mirror of
https://github.com/clap-rs/clap
synced 2024-12-20 17:43:07 +00:00
609 lines
20 KiB
Rust
609 lines
20 KiB
Rust
/// A convienience macro for loading the YAML file at compile time (relative to the current file,
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/// like modules work). That YAML object can then be passed to this function.
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///
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/// # Panics
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///
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/// The YAML file must be properly formatted or this function will panic!(). A good way to
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/// ensure this doesn't happen is to run your program with the `--help` switch. If this passes
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/// without error, you needn't worry because the YAML is properly formatted.
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///
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/// # Examples
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///
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/// The following example shows how to load a properly formatted YAML file to build an instnace
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/// of an `App` struct.
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///
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/// ```ignore
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/// # use clap::App;
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/// let yml = load_yaml!("app.yml");
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/// let app = App::from_yaml(yml);
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///
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/// // continued logic goes here, such as `app.get_matches()` etc.
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/// ```
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#[cfg(feature = "yaml")]
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#[macro_export]
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macro_rules! load_yaml {
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($yml:expr) => (
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&::clap::YamlLoader::load_from_str(include_str!($yml)).ok().expect("failed to load YAML file")[0]
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);
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}
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/// Convenience macro getting a typed value `T` where `T` implements `std::str::FromStr` from an
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/// argument value. This macro returns a `Result<T,String>` which allows you as the developer to
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/// decide what you'd like to do on a failed parse. There are two types of errors, parse failures
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/// and those where the argument wasn't present (such as a non-required argument). You can use
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/// it to get a single value, or a iterator as with the `ArgMatches::values_of`
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///
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/// # Examples
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///
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/// ```no_run
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/// # #[macro_use]
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/// # extern crate clap;
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/// # use clap::App;
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/// # fn main() {
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/// let matches = App::new("myapp")
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/// .arg_from_usage("[length] 'Set the length to use as a pos whole num, i.e. 20'")
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/// .get_matches();
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///
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/// let len = value_t!(matches.value_of("length"), u32).unwrap_or_else(|e| e.exit());
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/// let also_len = value_t!(matches, "length", u32).unwrap_or_else(|e| e.exit());
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///
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/// println!("{} + 2: {}", len, len + 2);
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/// # }
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/// ```
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#[macro_export]
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macro_rules! value_t {
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($m:ident, $v:expr, $t:ty) => {
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value_t!($m.value_of($v), $t)
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};
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($m:ident.value_of($v:expr), $t:ty) => {
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if let Some(v) = $m.value_of($v) {
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match v.parse::<$t>() {
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Ok(val) => Ok(val),
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Err(_) =>
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Err(::clap::Error::value_validation(
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format!("The argument '{}' isn't a valid value", v))),
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}
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} else {
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Err(::clap::Error::argument_not_found($v))
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}
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};
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}
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/// Convenience macro getting a typed value `T` where `T` implements `std::str::FromStr` or
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/// exiting upon error instead of returning a `Result`
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///
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/// **NOTE:** This macro is for backwards compatibility sake. Prefer
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/// `value_t!(/* ... */).unwrap_or_else(|e| e.exit())`
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///
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/// # Examples
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///
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/// ```no_run
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/// # #[macro_use]
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/// # extern crate clap;
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/// # use clap::App;
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/// # fn main() {
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/// let matches = App::new("myapp")
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/// .arg_from_usage("[length] 'Set the length to use as a pos whole num, i.e. 20'")
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/// .get_matches();
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///
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/// let len = value_t_or_exit!(matches.value_of("length"), u32);
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/// let also_len = value_t_or_exit!(matches, "length", u32);
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///
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/// println!("{} + 2: {}", len, len + 2);
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/// # }
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/// ```
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#[macro_export]
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macro_rules! value_t_or_exit {
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($m:ident, $v:expr, $t:ty) => {
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value_t!($m.value_of($v), $t)
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};
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($m:ident.value_of($v:expr), $t:ty) => {
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if let Some(v) = $m.value_of($v) {
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match v.parse::<$t>() {
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Ok(val) => val,
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Err(_) =>
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::clap::Error::value_validation(
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format!("The argument '{}' isn't a valid value", v)).exit(),
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}
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} else {
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::clap::Error::argument_not_found($v).exit()
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}
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};
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}
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/// Convenience macro getting a typed value `Vec<T>` where `T` implements `std::str::FromStr` This
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/// macro returns a `clap::Result<Vec<T>>` (`Result<Vec<T>, clap::Error>`) which allows you as the
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/// developer to decide what you'd like to do on a failed parse.
