Remove vendored dependencies

While it appears that by now we actually can get successful builds
without Cargo insisting on Internet access by virtue of using the
--frozen flag, maintaining vendored dependencies is somewhat of a pain
point. This state will also get worse with upcoming changes that replace
argparse in favor of structopt and pull in a slew of new dependencies by
doing so. Then there is also the repository structure aspect, which is
non-standard due to the way we vendor dependencies and a potential
source of confusion.
In order to fix these problems, this change removes all the vendored
dependencies we have.

Delete subrepo argparse/:argparse
Delete subrepo base32/:base32
Delete subrepo cc/:cc
Delete subrepo cfg-if/:cfg-if
Delete subrepo getrandom/:getrandom
Delete subrepo lazy-static/:lazy-static
Delete subrepo libc/:libc
Delete subrepo nitrokey-sys/:nitrokey-sys
Delete subrepo nitrokey/:nitrokey
Delete subrepo rand/:rand

1 files changed, 0 insertions, 967 deletions

diff --git a/argparse/src/parser.rs b/argparse/src/parser.rs
deleted file mode 100644
index ac7e3da..0000000
--- a/argparse/src/parser.rs
+++ /dev/null
@@ -1,967 +0,0 @@
-use std::env;
-use std::io::{Write};
-use std::io::Result as IoResult;
-use std::io::{stdout, stderr};
-use std::rc::Rc;
-use std::cell::RefCell;
-use std::iter::Peekable;
-use std::slice::Iter;
-use std::hash::Hash;
-use std::hash::Hasher;
-use std::str::FromStr;
-use std::process::exit;
-
-#[allow(unused_imports)] #[allow(deprecated)]
-use std::ascii::AsciiExt;
-
-use std::collections::HashMap;
-use std::collections::hash_map::Entry;
-use std::collections::HashSet;
-
-use super::action::{Action, ParseResult};
-use super::action::ParseResult::{Parsed, Help, Exit, Error};
-use super::action::TypedAction;
-use super::action::Action::{Flag, Single, Push, Many};
-use super::action::IArgAction;
-use super::generic::StoreAction;
-use super::help::{HelpAction, wrap_text};
-use action::IFlagAction;
-
-use self::ArgumentKind::{Positional, ShortOption, LongOption, Delimiter};
-
-
-static OPTION_WIDTH: usize = 24;
-static TOTAL_WIDTH: usize = 79;
-
-
-enum ArgumentKind {
-    Positional,
-    ShortOption,
-    LongOption,
-    Delimiter, // Barely "--"
-}
-
-
-impl ArgumentKind {
-    fn check(name: &str) -> ArgumentKind {
-        let mut iter = name.chars();
-        let char1 = iter.next();
-        let char2 = iter.next();
-        let char3 = iter.next();
-        return match char1 {
-            Some('-') => match char2 {
-                Some('-') => match char3 {
-                        Some(_) => LongOption, // --opt
-                        None => Delimiter,  // just --
-                },
-                Some(_) => ShortOption,  // -opts
-                None => Positional,  // single dash
-            },
-            Some(_) | None => Positional,
-        }
-    }
-}
-
-struct GenericArgument<'parser> {
-    id: usize,
-    varid: usize,
-    name: &'parser str,
-    help: &'parser str,
-    action: Action<'parser>,
-}
-
-struct GenericOption<'parser> {
-    id: usize,
-    varid: Option<usize>,
-    names: Vec<&'parser str>,
-    help: &'parser str,
-    action: Action<'parser>,
-}
-
-struct EnvVar<'parser> {
-    varid: usize,
-    name: &'parser str,
-    action: Box<IArgAction + 'parser>,
-}
-
-impl<'a> Hash for GenericOption<'a> {
-    fn hash<H>(&self, state: &mut H) where H: Hasher {
-        self.id.hash(state);
-    }
-}
-
-impl<'a> PartialEq for GenericOption<'a> {
-    fn eq(&self, other: &GenericOption<'a>) -> bool {
-        return self.id == other.id;
-    }
-}
-
-impl<'a> Eq for GenericOption<'a> {}
-
-impl<'a> Hash for GenericArgument<'a> {
-    fn hash<H>(&self, state: &mut H) where H: Hasher {
-        self.id.hash(state);
-    }
-}
-
-impl<'a> PartialEq for GenericArgument<'a> {
-    fn eq(&self, other: &GenericArgument<'a>) -> bool {
-        return self.id == other.id;
-    }
-}
-
-impl<'a> Eq for GenericArgument<'a> {}
-
-pub struct Var {
-    id: usize,
-    metavar: String,
-    required: bool,
-}
-
-impl Hash for Var {
-    fn hash<H>(&self, state: &mut H) where H: Hasher {
-        self.id.hash(state);
-    }
-}
-
-impl PartialEq for Var {
-    fn eq(&self, other: &Var) -> bool {
-        return self.id == other.id;
-    }
-}
-
-impl Eq for Var {}
