// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use crate::fs::resolve_from_cwd;
use clap::App;
use clap::AppSettings;
use clap::Arg;
use clap::ArgMatches;
use clap::SubCommand;
use log::Level;
use std::collections::HashSet;
use std::net::SocketAddr;
use std::path::{Path, PathBuf};

/// Creates vector of strings, Vec<String>
macro_rules! svec {
    ($($x:expr),*) => (vec![$($x.to_string()),*]);
}
/// Creates HashSet<String> from string literals
macro_rules! sset {
  ($($x:expr),*) => {{
    let _v = svec![$($x.to_string()),*];
    let hash_set: HashSet<String> = _v.iter().cloned().collect();
    hash_set
  }}
}

#[derive(Clone, Debug, PartialEq)]
pub enum DenoSubcommand {
  Bundle {
    source_file: String,
    out_file: Option<PathBuf>,
  },
  Completions {
    buf: Box<[u8]>,
  },
  Doc {
    json: bool,
    source_file: String,
    filter: Option<String>,
  },
  Eval {
    code: String,
    as_typescript: bool,
  },
  Fetch {
    files: Vec<String>,
  },
  Fmt {
    check: bool,
    files: Vec<String>,
  },
  Help,
  Info {
    file: Option<String>,
  },
  Install {
    dir: Option<PathBuf>,
    exe_name: String,
    module_url: String,
    args: Vec<String>,
    force: bool,
  },
  Repl,
  Run {
    script: String,
  },
  Test {
    fail_fast: bool,
    allow_none: bool,
    include: Option<Vec<String>>,
    filter: Option<String>,
  },
  Types,
  Upgrade {
    dry_run: bool,
    force: bool,
  },
}

impl Default for DenoSubcommand {
  fn default() -> DenoSubcommand {
    DenoSubcommand::Repl
  }
}

#[derive(Clone, Debug, PartialEq, Default)]
pub struct Flags {
  /// Vector of CLI arguments - these are user script arguments, all Deno
  /// specific flags are removed.
  pub argv: Vec<String>,
  pub subcommand: DenoSubcommand,

  pub log_level: Option<Level>,
  pub version: bool,
  pub reload: bool,
  pub config_path: Option<String>,
  pub import_map_path: Option<String>,
  pub allow_read: bool,
  pub read_whitelist: Vec<PathBuf>,
  pub cache_blacklist: Vec<String>,
  pub allow_write: bool,
  pub write_whitelist: Vec<PathBuf>,
  pub allow_net: bool,
  pub net_whitelist: Vec<String>,
  pub allow_env: bool,
  pub allow_run: bool,
  pub allow_plugin: bool,
  pub allow_hrtime: bool,
  pub no_prompts: bool,
  pub no_remote: bool,
  pub cached_only: bool,
  pub inspect: Option<SocketAddr>,
  pub inspect_brk: Option<SocketAddr>,
  pub seed: Option<u64>,
  pub v8_flags: Option<Vec<String>>,

  pub lock: Option<String>,
  pub lock_write: bool,
  pub ca_file: Option<String>,
}

fn join_paths(whitelist: &[PathBuf], d: &str) -> String {
  whitelist
    .iter()
    .map(|path| path.to_str().unwrap().to_string())
    .collect::<Vec<String>>()
    .join(d)
}

impl Flags {
  /// Return list of permission arguments that are equivalent
  /// to the ones used to create `self`.
  pub fn to_permission_args(&self) -> Vec<String> {
    let mut args = vec![];

    if !self.read_whitelist.is_empty() {
      let s = format!("--allow-read={}", join_paths(&self.read_whitelist, ","));
      args.push(s);
    }

    if self.allow_read {
      args.push("--allow-read".to_string());
    }

    if !self.write_whitelist.is_empty() {
      let s =
        format!("--allow-write={}", join_paths(&self.write_whitelist, ","));
      args.push(s);
    }

    if self.allow_write {
      args.push("--allow-write".to_string());
    }

    if !self.net_whitelist.is_empty() {
      let s = format!("--allow-net={}", self.net_whitelist.join(","));
      args.push(s);
    }

    if self.allow_net {
      args.push("--allow-net".to_string());
    }

    if self.allow_env {
      args.push("--allow-env".to_string());
    }

    if self.allow_run {
      args.push("--allow-run".to_string());
    }

    if self.allow_plugin {
      args.push("--allow-plugin".to_string());
    }

    if self.allow_hrtime {
      args.push("--allow-hrtime".to_string());
    }

    args
  }
}

static ENV_VARIABLES_HELP: &str = "ENVIRONMENT VARIABLES:
    DENO_DIR       Set deno's base directory
    NO_COLOR       Set to disable color
    HTTP_PROXY     Proxy address for HTTP requests (module downloads, fetch)
    HTTPS_PROXY    Same but for HTTPS";

static DENO_HELP: &str = "A secure JavaScript and TypeScript runtime

Docs: https://deno.land/std/manual.md
Modules: https://deno.land/std/ https://deno.land/x/
Bugs: https://github.com/denoland/deno/issues

To start the REPL, supply no arguments:
  deno

To execute a script:
  deno run https://deno.land/std/examples/welcome.ts
  deno https://deno.land/std/examples/welcome.ts

To evaluate code in the shell:
  deno eval \"console.log(30933 + 404)\"

Run 'deno help run' for 'run'-specific flags.";

lazy_static! {
  static ref LONG_VERSION: String = format!(
    "{}\nv8 {}\ntypescript {}",
    crate::version::DENO,
    crate::version::v8(),
    crate::version::TYPESCRIPT
  );
}

/// Main entry point for parsing deno's command line flags.
/// Exits the process on error.
pub fn flags_from_vec(args: Vec<String>) -> Flags {
  match flags_from_vec_safe(args) {
    Ok(flags) => flags,
    Err(err) => err.exit(),
  }
}

/// Same as flags_from_vec but does not exit on error.
pub fn flags_from_vec_safe(args: Vec<String>) -> clap::Result<Flags> {
  let args = arg_hacks(args);
  let app = clap_root();
  let matches = app.get_matches_from_safe(args)?;

  let mut flags = Flags::default();

  if matches.is_present("log-level") {
    flags.log_level = match matches.value_of("log-level").unwrap() {
      "debug" => Some(Level::Debug),
      "info" => Some(Level::Info),
      _ => unreachable!(),
    };
  }
  if matches.is_present("quiet") {
    flags.log_level = Some(Level::Error);
  }

  if let Some(m) = matches.subcommand_matches("run") {
    run_parse(&mut flags, m);
  } else if let Some(m) = matches.subcommand_matches("fmt") {
    fmt_parse(&mut flags, m);
  } else if let Some(m) = matches.subcommand_matches("types") {
    types_parse(&mut flags, m);
  } else if let Some(m) = matches.subcommand_matches("fetch") {
    fetch_parse(&mut flags, m);
  } else if let Some(m) = matches.subcommand_matches("info") {
    info_parse(&mut flags, m);
  } else if let Some(m) = matches.subcommand_matches("eval") {
    eval_parse(&mut flags, m);
  } else if let Some(m) = matches.subcommand_matches("repl") {
    repl_parse(&mut flags, m);
  } else if let Some(m) = matches.subcommand_matches("bundle") {
    bundle_parse(&mut flags, m);
  } else if let Some(m) = matches.subcommand_matches("install") {
    install_parse(&mut flags, m);
  } else if let Some(m) = matches.subcommand_matches("completions") {
    completions_parse(&mut flags, m);
  } else if let Some(m) = matches.subcommand_matches("test") {
    test_parse(&mut flags, m);
  } else if let Some(m) = matches.subcommand_matches("upgrade") {
    upgrade_parse(&mut flags, m);
  } else if let Some(m) = matches.subcommand_matches("doc") {
    doc_parse(&mut flags, m);
  } else {
    unimplemented!();
  }

