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/// A convenience macro for loading the YAML file at compile time (relative to the current file,
/// like modules work). That YAML object can then be passed to this function.
///
/// # Panics
///
/// The YAML file must be properly formatted or this function will panic!(). A good way to
/// ensure this doesn't happen is to run your program with the `--help` switch. If this passes
/// without error, you needn't worry because the YAML is properly formatted.
///
/// # Examples
///
/// The following example shows how to load a properly formatted YAML file to build an instance
/// of an `App` struct.
///
/// ```ignore
/// # #[macro_use]
/// # extern crate clap;
/// # use clap::App;
/// # fn main() {
/// let yml = load_yaml!("app.yml");
/// let app = App::from_yaml(yml);
///
/// // continued logic goes here, such as `app.get_matches()` etc.
/// # }
/// ```
#[cfg(feature = "yaml")]
#[macro_export]
macro_rules! load_yaml {
($yml:expr) => {
&::clap::YamlLoader::load_from_str(include_str!($yml)).expect("failed to load YAML file")[0]
};
}
/// Convenience macro getting a typed value `T` where `T` implements [`std::str::FromStr`] from an
/// argument value. This macro returns a `Result<T,String>` which allows you as the developer to
/// decide what you'd like to do on a failed parse. There are two types of errors, parse failures
/// and those where the argument wasn't present (such as a non-required argument). You can use
/// it to get a single value, or a iterator as with the [`ArgMatches::values_of`]
///
/// # Examples
///
/// ```no_run
/// # #[macro_use]
/// # extern crate clap;
/// # use clap::App;
/// # fn main() {
/// let matches = App::new("myapp")
/// .arg_from_usage("[length] 'Set the length to use as a pos whole num, i.e. 20'")
/// .get_matches();
///
/// let len = value_t!(matches.value_of("length"), u32).unwrap_or_else(|e| e.exit());
/// let also_len = value_t!(matches, "length", u32).unwrap_or_else(|e| e.exit());
///
/// println!("{} + 2: {}", len, len + 2);
/// # }
/// ```
/// [`std::str::FromStr`]: https://doc.rust-lang.org/std/str/trait.FromStr.html
/// [`ArgMatches::values_of`]: ./struct.ArgMatches.html#method.values_of
/// [`Result<T,String>`]: https://doc.rust-lang.org/std/result/enum.Result.html
#[macro_export]
macro_rules! value_t {
($m:ident, $v:expr, $t:ty) => {
value_t!($m.value_of($v), $t)
};
($m:ident.value_of($v:expr), $t:ty) => {
if let Some(v) = $m.value_of($v) {
match v.parse::<$t>() {
Ok(val) => Ok(val),
Err(_) => Err(::clap::Error::value_validation_auto(format!(
"The argument '{}' isn't a valid value",
v
))),
}
} else {
Err(::clap::Error::argument_not_found_auto($v))
}
};
}
/// Convenience macro getting a typed value `T` where `T` implements [`std::str::FromStr`] or
/// exiting upon error, instead of returning a [`Result`] type.
///
/// **NOTE:** This macro is for backwards compatibility sake. Prefer
/// [`value_t!(/* ... */).unwrap_or_else(|e| e.exit())`]
///
/// # Examples
///
/// ```no_run
/// # #[macro_use]
/// # extern crate clap;
/// # use clap::App;
/// # fn main() {
/// let matches = App::new("myapp")
/// .arg_from_usage("[length] 'Set the length to use as a pos whole num, i.e. 20'")
/// .get_matches();
///
/// let len = value_t_or_exit!(matches.value_of("length"), u32);
/// let also_len = value_t_or_exit!(matches, "length", u32);
///
/// println!("{} + 2: {}", len, len + 2);
/// # }
/// ```
/// [`std::str::FromStr`]: https://doc.rust-lang.org/std/str/trait.FromStr.html
/// [`Result`]: https://doc.rust-lang.org/std/result/enum.Result.html
/// [`value_t!(/* ... */).unwrap_or_else(|e| e.exit())`]: ./macro.value_t!.html
#[macro_export]
macro_rules! value_t_or_exit {
($m:ident, $v:expr, $t:ty) => {
value_t_or_exit!($m.value_of($v), $t)
};
($m:ident.value_of($v:expr), $t:ty) => {
if let Some(v) = $m.value_of($v) {
match v.parse::<$t>() {
Ok(val) => val,
Err(_) => ::clap::Error::value_validation_auto(format!(
"The argument '{}' isn't a valid value",
v
))
.exit(),
}
} else {
::clap::Error::argument_not_found_auto($v).exit()
}
};
}
/// Convenience macro getting a typed value [`Vec<T>`] where `T` implements [`std::str::FromStr`]
/// This macro returns a [`clap::Result<Vec<T>>`] which allows you as the developer to decide
/// what you'd like to do on a failed parse.
