1 files changed, 60 insertions, 0 deletions
diff --git a/mingling/src/confirm/predicate.rs b/mingling/src/confirm/predicate.rs
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+/// Defines how to parse user confirmation input.
+///
+/// A type implementing this trait determines which user input strings are treated as "yes" or "no".
+pub trait ConfirmerPredicate {
+    /// Parses the user's input string, returning whether it is "yes".
+    ///
+    /// Returns `Some(true)` for yes, `Some(false)` for no,
+    /// and `None` if the input cannot be parsed (requiring re-entry).
+    fn is_yes(str: &str) -> Option<bool>;
+}
+
+/// A `ConfirmerPredicate` implementation that accepts "y"/"yes" as yes and "n"/"no" as no.
+///
+/// Input comparison is case-insensitive and automatically trims leading/trailing whitespace.
+///
+/// # Examples
+///
+/// ```
+/// use mingling::res::Confirmer;
+/// use mingling::confirm::YesConfirm;
+///
+/// let confirmer = Confirmer::default();
+/// let confirmed = confirmer.ask::<YesConfirm>("Continue? [y/n] ");
+/// ```
+pub struct YesConfirm;
+
+/// A `ConfirmerPredicate` implementation that accepts "true"/"t" as yes and "false"/"f" as no.
+///
+/// Input comparison is case-insensitive and automatically trims leading/trailing whitespace.
+///
+/// # Examples
+///
+/// ```
+/// use mingling::res::Confirmer;
+/// use mingling::confirm::TrueConfirm;
+///
+/// let confirmer = Confirmer::default();
+/// let confirmed = confirmer.ask::<TrueConfirm>("Enable this feature? [true/false] ");
+/// ```
+pub struct TrueConfirm;
+
+impl ConfirmerPredicate for YesConfirm {
+    fn is_yes(str: &str) -> Option<bool> {
+        match str.trim().to_lowercase().as_str() {
+            "y" | "yes" => Some(true),
+            "n" | "no" => Some(false),
+            _ => None,
+        }
+    }
+}
+
+impl ConfirmerPredicate for TrueConfirm {
+    fn is_yes(str: &str) -> Option<bool> {
+        match str.trim().to_lowercase().as_str() {
+            "true" | "t" => Some(true),
+            "false" | "f" => Some(false),
+            _ => None,
+        }
+    }
+}