-
-struct Context<'ctx, 'parser: 'ctx> {
-    parser: &'ctx ArgumentParser<'parser>,
-    set_vars: HashSet<usize>,
-    list_options: HashMap<Rc<GenericOption<'parser>>, Vec<&'ctx str>>,
-    list_arguments: HashMap<Rc<GenericArgument<'parser>>, Vec<&'ctx str>>,
-    arguments: Vec<&'ctx str>,
-    iter: Peekable<Iter<'ctx, String>>,
-    stderr: &'ctx mut (Write + 'ctx),
-}
-
-impl<'a, 'b> Context<'a, 'b> {
-
-    fn parse_option(&mut self, opt: Rc<GenericOption<'b>>,
-        optarg: Option<&'a str>)
-        -> ParseResult
-    {
-        let value = match optarg {
-            Some(value) => value,
-            None => match self.iter.next() {
-                Some(value) => {
-                    &value[..]
-                }
-                None => {
-                    return match opt.action {
-                        Many(_) => Parsed,
-                        _ => Error(format!(
-                            // TODO(tailhook) is {:?} ok?
-                            "Option {:?} requires an argument", opt.names)),
-                    };
-                }
-            },
-        };
-        match opt.varid {
-            Some(varid) => { self.set_vars.insert(varid); }
-            None => {}
-        }
-        match opt.action {
-            Single(ref action) => {
-                return action.parse_arg(value);
-            }
-            Push(_) => {
-                (match self.list_options.entry(opt.clone()) {
-                    Entry::Occupied(occ) => occ.into_mut(),
-                    Entry::Vacant(vac) => vac.insert(Vec::new()),
-                }).push(value);
-                return Parsed;
-            }
-            Many(_) => {
-                let vec = match self.list_options.entry(opt.clone()) {
-                    Entry::Occupied(occ) => occ.into_mut(),
-                    Entry::Vacant(vac) => vac.insert(Vec::new()),
-                };
-                vec.push(value);
-                match optarg {
-                    Some(_) => return Parsed,
-                    _ => {}
-                }
-                loop {
-                    match self.iter.peek() {
-                        None => { break; }
-                        Some(arg) if arg.starts_with("-") => {
-                            break;
-                        }
-                        Some(value) => {
-                            vec.push(&value[..]);
-                        }
-                    }
-                    self.iter.next();
-                }
-                return Parsed;
-            }
-            _ => panic!(),
-        };
-    }
-
-    fn parse_long_option(&mut self, arg: &'a str) -> ParseResult {
-        let mut equals_iter = arg.splitn(2, '=');
-        let optname = equals_iter.next().unwrap();
-        let valueref = equals_iter.next();
-        let opt = self.parser.long_options.get(&optname.to_string());
-        match opt {
-            Some(opt) => {
-                match opt.action {
-                    Flag(ref action) => {
-                        match valueref {
-                            Some(_) => {
-                                return Error(format!(
-                                    "Option {} does not accept an argument",
-                                    optname));
-                            }
-                            None => {
-                                match opt.varid {
-                                    Some(varid) => {
-                                        self.set_vars.insert(varid);
-                                    }
-                                    None => {}
-                                }
-                                return action.parse_flag();
-                            }
-                        }
-                    }
-                    Single(_) | Push(_) | Many(_) => {
-                        return self.parse_option(opt.clone(), valueref);
-                    }
-                }
-            }
-            None => {
-                return Error(format!("Unknown option {}", arg));
-            }
-        }
-    }
-
-    fn parse_short_options<'x>(&'x mut self, arg: &'a str) -> ParseResult {
-        let mut iter = arg.char_indices();
-        iter.next();
-        for (idx, ch) in iter {
