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Merge pull request #3774 from epage/action
feat(builder): Expose ArgAction
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,8 +1,135 @@ | ||
| /// Behavior of arguments when they are encountered while parsing | ||
| #[derive(Clone, Debug, PartialEq, Eq)] | ||
| pub(crate) enum ArgAction { | ||
| /// | ||
| /// # Examples | ||
| /// | ||
| /// ```rust | ||
| /// # use clap::Command; | ||
| /// # use clap::Arg; | ||
| /// let cmd = Command::new("mycmd") | ||
| /// .arg( | ||
| /// Arg::new("special-help") | ||
| /// .short('?') | ||
| /// .action(clap::builder::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] | ||
| /// | ||
| /// # Examples | ||
| /// | ||
| /// ```rust | ||
| /// # use clap::Command; | ||
| /// # use clap::Arg; | ||
| /// let cmd = Command::new("mycmd") | ||
| /// .arg( | ||
| /// Arg::new("flag") | ||
| /// .long("flag") | ||
| /// .action(clap::builder::ArgAction::StoreValue) | ||
| /// ); | ||
| /// | ||
| /// let matches = cmd.try_get_matches_from(["mycmd", "--flag", "value"]).unwrap(); | ||
| /// assert!(matches.is_present("flag")); | ||
| /// assert_eq!(matches.occurrences_of("flag"), 1); | ||
| /// assert_eq!( | ||
| /// matches.get_many::<String>("flag").unwrap_or_default().map(|v| v.as_str()).collect::<Vec<_>>(), | ||
| /// vec!["value"] | ||
| /// ); | ||
| /// ``` | ||
| StoreValue, | ||
| Flag, | ||
| /// When encountered, increment [`ArgMatches::occurrences_of`][crate::ArgMatches::occurrences_of] | ||
| /// | ||
| /// No value is allowed | ||
| /// | ||
| /// # Examples | ||
| /// | ||
| /// ```rust | ||
| /// # use clap::Command; | ||
| /// # use clap::Arg; | ||
| /// let cmd = Command::new("mycmd") | ||
| /// .arg( | ||
| /// Arg::new("flag") | ||
| /// .long("flag") | ||
| /// .multiple_occurrences(true) | ||
| /// .action(clap::builder::ArgAction::IncOccurrence) | ||
| /// ); | ||
| /// | ||
| /// let matches = cmd.try_get_matches_from(["mycmd", "--flag", "--flag"]).unwrap(); | ||
| /// assert!(matches.is_present("flag")); | ||
| /// assert_eq!(matches.occurrences_of("flag"), 2); | ||
| /// assert_eq!(matches.get_many::<String>("flag").unwrap_or_default().count(), 0); | ||
| /// ``` | ||
| IncOccurrence, | ||
| /// When encountered, display [`Command::print_help`][super::App::print_help] | ||
| /// | ||
| /// Depending on the flag, [`Command::print_long_help`][super::App::print_long_help] may be shown | ||
| /// | ||
| /// # Examples | ||
| /// | ||
| /// ```rust | ||
| /// # use clap::Command; | ||
| /// # use clap::Arg; | ||
| /// let cmd = Command::new("mycmd") | ||
| /// .arg( | ||
| /// Arg::new("special-help") | ||
| /// .short('?') | ||
| /// .action(clap::builder::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::App::version] | ||
| /// | ||
| /// Depending on the flag, [`Command::long_version`][super::App::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::builder::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 { | ||
| pub(crate) fn takes_value(&self) -> bool { | ||
| match self { | ||
| Self::StoreValue => true, | ||
| Self::IncOccurrence => false, | ||
| Self::Help => false, | ||
| Self::Version => false, | ||
| } | ||
| } | ||
| } |
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