openethereum/parity/cli/usage.rs

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// Copyright 2015-2018 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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macro_rules! println_stderr(
($($arg:tt)*) => { {
let r = writeln!(&mut ::std::io::stderr(), $($arg)*);
r.expect("failed printing to stderr");
} }
);
macro_rules! return_if_parse_error {
($e:expr) => (
match $e {
Err(clap_error @ ClapError { kind: ClapErrorKind::ValueValidation, .. }) => {
return Err(clap_error);
},
// Otherwise, if $e is ClapErrorKind::ArgumentNotFound or Ok(),
// then convert to Option
_ => $e.ok()
}
)
}
macro_rules! if_option {
(Option<$type:ty>, THEN {$($then:tt)*} ELSE {$($otherwise:tt)*}) => (
$($then)*
);
($type:ty, THEN {$($then:tt)*} ELSE {$($otherwise:tt)*}) => (
$($otherwise)*
);
}
macro_rules! if_vec {
(Vec<$type:ty>, THEN {$($then:tt)*} ELSE {$($otherwise:tt)*}) => (
$($then)*
);
($type:ty, THEN {$($then:tt)*} ELSE {$($otherwise:tt)*}) => (
$($otherwise)*
);
}
macro_rules! if_option_vec {
(Option<Vec<String>>, THEN {$then:expr} ELSE {$otherwise:expr}) => (
$then
);
(Option<$type:ty>, THEN {$then:expr} ELSE {$otherwise:expr}) => (
$otherwise
);
}
macro_rules! inner_option_type {
(Option<$type:ty>) => (
$type
)
}
macro_rules! inner_vec_type {
(Vec<$type:ty>) => (
$type
)
}
macro_rules! inner_option_vec_type {
(Option<Vec<String>>) => (
String
)
}
macro_rules! usage_with_ident {
($name:expr, $usage:expr, $help:expr) => (
if $usage.contains("<") {
format!("<{}> {} '{}'",$name, $usage, $help)
} else {
format!("[{}] {} '{}'",$name, $usage, $help)
}
);
}
macro_rules! underscore_to_hyphen {
($e:expr) => (
str::replace($e, "_", "-")
)
}
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macro_rules! usage {
(
{
$(
CMD $subc:ident
{
$subc_help:expr,
$(
CMD $subc_subc:ident
{
$subc_subc_help:expr,
$(
FLAG $subc_subc_flag:ident : (bool) = false, $subc_subc_flag_usage:expr, $subc_subc_flag_help:expr,
)*
$(
ARG $subc_subc_arg:ident : ($($subc_subc_arg_type_tt:tt)+) = $subc_subc_arg_default:expr, $subc_subc_arg_usage:expr, $subc_subc_arg_help:expr,
)*
}
)*
$(
FLAG $subc_flag:ident : (bool) = false, $subc_flag_usage:expr, $subc_flag_help:expr,
)*
$(
ARG $subc_arg:ident : ($($subc_arg_type_tt:tt)+) = $subc_arg_default:expr, $subc_arg_usage:expr, $subc_arg_help:expr,
)*
}
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)*
}
{
$(
[$group_name:expr]
$(
FLAG $flag:ident : (bool) = false, or $flag_from_config:expr, $flag_usage:expr, $flag_help:expr,
)*
$(
ARG $arg:ident : ($($arg_type_tt:tt)+) = $arg_default:expr, or $arg_from_config:expr, $arg_usage:expr, $arg_help:expr,
)*
)*
}
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) => {
use toml;
use std::{fs, io, process, cmp};
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use std::io::{Read, Write};
use parity_version::version;
use clap::{Arg, App, SubCommand, AppSettings, ArgSettings, Error as ClapError, ErrorKind as ClapErrorKind};
use dir::helpers::replace_home;
use std::ffi::OsStr;
use std::collections::HashMap;
extern crate textwrap;
extern crate term_size;
use self::textwrap::{Wrapper};
const MAX_TERM_WIDTH: usize = 120;
#[cfg(test)]
use regex::Regex;
#[derive(Debug)]
pub enum ArgsError {
Clap(ClapError),
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Decode(toml::de::Error),
Config(String, io::Error),
PeerConfiguration,
}
impl ArgsError {
pub fn exit(self) -> ! {
match self {
ArgsError::Clap(e) => e.exit(),
ArgsError::Decode(e) => {
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println_stderr!("You might have supplied invalid parameters in config file.");
println_stderr!("{}", e);
process::exit(2)
},
ArgsError::Config(path, e) => {
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println_stderr!("There was an error reading your config file at: {}", path);
println_stderr!("{}", e);
process::exit(2)
},
ArgsError::PeerConfiguration => {
println_stderr!("You have supplied `min_peers` > `max_peers`");
process::exit(2)
}
}
}
}
impl From<ClapError> for ArgsError {
fn from(e: ClapError) -> Self {
ArgsError::Clap(e)
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}
}
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impl From<toml::de::Error> for ArgsError {
fn from(e: toml::de::Error) -> Self {
ArgsError::Decode(e)
}
}
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/// Parsed command line arguments.