-            let opt = match self.parser.short_options.get(&ch) {
-                Some(opt) => { opt }
-                None => {
-                    return Error(format!("Unknown short option \"{}\"", ch));
-                }
-            };
-            let res = match opt.action {
-                Flag(ref action) => {
-                    match opt.varid {
-                        Some(varid) => { self.set_vars.insert(varid); }
-                        None => {}
-                    }
-                    action.parse_flag()
-                }
-                Single(_) | Push(_) | Many(_) => {
-                    let value;
-                    if idx + 1 < arg.len() {
-                        value = Some(&arg[idx+1..arg.len()]);
-                    } else {
-                        value = None;
-                    }
-                    return self.parse_option(opt.clone(), value);
-                }
-            };
-            match res {
-                Parsed => { continue; }
-                x => { return x; }
-            }
-        }
-        return Parsed;
-    }
-
-    fn postpone_argument(&mut self, arg: &'a str) {
-        self.arguments.push(arg);
-    }
-
-    fn parse_options(&mut self) -> ParseResult {
-        self.iter.next();  // Command name
-        loop {
-            let next = self.iter.next();
-            let arg = match next {
-                Some(arg) => { arg }
-                None => { break; }
-            };
-            let res = match ArgumentKind::check(&arg[..]) {
-                Positional => {
-                    self.postpone_argument(&arg[..]);
-                    if self.parser.stop_on_first_argument {
-                        break;
-                    }
-                    continue;
-                }
-                LongOption => self.parse_long_option(&arg[..]),
-                ShortOption => self.parse_short_options(&arg[..]),
-                Delimiter => {
-                    if !self.parser.silence_double_dash {
-                        self.postpone_argument("--");
-                    }
-                    break;
-                }
-            };
-            match res {
-                Parsed => continue,
-                _ => return res,
-            }
-        }
-
-        loop {
-            match self.iter.next() {
-                None => break,
-                Some(arg) => self.postpone_argument(&arg[..]),
-            }
-        }
-        return Parsed;
-    }
-
-    fn parse_arguments(&mut self) -> ParseResult {
-        let mut pargs = self.parser.arguments.iter();
-        for arg in self.arguments.iter() {
-            let opt;
-            loop {
-                match pargs.next() {
-                    Some(option) => {
-                        if self.set_vars.contains(&option.varid) {
-                            continue;
-                        }
-                        opt = option;
-                        break;
-                    }
-                    None => match self.parser.catchall_argument {
-                        Some(ref option) => {
-                            opt = option;
-                            break;
-                        }
-                        None => return Error(format!(
-                            "Unexpected argument {}", arg)),
-                    }
-                };
-            }
-            let res = match opt.action {
-                Single(ref act) => {
-                    self.set_vars.insert(opt.varid);
-                    act.parse_arg(*arg)
-                },
-                Many(_) | Push(_) => {
-                    (match self.list_arguments.entry(opt.clone()) {
-                        Entry::Occupied(occ) => occ.into_mut(),
-                        Entry::Vacant(vac) => vac.insert(Vec::new()),
-                    }).push(*arg);
-                    Parsed
-                },
-                _ => unreachable!(),
-            };
-            match res {
-                Parsed => continue,
-                _ => return res,
-            }
-        }
-        return Parsed;
-    }
-
-    fn parse_list_vars(&mut self) -> ParseResult {
-        for (opt, lst) in self.list_options.iter() {
-            match opt.action {
-                Push(ref act) | Many(ref act) => {
