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skills/clap-patterns/templates/basic-parser.rs

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+/// Basic Parser Template with Clap Derive Macros
+///
+/// This template demonstrates:
+/// - Parser derive macro
+/// - Argument attributes (short, long, default_value)
+/// - PathBuf for file handling
+/// - Boolean flags
+/// - Doc comments as help text
+
+use clap::Parser;
+use std::path::PathBuf;
+
+#[derive(Parser)]
+#[command(name = "myapp")]
+#[command(author = "Your Name <you@example.com>")]
+#[command(version = "1.0.0")]
+#[command(about = "A simple CLI application", long_about = None)]
+struct Cli {
+    /// Input file to process
+    #[arg(short, long, value_name = "FILE")]
+    input: PathBuf,
+
+    /// Optional output file
+    #[arg(short, long)]
+    output: Option<PathBuf>,
+
+    /// Enable verbose output
+    #[arg(short, long)]
+    verbose: bool,
+
+    /// Number of items to process
+    #[arg(short = 'c', long, default_value_t = 10)]
+    count: usize,
+
+    /// Dry run mode (don't make changes)
+    #[arg(short = 'n', long)]
+    dry_run: bool,
+}
+
+fn main() {
+    let cli = Cli::parse();
+
+    if cli.verbose {
+        println!("Input file: {:?}", cli.input);
+        println!("Output file: {:?}", cli.output);
+        println!("Count: {}", cli.count);
+        println!("Dry run: {}", cli.dry_run);
+    }
+
+    // Check if input file exists
+    if !cli.input.exists() {
+        eprintln!("Error: Input file does not exist: {:?}", cli.input);
+        std::process::exit(1);
+    }
+
+    // Your processing logic here
+    println!("Processing {} with count {}...", cli.input.display(), cli.count);
+
+    if let Some(output) = cli.output {
+        if !cli.dry_run {
+            println!("Would write to: {}", output.display());
+        } else {
+            println!("Dry run: Skipping write to {}", output.display());
+        }
+    }
+}