feature: support italic text styling (#1514)

Support italics as a text styling option.

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [#1353](https://github.com/ClementTsang/bottom/pull/1353): Support selecting the average CPU graph as a default.
 - [#1430](https://github.com/ClementTsang/bottom/pull/1430): Support controlling the graph legend position for memory and network graph widgets.
 - [#1512](https://github.com/ClementTsang/bottom/pull/1512): Support bold text styling options.
+- [#1514](https://github.com/ClementTsang/bottom/pull/1514): Support italic text styling options.
 
 ### Changes
 
@@ -47,7 +48,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [0.9.7] - 2023-08-26
 
-## Other
+## Bug Fixes
 
 - [#1500](https://github.com/ClementTsang/bottom/issues/1500): Fix builds for Rust 1.80.
 

schema/nightly/bottom.json

@@ -912,6 +912,13 @@
                   "type": "null"
                 }
               ]
+            },
+            "italics": {
+              "description": "Whether to make this text italicized or not. If not set, will default to built-in defaults.",
+              "type": [
+                "boolean",
+                "null"
+              ]
             }
           }
         }

src/options/config/style.rs

@@ -49,6 +49,10 @@ pub(crate) enum TextStyleConfig {
         /// Whether to make this text bolded or not. If not set,
         /// will default to built-in defaults.
         bold: Option<bool>,
+
+        /// Whether to make this text italicized or not. If not set,
+        /// will default to built-in defaults.
+        italics: Option<bool>,
     },
 }
 

src/options/config/style/utils.rs

@@ -148,7 +148,7 @@ macro_rules! set_style {
                             })?
                     );
                 }
-                TextStyleConfig::TextStyle {color, bg_color, bold} => {
+                TextStyleConfig::TextStyle {color, bg_color, bold, italics} => {
                     if let Some(fg) = &color {
                         $palette_field = $palette_field.fg(
                             crate::options::config::style::utils::str_to_colour(&fg.0)
@@ -188,6 +188,14 @@ macro_rules! set_style {
                             $palette_field = $palette_field.remove_modifier(tui::style::Modifier::BOLD);
                         }
                     }
+
+                    if let Some(italics) = &italics {
+                        if *italics {
+                            $palette_field = $palette_field.add_modifier(tui::style::Modifier::ITALIC);
+                        } else {
+                            $palette_field = $palette_field.remove_modifier(tui::style::Modifier::ITALIC);
+                        }
+                    }
                 }
             }
         }
@@ -435,16 +443,19 @@ mod test {
                     color: None,
                     bg_color: None,
                     bold: None,
+                    italics: None,
                 }),
                 text_c: Some(TextStyleConfig::TextStyle {
                     color: Some(ColorStr("magenta".into())),
                     bg_color: Some(ColorStr("255, 255, 255".into())),
                     bold: Some(true),
+                    italics: Some(false),
                 }),
                 text_d: Some(TextStyleConfig::TextStyle {
                     color: Some(ColorStr("#fff".into())),
                     bg_color: Some(ColorStr("1, 1, 1".into())),
                     bold: Some(false),
+                    italics: Some(true),
                 }),
                 text_e: None,
                 bad_color: Some(ColorStr("asdf".into())),
@@ -457,11 +468,13 @@ mod test {
                     color: Some(ColorStr("asdf".into())),
                     bg_color: None,
                     bold: None,
+                    italics: None,
                 }),
                 bad_text_b: Some(TextStyleConfig::TextStyle {
                     color: None,
                     bg_color: Some(ColorStr("asdf".into())),
                     bold: None,
+                    italics: None,
                 }),
             }
         }
@@ -562,11 +575,13 @@ mod test {
         assert_eq!(s.fg.unwrap(), Color::Magenta);
         assert_eq!(s.bg.unwrap(), Color::Rgb(255, 255, 255));
         assert!(s.add_modifier.contains(Modifier::BOLD));
+        assert!(!s.add_modifier.contains(Modifier::ITALIC));
 
         set_style!(s, &dummy.inner, text_d);
         assert_eq!(s.fg.unwrap(), Color::Rgb(255, 255, 255));
         assert_eq!(s.bg.unwrap(), Color::Rgb(1, 1, 1));
-        assert!(s.add_modifier.is_empty());
+        assert!(!s.add_modifier.contains(Modifier::BOLD));
+        assert!(s.add_modifier.contains(Modifier::ITALIC));
 
         Ok(())
     }

tests/valid_configs/styling.toml

@@ -12,6 +12,13 @@ bold = false
 [styles.tables]
 headers = { color = "red", bg_color = "black", bold = true }
 
+# Test italics
+[styles.widgets.widget_title]
+color = "#0f0f0f"
+bg_color = "#f0f0f0"
+bold = true
+italics = true
+
 # Test using normal colour where inline table can also work
 [styles.widgets]
 selected_text = "#fff"