-                    let res = act.parse_args(&lst[..]);
-                    match res {
-                        Parsed => continue,
-                        _ => return res,
-                    }
-                }
-                _ => panic!(),
-            }
-        }
-        for (opt, lst) in self.list_arguments.iter() {
-            match opt.action {
-                Push(ref act) | Many(ref act) => {
-                    let res = act.parse_args(&lst[..]);
-                    match res {
-                        Parsed => continue,
-                        _ => return res,
-                    }
-                }
-                _ => panic!(),
-            }
-        }
-        return Parsed;
-    }
-
-    fn parse_env_vars(&mut self) -> ParseResult {
-        for evar in self.parser.env_vars.iter() {
-            match env::var(evar.name) {
-                Ok(val) => {
-                    match evar.action.parse_arg(&val[..]) {
-                        Parsed => {
-                            self.set_vars.insert(evar.varid);
-                            continue;
-                        }
-                        Error(err) => {
-                            write!(self.stderr,
-                                "WARNING: Environment variable {}: {}\n",
-                                evar.name, err).ok();
-                        }
-                        _ => unreachable!(),
-                    }
-                }
-                Err(_) => {}
-            }
-        }
-        return Parsed;
-    }
-
-    fn check_required(&mut self) -> ParseResult {
-        // Check for required arguments
-        for var in self.parser.vars.iter() {
-            if var.required && !self.set_vars.contains(&var.id) {
-                // First try positional arguments
-                for opt in self.parser.arguments.iter() {
-                    if opt.varid == var.id {
-                        return Error(format!(
-                            "Argument {} is required", opt.name));
-                    }
-                }
-                // Then options
-                let mut all_options = vec!();
-                for opt in self.parser.options.iter() {
-                    match opt.varid {
-                        Some(varid) if varid == var.id => {}
-                        _ => { continue }
-                    }
-                    all_options.extend(opt.names.clone().into_iter());
-                }
-                if all_options.len() > 1 {
-                    return Error(format!(
-                        "One of the options {:?} is required", all_options));
-                } else if all_options.len() == 1 {
-                    return Error(format!(
-                        "Option {:?} is required", all_options));
-                }
-                // Then envvars
-                for envvar in self.parser.env_vars.iter() {
-                    if envvar.varid == var.id {
-                        return Error(format!(
-                            "Environment var {} is required", envvar.name));
-                    }
-                }
-            }
-        }
-        return Parsed;
-    }
-
-    fn parse(parser: &ArgumentParser, args: &Vec<String>, stderr: &mut Write)
-        -> ParseResult
-    {
-        let mut ctx = Context {
-            parser: parser,
-            iter: args.iter().peekable(),
-            set_vars: HashSet::new(),
-            list_options: HashMap::new(),
-            list_arguments: HashMap::new(),
-            arguments: Vec::new(),
-            stderr: stderr,
-        };
-
-        match ctx.parse_env_vars() {
-            Parsed => {}
-            x => { return x; }
-        }
-
-        match ctx.parse_options() {
-            Parsed => {}
-            x => { return x; }
-        }
-
-        match ctx.parse_arguments() {
-            Parsed => {}
-            x => { return x; }
-        }
-
-        match ctx.parse_list_vars() {
-            Parsed => {}
-            x => { return x; }
-        }
-
-        match ctx.check_required() {
-            Parsed => {}
-            x => { return x; }
-        }
-
-        return Parsed;
-    }
-}
-
-pub struct Ref<'parser:'refer, 'refer, T: 'parser> {
-    cell: Rc<RefCell<&'parser mut T>>,
-    varid: usize,
-    parser: &'refer mut ArgumentParser<'parser>,