///
/// # Examples
///
/// ```no_run
/// # #[macro_use]
/// # extern crate clap;
/// # use clap::App;
/// # fn main() {
/// let matches = App::new("myapp")
/// .arg_from_usage("[seq]... 'A sequence of pos whole nums, i.e. 20 45'")
/// .get_matches();
///
/// let vals = values_t!(matches.values_of("seq"), u32).unwrap_or_else(|e| e.exit());
/// for v in &vals {
/// println!("{} + 2: {}", v, v + 2);
/// }
///
/// let vals = values_t!(matches, "seq", u32).unwrap_or_else(|e| e.exit());
/// for v in &vals {
/// println!("{} + 2: {}", v, v + 2);
/// }
/// # }
/// ```
/// [`std::str::FromStr`]: https://doc.rust-lang.org/std/str/trait.FromStr.html
/// [`Vec<T>`]: https://doc.rust-lang.org/std/vec/struct.Vec.html
/// [`clap::Result<Vec<T>>`]: ./type.Result.html
#[macro_export]
macro_rules! values_t {
($m:ident, $v:expr, $t:ty) => {
values_t!($m.values_of($v), $t)
};
($m:ident.values_of($v:expr), $t:ty) => {
if let Some(vals) = $m.values_of($v) {
let mut tmp = vec![];
let mut err = None;
for pv in vals {
match pv.parse::<$t>() {
Ok(rv) => tmp.push(rv),
Err(..) => {
err = Some(::clap::Error::value_validation_auto(format!(
"The argument '{}' isn't a valid value",
pv
)));
break;
}
}
}
match err {
Some(e) => Err(e),
None => Ok(tmp),
}
} else {
Err(::clap::Error::argument_not_found_auto($v))
}
};
}
/// Convenience macro getting a typed value [`Vec<T>`] where `T` implements [`std::str::FromStr`]
/// or exiting upon error.
///
/// **NOTE:** This macro is for backwards compatibility sake. Prefer
/// [`values_t!(/* ... */).unwrap_or_else(|e| e.exit())`]
///
/// # Examples
///
/// ```no_run
/// # #[macro_use]
/// # extern crate clap;
/// # use clap::App;
/// # fn main() {
/// let matches = App::new("myapp")
/// .arg_from_usage("[seq]... 'A sequence of pos whole nums, i.e. 20 45'")
/// .get_matches();
///
/// let vals = values_t_or_exit!(matches.values_of("seq"), u32);
/// for v in &vals {
/// println!("{} + 2: {}", v, v + 2);
/// }
///
/// // type for example only
/// let vals: Vec<u32> = values_t_or_exit!(matches, "seq", u32);
/// for v in &vals {
/// println!("{} + 2: {}", v, v + 2);
/// }
/// # }
/// ```
/// [`values_t!(/* ... */).unwrap_or_else(|e| e.exit())`]: ./macro.values_t!.html
/// [`std::str::FromStr`]: https://doc.rust-lang.org/std/str/trait.FromStr.html
/// [`Vec<T>`]: https://doc.rust-lang.org/std/vec/struct.Vec.html
#[macro_export]
macro_rules! values_t_or_exit {
($m:ident, $v:expr, $t:ty) => {
values_t_or_exit!($m.values_of($v), $t)
};
($m:ident.values_of($v:expr), $t:ty) => {
if let Some(vals) = $m.values_of($v) {
vals.map(|v| {
v.parse::<$t>().unwrap_or_else(|_| {
::clap::Error::value_validation_auto(format!(
"One or more arguments aren't valid values"
))
.exit()
})
})
.collect::<Vec<$t>>()
} else {
::clap::Error::argument_not_found_auto($v).exit()
}
};
}
// _clap_count_exprs! is derived from https://github.com/DanielKeep/rust-grabbag
// commit: 82a35ca5d9a04c3b920622d542104e3310ee5b07
// License: MIT
// Copyright ⓒ 2015 grabbag contributors.
// Licensed under the MIT license (see LICENSE or <http://opensource.org
// /licenses/MIT>) or the Apache License, Version 2.0 (see LICENSE of
// <http://www.apache.org/licenses/LICENSE-2.0>), at your option. All
// files in the project carrying such notice may not be copied, modified,
// or distributed except according to those terms.
//
/// Counts the number of comma-delimited expressions passed to it. The result is a compile-time
/// evaluable expression, suitable for use as a static array size, or the value of a `const`.
///
/// # Examples
///
/// ```
/// # #[macro_use] extern crate clap;
/// # fn main() {
/// const COUNT: usize = _clap_count_exprs!(a, 5+1, "hi there!".into_string());
/// assert_eq!(COUNT, 3);
/// # }
/// ```
#[macro_export]
macro_rules! _clap_count_exprs {
() => { 0 };
($e:expr) => { 1 };
($e:expr, $($es:expr),+) => { 1 + $crate::_clap_count_exprs!($($es),*) };
}
/// Convenience macro to generate more complete enums with variants to be used as a type when
/// parsing arguments. This enum also provides a `variants()` function which can be used to
/// retrieve a `Vec<&'static str>` of the variant names, as well as implementing [`FromStr`] and
/// [`Display`] automatically.
