finalfrontier 0.9.4

Train/use word embeddings with subword units
Documentation 
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use std::io::stdout;

use anyhow::Result;
use clap::{App, AppSettings, Arg, Shell, SubCommand};

mod subcommands;
pub use subcommands::FinalfrontierApp;

static DEFAULT_CLAP_SETTINGS: &[AppSettings] = &[
    AppSettings::DontCollapseArgsInUsage,
    AppSettings::UnifiedHelpMessage,
    AppSettings::SubcommandRequiredElseHelp,
];

fn main() -> Result<()> {
    // Known subapplications.
    let apps = vec![subcommands::DepsApp::app(), subcommands::SkipgramApp::app()];

    let version = if let Some(git_desc) = option_env!("MAYBE_FINALFRONTIER_GIT_DESC") {
        git_desc
    } else {
        env!("CARGO_PKG_VERSION")
    };
    let cli = App::new("finalfrontier")
        .version(version)
        .settings(DEFAULT_CLAP_SETTINGS)
        .subcommands(apps)
        .subcommand(
            SubCommand::with_name("completions")
                .about("Generate completion scripts for your shell")
                .setting(AppSettings::ArgRequiredElseHelp)
                .arg(Arg::with_name("shell").possible_values(&Shell::variants())),
        );
    let matches = cli.clone().get_matches();
    match matches.subcommand_name().unwrap() {
        "completions" => {
            let shell = matches
                .subcommand_matches("completions")
                .unwrap()
                .value_of("shell")
                .unwrap();
            write_completion_script(cli, shell.parse::<Shell>().unwrap());
            Ok(())
        }
        "deps" => subcommands::DepsApp::parse(matches.subcommand_matches("deps").unwrap())?.run(),
        "skipgram" => {
            subcommands::SkipgramApp::parse(matches.subcommand_matches("skipgram").unwrap())?.run()
        }
        _unknown => unreachable!(),
    }
}

fn write_completion_script(mut cli: App, shell: Shell) {
    cli.gen_completions_to("finalfrontier", shell, &mut stdout());
}