google-apis-rs/gen/libraryagent1-cli/src/main.rs

// DO NOT EDIT !
// This file was generated automatically from 'src/generator/templates/cli/main.rs.mako'
// DO NOT EDIT !
#![allow(unused_variables, unused_imports, dead_code, unused_mut)]

#[macro_use]
extern crate clap;

use std::env;
use std::io::{self, Write};
use clap::{App, SubCommand, Arg};

use google_libraryagent1::{api, Error, oauth2, client::chrono, FieldMask};


use google_clis_common as client;

use client::{InvalidOptionsError, CLIError, arg_from_str, writer_from_opts, parse_kv_arg,
          input_file_from_opts, input_mime_from_opts, FieldCursor, FieldError, CallType, UploadProtocol,
          calltype_from_str, remove_json_null_values, ComplexType, JsonType, JsonTypeInfo};

use std::default::Default;
use std::error::Error as StdError;
use std::str::FromStr;

use serde_json as json;
use clap::ArgMatches;
use http::Uri;
use hyper::client::connect;
use tokio::io::{AsyncRead, AsyncWrite};
use tower_service;

enum DoitError {
    IoError(String, io::Error),
    ApiError(Error),
}

struct Engine<'n, S> {
    opt: ArgMatches<'n>,
    hub: api::Libraryagent<S>,
    gp: Vec<&'static str>,
    gpm: Vec<(&'static str, &'static str)>,
}


impl<'n, S> Engine<'n, S>
where
    S: tower_service::Service<Uri> + Clone + Send + Sync + 'static,
    S::Response: hyper::client::connect::Connection + AsyncRead + AsyncWrite + Send + Unpin + 'static,
    S::Future: Send + Unpin + 'static,
    S::Error: Into<Box<dyn StdError + Send + Sync>>,
{
    async fn _shelves_books_borrow(&self, opt: &ArgMatches<'n>, dry_run: bool, err: &mut InvalidOptionsError)
                                                    -> Result<(), DoitError> {
        let mut call = self.hub.shelves().books_borrow(opt.value_of("name").unwrap_or(""));
        for parg in opt.values_of("v").map(|i|i.collect()).unwrap_or(Vec::new()).iter() {
            let (key, value) = parse_kv_arg(&*parg, err, false);
            match key {
                _ => {
                    let mut found = false;
                    for param in &self.gp {
                        if key == *param {
                            found = true;
                            call = call.param(self.gpm.iter().find(|t| t.0 == key).unwrap_or(&("", key)).1, value.unwrap_or("unset"));
                            break;
                        }
                    }
                    if !found {
                        err.issues.push(CLIError::UnknownParameter(key.to_string(),
                                                                  {let mut v = Vec::new();
                                                                           v.extend(self.gp.iter().map(|v|*v));
                                                                           v } ));
                    }
                }
            }
        }
        let protocol = CallType::Standard;
        if dry_run {
            Ok(())
        } else {
            assert!(err.issues.len() == 0);
            for scope in self.opt.values_of("url").map(|i|i.collect()).unwrap_or(Vec::new()).iter() {
                call = call.add_scope(scope);
            }
            let mut ostream = match writer_from_opts(opt.value_of("out")) {
                Ok(mut f) => f,
                Err(io_err) => return Err(DoitError::IoError(opt.value_of("out").unwrap_or("-").to_string(), io_err)),
            };
            match match protocol {
                CallType::Standard => call.doit().await,
                _ => unreachable!()
            } {
                Err(api_err) => Err(DoitError::ApiError(api_err)),
                Ok((mut response, output_schema)) => {
                    let mut value = json::value::to_value(&output_schema).expect("serde to work");
                    remove_json_null_values(&mut value);
                    json::to_writer_pretty(&mut ostream, &value).unwrap();
                    ostream.flush().unwrap();
                    Ok(())
                }
            }
        }
    }