///
/// **NOTE:** Case insensitivity is supported for ASCII characters only. It's highly recommended to
/// use [`Arg::case_insensitive(true)`] for args that will be used with these enums
///
/// **NOTE:** This macro automatically implements [`std::str::FromStr`] and [`std::fmt::Display`]
///
/// **NOTE:** These enums support pub (or not) and uses of the `#[derive()]` traits
///
/// # Examples
///
/// ```rust
/// # #[macro_use]
/// # extern crate clap;
/// # use clap::{App, Arg};
/// arg_enum!{
/// #[derive(PartialEq, Debug)]
/// pub enum Foo {
/// Bar,
/// Baz,
/// Qux
/// }
/// }
/// // Foo enum can now be used via Foo::Bar, or Foo::Baz, etc
/// // and implements std::str::FromStr to use with the value_t! macros
/// fn main() {
/// let m = App::new("app")
/// .arg(Arg::from_usage("<foo> 'the foo'")
/// .possible_values(&Foo::variants())
/// .case_insensitive(true))
/// .get_matches_from(vec![
/// "app", "baz"
/// ]);
/// let f = value_t!(m, "foo", Foo).unwrap_or_else(|e| e.exit());
///
/// assert_eq!(f, Foo::Baz);
/// }
/// ```
/// [`FromStr`]: https://doc.rust-lang.org/std/str/trait.FromStr.html
/// [`std::str::FromStr`]: https://doc.rust-lang.org/std/str/trait.FromStr.html
/// [`Display`]: https://doc.rust-lang.org/std/fmt/trait.Display.html
/// [`std::fmt::Display`]: https://doc.rust-lang.org/std/fmt/trait.Display.html
/// [`Arg::case_insensitive(true)`]: ./struct.Arg.html#method.case_insensitive
#[macro_export]
macro_rules! arg_enum {
(@as_item $($i:item)*) => ($($i)*);
(@impls ( $($tts:tt)* ) -> ($e:ident, $($v:ident),+)) => {
arg_enum!(@as_item
$($tts)*
impl ::std::str::FromStr for $e {
type Err = String;
fn from_str(s: &str) -> ::std::result::Result<Self,Self::Err> {
#[allow(deprecated, unused_imports)]
use ::std::ascii::AsciiExt;
match s {
$(stringify!($v) |
_ if s.eq_ignore_ascii_case(stringify!($v)) => Ok($e::$v)),+,
_ => Err({
let v = vec![
$(stringify!($v),)+
];
format!("valid values: {}",
v.join(", "))
}),
}
}
}
impl ::std::fmt::Display for $e {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
match *self {
$($e::$v => write!(f, stringify!($v)),)+
}
}
}
impl $e {
#[allow(dead_code)]
pub fn variants() -> [&'static str; $crate::_clap_count_exprs!($(stringify!($v)),+)] {
[
$(stringify!($v),)+
]
}
});
};
($(#[$($m:meta),+])+ pub enum $e:ident { $($v:ident $(=$val:expr)*,)+ } ) => {
arg_enum!(@impls
($(#[$($m),+])+
pub enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
($(#[$($m:meta),+])+ pub enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
arg_enum!(@impls
($(#[$($m),+])+
pub enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
($(#[$($m:meta),+])+ enum $e:ident { $($v:ident $(=$val:expr)*,)+ } ) => {
arg_enum!(@impls
($(#[$($m),+])+
enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
($(#[$($m:meta),+])+ enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
arg_enum!(@impls
($(#[$($m),+])+
enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
(pub enum $e:ident { $($v:ident $(=$val:expr)*,)+ } ) => {
arg_enum!(@impls
(pub enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
(pub enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
arg_enum!(@impls
(pub enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
(enum $e:ident { $($v:ident $(=$val:expr)*,)+ } ) => {
arg_enum!(@impls
(enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
(enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
arg_enum!(@impls
(enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
}
/// Allows you to pull the version from your Cargo.toml at compile time as
/// `MAJOR.MINOR.PATCH_PKGVERSION_PRE`
///
/// # Examples
///
/// ```no_run
/// # #[macro_use]
/// # extern crate clap;
/// # use clap::App;
/// # fn main() {
/// let m = App::new("app")
/// .version(crate_version!())
/// .get_matches();
/// # }
/// ```
#[cfg(not(feature = "no_cargo"))]
#[macro_export]
macro_rules! crate_version {
() => {
env!("CARGO_PKG_VERSION")
};
}
/// Allows you to pull the authors for the app from your Cargo.toml at
/// compile time in the form:
/// `"author1 lastname <author1@example.com>:author2 lastname <author2@example.com>"`
///
/// You can replace the colons with a custom separator by supplying a
/// replacement string, so, for example,
/// `crate_authors!(",\n")` would become
/// `"author1 lastname <author1@example.com>,\nauthor2 lastname <author2@example.com>,\nauthor3 lastname <author3@example.com>"`
///
/// # Examples
///
/// ```no_run
/// # #[macro_use]
/// # extern crate clap;
/// # use clap::App;
/// # fn main() {
/// let m = App::new("app")
/// .author(crate_authors!("\n"))
/// .get_matches();
/// # }
/// ```
#[cfg(not(feature = "no_cargo"))]
#[macro_export]
macro_rules! crate_authors {
($sep:expr) => {{
use std::ops::Deref;
#[allow(deprecated)]
use std::sync::{Once, ONCE_INIT};
#[allow(missing_copy_implementations)]
#[allow(dead_code)]
struct CargoAuthors {
__private_field: (),
};
impl Deref for CargoAuthors {
type Target = str;
#[allow(unsafe_code)]
fn deref(&self) -> &'static str {
#[allow(deprecated)]
static ONCE: Once = ONCE_INIT;
static mut VALUE: *const String = 0 as *const String;
unsafe {
ONCE.call_once(|| {
let s = env!("CARGO_PKG_AUTHORS").replace(':', $sep);
VALUE = Box::into_raw(Box::new(s));
});
&(*VALUE)[..]
