/// 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 instnace /// 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` 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`]: 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`] where `T` implements [`std::str::FromStr`] /// This macro returns a [`clap::Result>`] 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`]: https://doc.rust-lang.org/std/vec/struct.Vec.html /// [`clap::Result>`]: ./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`] 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 = 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`]: 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::<$t>().unwrap_or_else(|_|{ ::clap::Error::value_validation_auto( format!("One or more arguments aren't valid values")).exit() })).collect::>() } else { ::clap::Error::argument_not_found_auto($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 ) or the Apache License, Version 2.0 (see LICENSE of // ), 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 + _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 /// /// **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 /// /// ```no_run /// # #[macro_use] /// # extern crate clap; /// # use clap::{App, Arg}; /// arg_enum!{ /// #[derive(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_from_usage(" 'the foo'") /// .get_matches(); /// let f = value_t!(m, "foo", Foo).unwrap_or_else(|e| e.exit()); /// /// // Use f like any other Foo variant... /// } /// ``` /// [`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 #[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 { 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 $e { #[allow(dead_code)] pub fn variants() -> [&'static str; _clap_count_exprs!($(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),+])+ 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),+) ); }; (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(); /// # } /// ``` #[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 as /// "author1 lastname. ", /// "author2 lastname. " /// /// # Examples /// /// ```no_run /// # #[macro_use] /// # extern crate clap; /// # use clap::App; /// # fn main() { /// let m = App::new("app") /// .author(crate_authors!()) /// .get_matches(); /// # } /// ``` #[macro_export] macro_rules! crate_authors { () => { env!("CARGO_PKG_AUTHORS") }; } /// Build `App`, `Arg`s, `SubCommand`s and `Group`s with Usage-string like input /// but without the parsing. #[macro_export] macro_rules! clap_app { (@app ($builder:expr)) => { $builder }; (@app ($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 it's 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)* } }; // 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) }; (@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: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 $($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 (@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)*} }}; } 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: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! 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!($w, " ")); } }) } // Helper/deduplication macro for printing the correct number of spaces in help messages // used in: // src/args/arg_builder/*.rs // src/app/mod.rs macro_rules! write_nspaces { ($dst:expr, $num:expr) => ({ debugln!("macro=write_spaces!;num={}", $num); for _ in 0..$num { try!($dst.write(b" ")); } }) } // convenience macro for remove an item from a vec macro_rules! vec_remove { ($vec:expr, $to_rem:expr) => { debugln!("macro=vec_remove!;"); for i in (0 .. $vec.len()).rev() { let should_remove = &$vec[i] == $to_rem; if should_remove { $vec.swap_remove(i); } } }; } // convenience macro for remove an item from a vec macro_rules! vec_remove_all { ($vec:expr, $to_rem:expr) => { debugln!("macro=vec_remove!;"); for i in (0 .. $vec.len()).rev() { let should_remove = $to_rem.contains(&$vec[i]); if should_remove { $vec.swap_remove(i); } } }; }