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#[derive(Debug, PartialEq)]
pub struct Args {
$(
pub $subc: bool,
$(
pub $subc_subc: bool,
$(
pub $subc_subc_flag: bool,
)*
$(
pub $subc_subc_arg: $($subc_subc_arg_type_tt)+,
)*
)*
$(
pub $subc_flag: bool,
)*
$(
pub $subc_arg: $($subc_arg_type_tt)+,
)*
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)*
$(
$(
pub $flag: bool,
)*
$(
pub $arg: $($arg_type_tt)+,
)*
)*
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}
impl Default for Args {
fn default() -> Self {
Args {
$(
$subc: Default::default(),
$(
$subc_subc: Default::default(),
$(
$subc_subc_flag: Default::default(),
)*
$(
$subc_subc_arg: Default::default(),
)*
)*
$(
$subc_flag: Default::default(),
)*
$(
$subc_arg: Default::default(),
)*
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)*
$(
$(
$flag: Default::default(),
)*
$(
$arg: Default::default(),
)*
)*
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}
}
}
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#[derive(Default, Debug, PartialEq, Clone, Deserialize)]
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struct RawArgs {
$(
$subc: bool,
$(
$subc_subc: bool,
$(
$subc_subc_flag: bool,
)*
$(
$subc_subc_arg: if_option!(
$($subc_subc_arg_type_tt)+,
THEN { $($subc_subc_arg_type_tt)+ }
ELSE { Option<$($subc_subc_arg_type_tt)+> }
),
)*
)*
$(
$subc_flag: bool,
)*
$(
$subc_arg: if_option!(
$($subc_arg_type_tt)+,
THEN { $($subc_arg_type_tt)+ }
ELSE { Option<$($subc_arg_type_tt)+> }
),
)*
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)*
$(
$(
$flag: bool,
)*
$(
$arg: if_option!(
$($arg_type_tt)+,
THEN { $($arg_type_tt)+ }
ELSE { Option<$($arg_type_tt)+> }
),
)*
)*
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}
impl Args {
pub fn parse<S: AsRef<str>>(command: &[S]) -> Result<Self, ArgsError> {
let raw_args = RawArgs::parse(command)?;
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if let (Some(max_peers), Some(min_peers)) = (raw_args.arg_max_peers, raw_args.arg_min_peers) {
// Invalid configuration pattern `mix_peers` > `max_peers`
if min_peers > max_peers {
return Err(ArgsError::PeerConfiguration);
}
}
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// Skip loading config file if no_config flag is specified
if raw_args.flag_no_config {
return Ok(raw_args.into_args(Config::default()));
}
let config_file = raw_args.arg_config.clone().unwrap_or_else(|| raw_args.clone().into_args(Config::default()).arg_config);
let config_file = replace_home(&::dir::default_data_path(), &config_file);
match (fs::File::open(&config_file), raw_args.arg_config.clone()) {
// Load config file
(Ok(mut file), _) => {
println_stderr!("Loading config file from {}", &config_file);
let mut config = String::new();
file.read_to_string(&mut config).map_err(|e| ArgsError::Config(config_file, e))?;
Ok(raw_args.into_args(Self::parse_config(&config)?))
},
// Don't display error in case default config cannot be loaded.
