grnenv-rs 0.2.0

grnenv is a tool to switch using multiple Groonga versions.
Documentation 
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extern crate tempdir;
extern crate hyper;
extern crate grnenvlib;
#[macro_use]
extern crate clap;

use clap::{Arg, App, AppSettings, SubCommand};
use grnenvlib::command;

fn main() {
    default_main();
}

fn cli() -> App<'static, 'static> {
    App::new("grnenv-rs")
        .version(crate_version!())
        .author(crate_authors!())
        .about("A tiny tool for switch multiple Groonga versions.")
        .setting(AppSettings::AllowExternalSubcommands)
        .subcommand(SubCommand::with_name("init").about("Prepare grnenv-rs."))
        .subcommand(SubCommand::with_name("install")
            .about("Install a given Groonga version and arch")
            .arg(Arg::with_name("VERSION").required(true))
            .arg(Arg::with_name("arch")
                .short("a")
                .long("arch")
                .value_name("ARCH")
                .help("Select architectures. e.g.) x86, x64")
                .takes_value(true)))
        .subcommand(SubCommand::with_name("switch")
            .about("Switch Groonga with given version and arch")
            .arg(Arg::with_name("VERSION").required(true))
            .arg(Arg::with_name("arch")
                .short("a")
                .long("arch")
                .value_name("ARCH")
                .help("Select architectures. e.g.) x86, x64")
                .takes_value(true)))
        .subcommand(SubCommand::with_name("versions").about("Display installed Groonga versions"))
        .subcommand(SubCommand::with_name("uninstall")
            .about("Uninstall a given Groonga version and arch")
            .arg(Arg::with_name("VERSION").required(true))
            .arg(Arg::with_name("arch")
                .short("a")
                .long("arch")
                .value_name("ARCH")
                .help("Select architectures. e.g.) x86, x64")
                .takes_value(true)))
        .subcommand(SubCommand::with_name("list").about("Display installable Groonga versions"))
}

#[cfg(not(windows))]
fn default_main() {
    let mut app = cli();
    let matches = app.clone().get_matches();
    match matches.subcommand() {
        ("init", _) => command::unix::init(),
        ("install", Some(m)) => command::unix::install(m),
        ("switch", Some(m)) => command::unix::switch(m),
        ("versions", _) => command::common::versions(),
        ("uninstall", Some(m)) => command::unix::uninstall(m),
        ("list", _) => command::unix::list(),
        (external, Some(ext_m)) => command::common::execute_external_command(external, ext_m),
        (_, _) => {
            let _ = app.print_help();
        }
    }
}

#[cfg(windows)]
fn default_main() {
    let mut app = cli();
    let matches = app.clone().get_matches();
    match matches.subcommand() {
        ("init", _) => command::windows::init(),
        ("install", Some(m)) => command::windows::install(m),
        ("switch", Some(m)) => command::windows::switch(m),
        ("versions", _) => command::common::versions(),
        ("uninstall", Some(m)) => command::windows::uninstall(m),
        ("list", _) => command::windows::list(),
        (external, Some(ext_m)) => command::common::execute_external_command(external, ext_m),
        (_, _) => {
            let _ = app.print_help();
        }
    }
}