feat: move OSC94 under its own module and add confirmer predicates

Extract OSC94 state and guard types from `res` into a dedicated
`osc94` module, and add `ConfirmerCount` and `ConfirmerPredicate`
types with `YesConfirm` and `TrueConfirm` implementations.

1 files changed, 31 insertions, 0 deletions

diff --git a/mingling/src/confirm/count.rs b/mingling/src/confirm/count.rs
new file mode 100644
index 0000000..b9753c2
--- /dev/null
+++ b/mingling/src/confirm/count.rs
@@ -0,0 +1,31 @@
+/// Specifies the maximum number of attempts for a confirmation prompt.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ConfirmerCount {
+    /// Loop indefinitely until the user gives a parseable answer.
+    Loop,
+    /// Ask at most the specified number of times.
+    Max(usize),
+}
+
+macro_rules! impl_from_for_confirmer_count {
+    ($($t:ty),*) => {
+        $(
+            impl From<$t> for ConfirmerCount {
+                fn from(n: $t) -> Self {
+                    if n == 0 {
+                        ConfirmerCount::Loop
+                    } else {
+                        match usize::try_from(n) {
+                            Ok(max) => ConfirmerCount::Max(max),
+                            Err(_) => ConfirmerCount::Max(usize::MAX),
+                        }
+                    }
+                }
+            }
+        )*
+    };
+}
+
+impl_from_for_confirmer_count!(
+    i8, i16, i32, i64, i128, isize, u8, u16, u32, u64, u128, usize
+);