feat(config): Add support for inverted token in style strings (#2589)

* Add support for `reverse` keyword in style strings

* Duplicate test case and keep original

* Rename keyword to `inverted`

* Add explanatory sentence in readme

docs/advanced-config/README.md

@@ -92,12 +92,13 @@ Style strings are a list of words, separated by whitespace. The words are not ca
   - `bold`
   - `underline`
   - `dimmed`
+  - `inverted`
   - `bg:<color>`
   - `fg:<color>`
   - `<color>`
   - `none`
 
-where `<color>` is a color specifier (discussed below). `fg:<color>` and `<color>` currently do the same thing , though this may change in the future. The order of words in the string does not matter.
+where `<color>` is a color specifier (discussed below). `fg:<color>` and `<color>` currently do the same thing, though this may change in the future. `inverted` swaps the background and foreground colors. The order of words in the string does not matter.
 
 The `none` token overrides all other tokens in a string if it is not part of a `bg:` specifier, so that e.g. `fg:red none fg:blue` will still create a string with no styling. `bg:none` sets the background to the default color so `fg:red bg:none` is equivalent to `red` or `fg:red` and `bg:green fg:red bg:none` is also equivalent to `fg:red` or `red`. It may become an error to use `none` in conjunction with other tokens in the future.
 

src/config.rs

@@ -359,6 +359,7 @@ impl StarshipConfig {
  - 'underline'
  - 'bold'
  - 'italic'
+ - 'inverted'
  - '<color>'       (see the parse_color_string doc for valid color strings)
 */
 pub fn parse_style_string(style_string: &str) -> Option<ansi_term::Style> {
@@ -383,6 +384,7 @@ pub fn parse_style_string(style_string: &str) -> Option<ansi_term::Style> {
                     "bold" => Some(style.bold()),
                     "italic" => Some(style.italic()),
                     "dimmed" => Some(style.dimmed()),
+                    "inverted" => Some(style.reverse()),
                     // When the string is supposed to be a color:
                     // Decide if we yield none, reset background or set color.
                     color_string => {
@@ -675,7 +677,7 @@ mod tests {
     }
 
     #[test]
-    fn table_get_styles_bold_italic_underline_green_dimmy_silly_caps() {
+    fn table_get_styles_bold_italic_underline_green_dimmed_silly_caps() {
         let config = Value::from("bOlD ItAlIc uNdErLiNe GrEeN diMMeD");
         let mystyle = <Style>::from_config(&config).unwrap();
         assert!(mystyle.is_bold);
@@ -693,6 +695,27 @@ mod tests {
         );
     }
 
+    #[test]
+    fn table_get_styles_bold_italic_underline_green_dimmed_inverted_silly_caps() {
+        let config = Value::from("bOlD ItAlIc uNdErLiNe GrEeN diMMeD InVeRTed");
+        let mystyle = <Style>::from_config(&config).unwrap();
+        assert!(mystyle.is_bold);
+        assert!(mystyle.is_italic);
+        assert!(mystyle.is_underline);
+        assert!(mystyle.is_dimmed);
+        assert!(mystyle.is_reverse);
+        assert_eq!(
+            mystyle,
+            ansi_term::Style::new()
+                .bold()
+                .italic()
+                .underline()
+                .dimmed()
+                .reverse()
+                .fg(Color::Green)
+        );
+    }
+
     #[test]
     fn table_get_styles_plain_and_broken_styles() {
         // Test a "plain" style with no formatting