  Ok(flags)
}

fn clap_root<'a, 'b>() -> App<'a, 'b> {
  clap::App::new("deno")
    .bin_name("deno")
    .global_settings(&[
      AppSettings::UnifiedHelpMessage,
      AppSettings::ColorNever,
      AppSettings::VersionlessSubcommands,
    ])
    // Disable clap's auto-detection of terminal width
    .set_term_width(0)
    // Disable each subcommand having its own version.
    .version(crate::version::DENO)
    .long_version(LONG_VERSION.as_str())
    .arg(
      Arg::with_name("log-level")
        .short("L")
        .long("log-level")
        .help("Set log level")
        .takes_value(true)
        .possible_values(&["debug", "info"])
        .global(true),
    )
    .arg(
      Arg::with_name("quiet")
        .short("q")
        .long("quiet")
        .help("Suppress diagnostic output")
        .long_help(
          "Suppress diagnostic output
By default, subcommands print human-readable diagnostic messages to stderr.
If the flag is set, restrict these messages to errors.",
        )
        .global(true),
    )
    .subcommand(bundle_subcommand())
    .subcommand(completions_subcommand())
    .subcommand(eval_subcommand())
    .subcommand(fetch_subcommand())
    .subcommand(fmt_subcommand())
    .subcommand(info_subcommand())
    .subcommand(install_subcommand())
    .subcommand(repl_subcommand())
    .subcommand(run_subcommand())
    .subcommand(test_subcommand())
    .subcommand(types_subcommand())
    .subcommand(upgrade_subcommand())
    .subcommand(doc_subcommand())
    .long_about(DENO_HELP)
    .after_help(ENV_VARIABLES_HELP)
}

fn types_parse(flags: &mut Flags, _matches: &clap::ArgMatches) {
  flags.subcommand = DenoSubcommand::Types;
}

fn fmt_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  let files = match matches.values_of("files") {
    Some(f) => f.map(String::from).collect(),
    None => vec![],
  };
  flags.subcommand = DenoSubcommand::Fmt {
    check: matches.is_present("check"),
    files,
  }
}

fn install_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  permission_args_parse(flags, matches);
  ca_file_arg_parse(flags, matches);

  let dir = if matches.is_present("dir") {
    let install_dir = matches.value_of("dir").unwrap();
    Some(PathBuf::from(install_dir))
  } else {
    None
  };

  let force = matches.is_present("force");
  let exe_name = matches.value_of("exe_name").unwrap().to_string();
  let cmd_values = matches.values_of("cmd").unwrap();
  let mut cmd_args = vec![];

  for value in cmd_values {
    cmd_args.push(value.to_string());
  }

  let module_url = cmd_args[0].to_string();
  let args = cmd_args[1..].to_vec();

  flags.subcommand = DenoSubcommand::Install {
    dir,
    exe_name,
    module_url,
    args,
    force,
  };
}

fn bundle_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  ca_file_arg_parse(flags, matches);

  let source_file = matches.value_of("source_file").unwrap().to_string();

  let out_file = if let Some(out_file) = matches.value_of("out_file") {
    flags.allow_write = true;
    Some(PathBuf::from(out_file))
  } else {
    None
  };

  flags.subcommand = DenoSubcommand::Bundle {
    source_file,
    out_file,
  };
}

fn completions_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  let shell: &str = matches.value_of("shell").unwrap();
  let mut buf: Vec<u8> = vec![];
  use std::str::FromStr;
  clap_root().gen_completions_to(
    "deno",
    clap::Shell::from_str(shell).unwrap(),
    &mut buf,
  );

  flags.subcommand = DenoSubcommand::Completions {
    buf: buf.into_boxed_slice(),
  };
}

fn repl_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  v8_flags_arg_parse(flags, matches);
  ca_file_arg_parse(flags, matches);
  inspect_arg_parse(flags, matches);
  flags.subcommand = DenoSubcommand::Repl;
  flags.allow_net = true;
  flags.allow_env = true;
  flags.allow_run = true;
  flags.allow_read = true;
  flags.allow_write = true;
  flags.allow_plugin = true;
  flags.allow_hrtime = true;
}

fn eval_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  v8_flags_arg_parse(flags, matches);
  ca_file_arg_parse(flags, matches);
  inspect_arg_parse(flags, matches);
  flags.allow_net = true;
  flags.allow_env = true;
  flags.allow_run = true;
  flags.allow_read = true;
  flags.allow_write = true;
  flags.allow_plugin = true;
  flags.allow_hrtime = true;
  let code = matches.value_of("code").unwrap().to_string();
  let as_typescript = matches.is_present("ts");
  flags.subcommand = DenoSubcommand::Eval {
    code,
    as_typescript,
  }
}

fn info_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  ca_file_arg_parse(flags, matches);

  flags.subcommand = DenoSubcommand::Info {
    file: matches.value_of("file").map(|f| f.to_string()),
  };
}

fn fetch_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  reload_arg_parse(flags, matches);
  lock_args_parse(flags, matches);
  importmap_arg_parse(flags, matches);
  config_arg_parse(flags, matches);
  no_remote_arg_parse(flags, matches);
  ca_file_arg_parse(flags, matches);
  let files = matches
    .values_of("file")
    .unwrap()
    .map(String::from)
    .collect();
  flags.subcommand = DenoSubcommand::Fetch { files };
}

fn lock_args_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  if matches.is_present("lock") {
    let lockfile = matches.value_of("lock").unwrap();
    flags.lock = Some(lockfile.to_string());
  }
  if matches.is_present("lock-write") {
    flags.lock_write = true;
  }
}

fn resolve_fs_whitelist(whitelist: &[PathBuf]) -> Vec<PathBuf> {
  whitelist
    .iter()
    .map(|raw_path| resolve_from_cwd(Path::new(&raw_path)).unwrap())
    .collect()
}