-}
-
-impl<'parser, 'refer, T> Ref<'parser, 'refer, T> {
-
-    pub fn add_option<'x, A: TypedAction<T>>(&'x mut self,
-        names: &[&'parser str], action: A, help: &'parser str)
-        -> &'x mut Ref<'parser, 'refer, T>
-    {
-        {
-            let var = &mut self.parser.vars[self.varid];
-            if var.metavar.len() == 0 {
-                let mut longest_name = names[0];
-                let mut llen = longest_name.len();
-                for name in names.iter() {
-                    if name.len() > llen {
-                        longest_name = *name;
-                        llen = longest_name.len();
-                    }
-                }
-                if llen > 2 {
-                    var.metavar = longest_name[2..llen]
-                        .to_ascii_uppercase().replace("-", "_");
-                }
-            }
-        }
-        self.parser.add_option_for(Some(self.varid), names,
-            action.bind(self.cell.clone()),
-            help);
-        return self;
-    }
-
-    pub fn add_argument<'x, A: TypedAction<T>>(&'x mut self,
-        name: &'parser str, action: A, help: &'parser str)
-        -> &'x mut Ref<'parser, 'refer, T>
-    {
-        let act = action.bind(self.cell.clone());
-        let opt = Rc::new(GenericArgument {
-            id: self.parser.arguments.len(),
-            varid: self.varid,
-            name: name,
-            help: help,
-            action: act,
-            });
-        match opt.action {
-            Flag(_) => panic!("Flag arguments can't be positional"),
-            Many(_) | Push(_) => {
-                match self.parser.catchall_argument {
-                    Some(ref y) => panic!(format!(
-                        "Option {} conflicts with option {}",
-                        name, y.name)),
-                    None => {},
-                }
-                self.parser.catchall_argument = Some(opt);
-            }
-            Single(_) => {
-                self.parser.arguments.push(opt);
-            }
-        }
-        {
-            let var = &mut self.parser.vars[self.varid];
-            if var.metavar.len() == 0 {
-                var.metavar = name.to_string();
-            }
-        }
-        return self;
-    }
-
-    pub fn metavar<'x>(&'x mut self, name: &str)
-        -> &'x mut Ref<'parser, 'refer, T>
-    {
-        {
-            let var = &mut self.parser.vars[self.varid];
-            var.metavar = name.to_string();
-        }
-        return self;
-    }
-
-    pub fn required<'x>(&'x mut self)
-        -> &'x mut Ref<'parser, 'refer, T>
-    {
-        {
-            let var = &mut self.parser.vars[self.varid];
-            var.required = true;
-        }
-        return self;
-    }
-}
-
-impl<'parser, 'refer, T: 'static + FromStr> Ref<'parser, 'refer, T> {
-    pub fn envvar<'x>(&'x mut self, varname: &'parser str)
-        -> &'x mut Ref<'parser, 'refer, T>
-    {
-        self.parser.env_vars.push(Rc::new(EnvVar {
-            varid: self.varid,
-            name: varname,
-            action: Box::new(StoreAction { cell: self.cell.clone() }),
-            }));
-        return self;
-    }
-}
-
-/// The main argument parser class
-pub struct ArgumentParser<'parser> {
-    description: &'parser str,
-    vars: Vec<Box<Var>>,
-    options: Vec<Rc<GenericOption<'parser>>>,
-    arguments: Vec<Rc<GenericArgument<'parser>>>,
-    env_vars: Vec<Rc<EnvVar<'parser>>>,
-    catchall_argument: Option<Rc<GenericArgument<'parser>>>,
-    short_options: HashMap<char, Rc<GenericOption<'parser>>>,
-    long_options: HashMap<String, Rc<GenericOption<'parser>>>,
-    stop_on_first_argument: bool,
-    silence_double_dash: bool,
-}
-
-
-
-impl<'parser> ArgumentParser<'parser> {
-
-    /// Create an empty argument parser
-    pub fn new() -> ArgumentParser<'parser> {
-
-        let mut ap = ArgumentParser {
-            description: "",
-            vars: Vec::new(),
-            env_vars: Vec::new(),
-            arguments: Vec::new(),
-            catchall_argument: None,
-            options: Vec::new(),
-            short_options: HashMap::new(),
-            long_options: HashMap::new(),
-            stop_on_first_argument: false,
-            silence_double_dash: true,
-            };
