chore: checkpoint before Python removal

vendor/option-ext/src/impl.rs

@@ -0,0 +1,20 @@
+use OptionExt;
+
+impl<T> OptionExt<T> for Option<T> {
+    fn contains<U>(&self, x: &U) -> bool where U: PartialEq<T> {
+        match *self {
+            Some(ref y) => x == y,
+            None => false,
+        }
+    }
+
+    #[inline]
+    fn map_or2<U, F: FnOnce(T) -> U>(self, f: F, default: U) -> U {
+        self.map_or(default, f)
+    }
+
+    #[inline]
+    fn map_or_else2<U, F: FnOnce(T) -> U, D: FnOnce() -> U>(self, f: F, default: D) -> U {
+        self.map_or_else(default, f)
+    }
+}

vendor/option-ext/src/lib.rs

@@ -0,0 +1,71 @@
+mod r#impl;
+
+/// Extension trait providing additional methods for `Option`.
+pub trait OptionExt<T> {
+    /// Returns `true` if the option is a [`Some`] value containing the given value.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use option_ext::OptionExt;
+    ///
+    /// let x: Option<u32> = Some(2);
+    /// assert_eq!(x.contains(&2), true);
+    ///
+    /// let x: Option<u32> = Some(3);
+    /// assert_eq!(x.contains(&2), false);
+    ///
+    /// let x: Option<u32> = None;
+    /// assert_eq!(x.contains(&2), false);
+    /// ```
+    #[must_use]
+    fn contains<U>(&self, x: &U) -> bool where U: PartialEq<T>;
+
+    /// Returns the result from applying the function to the contained value if the option is [`Some`],
+    /// or returns provided default result if the option is [`None`].
+    ///
+    /// The `f` argument of `map_or2` is only evaluated  if the option is [`Some`].
+    /// The default argument of `map_or2` is always evaluated – even if the option is [`Some`].
+    /// Use [`map_or_else2`] to avoid this.
+    ///
+    /// [`map_or_else2`]: OptionExt::map_or_else2
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use option_ext::OptionExt;
+    ///
+    /// let x = Some("bar");
+    /// assert_eq!(x.map_or2(|v| v.len(), 42), 3);
+    ///
+    /// let x: Option<&str> = None;
+    /// assert_eq!(x.map_or2(|v| v.len(), 42), 42);
+    /// ```
+    #[must_use]
+    fn map_or2<U, F: FnOnce(T) -> U>(self, f: F, default: U) -> U;
+
+    /// Returns the result from applying the function to the contained value if the option is [`Some`],
+    /// or returns the result from evaluating the provided default function if the option is [`None`].
+    ///
+    /// The `f` argument of `map_or_else2` is only evaluated  if the option is [`Some`].
+    /// The default argument of `map_or_else2` is only evaluated if the option is [`None`].
+    /// Use [`map_or2`] to always evaluate the default argument.
+    ///
+    /// [`map_or2`]: OptionExt::map_or2
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use option_ext::OptionExt;
+    ///
+    /// let k = 23;
+    ///
+    /// let x = Some("bar");
+    /// assert_eq!(x.map_or_else2(|v| v.len(), || 2 * k), 3);
+    ///
+    /// let x: Option<&str> = None;
+    /// assert_eq!(x.map_or_else2(|v| v.len(), || 2 * k), 46);
+    /// ```
+    #[must_use]
+    fn map_or_else2<U, F: FnOnce(T) -> U, D: FnOnce() -> U>(self, f: F, default: D) -> U;
+}