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Diffstat (limited to 'vendor/clap/src/builder/action.rs')
| -rw-r--r-- | vendor/clap/src/builder/action.rs | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/vendor/clap/src/builder/action.rs b/vendor/clap/src/builder/action.rs new file mode 100644 index 000000000..9739f8800 --- /dev/null +++ b/vendor/clap/src/builder/action.rs @@ -0,0 +1,344 @@ +/// Behavior of arguments when they are encountered while parsing +/// +/// # Examples +/// +#[cfg_attr(not(feature = "help"), doc = " ```ignore")] +#[cfg_attr(feature = "help", doc = " ```")] +/// # use clap::Command; +/// # use clap::Arg; +/// let cmd = Command::new("mycmd") +/// .arg( +/// Arg::new("special-help") +/// .short('?') +/// .action(clap::ArgAction::Help) +/// ); +/// +/// // Existing help still exists +/// let err = cmd.clone().try_get_matches_from(["mycmd", "-h"]).unwrap_err(); +/// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayHelp); +/// +/// // New help available +/// let err = cmd.try_get_matches_from(["mycmd", "-?"]).unwrap_err(); +/// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayHelp); +/// ``` +#[derive(Clone, Debug)] +#[non_exhaustive] +#[allow(missing_copy_implementations)] // In the future, we may accept `Box<dyn ...>` +pub enum ArgAction { + /// When encountered, store the associated value(s) in [`ArgMatches`][crate::ArgMatches] + /// + /// **NOTE:** If the argument has previously been seen, it will result in a + /// [`ArgumentConflict`][crate::error::ErrorKind::ArgumentConflict] unless + /// [`Command::args_override_self(true)`][crate::Command::args_override_self] is set. + /// + /// # Examples + /// + /// ```rust + /// # use clap::Command; + /// # use clap::Arg; + /// let cmd = Command::new("mycmd") + /// .arg( + /// Arg::new("flag") + /// .long("flag") + /// .action(clap::ArgAction::Set) + /// ); + /// + /// let matches = cmd.try_get_matches_from(["mycmd", "--flag", "value"]).unwrap(); + /// assert!(matches.contains_id("flag")); + /// assert_eq!( + /// matches.get_many::<String>("flag").unwrap_or_default().map(|v| v.as_str()).collect::<Vec<_>>(), + /// vec!["value"] + /// ); + /// ``` + Set, + /// When encountered, store the associated value(s) in [`ArgMatches`][crate::ArgMatches] + /// + /// # Examples + /// + /// ```rust + /// # use clap::Command; + /// # use clap::Arg; + /// let cmd = Command::new("mycmd") + /// .arg( + /// Arg::new("flag") + /// .long("flag") + /// .action(clap::ArgAction::Append) + /// ); + /// + /// let matches = cmd.try_get_matches_from(["mycmd", "--flag", "value1", "--flag", "value2"]).unwrap(); + /// assert!(matches.contains_id("flag")); + /// assert_eq!( + /// matches.get_many::<String>("flag").unwrap_or_default().map(|v| v.as_str()).collect::<Vec<_>>(), + /// vec!["value1", "value2"] + /// ); + /// ``` + Append, + /// When encountered, act as if `"true"` was encountered on the command-line + /// + /// If no [`default_value`][super::Arg::default_value] is set, it will be `false`. + /// + /// No value is allowed. To optionally accept a value, see + /// [`Arg::default_missing_value`][super::Arg::default_missing_value] + /// + /// **NOTE:** If the argument has previously been seen, it will result in a + /// [`ArgumentConflict`][crate::error::ErrorKind::ArgumentConflict] unless + /// [`Command::args_override_self(true)`][crate::Command::args_override_self] is set. + /// + /// # Examples + /// + /// ```rust + /// # use clap::Command; + /// # use clap::Arg; + /// let cmd = Command::new("mycmd") + /// .arg( + /// Arg::new("flag") + /// .long("flag") + /// .action(clap::ArgAction::SetTrue) + /// ); + /// + /// let matches = cmd.clone().try_get_matches_from(["mycmd", "--flag"]).unwrap(); + /// assert!