// Shared between the run and test subcommands. They both take similar options.
fn run_test_args_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  reload_arg_parse(flags, matches);
  lock_args_parse(flags, matches);
  importmap_arg_parse(flags, matches);
  config_arg_parse(flags, matches);
  v8_flags_arg_parse(flags, matches);
  no_remote_arg_parse(flags, matches);
  permission_args_parse(flags, matches);
  ca_file_arg_parse(flags, matches);
  inspect_arg_parse(flags, matches);

  if matches.is_present("cached-only") {
    flags.cached_only = true;
  }

  if matches.is_present("seed") {
    let seed_string = matches.value_of("seed").unwrap();
    let seed = seed_string.parse::<u64>().unwrap();
    flags.seed = Some(seed);

    let v8_seed_flag = format!("--random-seed={}", seed);

    match flags.v8_flags {
      Some(ref mut v8_flags) => {
        v8_flags.push(v8_seed_flag);
      }
      None => {
        flags.v8_flags = Some(svec![v8_seed_flag]);
      }
    }
  }
}

fn run_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  run_test_args_parse(flags, matches);

  let mut script: Vec<String> = matches
    .values_of("script_arg")
    .unwrap()
    .map(String::from)
    .collect();
  assert!(!script.is_empty());
  let script_args = script.split_off(1);
  let script = script[0].to_string();
  for v in script_args {
    flags.argv.push(v);
  }

  flags.subcommand = DenoSubcommand::Run { script };
}

fn test_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  flags.allow_read = true;

  run_test_args_parse(flags, matches);

  let failfast = matches.is_present("failfast");
  let allow_none = matches.is_present("allow_none");
  let filter = matches.value_of("filter").map(String::from);
  let include = if matches.is_present("files") {
    let files: Vec<String> = matches
      .values_of("files")
      .unwrap()
      .map(String::from)
      .collect();
    Some(files)
  } else {
    None
  };

  flags.subcommand = DenoSubcommand::Test {
    fail_fast: failfast,
    include,
    filter,
    allow_none,
  };
}

fn upgrade_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  let dry_run = matches.is_present("dry-run");
  let force = matches.is_present("force");
  flags.subcommand = DenoSubcommand::Upgrade { dry_run, force };
}

fn doc_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  reload_arg_parse(flags, matches);
  let source_file = matches.value_of("source_file").map(String::from).unwrap();
  let json = matches.is_present("json");
  let filter = matches.value_of("filter").map(String::from);
  flags.subcommand = DenoSubcommand::Doc {
    source_file,
    json,
    filter,
  };
}

fn types_subcommand<'a, 'b>() -> App<'a, 'b> {
  SubCommand::with_name("types")
    .about("Print runtime TypeScript declarations")
    .long_about(
      "Print runtime TypeScript declarations.
  deno types > lib.deno_runtime.d.ts

The declaration file could be saved and used for typing information.",
    )
}

fn fmt_subcommand<'a, 'b>() -> App<'a, 'b> {
  SubCommand::with_name("fmt")
    .about("Format source files")
    .long_about(
      "Auto-format JavaScript/TypeScript source code.
  deno fmt
  deno fmt myfile1.ts myfile2.ts
  deno fmt --check

Format stdin and write to stdout:
  cat file.ts | deno fmt -",
    )
    .arg(
      Arg::with_name("check")
        .long("check")
        .help("Check if the source files are formatted.")
        .takes_value(false),
    )
    .arg(
      Arg::with_name("files")
        .takes_value(true)
        .multiple(true)
        .required(false),
    )
}

fn repl_subcommand<'a, 'b>() -> App<'a, 'b> {
  inspect_args(SubCommand::with_name("repl"))
    .about("Read Eval Print Loop")
    .arg(v8_flags_arg())
    .arg(ca_file_arg())
}

fn install_subcommand<'a, 'b>() -> App<'a, 'b> {
  permission_args(SubCommand::with_name("install"))
        .setting(AppSettings::TrailingVarArg)
        .arg(
          Arg::with_name("dir")
            .long("dir")
            .short("d")
            .help("Installation directory (defaults to $HOME/.deno/bin)")
            .takes_value(true)
            .multiple(false))
        .arg(
          Arg::with_name("force")
            .long("force")
            .short("f")
            .help("Forcefully overwrite existing installation")
            .takes_value(false))
        .arg(
          Arg::with_name("exe_name")
            .required(true)
        )
        .arg(
          Arg::with_name("cmd")
            .required(true)
            .multiple(true)
            .allow_hyphen_values(true)
        )
        .arg(ca_file_arg())
        .about("Install script as executable")
        .long_about(
"Installs a script as executable. The default installation directory is
$HOME/.deno/bin and it must be added to the path manually.
  deno install --allow-net --allow-read file_server https://deno.land/std/http/file_server.ts
  deno install colors https://deno.land/std/examples/colors.ts

To change installation directory use -d/--dir flag:
  deno install --allow-net --allow-read -d /usr/local/bin file_server https://deno.land/std/http/file_server.ts")
}

fn bundle_subcommand<'a, 'b>() -> App<'a, 'b> {
  SubCommand::with_name("bundle")
    .arg(
      Arg::with_name("source_file")
        .takes_value(true)
        .required(true),
    )
    .arg(Arg::with_name("out_file").takes_value(true).required(false))
    .arg(ca_file_arg())
    .about("Bundle module and dependencies into single file")
    .long_about(
      "Output a single JavaScript file with all dependencies.
  deno bundle https://deno.land/std/examples/colors.ts colors.bundle.js

If no output file is given, the output is written to standard output:
  deno bundle https://deno.land/std/examples/colors.ts",
    )
}

fn completions_subcommand<'a, 'b>() -> App<'a, 'b> {
  SubCommand::with_name("completions")
    .setting(AppSettings::DisableHelpSubcommand)
    .arg(
      Arg::with_name("shell")
        .possible_values(&clap::Shell::variants())
        .required(true),
    )
    .about("Generate shell completions")
    .long_about(
      "Output shell completion script to standard output.
  deno completions bash > /usr/local/etc/bash_completion.d/deno.bash
  source /usr/local/etc/bash_completion.d/deno.bash",
    )
}

fn eval_subcommand<'a, 'b>() -> App<'a, 'b> {
  inspect_args(SubCommand::with_name("eval"))
    .arg(ca_file_arg())
    .about("Eval script")
    .long_about(
      "Evaluate JavaScript from the command line.
  deno eval \"console.log('hello world')\"

To evaluate as TypeScript:
  deno eval -T \"const v: string = 'hello'; console.log(v)\"

This command has implicit access to all permissions (--allow-all).",
    )
    .arg(
      Arg::with_name("ts")
        .long("ts")
        .short("T")
        .help("Treat eval input as TypeScript")
        .takes_value(false)
        .multiple(false),
    )
    .arg(Arg::with_name("code").takes_value(true).required(true))
    .arg(v8_flags_arg())
}

fn info_subcommand<'a, 'b>() -> App<'a, 'b> {
  SubCommand::with_name("info")
    .about("Show info about cache or info related to source file")
    .long_about(
      "Information about a module or the cache directories.

Get information about a module:
  deno info https://deno.land/std/http/file_server.ts

The following information is shown:

local: Local path of the file.
type: JavaScript, TypeScript, or JSON.
compiled: Local path of compiled source code. (TypeScript only.)
map: Local path of source map. (TypeScript only.)
deps: Dependency tree of the source file.

Without any additional arguments, 'deno info' shows:

DENO_DIR: Directory containing Deno-managed files.
Remote modules cache: Subdirectory containing downloaded remote modules.
TypeScript compiler cache: Subdirectory containing TS compiler output.",
    )
    .arg(Arg::with_name("file").takes_value(true).required(false))
    .arg(ca_file_arg())
}

fn fetch_subcommand<'a, 'b>() -> App<'a, 'b> {
  SubCommand::with_name("fetch")
    .arg(reload_arg())
    .arg(lock_arg())
    .arg(lock_write_arg())
    .arg(importmap_arg())
    .arg(config_arg())
    .arg(no_remote_arg())
    .arg(
      Arg::with_name("file")
        .takes_value(true)
        .required(true)
        .min_values(1),
    )
    .arg(ca_file_arg())
    .about("Fetch the dependencies")
    .long_about(
      "Fetch and compile remote dependencies recursively.

