diff --git a/src/app.rs b/src/app.rs index f52b2b5a..5c11762a 100644 --- a/src/app.rs +++ b/src/app.rs @@ -109,6 +109,7 @@ pub struct App<'a, 'v, 'ab, 'u, 'h, 'ar> { needs_short_help: bool, needs_short_version: bool, needs_subcmd_help: bool, + subcmds_neg_reqs: bool, required: HashSet<&'ar str>, short_list: HashSet, long_list: HashSet<&'ar str>, @@ -156,6 +157,7 @@ impl<'a, 'v, 'ab, 'u, 'h, 'ar> App<'a, 'v, 'ab, 'u, 'h, 'ar>{ blacklist: HashSet::new(), bin_name: None, groups: HashMap::new(), + subcmds_neg_reqs: false } } @@ -209,6 +211,25 @@ impl<'a, 'v, 'ab, 'u, 'h, 'ar> App<'a, 'v, 'ab, 'u, 'h, 'ar>{ self } + /// Allows subcommands to override all requirements of the parent (this command). For example + /// if you had a subcommand or even top level application which had a required arguments that + /// is only required if no subcommand is used. + /// + /// **NOTE:** This defaults to false (using subcommand does *not* negate requirements) + /// + /// # Example + /// + /// ```no_run + /// # use clap::App; + /// # let app = App::new("myprog") + /// .subcommands_negate_reqs(true) + /// # .get_matches(); + /// ``` + pub fn subcommands_negate_reqs(mut self, n: bool) -> App<'a, 'v, 'ab, 'u, 'h, 'ar> { + self.subcmds_neg_reqs = n; + self + } + /// Sets a string of the version number to be displayed when displaying version or help /// information. /// @@ -1602,7 +1623,7 @@ impl<'a, 'v, 'ab, 'u, 'h, 'ar> App<'a, 'v, 'ab, 'u, 'h, 'ar>{ self.validate_blacklist(matches); self.validate_num_args(matches); - if !self.required.is_empty() { + if !self.required.is_empty() && !self.subcmds_neg_reqs { if self.validate_required(&matches) { self.report_error(format!("The following required arguments were not \ supplied:{}",