    async fn _shelves_books_get(&self, opt: &ArgMatches<'n>, dry_run: bool, err: &mut InvalidOptionsError)
                                                    -> Result<(), DoitError> {
        let mut call = self.hub.shelves().books_get(opt.value_of("name").unwrap_or(""));
        for parg in opt.values_of("v").map(|i|i.collect()).unwrap_or(Vec::new()).iter() {
            let (key, value) = parse_kv_arg(&*parg, err, false);
            match key {
                _ => {
                    let mut found = false;
                    for param in &self.gp {
                        if key == *param {
                            found = true;
                            call = call.param(self.gpm.iter().find(|t| t.0 == key).unwrap_or(&("", key)).1, value.unwrap_or("unset"));
                            break;
                        }
                    }
                    if !found {
                        err.issues.push(CLIError::UnknownParameter(key.to_string(),
                                                                  {let mut v = Vec::new();
                                                                           v.extend(self.gp.iter().map(|v|*v));
                                                                           v } ));
                    }
                }
            }
        }
        let protocol = CallType::Standard;
        if dry_run {
            Ok(())
        } else {
            assert!(err.issues.len() == 0);
            for scope in self.opt.values_of("url").map(|i|i.collect()).unwrap_or(Vec::new()).iter() {
                call = call.add_scope(scope);
            }
            let mut ostream = match writer_from_opts(opt.value_of("out")) {
                Ok(mut f) => f,
                Err(io_err) => return Err(DoitError::IoError(opt.value_of("out").unwrap_or("-").to_string(), io_err)),
            };
            match match protocol {
                CallType::Standard => call.doit().await,
                _ => unreachable!()
            } {
                Err(api_err) => Err(DoitError::ApiError(api_err)),
                Ok((mut response, output_schema)) => {
                    let mut value = json::value::to_value(&output_schema).expect("serde to work");
                    remove_json_null_values(&mut value);
                    json::to_writer_pretty(&mut ostream, &value).unwrap();
                    ostream.flush().unwrap();
                    Ok(())
                }
            }
        }
    }

    async fn _shelves_books_list(&self, opt: &ArgMatches<'n>, dry_run: bool, err: &mut InvalidOptionsError)
                                                    -> Result<(), DoitError> {
        let mut call = self.hub.shelves().books_list(opt.value_of("parent").unwrap_or(""));
        for parg in opt.values_of("v").map(|i|i.collect()).unwrap_or(Vec::new()).iter() {
            let (key, value) = parse_kv_arg(&*parg, err, false);
            match key {
                "page-token" => {
                    call = call.page_token(value.unwrap_or(""));
                },
                "page-size" => {
                    call = call.page_size(        value.map(|v| arg_from_str(v, err, "page-size", "int32")).unwrap_or(-0));
                },
                _ => {
                    let mut found = false;
                    for param in &self.gp {
                        if key == *param {
                            found = true;
                            call = call.param(self.gpm.iter().find(|t| t.0 == key).unwrap_or(&("", key)).1, value.unwrap_or("unset"));
                            break;
                        }
                    }
                    if !found {
                        err.issues.push(CLIError::UnknownParameter(key.to_string(),
                                                                  {let mut v = Vec::new();
                                                                           v.extend(self.gp.iter().map(|v|*v));
                                                                           v.extend(["page-size", "page-token"].iter().map(|v|*v));
                                                                           v } ));
                    }
                }
            }
        }
        let protocol = CallType::Standard;
        if dry_run {
            Ok(())
        } else {
            assert!(err.issues.len() == 0);
            for scope in self.opt.values_of("url").map(|i|i.collect()).unwrap_or(Vec::new()).iter() {
                call = call.add_scope(scope);
            }
            let mut ostream = match writer_from_opts(opt.value_of("out")) {
                Ok(mut f) => f,
                Err(io_err) => return Err(DoitError::IoError(opt.value_of("out").unwrap_or("-").to_string(), io_err)),
            };
            match match protocol {
                CallType::Standard => call.doit().await,
                _ => unreachable!()
            } {
                Err(api_err) => Err(DoitError::ApiError(api_err)),
                Ok((mut response, output_schema)) => {
                    let mut value = json::value::to_value(&output_schema).expect("serde to work");
                    remove_json_null_values(&mut value);
                    json::to_writer_pretty(&mut ostream, &value).unwrap();
                    ostream.flush().unwrap();
                    Ok(())
                }
            }
        }
    }