Download and compile a module with all of its static dependencies and save them
in the local cache, without running any code:
  deno fetch https://deno.land/std/http/file_server.ts

Future runs of this module will trigger no downloads or compilation unless
--reload is specified.",
    )
}

fn upgrade_subcommand<'a, 'b>() -> App<'a, 'b> {
  SubCommand::with_name("upgrade")
    .about("Upgrade deno executable to newest version")
    .long_about(
      "Upgrade deno executable to newest available version.

The latest version is downloaded from
https://github.com/denoland/deno/releases
and is used to replace the current executable.",
    )
    .arg(
      Arg::with_name("dry-run")
        .long("dry-run")
        .help("Perform all checks without replacing old exe"),
    )
    .arg(
      Arg::with_name("force")
        .long("force")
        .short("f")
        .help("Replace current exe even if not out-of-date"),
    )
}

fn doc_subcommand<'a, 'b>() -> App<'a, 'b> {
  SubCommand::with_name("doc")
    .about("Show documentation for module")
    .long_about(
      "Show documentation for module.

Output documentation to terminal:
    deno doc ./path/to/module.ts

Show detail of symbol:
    deno doc ./path/to/module.ts MyClass.someField

Output documentation in JSON format:
    deno doc --json ./path/to/module.ts",
    )
    .arg(reload_arg())
    .arg(
      Arg::with_name("json")
        .long("json")
        .help("Output documentation in JSON format.")
        .takes_value(false),
    )
    .arg(
      Arg::with_name("source_file")
        .takes_value(true)
        .required(true),
    )
    .arg(
      Arg::with_name("filter")
        .help("Dot separated path to symbol.")
        .takes_value(true)
        .required(false)
        .conflicts_with("json")
        .conflicts_with("pretty"),
    )
}

fn permission_args<'a, 'b>(app: App<'a, 'b>) -> App<'a, 'b> {
  app
    .arg(
      Arg::with_name("allow-read")
        .long("allow-read")
        .min_values(0)
        .takes_value(true)
        .use_delimiter(true)
        .require_equals(true)
        .help("Allow file system read access"),
    )
    .arg(
      Arg::with_name("allow-write")
        .long("allow-write")
        .min_values(0)
        .takes_value(true)
        .use_delimiter(true)
        .require_equals(true)
        .help("Allow file system write access"),
    )
    .arg(
      Arg::with_name("allow-net")
        .long("allow-net")
        .min_values(0)
        .takes_value(true)
        .use_delimiter(true)
        .require_equals(true)
        .help("Allow network access"),
    )
    .arg(
      Arg::with_name("allow-env")
        .long("allow-env")
        .help("Allow environment access"),
    )
    .arg(
      Arg::with_name("allow-run")
        .long("allow-run")
        .help("Allow running subprocesses"),
    )
    .arg(
      Arg::with_name("allow-plugin")
        .long("allow-plugin")
        .help("Allow loading plugins"),
    )
    .arg(
      Arg::with_name("allow-hrtime")
        .long("allow-hrtime")
        .help("Allow high resolution time measurement"),
    )
    .arg(
      Arg::with_name("allow-all")
        .short("A")
        .long("allow-all")
        .help("Allow all permissions"),
    )
}

fn run_test_args<'a, 'b>(app: App<'a, 'b>) -> App<'a, 'b> {
  permission_args(inspect_args(app))
    .arg(importmap_arg())
    .arg(reload_arg())
    .arg(config_arg())
    .arg(lock_arg())
    .arg(lock_write_arg())
    .arg(no_remote_arg())
    .arg(v8_flags_arg())
    .arg(ca_file_arg())
    .arg(
      Arg::with_name("cached-only")
        .long("cached-only")
        .help("Require that remote dependencies are already cached"),
    )
    .arg(
      Arg::with_name("seed")
        .long("seed")
        .value_name("NUMBER")
        .help("Seed Math.random()")
        .takes_value(true)
        .validator(|val: String| match val.parse::<u64>() {
          Ok(_) => Ok(()),
          Err(_) => Err("Seed should be a number".to_string()),
        }),
    )
}

fn run_subcommand<'a, 'b>() -> App<'a, 'b> {
  run_test_args(SubCommand::with_name("run"))
    .setting(AppSettings::TrailingVarArg)
    .arg(script_arg())
    .about("Run a program given a filename or url to the module")
    .long_about(
      "Run a program given a filename or url to the module.

By default all programs are run in sandbox without access to disk, network or
ability to spawn subprocesses.
  deno run https://deno.land/std/examples/welcome.ts

Grant all permissions:
  deno run -A https://deno.land/std/http/file_server.ts

Grant permission to read from disk and listen to network:
  deno run --allow-read --allow-net https://deno.land/std/http/file_server.ts

Grant permission to read whitelisted files from disk:
  deno run --allow-read=/etc https://deno.land/std/http/file_server.ts",
    )
}

fn test_subcommand<'a, 'b>() -> App<'a, 'b> {
  run_test_args(SubCommand::with_name("test"))
    .arg(
      Arg::with_name("failfast")
        .long("failfast")
        .help("Stop on first error")
        .takes_value(false),
    )
    .arg(
      Arg::with_name("allow_none")
        .long("allow-none")
        .help("Don't return error code if no test files are found")
        .takes_value(false),
    )
    .arg(
      Arg::with_name("filter")
        .long("filter")
        .takes_value(true)
        .help("A pattern to filter the tests to run by"),
    )
    .arg(
      Arg::with_name("files")
        .help("List of file names to run")
        .takes_value(true)
        .multiple(true),
    )
    .about("Run tests")
    .long_about(
      "Run tests using Deno's built-in test runner.

Evaluate the given modules, run all tests declared with 'Deno.test()' and
report results to standard output:
  deno test src/fetch_test.ts src/signal_test.ts