}
}
}
&*CargoAuthors {
__private_field: (),
}
}};
() => {
env!("CARGO_PKG_AUTHORS")
};
}
/// Allows you to pull the description from your Cargo.toml at compile time.
///
/// # Examples
///
/// ```no_run
/// # #[macro_use]
/// # extern crate clap;
/// # use clap::App;
/// # fn main() {
/// let m = App::new("app")
/// .about(crate_description!())
/// .get_matches();
/// # }
/// ```
#[cfg(not(feature = "no_cargo"))]
#[macro_export]
macro_rules! crate_description {
() => {
env!("CARGO_PKG_DESCRIPTION")
};
}
/// Allows you to pull the name from your Cargo.toml at compile time.
///
/// # Examples
///
/// ```no_run
/// # #[macro_use]
/// # extern crate clap;
/// # use clap::App;
/// # fn main() {
/// let m = App::new(crate_name!())
/// .get_matches();
/// # }
/// ```
#[cfg(not(feature = "no_cargo"))]
#[macro_export]
macro_rules! crate_name {
() => {
env!("CARGO_PKG_NAME")
};
}
/// Allows you to build the `App` instance from your Cargo.toml at compile time.
///
/// Equivalent to using the `crate_*!` macros with their respective fields.
///
/// Provided separator is for the [`crate_authors!`](macro.crate_authors.html) macro,
/// refer to the documentation therefor.
///
/// **NOTE:** Changing the values in your `Cargo.toml` does not trigger a re-build automatically,
/// and therefore won't change the generated output until you recompile.
///
/// **Pro Tip:** In some cases you can "trick" the compiler into triggering a rebuild when your
/// `Cargo.toml` is changed by including this in your `src/main.rs` file
/// `include_str!("../Cargo.toml");`
///
/// # Examples
///
/// ```no_run
/// # #[macro_use]
/// # extern crate clap;
/// # fn main() {
/// let m = app_from_crate!().get_matches();
/// # }
/// ```
#[cfg(not(feature = "no_cargo"))]
#[macro_export]
macro_rules! app_from_crate {
() => {
$crate::App::new(crate_name!())
.version(crate_version!())
.author(crate_authors!())
.about(crate_description!())
};
($sep:expr) => {
$crate::App::new(crate_name!())
.version(crate_version!())
.author(crate_authors!($sep))
.about(crate_description!())
};
}
/// Build `App`, `Arg`s, `SubCommand`s and `Group`s with Usage-string like input
/// but without the associated parsing runtime cost.
///
/// `clap_app!` also supports several shorthand syntaxes.
///
/// # Examples
///
/// ```no_run
/// # #[macro_use]
/// # extern crate clap;
/// # fn main() {
/// let matches = clap_app!(myapp =>
/// (version: "1.0")
/// (author: "Kevin K. <kbknapp@gmail.com>")
/// (about: "Does awesome things")
/// (@arg CONFIG: -c --config +takes_value "Sets a custom config file")
/// (@arg INPUT: +required "Sets the input file to use")
/// (@arg debug: -d ... "Sets the level of debugging information")
/// (@group difficulty =>
/// (@arg hard: -h --hard "Sets hard mode")
/// (@arg normal: -n --normal "Sets normal mode")
/// (@arg easy: -e --easy "Sets easy mode")
/// )
/// (@subcommand test =>
/// (about: "controls testing features")
/// (version: "1.3")
/// (author: "Someone E. <someone_else@other.com>")
/// (@arg verbose: -v --verbose "Print test information verbosely")
/// )
/// )
/// .get_matches();
/// # }
/// ```
/// # Shorthand Syntax for Args
///
/// * A single hyphen followed by a character (such as `-c`) sets the [`Arg::short`]
/// * A double hyphen followed by a character or word (such as `--config`) sets [`Arg::long`]
/// * If one wishes to use a [`Arg::long`] with a hyphen inside (i.e. `--config-file`), you
/// must use `--("config-file")` due to limitations of the Rust macro system.