    async fn _shelves_books_return(&self, opt: &ArgMatches<'n>, dry_run: bool, err: &mut InvalidOptionsError)
                                                    -> Result<(), DoitError> {
        let mut call = self.hub.shelves().books_return(opt.value_of("name").unwrap_or(""));
        for parg in opt.values_of("v").map(|i|i.collect()).unwrap_or(Vec::new()).iter() {
            let (key, value) = parse_kv_arg(&*parg, err, false);
            match key {
                _ => {
                    let mut found = false;
                    for param in &self.gp {
                        if key == *param {
                            found = true;
                            call = call.param(self.gpm.iter().find(|t| t.0 == key).unwrap_or(&("", key)).1, value.unwrap_or("unset"));
                            break;
                        }
                    }
                    if !found {
                        err.issues.push(CLIError::UnknownParameter(key.to_string(),
                                                                  {let mut v = Vec::new();
                                                                           v.extend(self.gp.iter().map(|v|*v));
                                                                           v } ));
                    }
                }
            }
        }
        let protocol = CallType::Standard;
        if dry_run {
            Ok(())
        } else {
            assert!(err.issues.len() == 0);
            for scope in self.opt.values_of("url").map(|i|i.collect()).unwrap_or(Vec::new()).iter() {
                call = call.add_scope(scope);
            }
            let mut ostream = match writer_from_opts(opt.value_of("out")) {
                Ok(mut f) => f,
                Err(io_err) => return Err(DoitError::IoError(opt.value_of("out").unwrap_or("-").to_string(), io_err)),
            };
            match match protocol {
                CallType::Standard => call.doit().await,
                _ => unreachable!()
            } {
                Err(api_err) => Err(DoitError::ApiError(api_err)),
                Ok((mut response, output_schema)) => {
                    let mut value = json::value::to_value(&output_schema).expect("serde to work");
                    remove_json_null_values(&mut value);
                    json::to_writer_pretty(&mut ostream, &value).unwrap();
                    ostream.flush().unwrap();
                    Ok(())
                }
            }
        }
    }

    async fn _shelves_get(&self, opt: &ArgMatches<'n>, dry_run: bool, err: &mut InvalidOptionsError)
                                                    -> Result<(), DoitError> {
        let mut call = self.hub.shelves().get(opt.value_of("name").unwrap_or(""));
        for parg in opt.values_of("v").map(|i|i.collect()).unwrap_or(Vec::new()).iter() {
            let (key, value) = parse_kv_arg(&*parg, err, false);
            match key {
                _ => {
                    let mut found = false;
                    for param in &self.gp {
                        if key == *param {
                            found = true;
                            call = call.param(self.gpm.iter().find(|t| t.0 == key).unwrap_or(&("", key)).1, value.unwrap_or("unset"));
                            break;
                        }
                    }
                    if !found {
                        err.issues.push(CLIError::UnknownParameter(key.to_string(),
                                                                  {let mut v = Vec::new();
                                                                           v.extend(self.gp.iter().map(|v|*v));
                                                                           v } ));
                    }
                }
            }
        }
        let protocol = CallType::Standard;
        if dry_run {
            Ok(())
        } else {
            assert!(err.issues.len() == 0);
            for scope in self.opt.values_of("url").map(|i|i.collect()).unwrap_or(Vec::new()).iter() {
                call = call.add_scope(scope);
            }
            let mut ostream = match writer_from_opts(opt.value_of("out")) {
                Ok(mut f) => f,
                Err(io_err) => return Err(DoitError::IoError(opt.value_of("out").unwrap_or("-").to_string(), io_err)),
            };
            match match protocol {
                CallType::Standard => call.doit().await,
                _ => unreachable!()
            } {
                Err(api_err) => Err(DoitError::ApiError(api_err)),
                Ok((mut response, output_schema)) => {
                    let mut value = json::value::to_value(&output_schema).expect("serde to work");
                    remove_json_null_values(&mut value);
                    json::to_writer_pretty(&mut ostream, &value).unwrap();
                    ostream.flush().unwrap();
                    Ok(())
                }
            }
        }
    }