(Err(_), None) => Ok(raw_args.into_args(Config::default())),
// Config set from CLI (fail with error)
(Err(_), Some(ref config_arg)) => {
match presets::preset_config_string(config_arg) {
Ok(s) => Ok(raw_args.into_args(Self::parse_config(&s)?)),
Err(e) => Err(ArgsError::Config(config_file, e))
}
},
}
}
#[cfg(test)]
pub fn parse_without_config<S: AsRef<str>>(command: &[S]) -> Result<Self, ArgsError> {
Self::parse_with_config(command, Config::default())
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}
#[cfg(test)]
fn parse_with_config<S: AsRef<str>>(command: &[S], config: Config) -> Result<Self, ArgsError> {
RawArgs::parse(command).map(|raw| raw.into_args(config)).map_err(ArgsError::Clap)
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}
fn parse_config(config: &str) -> Result<Config, ArgsError> {
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Ok(toml::from_str(config)?)
}
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pub fn print_version() -> String {
format!(include_str!("./version.txt"), version())
}
#[allow(unused_mut)] // subc_subc_exist may be assigned true by the macro
#[allow(unused_assignments)] // Rust issue #22630
pub fn print_help() -> String {
const TAB: &str = " ";
const TAB_TAB: &str = " ";
let term_width = match term_size::dimensions() {
None => MAX_TERM_WIDTH,
Some((w, _)) => {
cmp::min(w, MAX_TERM_WIDTH)
}
};
let mut help : String = include_str!("./usage_header.txt").to_owned();
help.push_str("\n");
// Subcommands
let mut subcommands_wrapper = Wrapper::new(term_width).subsequent_indent(TAB);
help.push_str("parity [options]\n");
$(
{
let mut subc_subc_exist = false;
$(
subc_subc_exist = true;
let subc_subc_usages : Vec<&str> = vec![
$(
concat!("[",$subc_subc_flag_usage,"]"),
)*
$(
$subc_subc_arg_usage,
)*
];
help.push_str(&subcommands_wrapper.fill(
format!(
"parity [options] {} {} {}\n",
underscore_to_hyphen!(&stringify!($subc)[4..]),
underscore_to_hyphen!(&stringify!($subc_subc)[stringify!($subc).len()+1..]),
subc_subc_usages.join(" ")
).as_ref())
);
)*
// Print the subcommand on its own only if it has no subsubcommands
if !subc_subc_exist {
let subc_usages : Vec<&str> = vec![
$(
concat!("[",$subc_flag_usage,"]"),
)*
$(
$subc_arg_usage,
)*
];
help.push_str(&subcommands_wrapper.fill(
format!(
"parity [options] {} {}\n",
underscore_to_hyphen!(&stringify!($subc)[4..]),
subc_usages.join(" ")
).as_ref())
);
}
}
)*
help.push_str("\n");
// Arguments and flags
let args_wrapper = Wrapper::new(term_width).initial_indent(TAB_TAB).subsequent_indent(TAB_TAB);
$(
if $group_name != "Legacy Options" {
help.push_str($group_name); help.push_str(":\n");
$(
help.push_str(&format!("{}{}\n{}\n",
TAB, $flag_usage,
args_wrapper.fill($flag_help)
));
help.push_str("\n");
)*
$(
if_option!(
$($arg_type_tt)+,
THEN {
if_option_vec!(
$($arg_type_tt)+,
THEN {
help.push_str(&format!("{}{}\n{}\n",
TAB, $arg_usage,
args_wrapper.fill(format!(
"{} (default: {:?})",
$arg_help,
{let x : inner_option_type!($($arg_type_tt)+)> = $arg_default; x}
).as_ref())
))
}
ELSE {
help.push_str(&format!("{}{}\n{}\n",
TAB, $arg_usage,
args_wrapper.fill(format!(
"{}{}",
$arg_help,
$arg_default.map(|x: inner_option_type!($($arg_type_tt)+)| format!(" (default: {})",x)).unwrap_or("".to_owned())
).as_ref())
))
}
)
}
ELSE {
if_vec!(
$($arg_type_tt)+,
THEN {
help.push_str(&format!("{}{}\n{}\n", TAB, $arg_usage,
args_wrapper.fill(format!(
"{} (default: {:?})",
$arg_help,
{let x : $($arg_type_tt)+ = $arg_default; x}
