build(ariadne): vendor clap

third_party/crates/clap-4.6.6/examples/multicall-hostname.rs

@@ -0,0 +1,17 @@
+use clap::Command;
+
+fn main() {
+    let cmd = Command::new(env!("CARGO_CRATE_NAME"))
+        .multicall(true)
+        .arg_required_else_help(true)
+        .subcommand_value_name("APPLET")
+        .subcommand_help_heading("APPLETS")
+        .subcommand(Command::new("hostname").about("show hostname part of FQDN"))
+        .subcommand(Command::new("dnsdomainname").about("show domain name part of FQDN"));
+
+    match cmd.get_matches().subcommand_name() {
+        Some("hostname") => println!("www"),
+        Some("dnsdomainname") => println!("example.com"),
+        _ => unreachable!("parser should ensure only valid subcommand names are used"),
+    }
+}