    async fn _shelves_list(&self, opt: &ArgMatches<'n>, dry_run: bool, err: &mut InvalidOptionsError)
                                                    -> Result<(), DoitError> {
        let mut call = self.hub.shelves().list();
        for parg in opt.values_of("v").map(|i|i.collect()).unwrap_or(Vec::new()).iter() {
            let (key, value) = parse_kv_arg(&*parg, err, false);
            match key {
                "page-token" => {
                    call = call.page_token(value.unwrap_or(""));
                },
                "page-size" => {
                    call = call.page_size(        value.map(|v| arg_from_str(v, err, "page-size", "int32")).unwrap_or(-0));
                },
                _ => {
                    let mut found = false;
                    for param in &self.gp {
                        if key == *param {
                            found = true;
                            call = call.param(self.gpm.iter().find(|t| t.0 == key).unwrap_or(&("", key)).1, value.unwrap_or("unset"));
                            break;
                        }
                    }
                    if !found {
                        err.issues.push(CLIError::UnknownParameter(key.to_string(),
                                                                  {let mut v = Vec::new();
                                                                           v.extend(self.gp.iter().map(|v|*v));
                                                                           v.extend(["page-size", "page-token"].iter().map(|v|*v));
                                                                           v } ));
                    }
                }
            }
        }
        let protocol = CallType::Standard;
        if dry_run {
            Ok(())
        } else {
            assert!(err.issues.len() == 0);
            for scope in self.opt.values_of("url").map(|i|i.collect()).unwrap_or(Vec::new()).iter() {
                call = call.add_scope(scope);
            }
            let mut ostream = match writer_from_opts(opt.value_of("out")) {
                Ok(mut f) => f,
                Err(io_err) => return Err(DoitError::IoError(opt.value_of("out").unwrap_or("-").to_string(), io_err)),
            };
            match match protocol {
                CallType::Standard => call.doit().await,
                _ => unreachable!()
            } {
                Err(api_err) => Err(DoitError::ApiError(api_err)),
                Ok((mut response, output_schema)) => {
                    let mut value = json::value::to_value(&output_schema).expect("serde to work");
                    remove_json_null_values(&mut value);
                    json::to_writer_pretty(&mut ostream, &value).unwrap();
                    ostream.flush().unwrap();
                    Ok(())
                }
            }
        }
    }

    async fn _doit(&self, dry_run: bool) -> Result<Result<(), DoitError>, Option<InvalidOptionsError>> {
        let mut err = InvalidOptionsError::new();
        let mut call_result: Result<(), DoitError> = Ok(());
        let mut err_opt: Option<InvalidOptionsError> = None;
        match self.opt.subcommand() {
            ("shelves", Some(opt)) => {
                match opt.subcommand() {
                    ("books-borrow", Some(opt)) => {
                        call_result = self._shelves_books_borrow(opt, dry_run, &mut err).await;
                    },
                    ("books-get", Some(opt)) => {
                        call_result = self._shelves_books_get(opt, dry_run, &mut err).await;
                    },
                    ("books-list", Some(opt)) => {
                        call_result = self._shelves_books_list(opt, dry_run, &mut err).await;
                    },
                    ("books-return", Some(opt)) => {
                        call_result = self._shelves_books_return(opt, dry_run, &mut err).await;
                    },
                    ("get", Some(opt)) => {
                        call_result = self._shelves_get(opt, dry_run, &mut err).await;
                    },
                    ("list", Some(opt)) => {
                        call_result = self._shelves_list(opt, dry_run, &mut err).await;
                    },
                    _ => {
                        err.issues.push(CLIError::MissingMethodError("shelves".to_string()));
                        writeln!(io::stderr(), "{}\n", opt.usage()).ok();
                    }
                }
            },
            _ => {
                err.issues.push(CLIError::MissingCommandError);
                writeln!(io::stderr(), "{}\n", self.opt.usage()).ok();
            }
        }