-        ap.add_option_for(None, &["-h", "--help"], Flag(Box::new(HelpAction)),
-            "Show this help message and exit");
-        return ap;
-    }
-
-    /// Borrow mutable variable for an argument
-    ///
-    /// This returns `Ref` object which should be used configure the option
-    pub fn refer<'x, T>(&'x mut self, val: &'parser mut T)
-        -> Box<Ref<'parser, 'x, T>>
-    {
-        let cell = Rc::new(RefCell::new(val));
-        let id = self.vars.len();
-        self.vars.push(Box::new(Var {
-                id: id,
-                required: false,
-                metavar: "".to_string(),
-                }));
-        return Box::new(Ref {
-            cell: cell.clone(),
-            varid: id,
-            parser: self,
-        });
-    }
-
-    /// Add option to argument parser
-    ///
-    /// This is only useful for options that don't store value. For
-    /// example `Print(...)`
-    pub fn add_option<F:IFlagAction + 'parser>(&mut self,
-        names: &[&'parser str], action: F, help: &'parser str)
-    {
-        self.add_option_for(None, names, Flag(Box::new(action)), help);
-    }
-
-    /// Set description of the command
-    pub fn set_description(&mut self, descr: &'parser str) {
-        self.description = descr;
-    }
-
-    fn add_option_for(&mut self, var: Option<usize>,
-        names: &[&'parser str],
-        action: Action<'parser>, help: &'parser str)
-    {
-        let opt = Rc::new(GenericOption {
-            id: self.options.len(),
-            varid: var,
-            names: names.to_vec(),
-            help: help,
-            action: action,
-            });
-
-        if names.len() < 1 {
-            panic!("At least one name for option must be specified");
-        }
-        for nameptr in names.iter() {
-            let name = *nameptr;
-            match ArgumentKind::check(name) {
-                Positional|Delimiter => {
-                    panic!("Bad argument name {}", name);
-                }
-                LongOption => {
-                    self.long_options.insert(
-                        name.to_string(), opt.clone());
-                }
-                ShortOption => {
-                    if name.len() > 2 {
-                        panic!("Bad short argument {}", name);
-                    }
-                    self.short_options.insert(
-                        name.as_bytes()[1] as char, opt.clone());
-                }
-            }
-        }
-        self.options.push(opt);
-    }
-
-    /// Print help
-    ///
-    /// Usually command-line option is used for printing help,
-    /// this is here for any awkward cases
-    pub fn print_help(&self, name: &str, writer: &mut Write) -> IoResult<()> {
-        return HelpFormatter::print_help(self, name, writer);
-    }
-
-    /// Print usage
-    ///
-    /// Usually printed into stderr on error of command-line parsing
-    pub fn print_usage(&self, name: &str, writer: &mut Write) -> IoResult<()>
-    {
-        return HelpFormatter::print_usage(self, name, writer);
-    }
-
-    /// Parse arguments
-    ///
-    /// This is most powerful method. Usually you need `parse_args`
-    /// or `parse_args_or_exit` instead
-    pub fn parse(&self, args: Vec<String>,
-        stdout: &mut Write, stderr: &mut Write)
-        -> Result<(), i32>
-    {
-        let name = if args.len() > 0 { &args[0][..] } else { "unknown" };
-        match Context::parse(self, &args, stderr) {
-            Parsed => return Ok(()),
-            Exit => return Err(0),
-            Help => {
-                self.print_help(name, stdout).unwrap();
-                return Err(0);
-            }
-            Error(message) => {
-                self.error(&name[..], &message[..], stderr);
-                return Err(2);
-            }
-        }
-    }
-
-    /// Write an error similar to one produced by the library itself
-    ///
-    /// Only needed if you like to do some argument validation that is out
-    /// of scope of the argparse
-    pub fn error(&self, command: &str, message: &str, writer: &mut Write) {
-        self.print_usage(command, writer).unwrap();
-        write!(writer, "{}: {}\n", command, message).ok();
-    }
-
-    /// Configure parser to ignore options when first non-option argument is
-    /// encountered.