Directory arguments are expanded to all contained files matching the glob
{*_,}test.{js,ts,jsx,tsx}:
  deno test src/",
    )
}

fn script_arg<'a, 'b>() -> Arg<'a, 'b> {
  Arg::with_name("script_arg")
    .multiple(true)
    .required(true)
    .help("script args")
    .value_name("SCRIPT_ARG")
}

fn lock_arg<'a, 'b>() -> Arg<'a, 'b> {
  Arg::with_name("lock")
    .long("lock")
    .value_name("FILE")
    .help("Check the specified lock file")
    .takes_value(true)
}

fn lock_write_arg<'a, 'b>() -> Arg<'a, 'b> {
  Arg::with_name("lock-write")
    .long("lock-write")
    .help("Write lock file. Use with --lock.")
}

fn config_arg<'a, 'b>() -> Arg<'a, 'b> {
  Arg::with_name("config")
    .short("c")
    .long("config")
    .value_name("FILE")
    .help("Load tsconfig.json configuration file")
    .takes_value(true)
}

fn config_arg_parse(flags: &mut Flags, matches: &ArgMatches) {
  flags.config_path = matches.value_of("config").map(ToOwned::to_owned);
}

fn ca_file_arg<'a, 'b>() -> Arg<'a, 'b> {
  Arg::with_name("cert")
    .long("cert")
    .value_name("FILE")
    .help("Load certificate authority from PEM encoded file")
    .takes_value(true)
}

fn ca_file_arg_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  flags.ca_file = matches.value_of("cert").map(ToOwned::to_owned);
}

fn inspect_args<'a, 'b>(app: App<'a, 'b>) -> App<'a, 'b> {
  app
    .arg(
      Arg::with_name("inspect")
        .long("inspect")
        .value_name("HOST:PORT")
        .help("activate inspector on host:port (default: 127.0.0.1:9229)")
        .min_values(0)
        .max_values(1)
        .require_equals(true)
        .takes_value(true)
        .validator(inspect_arg_validate),
    )
    .arg(
      Arg::with_name("inspect-brk")
        .long("inspect-brk")
        .value_name("HOST:PORT")
        .help(
          "activate inspector on host:port and break at start of user script",
        )
        .min_values(0)
        .max_values(1)
        .require_equals(true)
        .takes_value(true)
        .validator(inspect_arg_validate),
    )
}

fn inspect_arg_validate(val: String) -> Result<(), String> {
  match val.parse::<SocketAddr>() {
    Ok(_) => Ok(()),
    Err(e) => Err(e.to_string()),
  }
}

fn inspect_arg_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  let default = || "127.0.0.1:9229".parse::<SocketAddr>().unwrap();
  flags.inspect = if matches.is_present("inspect") {
    if let Some(host) = matches.value_of("inspect") {
      Some(host.parse().unwrap())
    } else {
      Some(default())
    }
  } else {
    None
  };
  flags.inspect_brk = if matches.is_present("inspect-brk") {
    if let Some(host) = matches.value_of("inspect-brk") {
      Some(host.parse().unwrap())
    } else {
      Some(default())
    }
  } else {
    None
  };
}

fn reload_arg<'a, 'b>() -> Arg<'a, 'b> {
  Arg::with_name("reload")
    .short("r")
    .min_values(0)
    .takes_value(true)
    .use_delimiter(true)
    .require_equals(true)
    .long("reload")
    .help("Reload source code cache (recompile TypeScript)")
    .value_name("CACHE_BLACKLIST")
    .long_help(
      "Reload source code cache (recompile TypeScript)
--reload
  Reload everything
--reload=https://deno.land/std
  Reload only standard modules
--reload=https://deno.land/std/fs/utils.ts,https://deno.land/std/fmt/colors.ts
  Reloads specific modules",
    )
}

fn reload_arg_parse(flags: &mut Flags, matches: &ArgMatches) {
  if matches.is_present("reload") {
    if matches.value_of("reload").is_some() {
      let cache_bl = matches.values_of("reload").unwrap();
      let raw_cache_blacklist: Vec<String> =
        cache_bl.map(std::string::ToString::to_string).collect();
      flags.cache_blacklist = resolve_urls(raw_cache_blacklist);
      debug!("cache blacklist: {:#?}", &flags.cache_blacklist);
      flags.reload = false;
    } else {
      flags.reload = true;
    }
  }
}

fn importmap_arg<'a, 'b>() -> Arg<'a, 'b> {
  Arg::with_name("importmap")
    .long("importmap")
    .value_name("FILE")
    .help("Load import map file")
    .long_help(
      "Load import map file
Docs: https://deno.land/std/manual.md#import-maps
Specification: https://wicg.github.io/import-maps/
Examples: https://github.com/WICG/import-maps#the-import-map",
    )
    .takes_value(true)
}

fn importmap_arg_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  flags.import_map_path = matches.value_of("importmap").map(ToOwned::to_owned);
}

fn v8_flags_arg<'a, 'b>() -> Arg<'a, 'b> {
  Arg::with_name("v8-flags")
    .long("v8-flags")
    .takes_value(true)
    .use_delimiter(true)
    .require_equals(true)
    .help("Set V8 command line options. For help: --v8-flags=--help")
}

fn v8_flags_arg_parse(flags: &mut Flags, matches: &ArgMatches) {
  if let Some(v8_flags) = matches.values_of("v8-flags") {
    let s: Vec<String> = v8_flags.map(String::from).collect();
    flags.v8_flags = Some(s);
  }
}

fn no_remote_arg<'a, 'b>() -> Arg<'a, 'b> {
  Arg::with_name("no-remote")
    .long("no-remote")
    .help("Do not resolve remote modules")
}

fn no_remote_arg_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  if matches.is_present("no-remote") {
    flags.no_remote = true;
  }
}

fn permission_args_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
  if matches.is_present("allow-read") {
    if matches.value_of("allow-read").is_some() {
      let read_wl = matches.values_of("allow-read").unwrap();
      let raw_read_whitelist: Vec<PathBuf> =
        read_wl.map(PathBuf::from).collect();
      flags.read_whitelist = resolve_fs_whitelist(&raw_read_whitelist);
      debug!("read whitelist: {:#?}", &flags.read_whitelist);
    } else {
      flags.allow_read = true;
    }
  }
  if matches.is_present("allow-write") {
    if matches.value_of("allow-write").is_some() {
      let write_wl = matches.values_of("allow-write").unwrap();
      let raw_write_whitelist: Vec<PathBuf> =
        write_wl.map(PathBuf::from).collect();
      flags.write_whitelist = resolve_fs_whitelist(&raw_write_whitelist);
      debug!("write whitelist: {:#?}", &flags.write_whitelist);
    } else {
      flags.allow_write = true;
    }
  }
  if matches.is_present("allow-net") {
    if matches.value_of("allow-net").is_some() {
      let net_wl = matches.values_of("allow-net").unwrap();
      let raw_net_whitelist =
        net_wl.map(std::string::ToString::to_string).collect();
      flags.net_whitelist = resolve_hosts(raw_net_whitelist);
      debug!("net whitelist: {:#?}", &flags.net_whitelist);
    } else {
      flags.allow_net = true;
    }
  }
  if matches.is_present("allow-env") {
    flags.allow_env = true;
  }
  if matches.is_present("allow-run") {
    flags.allow_run = true;
  }
  if matches.is_present("allow-plugin") {
    flags.allow_plugin = true;
  }
  if matches.is_present("allow-hrtime") {
    flags.allow_hrtime = true;
  }
  if matches.is_present("allow-all") {
    flags.allow_read = true;
    flags.allow_env = true;
    flags.allow_net = true;
    flags.allow_run = true;
    flags.allow_read = true;
    flags.allow_write = true;
    flags.allow_plugin = true;
    flags.allow_hrtime = true;
  }
}

// TODO(ry) move this to utility module and add test.
/// Strips fragment part of URL. Panics on bad URL.
pub fn resolve_urls(urls: Vec<String>) -> Vec<String> {
  use url::Url;
  let mut out: Vec<String> = vec![];
  for urlstr in urls.iter() {
    use std::str::FromStr;
    let result = Url::from_str(urlstr);
    if result.is_err() {
      panic!("Bad Url: {}", urlstr);
    }
    let mut url = result.unwrap();
    url.set_fragment(None);
    let mut full_url = String::from(url.as_str());
    if full_url.len() > 1 && full_url.ends_with('/') {
      full_url.pop();
    }
    out.push(full_url);
  }
  out
}