        if dry_run {
            if err.issues.len() > 0 {
                err_opt = Some(err);
            }
            Err(err_opt)
        } else {
            Ok(call_result)
        }
    }

    // Please note that this call will fail if any part of the opt can't be handled
    async fn new(opt: ArgMatches<'n>, connector: S) -> Result<Engine<'n, S>, InvalidOptionsError> {
        let (config_dir, secret) = {
            let config_dir = match client::assure_config_dir_exists(opt.value_of("folder").unwrap_or("~/.google-service-cli")) {
                Err(e) => return Err(InvalidOptionsError::single(e, 3)),
                Ok(p) => p,
            };

            match client::application_secret_from_directory(&config_dir, "libraryagent1-secret.json",
                                                         "{\"installed\":{\"auth_uri\":\"https://accounts.google.com/o/oauth2/auth\",\"client_secret\":\"hCsslbCUyfehWMmbkG8vTYxG\",\"token_uri\":\"https://accounts.google.com/o/oauth2/token\",\"client_email\":\"\",\"redirect_uris\":[\"urn:ietf:wg:oauth:2.0:oob\",\"oob\"],\"client_x509_cert_url\":\"\",\"client_id\":\"620010449518-9ngf7o4dhs0dka470npqvor6dc5lqb9b.apps.googleusercontent.com\",\"auth_provider_x509_cert_url\":\"https://www.googleapis.com/oauth2/v1/certs\"}}") {
                Ok(secret) => (config_dir, secret),
                Err(e) => return Err(InvalidOptionsError::single(e, 4))
            }
        };

        let client = hyper::Client::builder().build(connector);

        let auth = oauth2::InstalledFlowAuthenticator::with_client(
            secret,
            oauth2::InstalledFlowReturnMethod::HTTPRedirect,
            client.clone(),
        ).persist_tokens_to_disk(format!("{}/libraryagent1", config_dir)).build().await.unwrap();

        let engine = Engine {
            opt: opt,
            hub: api::Libraryagent::new(client, auth),
            gp: vec!["$-xgafv", "access-token", "alt", "callback", "fields", "key", "oauth-token", "pretty-print", "quota-user", "upload-type", "upload-protocol"],
            gpm: vec![
                    ("$-xgafv", "$.xgafv"),
                    ("access-token", "access_token"),
                    ("oauth-token", "oauth_token"),
                    ("pretty-print", "prettyPrint"),
                    ("quota-user", "quotaUser"),
                    ("upload-type", "uploadType"),
                    ("upload-protocol", "upload_protocol"),
                ]
        };

        match engine._doit(true).await {
            Err(Some(err)) => Err(err),
            Err(None)      => Ok(engine),
            Ok(_)          => unreachable!(),
        }
    }

    async fn doit(&self) -> Result<(), DoitError> {
        match self._doit(false).await {
            Ok(res) => res,
            Err(_) => unreachable!(),
        }
    }
}

#[tokio::main]
async fn main() {
    let mut exit_status = 0i32;
    let arg_data = [
        ("shelves", "methods: 'books-borrow', 'books-get', 'books-list', 'books-return', 'get' and 'list'", vec![
            ("books-borrow",
                    Some(r##"Borrow a book from the library. Returns the book if it is borrowed successfully. Returns NOT_FOUND if the book does not exist in the library. Returns quota exceeded error if the amount of books borrowed exceeds allocation quota in any dimensions."##),
                    "Details at http://byron.github.io/google-apis-rs/google_libraryagent1_cli/shelves_books-borrow",
                  vec![
                    (Some(r##"name"##),
                     None,
                     Some(r##"Required. The name of the book to borrow."##),
                     Some(true),
                     Some(false)),
        