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///
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/// # Examples
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///
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/// ```no_run
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/// # #[macro_use]
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/// # extern crate clap;
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/// # use clap::App;
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/// # fn main() {
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/// let matches = App::new("myapp")
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/// .arg_from_usage("[seq]... 'A sequence of pos whole nums, i.e. 20 45'")
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/// .get_matches();
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///
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/// let vals = values_t!(matches.values_of("seq"), u32).unwrap_or_else(|e| e.exit());
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/// for v in &vals {
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/// println!("{} + 2: {}", v, v + 2);
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/// }
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///
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/// let vals = values_t!(matches, "seq", u32).unwrap_or_else(|e| e.exit());
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/// for v in &vals {
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/// println!("{} + 2: {}", v, v + 2);
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/// }
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/// # }
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/// ```
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#[macro_export]
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macro_rules! values_t {
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($m:ident, $v:expr, $t:ty) => {
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values_t!($m.values_of($v), $t)
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};
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($m:ident.values_of($v:expr), $t:ty) => {
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if let Some(vals) = $m.values_of($v) {
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let mut tmp = vec![];
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let mut err = None;
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for pv in vals {
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match pv.parse::<$t>() {
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Ok(rv) => tmp.push(rv),
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Err(..) => {
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err = Some(::clap::Error::value_validation(
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format!("The argument '{}' isn't a valid value", pv)));
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break
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}
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}
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}
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match err {
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Some(e) => Err(e),
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None => Ok(tmp),
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}
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} else {
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Err(::clap::Error::argument_not_found($v))
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}
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};
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}
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/// Convenience macro getting a typed value `Vec<T>` where `T` implements `std::str::FromStr` or
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/// exiting upon error.
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///
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/// **NOTE:** This macro is for backwards compatibility sake. Prefer
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/// `values_t!(/* ... */).unwrap_or_else(|e| e.exit())`
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///
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/// # Examples
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///
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/// ```no_run
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/// # #[macro_use]
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/// # extern crate clap;
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/// # use clap::App;
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/// # fn main() {
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/// let matches = App::new("myapp")
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/// .arg_from_usage("[seq]... 'A sequence of pos whole nums, i.e. 20 45'")
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/// .get_matches();
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///
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/// let vals = values_t_or_exit!(matches.values_of("seq"), u32);
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/// for v in &vals {
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/// println!("{} + 2: {}", v, v + 2);
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/// }
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///
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/// // type for example only
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/// let vals: Vec<u32> = values_t_or_exit!(matches, "seq", u32);
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/// for v in &vals {
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/// println!("{} + 2: {}", v, v + 2);
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/// }
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/// # }
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/// ```
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#[macro_export]
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macro_rules! values_t_or_exit {
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($m:ident, $v:expr, $t:ty) => {
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values_t_or_exit!($m.values_of($v), $t)
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};
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($m:ident.values_of($v:expr), $t:ty) => {
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if let Some(vals) = $m.values_of($v) {
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vals.map(|v| v.parse::<$t>().unwrap_or_else(|_|{
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::clap::Error::value_validation(
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format!("One or more arguments aren't valid values")).exit()
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})).collect::<Vec<$t>>()
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} else {
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::clap::Error::argument_not_found($v).exit()
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}
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};
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}
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/// Convenience macro to generate more complete enums with variants to be used as a type when
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/// parsing arguments. This enum also provides a `variants()` function which can be used to
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/// retrieve a `Vec<&'static str>` of the variant names, as well as implementing `FromStr` and
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/// `Display` automatically.
