Add shorthand method for creating a Color from RGB components (#73)

* Add shorthand method for creating a Color from RGB components

Allows an Rgb Color variant to be created as if it was a tuple variant
while maintaining the named fields of the struct type.

Fixes #41

* Changelog entry for new rgb method

Co-authored-by: Mikael Mello <git@mikaelmello.com>

CHANGELOG.md

@@ -1,8 +1,11 @@
 # Changelog
 
 <!-- next-header -->
+
 ## [Unreleased] - ReleaseDate
 
+- Add shorthand method `rgb(r: u8, g: u8, b: u8)` to create a `Color` struct from RGB components. Thanks to @tpoliaw for the PR! [#73](https://github.com/mikaelmello/inquire/pull/73)
+
 ## [0.3.0] - 2022-08-19
 
 ### Breaking Changes
@@ -39,7 +42,7 @@ Input validation, suggestions and completions are now fallible operations.
 
 The return type of validators has been changed to `Result<Validation, CustomUserError>`. This means that validating the input can now be a fallible operation. The docs contain more thorough explanations and full-featured examples.
 
-- Successful executions of the validator  should return a variant of the `Validation` enum, which can be either `Valid` or `Invalid(ErrorMessage)`.
+- Successful executions of the validator should return a variant of the `Validation` enum, which can be either `Valid` or `Invalid(ErrorMessage)`.
 - Unsuccessful executions return a `CustomUserError` type, which is an alias for `Box<dyn std::error::Error + Send + Sync + 'static>`.
 
 The return type of suggesters has also been changed to allow fallible executions. The return type in successful executions continues to be `Vec<String>`, while `CustomUserError` is used with errors.
@@ -193,7 +196,8 @@ The library is already featureful enough to warrant a higher version number, bum
 - Add DateSelect prompt
 
 <!-- next-url -->
-[Unreleased]: https://github.com/mikaelmello/inquire/compare/v0.3.0...HEAD
+
+[unreleased]: https://github.com/mikaelmello/inquire/compare/v0.3.0...HEAD
 [unreleased]: https://github.com/mikaelmello/inquire/compare/v0.2.1...v0.3.0
 [0.2.1]: https://github.com/mikaelmello/inquire/compare/v0.2.0...v0.2.1
 [0.2.0]: https://github.com/mikaelmello/inquire/compare/v0.1.0...v0.2.0

src/ui/color.rs

@@ -153,3 +153,16 @@ pub enum Color {
     /// Supported on all terminal back-ends: `crossterm`, `termion` and `console`.
     AnsiValue(u8),
 }
+
+impl Color {
+    /// Shorthand method for creating a Color from RGB components
+    ///
+    /// ```
+    /// # use inquire::ui::Color;
+    ///
+    /// assert_eq!(Color::rgb(42, 17, 97), Color::Rgb { r: 42, g: 17, b: 97 });
+    /// ```
+    pub fn rgb(r: u8, g: u8, b: u8) -> Color {
+        Color::Rgb { r, g, b }
+    }
+}