                    (Some(r##"v"##),
                     Some(r##"p"##),
                     Some(r##"Set various optional parameters, matching the key=value form"##),
                     Some(false),
                     Some(true)),
        
                    (Some(r##"out"##),
                     Some(r##"o"##),
                     Some(r##"Specify the file into which to write the program's output"##),
                     Some(false),
                     Some(false)),
                  ]),
            ("books-get",
                    Some(r##"Gets a book. Returns NOT_FOUND if the book does not exist."##),
                    "Details at http://byron.github.io/google-apis-rs/google_libraryagent1_cli/shelves_books-get",
                  vec![
                    (Some(r##"name"##),
                     None,
                     Some(r##"Required. The name of the book to retrieve."##),
                     Some(true),
                     Some(false)),
        
                    (Some(r##"v"##),
                     Some(r##"p"##),
                     Some(r##"Set various optional parameters, matching the key=value form"##),
                     Some(false),
                     Some(true)),
        
                    (Some(r##"out"##),
                     Some(r##"o"##),
                     Some(r##"Specify the file into which to write the program's output"##),
                     Some(false),
                     Some(false)),
                  ]),
            ("books-list",
                    Some(r##"Lists books in a shelf. The order is unspecified but deterministic. Newly created books will not necessarily be added to the end of this list. Returns NOT_FOUND if the shelf does not exist."##),
                    "Details at http://byron.github.io/google-apis-rs/google_libraryagent1_cli/shelves_books-list",
                  vec![
                    (Some(r##"parent"##),
                     None,
                     Some(r##"Required. The name of the shelf whose books we'd like to list."##),
                     Some(true),
                     Some(false)),
        
                    (Some(r##"v"##),
                     Some(r##"p"##),
                     Some(r##"Set various optional parameters, matching the key=value form"##),
                     Some(false),
                     Some(true)),
        
                    (Some(r##"out"##),
                     Some(r##"o"##),
                     Some(r##"Specify the file into which to write the program's output"##),
                     Some(false),
                     Some(false)),
                  ]),
            ("books-return",
                    Some(r##"Return a book to the library. Returns the book if it is returned to the library successfully. Returns error if the book does not belong to the library or the users didn't borrow before."##),
                    "Details at http://byron.github.io/google-apis-rs/google_libraryagent1_cli/shelves_books-return",
                  vec![
                    (Some(r##"name"##),
                     None,
                     Some(r##"Required. The name of the book to return."##),
                     Some(true),
                     Some(false)),
        
                    (Some(r##"v"##),
                     Some(r##"p"##),
                     Some(r##"Set various optional parameters, matching the key=value form"##),
                     Some(false),
                     Some(true)),
        
                    (Some(r##"out"##),
                     Some(r##"o"##),
                     Some(r##"Specify the file into which to write the program's output"##),
                     Some(false),
                     Some(false)),
                  ]),
            ("get",
                    Some(r##"Gets a shelf. Returns NOT_FOUND if the shelf does not exist."##),
                    "Details at http://byron.github.io/google-apis-rs/google_libraryagent1_cli/shelves_get",
                  vec![
                    (Some(r##"name"##),
                     None,
                     Some(r##"Required. The name of the shelf to retrieve."##),
                     Some(true),
                     Some(false)),
        
                    (Some(r##"v"##),
                     Some(r##"p"##),
                     Some(r##"Set various optional parameters, matching the key=value form"##),
                     Some(false),
                     Some(true)),
        
                    (Some(r##"out"##),
                     Some(r##"o"##),
                     Some(r##"Specify the file into which to write the program's output"##),
                     Some(false),
                     Some(false)),
                  ]),
            ("list",
                    Some(r##"Lists shelves. The order is unspecified but deterministic. Newly created shelves will not necessarily be added to the end of this list."##),
                    "Details at http://byron.github.io/google-apis-rs/google_libraryagent1_cli/shelves_list",
                  vec![
                    (Some(r##"v"##),
                     Some(r##"p"##),
                     Some(r##"Set various optional parameters, matching the key=value form"##),
                     Some(false),
                     Some(true)),
        