(matches.contains_id("flag")); + /// assert_eq!( + /// matches.get_flag("flag"), + /// true + /// ); + /// + /// let matches = cmd.try_get_matches_from(["mycmd"]).unwrap(); + /// assert!(matches.contains_id("flag")); + /// assert_eq!( + /// matches.get_flag("flag"), + /// false + /// ); + /// ``` + /// + /// You can use [`TypedValueParser::map`][crate::builder::TypedValueParser::map] to have the + /// flag control an application-specific type: + /// ```rust + /// # use clap::Command; + /// # use clap::Arg; + /// # use clap::builder::TypedValueParser as _; + /// # use clap::builder::BoolishValueParser; + /// let cmd = Command::new("mycmd") + /// .arg( + /// Arg::new("flag") + /// .long("flag") + /// .action(clap::ArgAction::SetTrue) + /// .value_parser( + /// BoolishValueParser::new() + /// .map(|b| -> usize { + /// if b { 10 } else { 5 } + /// }) + /// ) + /// ); + /// + /// let matches = cmd.clone().try_get_matches_from(["mycmd", "--flag"]).unwrap(); + /// assert!(matches.contains_id("flag")); + /// assert_eq!( + /// matches.get_one::<usize>("flag").copied(), + /// Some(10) + /// ); + /// + /// let matches = cmd.try_get_matches_from(["mycmd"]).unwrap(); + /// assert!(matches.contains_id("flag")); + /// assert_eq!( + /// matches.get_one::<usize>("flag").copied(), + /// Some(5) + /// ); + /// ``` + SetTrue, + /// When encountered, act as if `"false"` was encountered on the command-line + /// + /// If no [`default_value`][super::Arg::default_value] is set, it will be `true`. + /// + /// No value is allowed. To optionally accept a value, see + /// [`Arg::default_missing_value`][super::Arg::default_missing_value] + /// + /// **NOTE:** If the argument has previously been seen, it will result in a + /// [`ArgumentConflict`][crate::error::ErrorKind::ArgumentConflict] unless + /// [`Command::args_override_self(true)`][crate::Command::args_override_self] is set. + /// + /// # Examples + /// + /// ```rust + /// # use clap::Command; + /// # use clap::Arg; + /// let cmd = Command::new("mycmd") + /// .arg( + /// Arg::new("flag") + /// .long("flag") + /// .action(clap::ArgAction::SetFalse) + /// ); + /// + /// let matches = cmd.clone().try_get_matches_from(["mycmd", "--flag"]).unwrap(); + /// assert!(matches.contains_id("flag")); + /// assert_eq!( + /// matches.get_flag("flag"), + /// false + /// ); + /// + /// let matches = cmd.try_get_matches_from(["mycmd"]).unwrap(); + /// assert!(matches.contains_id("flag")); + /// assert_eq!( + /// matches.get_flag("flag"), + /// true + /// ); + /// ``` + SetFalse, + /// When encountered, increment a `u8` counter + /// + /// If no [`default_value`][super::Arg::default_value] is set, it will be `0`. + /// + /// No value is allowed. To optionally accept a value, see + /// [`Arg::default_missing_value`][super::Arg::default_missing_value] + /// + /// # Examples + /// + /// ```rust + /// # use clap::Command; + /// # use clap::Arg; + /// let cmd = Command::new("mycmd") + /// .arg( + /// Arg::new("flag") + /// .long("flag") + /// .action(clap::ArgAction::Count) + /// ); + /// + /// let matches = cmd.clone().try_get_matches_from(["mycmd", "--flag", "--flag"]).unwrap(); + /// assert!(matches.contains_id("flag")); + /// assert_eq!( + /// matches.get_count("flag"), + /// 2 + /// ); + /// + /// let matches = cmd.try_get_matches_from(["mycmd"]).unwrap(); + /// assert!(matches.contains_id("flag")); + /// assert_eq!