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///
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/// **NOTE:** Case insensitivity is supported for ASCII characters only
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///
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/// **NOTE:** This macro automatically implements std::str::FromStr and std::fmt::Display
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///
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/// **NOTE:** These enums support pub (or not) and uses of the #[derive()] traits
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///
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/// # Examples
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///
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/// ```no_run
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/// # #[macro_use]
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/// # extern crate clap;
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/// # use clap::{App, Arg};
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/// arg_enum!{
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/// #[derive(Debug)]
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/// pub enum Foo {
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/// Bar,
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/// Baz,
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/// Qux
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/// }
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/// }
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/// // Foo enum can now be used via Foo::Bar, or Foo::Baz, etc
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/// // and implements std::str::FromStr to use with the value_t! macros
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/// fn main() {
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/// let m = App::new("app")
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/// .arg_from_usage("<foo> 'the foo'")
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/// .get_matches();
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/// let f = value_t!(m, "foo", Foo).unwrap_or_else(|e| e.exit());
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///
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/// // Use f like any other Foo variant...
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/// }
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/// ```
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#[macro_export]
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macro_rules! arg_enum {
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(@as_item $($i:item)*) => ($($i)*);
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(@impls ( $($tts:tt)* ) -> ($e:ident, $($v:ident),+)) => {
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arg_enum!(@as_item
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$($tts)*
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impl ::std::str::FromStr for $e {
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type Err = String;
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fn from_str(s: &str) -> Result<Self,Self::Err> {
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use ::std::ascii::AsciiExt;
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match s {
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$(stringify!($v) |
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_ if s.eq_ignore_ascii_case(stringify!($v)) => Ok($e::$v)),+,
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_ => Err({
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let v = vec![
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$(stringify!($v),)+
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];
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format!("valid values:{}",
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v.iter().fold(String::new(), |a, i| {
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a + &format!(" {}", i)[..]
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}))
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}),
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}
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}
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}
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impl ::std::fmt::Display for $e {
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fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
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match *self {
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$($e::$v => write!(f, stringify!($v)),)+
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}
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}
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}
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impl $e {
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#[allow(dead_code)]
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pub fn variants() -> Vec<&'static str> {
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vec![
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$(stringify!($v),)+
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]
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}
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});
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};
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(#[$($m:meta),+] pub enum $e:ident { $($v:ident),+ } ) => {
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arg_enum!(@impls
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(#[$($m),+]
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pub enum $e {
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$($v),+
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}) -> ($e, $($v),+)
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);
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};
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(#[$($m:meta),+] enum $e:ident { $($v:ident),+ } ) => {
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arg_enum!(@impls
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(#[$($m),+]
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enum $e {
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$($v),+
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}) -> ($e, $($v),+)
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);
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};
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(pub enum $e:ident { $($v:ident),+ } ) => {
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arg_enum!(@impls
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(pub enum $e {
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$($v),+
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}) -> ($e, $($v),+)
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);
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};
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(enum $e:ident { $($v:ident),+ } ) => {
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arg_enum!(@impls
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(enum $e {
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$($v),+
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}) -> ($e, $($v),+)
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);
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};
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}
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/// Allows you pull the version for an from your Cargo.toml at compile time as
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/// MAJOR.MINOR.PATCH_PKGVERSION_PRE
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///
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/// # Examples
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///
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/// ```no_run
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/// # #[macro_use]
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/// # extern crate clap;
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/// # use clap::App;
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/// # fn main() {
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/// let m = App::new("app")
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/// .version(crate_version!())
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/// .get_matches();
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/// # }
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/// ```
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#[macro_export]
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macro_rules! crate_version {
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() => {
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env!("CARGO_PKG_VERSION")
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};
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}
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/// App, Arg, SubCommand and Group builder macro (Usage-string like input) must be compiled with
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/// the `unstable` feature in order to use.