/// Expands "bare port" paths (eg. ":8080") into full paths with hosts. It
/// expands to such paths into 3 paths with following hosts: `0.0.0.0:port`,
/// `127.0.0.1:port` and `localhost:port`.
fn resolve_hosts(paths: Vec<String>) -> Vec<String> {
  let mut out: Vec<String> = vec![];
  for host_and_port in paths.iter() {
    let parts = host_and_port.split(':').collect::<Vec<&str>>();

    match parts.len() {
      // host only
      1 => {
        out.push(host_and_port.to_owned());
      }
      // host and port (NOTE: host might be empty string)
      2 => {
        let host = parts[0];
        let port = parts[1];

        if !host.is_empty() {
          out.push(host_and_port.to_owned());
          continue;
        }

        // we got bare port, let's add default hosts
        for host in ["0.0.0.0", "127.0.0.1", "localhost"].iter() {
          out.push(format!("{}:{}", host, port));
        }
      }
      _ => panic!("Bad host:port pair: {}", host_and_port),
    }
  }

  out
}

fn arg_hacks(mut args: Vec<String>) -> Vec<String> {
  // Hack #1 We want to default the subcommand to "run"
  // Clap does not let us have a default sub-command. But we want to allow users
  // to do "deno script.js" instead of "deno run script.js".
  // This function insert the "run" into the second position of the args.
  assert!(!args.is_empty());
  // Rational:
  // deno -> deno repl
  if args.len() == 1 {
    args.insert(1, "repl".to_string());
    return args;
  }
  let subcommands = sset![
    "bundle",
    "completions",
    "doc",
    "eval",
    "fetch",
    "fmt",
    "test",
    "info",
    "repl",
    "run",
    "types",
    "install",
    "help",
    "version",
    "upgrade"
  ];
  let modifier_flags = sset!["-h", "--help", "-V", "--version"];
  // deno [subcommand|behavior modifier flags] -> do nothing
  if subcommands.contains(&args[1]) || modifier_flags.contains(&args[1]) {
    return args;
  }
  // This is not perfect either, since originally we should also
  // support e.g. `-L debug` which `debug` would be treated as main module.
  // Instead `-L=debug` must be used
  let mut has_main_module = false;
  for arg in args.iter().skip(1) {
    if !arg.starts_with('-') {
      has_main_module = true;
      break;
    }
  }
  if has_main_module {
    // deno ...-[flags] NAME ... -> deno run ...-[flags] NAME ...
    args.insert(1, "run".to_string());
  } else {
    // deno ...-[flags] -> deno repl ...-[flags]
    args.insert(1, "repl".to_string());
  }
  args
}

#[cfg(test)]
mod tests {
  use super::*;
  use std::env::current_dir;

  #[test]
  fn arg_hacks_test() {
    let args0 = arg_hacks(svec!["deno", "--version"]);
    assert_eq!(args0, ["deno", "--version"]);
    let args1 = arg_hacks(svec!["deno"]);
    assert_eq!(args1, ["deno", "repl"]);
    let args2 = arg_hacks(svec!["deno", "-L=debug", "-h"]);
    assert_eq!(args2, ["deno", "repl", "-L=debug", "-h"]);
    let args3 = arg_hacks(svec!["deno", "script.js"]);
    assert_eq!(args3, ["deno", "run", "script.js"]);
    let args4 = arg_hacks(svec!["deno", "-A", "script.js", "-L=info"]);
    assert_eq!(args4, ["deno", "run", "-A", "script.js", "-L=info"]);
  }

  #[test]
  fn upgrade() {
    let r =
      flags_from_vec_safe(svec!["deno", "upgrade", "--dry-run", "--force"]);
    let flags = r.unwrap();
    assert_eq!(
      flags,
      Flags {
        subcommand: DenoSubcommand::Upgrade {
          force: true,
          dry_run: true,
        },
        ..Flags::default()
      }
    );
  }

  #[test]
  fn version() {
    let r = flags_from_vec_safe(svec!["deno", "--version"]);
    assert_eq!(r.unwrap_err().kind, clap::ErrorKind::VersionDisplayed);
    let r = flags_from_vec_safe(svec!["deno", "-V"]);
    assert_eq!(r.unwrap_err().kind, clap::ErrorKind::VersionDisplayed);
  }

  #[test]
  fn run_reload() {
    let r = flags_from_vec_safe(svec!["deno", "run", "-r", "script.ts"]);
    let flags = r.unwrap();
    assert_eq!(
      flags,
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        reload: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn run_reload_allow_write() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "run",
      "-r",
      "--allow-write",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        reload: true,
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        allow_write: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn run_v8_flags() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "run",
      "--v8-flags=--help",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        v8_flags: Some(svec!["--help"]),
        ..Flags::default()
      }
    );

    let r = flags_from_vec_safe(svec![
      "deno",
      "run",
      "--v8-flags=--expose-gc,--gc-stats=1",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        v8_flags: Some(svec!["--expose-gc", "--gc-stats=1"]),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn script_args() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "run",
      "--allow-net",
      "gist.ts",
      "--title",
      "X"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "gist.ts".to_string(),
        },
        argv: svec!["--title", "X"],
        allow_net: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn allow_all() {
    let r = flags_from_vec_safe(svec!["deno", "run", "--allow-all", "gist.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "gist.ts".to_string(),
        },
        allow_net: true,
        allow_env: true,
        allow_run: true,
        allow_read: true,
        allow_write: true,
        allow_plugin: true,
        allow_hrtime: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn allow_read() {
    let r =
      flags_from_vec_safe(svec!["deno", "run", "--allow-read", "gist.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "gist.ts".to_string(),
        },
        allow_read: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn allow_hrtime() {
    let r =
      flags_from_vec_safe(svec!["deno", "run", "--allow-hrtime", "gist.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "gist.ts".to_string(),
        },
        allow_hrtime: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn double_hyphen() {
    // notice that flags passed after double dash will not
    // be parsed to Flags but instead forwarded to
    // script args as Deno.args
    let r = flags_from_vec_safe(svec![
      "deno",
      "run",
      "--allow-write",
      "script.ts",
      "--",
      "-D",
      "--allow-net"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        argv: svec!["--", "-D", "--allow-net"],
        allow_write: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn fmt() {
    let r =
      flags_from_vec_safe(svec!["deno", "fmt", "script_1.ts", "script_2.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Fmt {
          check: false,
          files: vec!["script_1.ts".to_string(), "script_2.ts".to_string()]
        },
        ..Flags::default()
      }
    );

    let r = flags_from_vec_safe(svec!["deno", "fmt", "--check"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Fmt {
          check: true,
          files: vec![],
        },
        ..Flags::default()
      }
    );

    let r = flags_from_vec_safe(svec!["deno", "fmt"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Fmt {
          check: false,
          files: vec![],
        },
        ..Flags::default()
      }
    );
  }

