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use std::path::PathBuf;
use clap::{Parser, Subcommand};
#[derive(Parser)]
#[command(version, about, long_about = None)]
struct Cli {
/// Optional name to operate on
name: Option<String>,
/// Sets a custom config file
#[arg(short, long, value_name = "FILE")]
config: Option<PathBuf>,
/// Turn debugging information on
#[arg(short, long, action = clap::ArgAction::Count)]
debug: u8,
#[command(subcommand)]
command: Option<Commands>,
}
#[derive(Subcommand)]
enum Commands {
/// does testing things
Test {
/// lists test values
#[arg(short, long)]
list: bool,
},
}
fn main() {
let cli = Cli::parse();
// You can check the value provided by positional arguments, or option arguments
if let Some(name) = cli.name.as_deref() {
println!("Value for name: {name}");
}
if let Some(config_path) = cli.config.as_deref() {
println!("Value for config: {}", config_path.display());
}
// You can see how many times a particular flag or argument occurred
// Note, only flags can have multiple occurrences
match cli.debug {
0 => println!("Debug mode is off"),
1 => println!("Debug mode is kind of on"),
2 => println!("Debug mode is on"),
_ => println!("Don't be crazy"),
}
// You can check for the existence of subcommands, and if found use their
// matches just as you would the top level cmd
match &cli.command {
Some(Commands::Test { list }) => {
if *list {
println!("Printing testing lists...");
} else {
println!("Not printing testing lists...");
}
}
None => {}
}
// Continued program logic goes here...
}