-    ///
-    /// Useful for commands that want to pass following options to the
-    /// subcommand or subprocess, but need some options to be set before
-    /// command is specified.
-    pub fn stop_on_first_argument(&mut self, want_stop: bool) {
-        self.stop_on_first_argument = want_stop;
-    }
-
-    /// Do not put double-dash (bare `--`) into argument
-    ///
-    /// The double-dash is used to stop parsing options and treat all the
-    /// following tokens as the arguments regardless of whether they start
-    /// with dash (minus) or not.
-    ///
-    /// The method only useful for `List` arguments. On by default. The method
-    /// allows to set option to `false` so that `cmd xx -- yy` will get
-    /// ``xx -- yy`` as arguments instead of ``xx yy`` by default. This is
-    /// useful if your ``--`` argument is meaningful. Only first double-dash
-    /// is ignored by default.
-    pub fn silence_double_dash(&mut self, silence: bool) {
-        self.silence_double_dash = silence;
-    }
-
-    /// Convenience method to parse arguments
-    ///
-    /// On error returns error code that is supposed to be returned by
-    /// an application. (i.e. zero on `--help` and `2` on argument error)
-    pub fn parse_args(&self) -> Result<(), i32> {
-        // TODO(tailhook) can we get rid of collect?
-        return self.parse(env::args().collect(),
-            &mut stdout(), &mut stderr());
-    }
-
-    /// The simplest conveninece method
-    ///
-    /// The method returns only in case of successful parsing or exits with
-    /// appropriate code (including successful on `--help`) otherwise.
-    pub fn parse_args_or_exit(&self) {
-        // TODO(tailhook) can we get rid of collect?
-        self.parse(env::args().collect(), &mut stdout(), &mut stderr())
-            .map_err(|c| exit(c))
-            .ok();
-    }
-}
-
-struct HelpFormatter<'a, 'b: 'a> {
-    name: &'a str,
-    parser: &'a ArgumentParser<'b>,
-    buf: &'a mut (Write + 'a),
-}
-
-impl<'a, 'b> HelpFormatter<'a, 'b> {
-    pub fn print_usage(parser: &ArgumentParser, name: &str, writer: &mut Write)
-        -> IoResult<()>
-    {
-        return HelpFormatter { parser: parser, name: name, buf: writer }
-            .write_usage();
-    }
-
-    pub fn print_help(parser: &ArgumentParser, name: &str, writer: &mut Write)
-        -> IoResult<()>
-    {
-        return HelpFormatter { parser: parser, name: name, buf: writer }
-            .write_help();
-    }
-
-    pub fn print_argument(&mut self, arg: &GenericArgument<'b>)
-        -> IoResult<()>
-    {
-        let mut num = 2;
-        try!(write!(self.buf, "  {}", arg.name));
-        num += arg.name.len();
-        if num >= OPTION_WIDTH {
-            try!(write!(self.buf, "\n"));
-            for _ in 0..OPTION_WIDTH {
-                try!(write!(self.buf, " "));
-            }
-        } else {
-            for _ in num..OPTION_WIDTH {
-                try!(write!(self.buf, " "));
-            }
-        }
-        try!(wrap_text(self.buf, arg.help, TOTAL_WIDTH, OPTION_WIDTH));
-        try!(write!(self.buf, "\n"));
-        return Ok(());
-    }
-
-    pub fn print_option(&mut self, opt: &GenericOption<'b>) -> IoResult<()> {
-        let mut num = 2;
-        try!(write!(self.buf, "  "));
-        let mut niter = opt.names.iter();
-        let name = niter.next().unwrap();
-        try!(write!(self.buf, "{}", name));
-        num += name.len();
-        for name in niter {
-            try!(write!(self.buf, ","));
-            try!(write!(self.buf, "{}", name));
-            num += name.len() + 1;
-        }