).as_ref())
))
}
ELSE {
help.push_str(&format!("{}{}\n{}\n", TAB, $arg_usage,
args_wrapper.fill(format!(
"{} (default: {})",
$arg_help,
$arg_default
).as_ref())
))
}
)
}
);
help.push_str("\n");
)*
}
)*
help
}
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}
impl RawArgs {
fn into_args(self, config: Config) -> Args {
let mut args = Args::default();
$(
args.$subc = self.$subc;
$(
args.$subc_subc = self.$subc_subc;
$(
args.$subc_subc_flag = self.$subc_subc_flag;
)*
$(
args.$subc_subc_arg = if_option!(
$($subc_subc_arg_type_tt)+,
THEN { self.$subc_subc_arg.or($subc_subc_arg_default) }
ELSE { self.$subc_subc_arg.unwrap_or($subc_subc_arg_default.into()) }
);
)*
)*
$(
args.$subc_flag = self.$subc_flag;
)*
$(
args.$subc_arg = if_option!(
$($subc_arg_type_tt)+,
THEN { self.$subc_arg.or($subc_arg_default) }
ELSE { self.$subc_arg.unwrap_or($subc_arg_default.into()) }
);
)*
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)*
$(
$(
args.$flag = self.$flag || $flag_from_config(&config).unwrap_or(false);
)*
$(
args.$arg = if_option!(
$($arg_type_tt)+,
THEN { self.$arg.or_else(|| $arg_from_config(&config)).or_else(|| $arg_default.into()) }
ELSE { self.$arg.or_else(|| $arg_from_config(&config)).unwrap_or_else(|| $arg_default.into()) }
);
)*
)*
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args
}
#[allow(unused_variables)] // the submatches of arg-less subcommands aren't used
pub fn parse<S: AsRef<str>>(command: &[S]) -> Result<Self, ClapError> {
let usages = vec![
$(
$(
usage_with_ident!(stringify!($arg), $arg_usage, $arg_help),
)*
$(
usage_with_ident!(stringify!($flag), $flag_usage, $flag_help),
)*
)*
];
// Hash of subc|subc_subc => Vec<String>
let mut subc_usages = HashMap::new();
$(
{
let this_subc_usages = vec![
$(
usage_with_ident!(stringify!($subc_flag), $subc_flag_usage, $subc_flag_help),
)*
$(
usage_with_ident!(stringify!($subc_arg), $subc_arg_usage, $subc_arg_help),
)*
];
subc_usages.insert(stringify!($subc),this_subc_usages);
$(
{
let this_subc_subc_usages = vec![
$(
usage_with_ident!(stringify!($subc_subc_flag), $subc_subc_flag_usage, $subc_subc_flag_help),
)*
$(
usage_with_ident!(stringify!($subc_subc_arg), $subc_subc_arg_usage, $subc_subc_arg_help),
)*
];
subc_usages.insert(stringify!($subc_subc), this_subc_subc_usages);
}
)*
}
)*
let matches = App::new("Parity")
.global_setting(AppSettings::VersionlessSubcommands)
.global_setting(AppSettings::DisableHelpSubcommand)
.max_term_width(MAX_TERM_WIDTH)
.help(Args::print_help().as_ref())
.args(&usages.iter().map(|u| {
let mut arg = Arg::from_usage(u)
.allow_hyphen_values(true) // Allow for example --allow-ips -10.0.0.0/8
.global(true) // Argument doesn't have to come before the first subcommand
.hidden(true); // Hide global arguments from the (subcommand) help messages generated by Clap
if arg.is_set(ArgSettings::Multiple) {
arg = arg.require_delimiter(true); // Multiple values can only be separated by commas, not spaces (#7428)
}
arg
}).collect::<Vec<Arg>>())
$(
.subcommand(
SubCommand::with_name(&underscore_to_hyphen!(&stringify!($subc)[4..]))
.about($subc_help)
.args(&subc_usages.get(stringify!($subc)).unwrap().iter().map(|u| Arg::from_usage(u).use_delimiter(false).allow_hyphen_values(true)).collect::<Vec<Arg>>())
$(
.setting(AppSettings::SubcommandRequired) // prevent from running `parity account`
.subcommand(
SubCommand::with_name(&underscore_to_hyphen!(&stringify!($subc_subc)[stringify!($subc).len()+1..]))
