clap-complete-command

Reduces boilerplate for adding a shell completion command to Clap

Examples

Derive

```rust use clap::{IntoApp, Parser, Subcommand};

[derive(Parser)]

struct Cli { #[clap(subcommand)] command: Commands, }

[derive(Subcommand)]

enum Commands { /// Generate shell completions Completions { /// The shell to generate the completions for #[clap(argenum)] shell: clapcomplete_command::Shell, }, }

fn main() { let cli = Cli::parse();

match cli.command {
    // e.g. `$ cli completions bash`
    Commands::Completions { shell } => {
        shell.generate(&mut Cli::command(), &mut std::io::stdout());
    }
}

} ```

Builder

```rust use clap::{Arg, Command};

fn buildcli() -> Command<'static> { Command::new(env!("CARGOPKGNAME")) .subcommandrequired(true) .subcommand( Command::new("completions") .about("Generate shell completions") .arg( Arg::new("shell") .valuename("SHELL") .help("The shell to generate the completions for") .required(true) .possiblevalues(clapcompletecommand::Shell::possible_values()), ), ) }

fn main() { let matches = buildcli().getmatches();

match matches.subcommand() {
    Some(("completions", sub_matches)) => {
        // e.g. `$ cli completions bash`
        if let Ok(shell) = sub_matches.value_of_t::<clap_complete_command::Shell>("shell") {
            let mut command = build_cli();
            shell.generate(&mut command, &mut std::io::stdout());
        }
    }
    _ => {
        unreachable!("Exhausted list of subcommands and `subcommand_required` prevents `None`")
    }
}

} ```

Supported shells

The supported shells can be seen in clap_complete_command::Shell.