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#[cfg_attr(feature = "unstable", macro_export)]
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macro_rules! clap_app {
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(@app ($builder:expr)) => { $builder };
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(@app ($builder:expr) (@arg $name:ident: $($tail:tt)*) $($tt:tt)*) => {
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clap_app!{ @app
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($builder.arg(clap_app!{ @arg ($crate::Arg::with_name(stringify!($name))) (-) $($tail)* }))
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$($tt)*
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}
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};
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(@app ($builder:expr) (@setting $setting:ident) $($tt:tt)*) => {
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clap_app!{ @app
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($builder.setting($crate::AppSettings::$setting))
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$($tt)*
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}
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};
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// Treat the application builder as an argument to set it's attributes
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(@app ($builder:expr) (@attributes $($attr:tt)*) $($tt:tt)*) => {
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clap_app!{ @app (clap_app!{ @arg ($builder) $($attr)* }) $($tt)* }
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};
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(@app ($builder:expr) (@group $name:ident => $($tail:tt)*) $($tt:tt)*) => {
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clap_app!{ @app
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(clap_app!{ @group ($builder, $crate::ArgGroup::with_name(stringify!($name))) $($tail)* })
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$($tt)*
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}
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};
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// Handle subcommand creation
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(@app ($builder:expr) (@subcommand $name:ident => $($tail:tt)*) $($tt:tt)*) => {
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clap_app!{ @app
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($builder.subcommand(
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clap_app!{ @app ($crate::SubCommand::with_name(stringify!($name))) $($tail)* }
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))
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$($tt)*
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}
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};
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// Yaml like function calls - used for setting various meta directly against the app
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(@app ($builder:expr) ($ident:ident: $($v:expr),*) $($tt:tt)*) => {
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// clap_app!{ @app ($builder.$ident($($v),*)) $($tt)* }
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clap_app!{ @app
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($builder.$ident($($v),*))
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$($tt)*
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}
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};
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// Add members to group and continue argument handling with the parent builder
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(@group ($builder:expr, $group:expr)) => { $builder.group($group) };
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(@group ($builder:expr, $group:expr) (@attributes $($attr:tt)*) $($tt:tt)*) => {
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clap_app!{ @group ($builder, clap_app!{ @arg ($group) (-) $($attr)* }) $($tt)* }
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};
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(@group ($builder:expr, $group:expr) (@arg $name:ident: $($tail:tt)*) $($tt:tt)*) => {
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clap_app!{ @group
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(clap_app!{ @app ($builder) (@arg $name: $($tail)*) },
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$group.arg(stringify!($name)))
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$($tt)*
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}
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};
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// No more tokens to munch
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(@arg ($arg:expr) $modes:tt) => { $arg };
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// Shorthand tokens influenced by the usage_string
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(@arg ($arg:expr) $modes:tt --$long:ident $($tail:tt)*) => {
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clap_app!{ @arg ($arg.long(stringify!($long))) $modes $($tail)* }
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};
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(@arg ($arg:expr) $modes:tt -$short:ident $($tail:tt)*) => {
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clap_app!{ @arg ($arg.short(stringify!($short))) $modes $($tail)* }
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};
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(@arg ($arg:expr) (-) <$var:ident> $($tail:tt)*) => {
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clap_app!{ @arg ($arg.value_name(stringify!($var))) (+) +takes_value +required $($tail)* }
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};
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(@arg ($arg:expr) (+) <$var:ident> $($tail:tt)*) => {