  #[test]
  fn types() {
    let r = flags_from_vec_safe(svec!["deno", "types"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Types,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn fetch() {
    let r = flags_from_vec_safe(svec!["deno", "fetch", "script.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Fetch {
          files: svec!["script.ts"],
        },
        ..Flags::default()
      }
    );
  }

  #[test]
  fn info() {
    let r = flags_from_vec_safe(svec!["deno", "info", "script.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Info {
          file: Some("script.ts".to_string()),
        },
        ..Flags::default()
      }
    );

    let r = flags_from_vec_safe(svec!["deno", "info"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Info { file: None },
        ..Flags::default()
      }
    );
  }

  #[test]
  fn tsconfig() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "run",
      "-c",
      "tsconfig.json",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        config_path: Some("tsconfig.json".to_owned()),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn eval() {
    let r =
      flags_from_vec_safe(svec!["deno", "eval", "'console.log(\"hello\")'"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Eval {
          code: "'console.log(\"hello\")'".to_string(),
          as_typescript: false,
        },
        allow_net: true,
        allow_env: true,
        allow_run: true,
        allow_read: true,
        allow_write: true,
        allow_plugin: true,
        allow_hrtime: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn eval_typescript() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "eval",
      "-T",
      "'console.log(\"hello\")'"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Eval {
          code: "'console.log(\"hello\")'".to_string(),
          as_typescript: true,
        },
        allow_net: true,
        allow_env: true,
        allow_run: true,
        allow_read: true,
        allow_write: true,
        allow_plugin: true,
        allow_hrtime: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn eval_with_v8_flags() {
    let r =
      flags_from_vec_safe(svec!["deno", "eval", "--v8-flags=--help", "42"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Eval {
          code: "42".to_string(),
          as_typescript: false,
        },
        v8_flags: Some(svec!["--help"]),
        allow_net: true,
        allow_env: true,
        allow_run: true,
        allow_read: true,
        allow_write: true,
        allow_plugin: true,
        allow_hrtime: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn repl() {
    let r = flags_from_vec_safe(svec!["deno"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Repl,
        allow_net: true,
        allow_env: true,
        allow_run: true,
        allow_read: true,
        allow_write: true,
        allow_plugin: true,
        allow_hrtime: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn allow_read_whitelist() {
    use tempfile::TempDir;
    let temp_dir = TempDir::new().expect("tempdir fail").path().to_path_buf();

    let r = flags_from_vec_safe(svec![
      "deno",
      "run",
      format!("--allow-read=.,{}", temp_dir.to_str().unwrap()),
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        allow_read: false,
        read_whitelist: vec![current_dir().unwrap(), temp_dir],
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        ..Flags::default()
      }
    );
  }

  #[test]
  fn allow_write_whitelist() {
    use tempfile::TempDir;
    let temp_dir = TempDir::new().expect("tempdir fail").path().to_path_buf();

    let r = flags_from_vec_safe(svec![
      "deno",
      "run",
      format!("--allow-write=.,{}", temp_dir.to_str().unwrap()),
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        allow_write: false,
        write_whitelist: vec![current_dir().unwrap(), temp_dir],
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        ..Flags::default()
      }
    );
  }

  #[test]
  fn allow_net_whitelist() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "run",
      "--allow-net=127.0.0.1",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        allow_net: false,
        net_whitelist: svec!["127.0.0.1"],
        ..Flags::default()
      }
    );
  }

  #[test]
  fn default_to_run() {
    let r = flags_from_vec_safe(svec!["deno", "script.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        ..Flags::default()
      }
    );
  }

  #[test]
  fn default_to_run_with_permissions() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "--allow-net",
      "--allow-read",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        allow_net: true,
        allow_read: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn bundle() {
    let r = flags_from_vec_safe(svec!["deno", "bundle", "source.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Bundle {
          source_file: "source.ts".to_string(),
          out_file: None,
        },
        ..Flags::default()
      }
    );
  }

  #[test]
  fn bundle_with_output() {
    let r =
      flags_from_vec_safe(svec!["deno", "bundle", "source.ts", "bundle.js"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Bundle {
          source_file: "source.ts".to_string(),
          out_file: Some(PathBuf::from("bundle.js")),
        },
        allow_write: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn run_importmap() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "run",
      "--importmap=importmap.json",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        import_map_path: Some("importmap.json".to_owned()),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn default_to_run_importmap() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "--importmap=importmap.json",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        import_map_path: Some("importmap.json".to_owned()),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn fetch_importmap() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "fetch",
      "--importmap=importmap.json",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Fetch {
          files: svec!["script.ts"],
        },
        import_map_path: Some("importmap.json".to_owned()),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn fetch_multiple() {
    let r =
      flags_from_vec_safe(svec!["deno", "fetch", "script.ts", "script_two.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Fetch {
          files: svec!["script.ts", "script_two.ts"],
        },
        ..Flags::default()
      }
    );
  }

  #[test]
  fn run_seed() {
    let r =
      flags_from_vec_safe(svec!["deno", "run", "--seed", "250", "script.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        seed: Some(250 as u64),
        v8_flags: Some(svec!["--random-seed=250"]),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn run_seed_with_v8_flags() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "run",
      "--seed",
      "250",
      "--v8-flags=--expose-gc",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        seed: Some(250 as u64),
        v8_flags: Some(svec!["--expose-gc", "--random-seed=250"]),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn install() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "install",
      "deno_colors",
      "https://deno.land/std/examples/colors.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Install {
          dir: None,
          exe_name: "deno_colors".to_string(),
          module_url: "https://deno.land/std/examples/colors.ts".to_string(),
          args: vec![],
          force: false,
        },
        ..Flags::default()
      }
    );
  }

  #[test]
  fn install_with_args() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "install",
      "--allow-net",
      "--allow-read",
      "file_server",
      "https://deno.land/std/http/file_server.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Install {
          dir: None,
          exe_name: "file_server".to_string(),
          module_url: "https://deno.land/std/http/file_server.ts".to_string(),
          args: vec![],
          force: false,
        },
        allow_net: true,
        allow_read: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn install_with_args_and_dir_and_force() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "install",
      "-d",
      "/usr/local/bin",
      "-f",
      "--allow-net",
      "--allow-read",
      "file_server",
      "https://deno.land/std/http/file_server.ts",
      "arg1",
      "arg2"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Install {
          dir: Some(PathBuf::from("/usr/local/bin")),
          exe_name: "file_server".to_string(),
          module_url: "https://deno.land/std/http/file_server.ts".to_string(),
          args: svec!["arg1", "arg2"],
          force: true,
        },
        allow_net: true,
        allow_read: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn log_level() {
    let r =
      flags_from_vec_safe(svec!["deno", "--log-level=debug", "script.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        log_level: Some(Level::Debug),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn quiet() {
    let r = flags_from_vec_safe(svec!["deno", "-q", "script.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        log_level: Some(Level::Error),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn completions() {
    let r = flags_from_vec_safe(svec!["deno", "completions", "bash"]).unwrap();

    match r.subcommand {
      DenoSubcommand::Completions { buf } => assert!(!buf.is_empty()),
      _ => unreachable!(),
    }
  }

