Use COSMIC syntax theme by default, derived from OneHalf

Cargo.toml

@@ -25,6 +25,9 @@ i18n-embed = { version = "0.13.4", features = ["fluent-system", "desktop-request
 i18n-embed-fl = "0.6.4"
 rust-embed = "6.3.0"
 
+[dependencies.cosmic-syntax-theme]
+git = "https://github.com/pop-os/cosmic-syntax-theme"
+
 [dependencies.cosmic-text]
 git = "https://github.com/pop-os/cosmic-text"
 branch = "refactor"

src/config.rs

@@ -170,8 +170,8 @@ impl Default for Config {
             font_name: "Fira Mono".to_string(),
             font_size: 14,
             line_numbers: true,
-            syntax_theme_dark: "gruvbox-dark".to_string(),
-            syntax_theme_light: "gruvbox-light".to_string(),
+            syntax_theme_dark: "COSMIC Dark".to_string(),
+            syntax_theme_light: "COSMIC Light".to_string(),
             tab_width: 4,
             vim_bindings: false,
             word_wrap: false,

src/main.rs

@@ -19,7 +19,7 @@ use cosmic::{
 use cosmic_text::{Cursor, Edit, Family, FontSystem, Selection, SwashCache, SyntaxSystem, ViMode};
 use std::{
     any::TypeId,
-    env, fs,
+    env, fs, io,
     path::{Path, PathBuf},
     process,
     sync::Mutex,
@@ -66,10 +66,25 @@ lazy_static::lazy_static! {
     static ref SWASH_CACHE: Mutex<SwashCache> = Mutex::new(SwashCache::new());
     static ref SYNTAX_SYSTEM: SyntaxSystem = {
         let lazy_theme_set = two_face::theme::LazyThemeSet::from(two_face::theme::extra());
+        let mut theme_set = syntect::highlighting::ThemeSet::from(&lazy_theme_set);
+        for (theme_name, theme_data) in &[
+            ("COSMIC Dark", cosmic_syntax_theme::COSMIC_DARK_TM_THEME),
+            ("COSMIC Light", cosmic_syntax_theme::COSMIC_LIGHT_TM_THEME)
+        ] {
+            let mut cursor = io::Cursor::new(theme_data);
+            match syntect::highlighting::ThemeSet::load_from_reader(&mut cursor) {
+                Ok(theme) => {
+                    theme_set.themes.insert(theme_name.to_string(), theme);
+                }
+                Err(err) => {
+                    eprintln!("failed to load {:?} syntax theme: {}", theme_name, err);
+                }
+            }
+        }
         SyntaxSystem {
             //TODO: store newlines in buffer
             syntax_set: two_face::syntax::extra_no_newlines(),
-            theme_set: syntect::highlighting::ThemeSet::from(&lazy_theme_set),
+            theme_set,
         }
     };
 }