/// * Three dots (`...`) sets [`Arg::multiple(true)`]
/// * Angled brackets after either a short or long will set [`Arg::value_name`] and
/// `Arg::required(true)` such as `--config <FILE>` = `Arg::value_name("FILE")` and
/// `Arg::required(true)`
/// * Square brackets after either a short or long will set [`Arg::value_name`] and
/// `Arg::required(false)` such as `--config [FILE]` = `Arg::value_name("FILE")` and
/// `Arg::required(false)`
/// * There are short hand syntaxes for Arg methods that accept booleans
/// * A plus sign will set that method to `true` such as `+required` = `Arg::required(true)`
/// * An exclamation will set that method to `false` such as `!required` = `Arg::required(false)`
/// * A `#{min, max}` will set [`Arg::min_values(min)`] and [`Arg::max_values(max)`]
/// * An asterisk (`*`) will set `Arg::required(true)`
/// * Curly brackets around a `fn` will set [`Arg::validator`] as in `{fn}` = `Arg::validator(fn)`
/// * An Arg method that accepts a string followed by square brackets will set that method such as
/// `conflicts_with[FOO]` will set `Arg::conflicts_with("FOO")` (note the lack of quotes around
/// `FOO` in the macro)
/// * An Arg method that takes a string and can be set multiple times (such as
/// [`Arg::conflicts_with`]) followed by square brackets and a list of values separated by spaces
/// will set that method such as `conflicts_with[FOO BAR BAZ]` will set
/// `Arg::conflicts_with("FOO")`, `Arg::conflicts_with("BAR")`, and `Arg::conflicts_with("BAZ")`
/// (note the lack of quotes around the values in the macro)
///
/// # Shorthand Syntax for Groups
///
/// * There are short hand syntaxes for `ArgGroup` methods that accept booleans
/// * A plus sign will set that method to `true` such as `+required` = `ArgGroup::required(true)`
/// * An exclamation will set that method to `false` such as `!required` = `ArgGroup::required(false)`
///
/// [`Arg::short`]: ./struct.Arg.html#method.short
/// [`Arg::long`]: ./struct.Arg.html#method.long
/// [`Arg::multiple(true)`]: ./struct.Arg.html#method.multiple
/// [`Arg::value_name`]: ./struct.Arg.html#method.value_name
/// [`Arg::min_values(min)`]: ./struct.Arg.html#method.min_values
/// [`Arg::max_values(max)`]: ./struct.Arg.html#method.max_values
/// [`Arg::validator`]: ./struct.Arg.html#method.validator
/// [`Arg::conflicts_with`]: ./struct.Arg.html#method.conflicts_with
#[macro_export]
macro_rules! clap_app {
(@app ($builder:expr)) => { $builder };
(@app ($builder:expr) (@arg ($name:expr): $($tail:tt)*) $($tt:tt)*) => {
clap_app!{ @app
($builder.arg(
clap_app!{ @arg ($crate::Arg::with_name($name)) (-) $($tail)* }))
$($tt)*
}
};
(@app ($builder:expr) (@arg $name:ident: $($tail:tt)*) $($tt:tt)*) => {
clap_app!{ @app
($builder.arg(
clap_app!{ @arg ($crate::Arg::with_name(stringify!($name))) (-) $($tail)* }))
$($tt)*
}
};
(@app ($builder:expr) (@setting $setting:ident) $($tt:tt)*) => {
clap_app!{ @app
($builder.setting($crate::AppSettings::$setting))
$($tt)*
}
};
// Treat the application builder as an argument to set its attributes
(@app ($builder:expr) (@attributes $($attr:tt)*) $($tt:tt)*) => {
clap_app!{ @app (clap_app!{ @arg ($builder) $($attr)* }) $($tt)* }
};
(@app ($builder:expr) (@group $name:ident => $($tail:tt)*) $($tt:tt)*) => {
clap_app!{ @app
(clap_app!{ @group ($builder, $crate::ArgGroup::with_name(stringify!($name))) $($tail)* })
$($tt)*
}
};
(@app ($builder:expr) (@group $name:ident !$ident:ident => $($tail:tt)*) $($tt:tt)*) => {
clap_app!{ @app
(clap_app!{ @group ($builder, $crate::ArgGroup::with_name(stringify!($name)).$ident(false)) $($tail)* })
$($tt)*
}
};
(@app ($builder:expr) (@group $name:ident +$ident:ident => $($tail:tt)*) $($tt:tt)*) => {
clap_app!{ @app
(clap_app!{ @group ($builder, $crate::ArgGroup::with_name(stringify!($name)).$ident(true)) $($tail)* })
