feat(picker): add builtin bool pickable and parselib matcher framework

Add `Pickable` implementation for `bool` and the supporting `Matcher`
trait
with utility functions for argument matching.  Expose `pickable_needed`
and
`matcher_needed` modules for downstream trait implementors.

1 files changed, 15 insertions, 0 deletions

diff --git a/mingling_picker/src/builtin/pick_bool.rs b/mingling_picker/src/builtin/pick_bool.rs
new file mode 100644
index 0000000..ad93a83
--- /dev/null
+++ b/mingling_picker/src/builtin/pick_bool.rs
@@ -0,0 +1,15 @@
+use crate::{parselib::Matcher, pickable_needed::*};
+
+impl<'a> Pickable<'a> for bool {
+    fn get_attr(_: &'a PickerFlag<'a, Self>) -> PickerFlagAttr {
+        PickerFlagAttr::Flag
+    }
+
+    fn tag(ctx: TagPhaseContext) -> Vec<usize> {
+        <bool as Matcher>::match_all(ctx.into())
+    }
+
+    fn pick(raw_strs: &[&str]) -> PickerArgResult<Self> {
+        PickerArgResult::Parsed(!raw_strs.is_empty())
+    }
+}