version = "4.5.40", features = ["derive"] }
+clap_complete = { version = "4.5.54", features = ["unstable-dynamic"] }
 env_logger = "0.11.8"
 eyre = "0.6.12"
 futures-util = "0.3.31"

src/bin/dls.rs

@@ -1,4 +1,4 @@
-use clap::{Parser, Subcommand};
+use clap::{CommandFactory, Parser, Subcommand};
 use eyre::{format_err, Result};
 use futures_util::StreamExt;
 use tokio::io::AsyncWriteExt;
@@ -54,6 +54,8 @@ enum ClusterCommand {
 
 #[tokio::main(flavor = "current_thread")]
 async fn main() -> Result<()> {
+    clap_complete::CompleteEnv::with_factory(Cli::command).complete();
+
     let cli = Cli::parse();
 
     env_logger::builder()