merge underline-style and underline-color into a single table

Author: pascalkuthe

book/src/themes.md

@@ -13,10 +13,10 @@ The default theme.toml can be found [here](https://github.com/helix-editor/helix
 Each line in the theme file is specified as below:
 
 ```toml
-key = { fg = "#ffffff", bg = "#000000", underline-color = "#ff0000", underline-style = "curl", modifiers = ["bold", "italic"] }
+key = { fg = "#ffffff", bg = "#000000", underline = { color = "#ff0000", style = "curl"}, modifiers = ["bold", "italic"] }
 ```
 
-where `key` represents what you want to style, `fg` specifies the foreground color, `bg` the background color, `underline-style` the underline style, `underline-color` the underline color (only meaningful if an underline style is enabled), and `modifiers` is a list of style modifiers. `bg`, `underline` and `modifiers` can be omitted to defer to the defaults.
+where `key` represents what you want to style, `fg` specifies the foreground color, `bg` the background color, `underline` the underline `style`/`color`, and `modifiers` is a list of style modifiers. `bg`, `underline` and `modifiers` can be omitted to defer to the defaults.
 
 To specify only the foreground color:
 
@@ -89,12 +89,12 @@ Less common modifiers might not be supported by your terminal emulator.
 | `hidden`             |
 | `crossed_out`        |
 
-> Note: The `underlined` modifier is deprecated and only available for backwards compatability.
-> Its behaviour is equivalent to `underline-style="line"`.
+> Note: The `underlined` modifier is deprecated and only available for backwards compatibility.
+> Its behavior is equivalent to setting `underline.style="line"`.
 
 ### Underline Style
 
-One of the following values may be used as an `underline-style`. 
+One of the following values may be used as a value for `underline.style`. 
 
 Some styles might not be supported by your terminal emulator.
 

helix-view/src/theme.rs

@@ -268,18 +268,29 @@ impl ThemePalette {
         value
             .as_str()
             .and_then(|s| s.parse().ok())
-            .ok_or(format!("Theme: invalid underline-style: {}", value))
+            .ok_or(format!("Theme: invalid underline style: {}", value))
     }
 
     pub fn parse_style(&self, style: &mut Style, value: Value) -> Result<(), String> {
         if let Value::Table(entries) = value {
-            for (name, value) in entries {
+            for (name, mut value) in entries {
                 match name.as_str() {
                     "fg" => *style = style.fg(self.parse_color(value)?),
                     "bg" => *style = style.bg(self.parse_color(value)?),
-                    "underline-color" => *style = style.underline_color(self.parse_color(value)?),
-                    "underline-style" => {
-                        *style = style.underline_style(Self::parse_underline_style(&value)?)
+                    "underline" => {
+                        let table = value
+                            .as_table_mut()
+                            .ok_or("Theme: underline must be table")?;
+                        if let Some(value) = table.remove("color") {
+                            *style = style.underline_color(self.parse_color(value)?);
+                        }
+                        if let Some(value) = table.remove("style") {
+                            *style = style.underline_style(Self::parse_underline_style(&value)?);
+                        }
+
+                        if let Some(attr) = table.keys().next() {
+                            return Err(format!("Theme: invalid underline attribute: {attr}"));
+                        }
                     }
                     "modifiers" => {
                         let modifiers = value

runtime/themes/dark_plus.toml

@@ -92,8 +92,8 @@
 "info" = { fg = "light_blue" }
 "hint" = { fg = "light_gray3" }
 
-"diagnostic.error" = {underline-color = "red", underline-style = "curl"}
-"diagnostic" = {underline-color = "gold", underline-style = "curl" }
+"diagnostic.error".underline = { color = "red", style = "curl" }
+"diagnostic".underline = { color = "gold", style = "curl" }
 
 [palette]
 white = "#ffffff"

runtime/themes/onedark.toml

@@ -39,10 +39,10 @@
 "diff.delta" = "gold"
 "diff.minus" = "red"
 
-"diagnostic.info" = { underline-color = "blue", underline-style = "curl" }
-"diagnostic.hint" = { underline-color = "green", underline-style = "curl" }
-"diagnostic.warning" = { underline-color = "yellow", underline-style = "curl" }
-"diagnostic.error" = { underline-color = "red", underline-style = "curl" }
+"diagnostic.info".underline = { color = "blue", style = "curl" } 
+"diagnostic.hint".underline = { color = "green", style = "curl" } 
+"diagnostic.warning".underline = { color = "yellow", style = "curl" } 
+"diagnostic.error".underline = { color = "red", style = "curl" } 
 "info" = { fg = "blue", modifiers = ["bold"] }
 "hint" = { fg = "green", modifiers = ["bold"] }
 "warning" = { fg = "yellow", modifiers = ["bold"] }