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clap_app!{ @arg ($arg.value_name(stringify!($var))) (+) $($tail)* }
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};
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(@arg ($arg:expr) (-) [$var:ident] $($tail:tt)*) => {
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clap_app!{ @arg ($arg.value_name(stringify!($var))) (+) +takes_value $($tail)* }
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};
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(@arg ($arg:expr) (+) [$var:ident] $($tail:tt)*) => {
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clap_app!{ @arg ($arg.value_name(stringify!($var))) (+) $($tail)* }
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};
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(@arg ($arg:expr) $modes:tt ... $($tail:tt)*) => {
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clap_app!{ @arg ($arg) $modes +multiple $($tail)* }
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};
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// Shorthand magic
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(@arg ($arg:expr) $modes:tt #{$n:expr, $m:expr} $($tail:tt)*) => {
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clap_app!{ @arg ($arg) $modes min_values($n) max_values($m) $($tail)* }
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};
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(@arg ($arg:expr) $modes:tt * $($tail:tt)*) => {
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clap_app!{ @arg ($arg) $modes +required $($tail)* }
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};
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// !foo -> .foo(false)
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(@arg ($arg:expr) $modes:tt !$ident $($tail:tt)*) => {
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clap_app!{ @arg ($arg.$ident(false)) $modes $($tail)* }
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};
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// foo -> .foo(true)
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(@arg ($arg:expr) $modes:tt +$ident:ident $($tail:tt)*) => {
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clap_app!{ @arg ($arg.$ident(true)) $modes $($tail)* }
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};
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// Validator
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(@arg ($arg:expr) $modes:tt {$fn_:expr} $($tail:tt)*) => {
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clap_app!{ @arg ($arg.validator($fn_)) $modes $($tail)* }
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};
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(@as_expr $expr:expr) => { $expr };
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// Help
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(@arg ($arg:expr) $modes:tt $desc:tt) => { $arg.help(clap_app!{ @as_expr $desc }) };
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// Handle functions that need to be called multiple times for each argument
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(@arg ($arg:expr) $modes:tt $ident:ident[$($target:ident)*] $($tail:tt)*) => {
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|
clap_app!{ @arg ($arg $( .$ident(stringify!($target)) )*) $modes $($tail)* }
|
|
};
|
|
// Inherit builder's functions
|
|
(@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:ident => $($tail:tt)*) => {{
|
|
clap_app!{ @app ($crate::App::new(stringify!($name))) $($tail)*}
|
|
}};
|
|
}
|
|
|
|
// used in src/args/arg_builder/option.rs
|
|
macro_rules! print_opt_help {
|
|
($opt:ident, $spc:expr, $w:ident) => {
|
|
debugln!("macro=print_opt_help!;");
|
|
if let Some(h) = $opt.help {
|
|
if h.contains("{n}") {
|
|
let mut hel = h.split("{n}");
|
|
if let Some(part) = hel.next() {
|
|
try!(write!($w, "{}", part));
|
|
}
|
|
for part in hel {
|
|
try!(write!($w, "\n"));
|
|
write_spaces!($spc, $w);
|
|
try!(write!($w, "{}", part));
|
|
}
|
|
} else {
|
|
try!(write!($w, "{}", h));
|
|
}
|
|
if let Some(ref pv) = $opt.possible_vals {
|
|
try!(write!($w, " [values:"));
|
|
for pv_s in pv.iter() {
|
|
try!(write!($w, " {}", pv_s));
|
|
}
|
|
try!(write!($w, "]"));
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
macro_rules! impl_settings {
|
|
($n:ident, $($v:ident => $c:ident),+) => {
|
|
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(
|
|
($($arg:tt)*) => ({
|
|
use std::io::{Write, stderr};
|
|
writeln!(&mut stderr(), $($arg)*).ok();
|
|
})
|
|
);
|
|
macro_rules! werr(
|
|
($($arg:tt)*) => ({
|
|
use std::io::{Write, stderr};
|
|
write!(&mut stderr(), $($arg)*).ok();
|
|
})
|
|
);
|
|
|
|
#[cfg(feature = "debug")]
|
|
#[cfg_attr(feature = "debug", macro_use)]
|
|
mod debug_macros {
|
|
macro_rules! debugln {
|
|
($fmt:expr) => (println!(concat!("**DEBUG** ", $fmt)));
|
|
($fmt:expr, $($arg:tt)*) => (println!(concat!("**DEBUG** ",$fmt), $($arg)*));
|
|
}
|
|
macro_rules! sdebugln {
|
|
($fmt:expr) => (println!($fmt));
|
|
($fmt:expr, $($arg:tt)*) => (println!($fmt, $($arg)*));
|
|
}
|
|
macro_rules! debug {
|
|
($fmt:expr) => (print!(concat!("**DEBUG** ", $fmt)));
|
|
($fmt:expr, $($arg:tt)*) => (print!(concat!("**DEBUG** ",$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! sdebug {
|
|
($fmt:expr) => ();
|
|
($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_spaces {
|
|
($num:expr, $w:ident) => ({
|
|
debugln!("macro=write_spaces!;");
|
|
for _ in 0..$num {
|
|
try!(write!($w, " "));
|
|
}
|
|
})
|
|
}
|
|
|
|
// convenience macro for remove an item from a vec
|
|
macro_rules! vec_remove {
|
|
($vec:expr, $to_rem:ident) => {
|
|
debugln!("macro=write_spaces!;");
|
|
{
|
|
let mut ix = None;
|
|
$vec.dedup();
|
|
for (i, val) in $vec.iter().enumerate() {
|
|
if val == $to_rem {
|
|
ix = Some(i);
|
|
break;
|
|
}
|
|
}
|
|
if let Some(i) = ix {
|
|
$vec.remove(i);
|
|
}
|
|
}
|
|
}
|
|
}
|