Trying an optional subcommand in Clap

neverclap/Cargo.lock

@@ -0,0 +1,323 @@
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neverclap/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "neverclap"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { version = "4.0.32", features = ["derive", "env"] }

neverclap/src/main.rs

@@ -0,0 +1,20 @@
+use clap::Parser;
+
+#[derive(clap::Subcommand, Debug)]
+enum Actions {
+    Generate,
+}
+
+#[derive(Parser, Debug)]
+struct Config {
+    #[command(subcommand)]
+    generate: Option<Actions>,
+
+    #[arg(short, long, env = "ENV_VAR")]
+    var: Option<String>,
+}
+
+fn main() {
+    let args = Config::parse();
+    println!("Args: {:?}", args)
+}