$($tt)*
}
};
// Handle subcommand creation
(@app ($builder:expr) (@subcommand $name:ident => $($tail:tt)*) $($tt:tt)*) => {
clap_app!{ @app
($builder.subcommand(
clap_app!{ @app ($crate::SubCommand::with_name(stringify!($name))) $($tail)* }
))
$($tt)*
}
};
// Yaml like function calls - used for setting various meta directly against the app
(@app ($builder:expr) ($ident:ident: $($v:expr),*) $($tt:tt)*) => {
// clap_app!{ @app ($builder.$ident($($v),*)) $($tt)* }
clap_app!{ @app
($builder.$ident($($v),*))
$($tt)*
}
};
// Add members to group and continue argument handling with the parent builder
(@group ($builder:expr, $group:expr)) => { $builder.group($group) };
// Treat the group builder as an argument to set its attributes
(@group ($builder:expr, $group:expr) (@attributes $($attr:tt)*) $($tt:tt)*) => {
clap_app!{ @group ($builder, clap_app!{ @arg ($group) (-) $($attr)* }) $($tt)* }
};
(@group ($builder:expr, $group:expr) (@arg $name:ident: $($tail:tt)*) $($tt:tt)*) => {
clap_app!{ @group
(clap_app!{ @app ($builder) (@arg $name: $($tail)*) },
$group.arg(stringify!($name)))
$($tt)*
}
};
// No more tokens to munch
(@arg ($arg:expr) $modes:tt) => { $arg };
// Shorthand tokens influenced by the usage_string
(@arg ($arg:expr) $modes:tt --($long:expr) $($tail:tt)*) => {
clap_app!{ @arg ($arg.long($long)) $modes $($tail)* }
};
(@arg ($arg:expr) $modes:tt --$long:ident $($tail:tt)*) => {
clap_app!{ @arg ($arg.long(stringify!($long))) $modes $($tail)* }
};
(@arg ($arg:expr) $modes:tt -$short:ident $($tail:tt)*) => {
clap_app!{ @arg ($arg.short(stringify!($short))) $modes $($tail)* }
};
(@arg ($arg:expr) (-) <$var:ident> $($tail:tt)*) => {
clap_app!{ @arg ($arg.value_name(stringify!($var))) (+) +takes_value +required $($tail)* }
};
(@arg ($arg:expr) (+) <$var:ident> $($tail:tt)*) => {
clap_app!{ @arg ($arg.value_name(stringify!($var))) (+) $($tail)* }
};
(@arg ($arg:expr) (-) [$var:ident] $($tail:tt)*) => {
clap_app!{ @arg ($arg.value_name(stringify!($var))) (+) +takes_value $($tail)* }
};
(@arg ($arg:expr) (+) [$var:ident] $($tail:tt)*) => {
clap_app!{ @arg ($arg.value_name(stringify!($var))) (+) $($tail)* }
};
(@arg ($arg:expr) $modes:tt ... $($tail:tt)*) => {
clap_app!{ @arg ($arg) $modes +multiple $($tail)* }
};
// Shorthand magic
(@arg ($arg:expr) $modes:tt #{$n:expr, $m:expr} $($tail:tt)*) => {
clap_app!{ @arg ($arg) $modes min_values($n) max_values($m) $($tail)* }
};
(@arg ($arg:expr) $modes:tt * $($tail:tt)*) => {
clap_app!{ @arg ($arg) $modes +required $($tail)* }
};
// !foo -> .foo(false)
(@arg ($arg:expr) $modes:tt !$ident:ident $($tail:tt)*) => {
clap_app!{ @arg ($arg.$ident(false)) $modes $($tail)* }
};
// +foo -> .foo(true)
(@arg ($arg:expr) $modes:tt +$ident:ident $($tail:tt)*) => {
clap_app!{ @arg ($arg.$ident(true)) $modes $($tail)* }
};
// Validator
(@arg ($arg:expr) $modes:tt {$fn_:expr} $($tail:tt)*) => {
clap_app!{ @arg ($arg.validator($fn_)) $modes $($tail)* }
};
(@as_expr $expr:expr) => { $expr };
// Help
(@arg ($arg:expr) $modes:tt $desc:tt) => { $arg.help(clap_app!{ @as_expr $desc }) };
// Handle functions that need to be called multiple times for each argument
(@arg ($arg:expr) $modes:tt $ident:ident[$($target:ident)*] $($tail:tt)*) => {
clap_app!{ @arg ($arg $( .$ident(stringify!($target)) )*) $modes $($tail)* }
};
// Inherit builder's functions, e.g. `index(2)`, `requires_if("val", "arg")`
(@arg ($arg:expr) $modes:tt $ident:ident($($expr:expr),*) $($tail:tt)*) => {
clap_app!{ @arg ($arg.$ident($($expr),*)) $modes $($tail)* }
};
// Inherit builder's functions with trailing comma, e.g. `index(2,)`, `requires_if("val", "arg",)`
(@arg ($arg:expr) $modes:tt $ident:ident($($expr:expr,)*) $($tail:tt)*) => {
clap_app!{ @arg ($arg.$ident($($expr),*)) $modes $($tail)* }
};
// Build a subcommand outside of an app.
