Parse hex colors in themes (#647)

Just delegate to the default deserializer of crossterm which learned
dealing with hex color in version 0.27.0.

Cargo.toml

@@ -21,7 +21,7 @@ clap_complete = "4.1"
 version_check = "0.9.*"
 
 [dependencies]
-crossterm = { version = "0.24.0", features = ["serde"] }
+crossterm = { version = "0.27.0", features = ["serde"] }
 dirs = "3.0.*"
 libc = "0.2.*"
 human-sort = "0.2.2"

src/theme/color.rs

@@ -1,7 +1,7 @@
 ///! This module provides methods to create theme from files and operations related to
 ///! this.
 use crossterm::style::Color;
-use serde::Deserialize;
+use serde::{de::IntoDeserializer, Deserialize};
 use std::fmt;
 
 // Custom color deserialize
@@ -23,8 +23,7 @@ where
         where
             E: serde::de::Error,
         {
-            Color::try_from(value)
-                .map_err(|_| E::invalid_value(serde::de::Unexpected::Str(value), &self))
+            Color::deserialize(value.into_deserializer())
         }
 
         fn visit_u64<E>(self, value: u64) -> Result<Color, E>
@@ -470,6 +469,21 @@ tree-edge: 245
         assert_eq!(empty_theme, theme);
     }
 
+    #[test]
+    fn test_hexadecimal_colors() {
+        // Must contain one field at least
+        // ref https://github.com/dtolnay/serde-yaml/issues/86
+        let empty_theme: ColorTheme = Theme::with_yaml("user: \"#ff007f\"").unwrap();
+        assert_eq!(
+            empty_theme.user,
+            crossterm::style::Color::Rgb {
+                r: 255,
+                g: 0,
+                b: 127
+            }
+        );
+    }
+
     #[test]
     fn test_second_level_theme_return_default_but_changed() {
         // Must contain one field at least