code-rust-cli

name	code:rust-cli
description	Build Rust CLI apps with Clap derive. Subcommands, colorized output, progress bars, config, error handling. <example> Context: User is creating a Rust CLI user: "create a CLI tool for file processing" </example> <example> Context: User needs CLI patterns user: "add subcommands to this clap app" </example>

Rust CLI Development

Best practices for Rust command-line applications using Clap.

Framework: Clap (Derive)

use clap::{Parser, Subcommand};

#[derive(Parser)]
#[command(name = "myapp")]
#[command(about = "Does useful things", version, author)]
struct Cli {
    /// Enable verbose output
    #[arg(short, long, global = true)]
    verbose: bool,

    #[command(subcommand)]
    command: Commands,
}

#[derive(Subcommand)]
enum Commands {
    /// Process a file
    Process {
        /// Input file path
        file: PathBuf,
        /// Output file path
        #[arg(short, long)]
        output: Option<PathBuf>,
    },
    /// Show configuration
    Config {
        #[command(subcommand)]
        action: ConfigAction,
    },
}

fn main() -> anyhow::<()> {
      = Cli::();

     cli.command {
        Commands::Process { file, output } => {
            (&file, output.(), cli.verbose)?;
        }
        Commands::Config { action } =>  action {
            ConfigAction::Show => ()?,
            ConfigAction::Set { key, value } => (&key, &value)?,
        },
    }

    (())
}