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#[macro_export]
/// Creates new Vector.
macro_rules! vector {
	() => {
		$crate::Vector(None)
	};
	($elem:expr; $n:expr)=>{
		$crate::Vector(Some(vec![$elem,$n]))
	};
	($($x:expr),+ $(,)?)=>{
		$crate::Vector(Some(vec![$($x),+]))
	}
}

#[macro_export]
/// Checks context has help flag. If the context has help flag, return ShowHelpRequest.
macro_rules! check_help {
	($context:ident) => {
		if $context.is_flag_true("help") {
			return Ok($crate::ShowHelpRequest($context));
			}
	};
}

#[macro_export]
/// Checks context has version flag. If the context has help flag, show version and exit.
macro_rules! check_version {
	($context:ident) => {
		if $context.is_flag_true("version") {
			println!($context.version);
			return $crate::done!();
			}
	};
}

#[macro_export]
/// Checks context has authors flag. If the context has author flag, show authors and exit.
macro_rules! check_authors {
	($context:ident) => {
		if $context.is_flag_true("authors") {
			println!($context.authors);
			return $crate::done!();
			}
	};
}

#[macro_export]
/// Gets license file path of crate from cargo.toml.
macro_rules! crate_license_file {
	() => {
		env!("CARGO_PKG_LICENSE_NAME")
	};
}

#[macro_export]
/// Gets license of crate from cargo.toml.
macro_rules! crate_license {
	() => {
		env!("CARGO_PKG_LICENSE")
	};
}

#[macro_export]
/// Gets license information from cargo.toml.
macro_rules! include_license_file {
	() => {
		include_str!($crate: crate_license_file)
	};
}

#[macro_export]
/// Checks context has license flag. If the context has license flag, exec $license_func and return done.
macro_rules! check_license {
	($context:ident, $license_func:expr) => {
		if $context.is_flag_true("license") {
			$license_func;
			return done!();
			}
	};
}

#[macro_export]
/// Checks context has license flag. If the context has license flag, show authors and exit.
macro_rules! check_copyright {
	($context:ident) => {
		if $context.is_flag_true("copyright") {
			println!("{}", $context.copyright);
			}
	};
}

#[macro_export]
/// Checks context has values of the preset flags.
macro_rules! check_preset_flags {
	($context:ident) => {
		$crate::check_help($context)
		$crate::check_authors($context)
		$crate::check_version($context)
	};
}

#[macro_export]
/// action_result type annotation
macro_rules! action_result {
	() => {
		Result<$crate::ActionResult,$crate::ActionError>
	};
}

#[macro_export]
/// Simple Alias of Ok(Done)
macro_rules! done {
	() => {
		Ok($crate::ActionResult::Done)
	};
}

#[macro_export]
/// Simple Alias of Ok(ShowHelpRequest)
macro_rules! help_req {
	($context:expr) => {
		Ok($crate::ActionResult::ShowHelpRequest($context))
	};
}

#[macro_export]
/// Gets crate name from cargo.toml.
macro_rules! crate_name {
	() => {
		env!("CARGO_PKG_NAME")
	};
}

#[macro_export]
/// Gets crate's authors from cargo.toml.
macro_rules! crate_authors {
	() => {
		env!("CARGO_PKG_AUTHORS")
	};
}

#[macro_export]
///Gets crate's version from cargo.toml.
macro_rules! crate_version {
	() => {
		env!("CARGO_PKG_VERSION")
	};
}

#[macro_export]
///Gets crate's description from cargo.toml.
macro_rules! crate_description {
	() => {
		env!("CARGO_PKG_DESCRIPTION")
	};
}

#[macro_export]
/// Macro for convinience to create root command.
macro_rules! root_from_crate {
	() => {
		Command::with_base(
			$crate::crate_name!(),
			$crate::crate_authors!(),
			$crate::crate_version!(),
			$crate::crate_description!(),
			None
			),
	};
	($action:expr)=>{
		Command::with_base(
			$crate::crate_name!(),
			$crate::crate_authors!(),
			$crate::crate_version!(),
			$crate::crate_description!(),
			Some($action))
	}
}

#[macro_export]
/// Macro for preset root.
macro_rules! preset_root {
	() => {
		Command::with_base(
			$crate::crate_name!(),
			$crate::crate_authors!(),
			$crate::crate_version!(),
			$crate::crate_description!(),
			None
			),
	};
	($action:expr)=>{
		Command::with_base(
			$crate::crate_name!(),
			$crate::crate_authors!(),
			$crate::crate_version!(),
			$crate::crate_description!(),
			Some($action))
	}
}