feat: add CLI structure with init, plan, and run subcommands

Co-Authored-By: Claude Sonnet 4.5 <[e-mail]>

Cargo.lock

···
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···
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···
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···
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···
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···
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···
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···
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···
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  "anyhow",
  "async-trait",
+ "clap",
+ "env_logger",
+ "log",
  "reqwest",
  "serde",
  "serde_json",
···
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···
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 [[package]]
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Cargo.toml

···
 anyhow = "1.0"
 async-trait = "0.1"
 serde_json = "1.0"
+clap = { version = "4.5", features = ["derive"] }
+log = "0.4"
+env_logger = "0.11"
 
 [dev-dependencies]
 tempfile = "3.15"

src/main.rs

···
 pub mod config;
 pub mod llm;
+pub mod spec;
 pub mod tools;
 
-fn main() {
-    println!("Hello, world!");
+use clap::{Parser, Subcommand};
+
+#[derive(Parser)]
+#[command(name = "rustagent")]
+#[command(about = "A Rust-based AI agent for task execution", long_about = None)]
+struct Cli {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    /// Initialize a new agent specification
+    Init {
+        /// Directory to store the specification
+        #[arg(long)]
+        spec_dir: Option<String>,
+    },
+    /// Create an execution plan from a specification
+    Plan {
+        /// Directory containing the specification
+        #[arg(long)]
+        spec_dir: Option<String>,
+    },
+    /// Execute a plan
+    Run {
+        /// Path to the specification file
+        spec_file: String,
+        /// Maximum number of iterations
+        #[arg(long)]
+        max_iterations: Option<usize>,
+    },
+}
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    env_logger::init();
+
+    let cli = Cli::parse();
+
+    match &cli.command {
+        Commands::Init { spec_dir } => {
+            let dir = spec_dir.clone().unwrap_or_else(|| ".".to_string());
+            println!("Initializing agent in directory: {}", dir);
+            // TODO: Implement initialization logic
+        }
+        Commands::Plan { spec_dir } => {
+            let dir = spec_dir.clone().unwrap_or_else(|| ".".to_string());
+            println!("Creating plan from spec directory: {}", dir);
+            // TODO: Implement plan creation logic
+        }
+        Commands::Run { spec_file, max_iterations } => {
+            println!("Running agent with spec: {}", spec_file);
+            if let Some(max_iter) = max_iterations {
+                println!("Maximum iterations: {}", max_iter);
+            }
+            // TODO: Implement execution logic
+        }
+    }
+
+    Ok(())
 }

tests/cli_test.rs

···
+use std::process::Command;
+
+#[test]
+fn test_cli_help() {
+    let output = Command::new("cargo")
+        .args(["run", "--", "--help"])
+        .output()
+        .unwrap();
+
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    assert!(stdout.contains("rustagent"));
+    assert!(stdout.contains("init"));
+    assert!(stdout.contains("plan"));
+    assert!(stdout.contains("run"));
+}