( + /// matches.get_count("flag"), + /// 0 + /// ); + /// ``` + Count, + /// When encountered, display [`Command::print_help`][super::Command::print_help] + /// + /// Depending on the flag, [`Command::print_long_help`][super::Command::print_long_help] may be shown + /// + /// # Examples + /// + #[cfg_attr(not(feature = "help"), doc = " ```ignore")] + #[cfg_attr(feature = "help", doc = " ```")] + /// # use clap::Command; + /// # use clap::Arg; + /// let cmd = Command::new("mycmd") + /// .arg( + /// Arg::new("special-help") + /// .short('?') + /// .action(clap::ArgAction::Help) + /// ); + /// + /// // Existing help still exists + /// let err = cmd.clone().try_get_matches_from(["mycmd", "-h"]).unwrap_err(); + /// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayHelp); + /// + /// // New help available + /// let err = cmd.try_get_matches_from(["mycmd", "-?"]).unwrap_err(); + /// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayHelp); + /// ``` + Help, + /// When encountered, display [`Command::version`][super::Command::version] + /// + /// Depending on the flag, [`Command::long_version`][super::Command::long_version] may be shown + /// + /// # Examples + /// + /// ```rust + /// # use clap::Command; + /// # use clap::Arg; + /// let cmd = Command::new("mycmd") + /// .version("1.0.0") + /// .arg( + /// Arg::new("special-version") + /// .long("special-version") + /// .action(clap::ArgAction::Version) + /// ); + /// + /// // Existing help still exists + /// let err = cmd.clone().try_get_matches_from(["mycmd", "--version"]).unwrap_err(); + /// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayVersion); + /// + /// // New help available + /// let err = cmd.try_get_matches_from(["mycmd", "--special-version"]).unwrap_err(); + /// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayVersion); + /// ``` + Version, +} + +impl ArgAction { + /// Returns whether this action accepts values on the command-line + /// + /// [`default_values`][super::Arg::default_values] and [`env`][super::Arg::env] may still be + /// processed. + pub fn takes_values(&self) -> bool { + match self { + Self::Set => true, + Self::Append => true, + Self::SetTrue => false, + Self::SetFalse => false, + Self::Count => false, + Self::Help => false, + Self::Version => false, + } + } + + pub(crate) fn default_value(&self) -> Option<&'static std::ffi::OsStr> { + match self { + Self::Set => None, + Self::Append => None, + Self::SetTrue => Some(std::ffi::OsStr::new("false")), + Self::SetFalse => Some(std::ffi::OsStr::new("true")), + Self::Count => Some(std::ffi::OsStr::new("0")), + Self::Help => None, + Self::Version => None, + } + } + + pub(crate) fn default_missing_value(&self) -> Option<&'static std::ffi::OsStr> { + match self { + Self::Set => None, + Self::Append => None, + Self::SetTrue => Some(std::ffi::OsStr::new("true")), + Self::SetFalse => Some(std::ffi::OsStr::new("false")), + Self::Count => None, + Self::Help => None, + Self::Version => None, + } + } + + pub(crate) fn default_value_parser(&self) -> Option<super::ValueParser> { + match self { + Self::Set => None, + Self::Append => None, + Self::SetTrue => Some(super::ValueParser::bool()), + Self::SetFalse => Some(super::ValueParser::bool()), + Self::Count => Some(crate::value_parser!(u8).into()), + Self::Help => None, + Self::Version => None, + } + } + + #[cfg(debug_assertions)] + pub(crate) fn value_type_id(&self) -> Option<crate::parser::AnyValueId> { + use crate::parser::AnyValueId; + + match self { + Self::Set => None, + Self::Append => None, + Self::SetTrue => None, + Self::SetFalse => None, + Self::Count => Some(AnyValueId::of::<CountType>()), + Self::Help => None, + Self::Version => None, + } + } +} + +pub(crate) type CountType = u8; |