(@subcommand $name:ident => $($tail:tt)*) => {
clap_app!{ @app ($crate::SubCommand::with_name(stringify!($name))) $($tail)* }
};
// Start the magic
(($name:expr) => $($tail:tt)*) => {{
clap_app!{ @app ($crate::App::new($name)) $($tail)*}
}};
($name:ident => $($tail:tt)*) => {{
clap_app!{ @app ($crate::App::new(stringify!($name))) $($tail)*}
}};
}
macro_rules! impl_settings {
($n:ident, $($v:ident => $c:path),+) => {
pub fn set(&mut self, s: $n) {
match s {
$($n::$v => self.0.insert($c)),+
}
}
pub fn unset(&mut self, s: $n) {
match s {
$($n::$v => self.0.remove($c)),+
}
}
pub fn is_set(&self, s: $n) -> bool {
match s {
$($n::$v => self.0.contains($c)),+
}
}
};
}
// Convenience for writing to stderr thanks to https://github.com/BurntSushi
macro_rules! wlnerr(
(@nopanic $($arg:tt)*) => ({
use std::io::{Write, stderr};
let _ = writeln!(&mut stderr().lock(), $($arg)*);
});
($($arg:tt)*) => ({
use std::io::{Write, stderr};
writeln!(&mut stderr(), $($arg)*).ok();
})
);
#[cfg(feature = "debug")]
#[cfg_attr(feature = "debug", macro_use)]
#[cfg_attr(feature = "debug", allow(unused_macros))]
mod debug_macros {
macro_rules! debugln {
($fmt:expr) => (println!(concat!("DEBUG:clap:", $fmt)));
($fmt:expr, $($arg:tt)*) => (println!(concat!("DEBUG:clap:",$fmt), $($arg)*));
}
macro_rules! sdebugln {
($fmt:expr) => (println!($fmt));
($fmt:expr, $($arg:tt)*) => (println!($fmt, $($arg)*));
}
macro_rules! debug {
($fmt:expr) => (print!(concat!("DEBUG:clap:", $fmt)));
($fmt:expr, $($arg:tt)*) => (print!(concat!("DEBUG:clap:",$fmt), $($arg)*));
}
macro_rules! sdebug {
($fmt:expr) => (print!($fmt));
($fmt:expr, $($arg:tt)*) => (print!($fmt, $($arg)*));
}
}
#[cfg(not(feature = "debug"))]
#[cfg_attr(not(feature = "debug"), macro_use)]
mod debug_macros {
macro_rules! debugln {
($fmt:expr) => {};
($fmt:expr, $($arg:tt)*) => {};
}
macro_rules! sdebugln {
($fmt:expr) => {};
($fmt:expr, $($arg:tt)*) => {};
}
macro_rules! debug {
($fmt:expr) => {};
($fmt:expr, $($arg:tt)*) => {};
}
}
// Helper/deduplication macro for printing the correct number of spaces in help messages
// used in:
// src/args/arg_builder/*.rs
// src/app/mod.rs
macro_rules! write_nspaces {
($dst:expr, $num:expr) => {{
debugln!("write_spaces!: num={}", $num);
for _ in 0..$num {
$dst.write_all(b" ")?;
}
}};
}
// convenience macro for remove an item from a vec
//macro_rules! vec_remove_all {
// ($vec:expr, $to_rem:expr) => {
// debugln!("vec_remove_all! to_rem={:?}", $to_rem);
// for i in (0 .. $vec.len()).rev() {
// let should_remove = $to_rem.any(|name| name == &$vec[i]);
// if should_remove { $vec.swap_remove(i); }
// }
// };
//}
macro_rules! find_from {
($_self:expr, $arg_name:expr, $from:ident, $matcher:expr) => {{
let mut ret = None;
for k in $matcher.arg_names() {
if let Some(f) = find_by_name!($_self, k, flags, iter) {
if let Some(ref v) = f.$from() {
if v.contains($arg_name) {
ret = Some(f.to_string());
}
}
}
if let Some(o) = find_by_name!($_self, k, opts, iter) {
if let Some(ref v) = o.$from() {
if v.contains(&$arg_name) {
ret = Some(o.to_string());
}
}
}
if let Some(pos) = find_by_name!($_self, k, positionals, values) {
if let Some(ref v) = pos.$from() {
if v.contains($arg_name) {
ret = Some(pos.b.name.to_owned());
}
}
}
}
ret
}};
}
//macro_rules! find_name_from {
// ($_self:expr, $arg_name:expr, $from:ident, $matcher:expr) => {{
// let mut ret = None;
// for k in $matcher.arg_names() {