-        match opt.action {
-            Flag(_) => {}
-            Single(_) | Push(_) | Many(_) => {
-                try!(write!(self.buf, " "));
-                let var = &self.parser.vars[opt.varid.unwrap()];
-                try!(write!(self.buf, "{}", &var.metavar[..]));
-                num += var.metavar.len() + 1;
-            }
-        }
-        if num >= OPTION_WIDTH {
-            try!(write!(self.buf, "\n"));
-            for _ in 0..OPTION_WIDTH {
-                try!(write!(self.buf, " "));
-            }
-        } else {
-            for _ in num..OPTION_WIDTH {
-                try!(write!(self.buf, " "));
-            }
-        }
-        try!(wrap_text(self.buf, opt.help, TOTAL_WIDTH, OPTION_WIDTH));
-        try!(write!(self.buf, "\n"));
-        return Ok(());
-    }
-
-    fn write_help(&mut self) -> IoResult<()> {
-        try!(self.write_usage());
-        try!(write!(self.buf, "\n"));
-        if self.parser.description.len() > 0 {
-            try!(wrap_text(self.buf, self.parser.description,TOTAL_WIDTH, 0));
-            try!(write!(self.buf, "\n"));
-        }
-        if self.parser.arguments.len() > 0
-            || self.parser.catchall_argument.is_some()
-        {
-            try!(write!(self.buf, "\nPositional arguments:\n"));
-            for arg in self.parser.arguments.iter() {
-                try!(self.print_argument(&**arg));
-            }
-            match self.parser.catchall_argument {
-                Some(ref opt) => {
-                    try!(self.print_argument(&**opt));
-                }
-                None => {}
-            }
-        }
-        if self.parser.short_options.len() > 0
-            || self.parser.long_options.len() > 0
-        {
-            try!(write!(self.buf, "\nOptional arguments:\n"));
-            for opt in self.parser.options.iter() {
-                try!(self.print_option(&**opt));
-            }
-        }
-        return Ok(());
-    }
-
-    fn write_usage(&mut self) -> IoResult<()> {
-        try!(write!(self.buf, "Usage:\n  "));
-        try!(write!(self.buf, "{}", self.name));
-        if self.parser.options.len() != 0 {
-            if self.parser.short_options.len() > 1
-                || self.parser.long_options.len() > 1
-            {
-                try!(write!(self.buf, " [OPTIONS]"));
-            }
-            for opt in self.parser.arguments.iter() {
-                let var = &self.parser.vars[opt.varid];
-                try!(write!(self.buf, " "));
-                if !var.required {
-                    try!(write!(self.buf, "["));
-                }
-                try!(write!(self.buf, "{}",
-                    &opt.name.to_ascii_uppercase()[..]));
-                if !var.required {
-                    try!(write!(self.buf, "]"));
-                }
-            }
-            match self.parser.catchall_argument {
-                Some(ref opt) => {
-                    let var = &self.parser.vars[opt.varid];
-                    try!(write!(self.buf, " "));
-                    if !var.required {
-                        try!(write!(self.buf, "["));
-                    }
-                    try!(write!(self.buf, "{}",
-                        &opt.name.to_ascii_uppercase()[..]));
-                    if !var.required {
-                        try!(write!(self.buf, " ...]"));
-                    } else {
-                        try!(write!(self.buf, " [...]"));
-                    }
-                }
-                None => {}
-            }
-        }
-        try!(write!(self.buf, "\n"));
-        return Ok(());
-    }
-
-}