                    (Some(r##"out"##),
                     Some(r##"o"##),
                     Some(r##"Specify the file into which to write the program's output"##),
                     Some(false),
                     Some(false)),
                  ]),
            ]),
        
    ];
    
    let mut app = App::new("libraryagent1")
           .author("Sebastian Thiel <byronimo@gmail.com>")
           .version("5.0.4+20240303")
           .about("A simple Google Example Library API.")
           .after_help("All documentation details can be found at http://byron.github.io/google-apis-rs/google_libraryagent1_cli")
           .arg(Arg::with_name("url")
                   .long("scope")
                   .help("Specify the authentication a method should be executed in. Each scope requires the user to grant this application permission to use it.If unset, it defaults to the shortest scope url for a particular method.")
                   .multiple(true)
                   .takes_value(true))
           .arg(Arg::with_name("folder")
                   .long("config-dir")
                   .help("A directory into which we will store our persistent data. Defaults to a user-writable directory that we will create during the first invocation.[default: ~/.google-service-cli")
                   .multiple(false)
                   .takes_value(true))
           .arg(Arg::with_name("debug")
                   .long("debug")
                   .help("Debug print all errors")
                   .multiple(false)
                   .takes_value(false));
           
           for &(main_command_name, about, ref subcommands) in arg_data.iter() {
               let mut mcmd = SubCommand::with_name(main_command_name).about(about);
           
               for &(sub_command_name, ref desc, url_info, ref args) in subcommands {
                   let mut scmd = SubCommand::with_name(sub_command_name);
                   if let &Some(desc) = desc {
                       scmd = scmd.about(desc);
                   }
                   scmd = scmd.after_help(url_info);
           
                   for &(ref arg_name, ref flag, ref desc, ref required, ref multi) in args {
                       let arg_name_str =
                           match (arg_name, flag) {
                                   (&Some(an), _       ) => an,
                                   (_        , &Some(f)) => f,
                                    _                    => unreachable!(),
                            };
                       let mut arg = Arg::with_name(arg_name_str)
                                         .empty_values(false);
                       if let &Some(short_flag) = flag {
                           arg = arg.short(short_flag);
                       }
                       if let &Some(desc) = desc {
                           arg = arg.help(desc);
                       }
                       if arg_name.is_some() && flag.is_some() {
                           arg = arg.takes_value(true);
                       }
                       if let &Some(required) = required {
                           arg = arg.required(required);
                       }
                       if let &Some(multi) = multi {
                           arg = arg.multiple(multi);
                       }
                       scmd = scmd.arg(arg);
                   }
                   mcmd = mcmd.subcommand(scmd);
               }
               app = app.subcommand(mcmd);
           }
           
        let matches = app.get_matches();

    let debug = matches.is_present("adebug");
    let connector = hyper_rustls::HttpsConnectorBuilder::new().with_native_roots()
        .https_or_http()
        .enable_http1()
        .build();

    match Engine::new(matches, connector).await {
        Err(err) => {
            exit_status = err.exit_code;
            writeln!(io::stderr(), "{}", err).ok();
        },
        Ok(engine) => {
            if let Err(doit_err) = engine.doit().await {
                exit_status = 1;
                match doit_err {
                    DoitError::IoError(path, err) => {
                        writeln!(io::stderr(), "Failed to open output file '{}': {}", path, err).ok();
                    },
                    DoitError::ApiError(err) => {
                        if debug {
                            writeln!(io::stderr(), "{:#?}", err).ok();
                        } else {
                            writeln!(io::stderr(), "{}", err).ok();
                        }
                    }
                }
            }
        }
    }

    std::process::exit(exit_status);
}