// if let Some(f) = find_by_name!($_self, k, flags, iter) {
// if let Some(ref v) = f.$from() {
// if v.contains($arg_name) {
// ret = Some(f.b.name);
// }
// }
// }
// if let Some(o) = find_by_name!($_self, k, opts, iter) {
// if let Some(ref v) = o.$from() {
// if v.contains(&$arg_name) {
// ret = Some(o.b.name);
// }
// }
// }
// if let Some(pos) = find_by_name!($_self, k, positionals, values) {
// if let Some(ref v) = pos.$from() {
// if v.contains($arg_name) {
// ret = Some(pos.b.name);
// }
// }
// }
// }
// ret
// }};
//}
macro_rules! find_any_by_name {
($p:expr, $name:expr) => {{
fn as_trait_obj<'a, 'b, T: AnyArg<'a, 'b>>(x: &T) -> &AnyArg<'a, 'b> {
x
}
find_by_name!($p, $name, flags, iter)
.map(as_trait_obj)
.or(find_by_name!($p, $name, opts, iter)
.map(as_trait_obj)
.or(find_by_name!($p, $name, positionals, values).map(as_trait_obj)))
}};
}
// Finds an arg by name
macro_rules! find_by_name {
($p:expr, $name:expr, $what:ident, $how:ident) => {
$p.$what.$how().find(|o| o.b.name == $name)
};
}
// Finds an option including if it's aliased
macro_rules! find_opt_by_long {
(@os $_self:ident, $long:expr) => {{
_find_by_long!($_self, $long, opts)
}};
($_self:ident, $long:expr) => {{
_find_by_long!($_self, $long, opts)
}};
}
macro_rules! find_flag_by_long {
(@os $_self:ident, $long:expr) => {{
_find_by_long!($_self, $long, flags)
}};
($_self:ident, $long:expr) => {{
_find_by_long!($_self, $long, flags)
}};
}
macro_rules! _find_by_long {
($_self:ident, $long:expr, $what:ident) => {{
$_self
.$what
.iter()
.filter(|a| a.s.long.is_some())
.find(|a| {
a.s.long.unwrap() == $long
|| (a.s.aliases.is_some()
&& a.s
.aliases
.as_ref()
.unwrap()
.iter()
.any(|&(alias, _)| alias == $long))
})
}};
}
// Finds an option
macro_rules! find_opt_by_short {
($_self:ident, $short:expr) => {{
_find_by_short!($_self, $short, opts)
}};
}
macro_rules! find_flag_by_short {
($_self:ident, $short:expr) => {{
_find_by_short!($_self, $short, flags)
}};
}
macro_rules! _find_by_short {
($_self:ident, $short:expr, $what:ident) => {{
$_self
.$what
.iter()
.filter(|a| a.s.short.is_some())
.find(|a| a.s.short.unwrap() == $short)
}};
}
macro_rules! find_subcmd {
($_self:expr, $sc:expr) => {{
$_self.subcommands.iter().find(|s| {
&*s.p.meta.name == $sc
|| (s.p.meta.aliases.is_some()
&& s.p
.meta
.aliases
.as_ref()
.unwrap()
.iter()
.any(|&(n, _)| n == $sc))
})
}};
}
macro_rules! shorts {
($_self:ident) => {{
_shorts_longs!($_self, short)
}};
}
macro_rules! longs {
($_self:ident) => {{
_shorts_longs!($_self, long)
}};
}
macro_rules! _shorts_longs {
($_self:ident, $what:ident) => {{
$_self
.flags
.iter()
.filter(|f| f.s.$what.is_some())
.map(|f| f.s.$what.as_ref().unwrap())
.chain(
$_self
.opts
.iter()
.filter(|o| o.s.$what.is_some())
.map(|o| o.s.$what.as_ref().unwrap()),
)
}};
}
macro_rules! arg_names {
($_self:ident) => {{
_names!(@args $_self)
}};
}
macro_rules! sc_names {
($_self:ident) => {{
_names!(@sc $_self)
}};
}
macro_rules! _names {
(@args $_self:ident) => {{
$_self.flags.iter().map(|f| &*f.b.name).chain(
$_self
.opts
.iter()
.map(|o| &*o.b.name)
.chain($_self.positionals.values().map(|p| &*p.b.name)),
)
}};
(@sc $_self:ident) => {{
$_self.subcommands.iter().map(|s| &*s.p.meta.name).chain(
$_self
.subcommands
.iter()
.filter(|s| s.p.meta.aliases.is_some())
.flat_map(|s| s.p.meta.aliases.as_ref().unwrap().iter().map(|&(n, _)| n)),
)
}};
}