.about($subc_subc_help)
.args(&subc_usages.get(stringify!($subc_subc)).unwrap().iter().map(|u| Arg::from_usage(u).use_delimiter(false).allow_hyphen_values(true)).collect::<Vec<Arg>>())
)
)*
)
)*
.get_matches_from_safe(command.iter().map(|x| OsStr::new(x.as_ref())))?;
let mut raw_args : RawArgs = Default::default();
// Globals
$(
$(
raw_args.$flag = raw_args.$flag || matches.is_present(stringify!($flag));
)*
$(
if let some @ Some(_) = return_if_parse_error!(if_option!(
$($arg_type_tt)+,
THEN {
if_option_vec!(
$($arg_type_tt)+,
THEN { values_t!(matches, stringify!($arg), inner_option_vec_type!($($arg_type_tt)+)) }
ELSE { value_t!(matches, stringify!($arg), inner_option_type!($($arg_type_tt)+)) }
)
}
ELSE {
if_vec!(
$($arg_type_tt)+,
THEN { values_t!(matches, stringify!($arg), inner_vec_type!($($arg_type_tt)+)) }
ELSE { value_t!(matches, stringify!($arg), $($arg_type_tt)+) }
)
}
)) {
raw_args.$arg = some;
}
)*
)*
// Subcommands
$(
if let Some(submatches) = matches.subcommand_matches(&underscore_to_hyphen!(&stringify!($subc)[4..])) {
raw_args.$subc = true;
// Subcommand flags
$(
raw_args.$subc_flag = submatches.is_present(&stringify!($subc_flag));
)*
// Subcommand arguments
$(
raw_args.$subc_arg = return_if_parse_error!(if_option!(
$($subc_arg_type_tt)+,
THEN {
if_option_vec!(
$($subc_arg_type_tt)+,
THEN { values_t!(submatches, stringify!($subc_arg), inner_option_vec_type!($($subc_arg_type_tt)+)) }
ELSE { value_t!(submatches, stringify!($subc_arg), inner_option_type!($($subc_arg_type_tt)+)) }
)
}
ELSE {
if_vec!(
$($subc_arg_type_tt)+,
THEN { values_t!(submatches, stringify!($subc_arg), inner_vec_type!($($subc_arg_type_tt)+)) }
ELSE { value_t!(submatches, stringify!($subc_arg), $($subc_arg_type_tt)+) }
)
}
));
)*
// Sub-subcommands
$(
if let Some(subsubmatches) = submatches.subcommand_matches(&underscore_to_hyphen!(&stringify!($subc_subc)[stringify!($subc).len()+1..])) {
raw_args.$subc_subc = true;
// Sub-subcommand flags
$(
raw_args.$subc_subc_flag = subsubmatches.is_present(&stringify!($subc_subc_flag));
)*
// Sub-subcommand arguments
$(
raw_args.$subc_subc_arg = return_if_parse_error!(if_option!(
$($subc_subc_arg_type_tt)+,
THEN {
if_option_vec!(
$($subc_subc_arg_type_tt)+,
THEN { values_t!(subsubmatches, stringify!($subc_subc_arg), inner_option_vec_type!($($subc_subc_arg_type_tt)+)) }
ELSE { value_t!(subsubmatches, stringify!($subc_subc_arg), inner_option_type!($($subc_subc_arg_type_tt)+)) }
)
}
ELSE {
if_vec!(
$($subc_subc_arg_type_tt)+,
THEN { values_t!(subsubmatches, stringify!($subc_subc_arg), inner_vec_type!($($subc_subc_arg_type_tt)+)) }
ELSE { value_t!(subsubmatches, stringify!($subc_subc_arg), $($subc_subc_arg_type_tt)+) }
)
}
));
)*
}
else {
raw_args.$subc_subc = false;
}
)*
}
else {
raw_args.$subc = false;
}
)*
Ok(raw_args)
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}
}
#[test]
fn usages_valid() {
let re = Regex::new(r"^(?:(-[a-zA-Z-]+, )?--[a-z-]+(=\[[a-zA-Z]+\](\.\.\.)?|=<[a-zA-Z]+>(\.\.\.)?)?)|(?:\[[a-zA-Z-]+\])(\.\.\.)?|(?:<[a-zA-Z-]+>)(\.\.\.)?$").unwrap();
let usages = vec![
$(
$(
$(
$subc_subc_arg_usage,
)*
)*
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$(
$subc_arg_usage,
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)*
)*
$(
$(
$flag_usage,
)*
$(
$arg_usage,
)*
)*
];
for usage in &usages {
assert!(re.is_match(usage));
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}
}
}
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}