  /* TODO(ry) Fix this test
  #[test]
  fn test_flags_from_vec_33() {
    let (flags, subcommand, argv) =
      flags_from_vec_safe(svec!["deno", "script.ts", "--allow-read", "--allow-net"]);
    assert_eq!(
      flags,
      Flags {
        allow_net: true,
        allow_read: true,
        ..Flags::default()
      }
    );
    assert_eq!(subcommand, DenoSubcommand::Run);
    assert_eq!(argv, svec!["script.ts"]);

    let (flags, subcommand, argv) = flags_from_vec_safe(svec![
      "deno",
      "run",
      "--allow-read",
      "script.ts",
      "--allow-net",
      "-r",
      "--help",
      "--foo",
      "bar"
    ]);
    assert_eq!(
      flags,
      Flags {
        allow_net: true,
        allow_read: true,
        reload: true,
        ..Flags::default()
      }
    );
    assert_eq!(subcommand, DenoSubcommand::Run);
    assert_eq!(argv, svec!["deno", "script.ts", "--help", "--foo", "bar"]);

    let (flags, subcommand, argv) =
      flags_from_vec_safe(svec!["deno""script.ts", "foo", "bar"]);
    assert_eq!(flags, Flags::default());
    assert_eq!(subcommand, DenoSubcommand::Run);
  assert_eq!(argv, svec!["script.ts", "foo", "bar"]);

    let (flags, subcommand, argv) =
      flags_from_vec_safe(svec!["deno""script.ts", "-"]);
    assert_eq!(flags, Flags::default());
    assert_eq!(subcommand, DenoSubcommand::Run);
    assert_eq!(argv, svec!["script.ts", "-"]);

    let (flags, subcommand, argv) =
      flags_from_vec_safe(svec!["deno""script.ts", "-", "foo", "bar"]);
    assert_eq!(flags, Flags::default());
    assert_eq!(subcommand, DenoSubcommand::Run);
    assert_eq!(argv, svec!["script.ts", "-", "foo", "bar"]);
  }
  */

  #[test]
  fn no_remote() {
    let r = flags_from_vec_safe(svec!["deno", "--no-remote", "script.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        no_remote: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn cached_only() {
    let r = flags_from_vec_safe(svec!["deno", "--cached-only", "script.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        cached_only: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn allow_net_whitelist_with_ports() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "--allow-net=deno.land,:8000,:4545",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        net_whitelist: svec![
          "deno.land",
          "0.0.0.0:8000",
          "127.0.0.1:8000",
          "localhost:8000",
          "0.0.0.0:4545",
          "127.0.0.1:4545",
          "localhost:4545"
        ],
        ..Flags::default()
      }
    );
  }

  #[test]
  fn lock_write() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "--lock-write",
      "--lock=lock.json",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        lock_write: true,
        lock: Some("lock.json".to_string()),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn test_with_allow_net() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "test",
      "--allow-net",
      "--allow-none",
      "dir1/",
      "dir2/"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Test {
          fail_fast: false,
          filter: None,
          allow_none: true,
          include: Some(svec!["dir1/", "dir2/"]),
        },
        allow_read: true,
        allow_net: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn test_filter() {
    let r = flags_from_vec_safe(svec!["deno", "test", "--filter=foo", "dir1"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Test {
          fail_fast: false,
          allow_none: false,
          filter: Some("foo".to_string()),
          include: Some(svec!["dir1"]),
        },
        allow_read: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn run_with_cafile() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "run",
      "--cert",
      "example.crt",
      "script.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "script.ts".to_string(),
        },
        ca_file: Some("example.crt".to_owned()),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn bundle_with_cafile() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "bundle",
      "--cert",
      "example.crt",
      "source.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Bundle {
          source_file: "source.ts".to_string(),
          out_file: None,
        },
        ca_file: Some("example.crt".to_owned()),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn eval_with_cafile() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "eval",
      "--cert",
      "example.crt",
      "console.log('hello world')"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Eval {
          code: "console.log('hello world')".to_string(),
          as_typescript: false,
        },
        ca_file: Some("example.crt".to_owned()),
        allow_net: true,
        allow_env: true,
        allow_run: true,
        allow_read: true,
        allow_write: true,
        allow_plugin: true,
        allow_hrtime: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn eval_with_inspect() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "eval",
      "--inspect",
      "const foo = 'bar'"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Eval {
          code: "const foo = 'bar'".to_string(),
          as_typescript: false,
        },
        inspect: Some("127.0.0.1:9229".parse().unwrap()),
        allow_net: true,
        allow_env: true,
        allow_run: true,
        allow_read: true,
        allow_write: true,
        allow_plugin: true,
        allow_hrtime: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn fetch_with_cafile() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "fetch",
      "--cert",
      "example.crt",
      "script.ts",
      "script_two.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Fetch {
          files: svec!["script.ts", "script_two.ts"],
        },
        ca_file: Some("example.crt".to_owned()),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn info_with_cafile() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "info",
      "--cert",
      "example.crt",
      "https://example.com"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Info {
          file: Some("https://example.com".to_string()),
        },
        ca_file: Some("example.crt".to_owned()),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn install_with_cafile() {
    let r = flags_from_vec_safe(svec![
      "deno",
      "install",
      "--cert",
      "example.crt",
      "deno_colors",
      "https://deno.land/std/examples/colors.ts"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Install {
          dir: None,
          exe_name: "deno_colors".to_string(),
          module_url: "https://deno.land/std/examples/colors.ts".to_string(),
          args: vec![],
          force: false,
        },
        ca_file: Some("example.crt".to_owned()),
        ..Flags::default()
      }
    );
  }

  #[test]
  fn repl_with_cafile() {
    let r = flags_from_vec_safe(svec!["deno", "repl", "--cert", "example.crt"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Repl {},
        ca_file: Some("example.crt".to_owned()),
        allow_read: true,
        allow_write: true,
        allow_net: true,
        allow_env: true,
        allow_run: true,
        allow_plugin: true,
        allow_hrtime: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn repl_with_inspect() {
    let r = flags_from_vec_safe(svec!["deno", "repl", "--inspect"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Repl {},
        inspect: Some("127.0.0.1:9229".parse().unwrap()),
        allow_read: true,
        allow_write: true,
        allow_net: true,
        allow_env: true,
        allow_run: true,
        allow_plugin: true,
        allow_hrtime: true,
        ..Flags::default()
      }
    );
  }

  #[test]
  fn doc() {
    let r =
      flags_from_vec_safe(svec!["deno", "doc", "--json", "path/to/module.ts"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Doc {
          json: true,
          source_file: "path/to/module.ts".to_string(),
          filter: None,
        },
        ..Flags::default()
      }
    );

    let r = flags_from_vec_safe(svec![
      "deno",
      "doc",
      "path/to/module.ts",
      "SomeClass.someField"
    ]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Doc {
          json: false,
          source_file: "path/to/module.ts".to_string(),
          filter: Some("SomeClass.someField".to_string()),
        },
        ..Flags::default()
      }
    );
  }

  #[test]
  fn inspect_default_host() {
    let r = flags_from_vec_safe(svec!["deno", "run", "--inspect", "foo.js"]);
    assert_eq!(
      r.unwrap(),
      Flags {
        subcommand: DenoSubcommand::Run {
          script: "foo.js".to_string(),
        },
        inspect: Some("127.0.0.1:9229".parse().unwrap()),
        ..Flags::default()
      }
    );
  }
}