Added custom themes, import/export option with json (#159)

Reviewed-on: https://codeberg.org/ArkHost/HelixNotes/pulls/159

src-tauri/my-theme.json

@@ -0,0 +1,21 @@
+{
+  "themes": [
+    {
+      "colors": {
+        "bg_active": "#373a52",
+        "bg_editor": "#1a1b26",
+        "bg_hover": "#2f3145",
+        "bg_primary": "#1a1b26",
+        "bg_secondary": "#1f2029",
+        "bg_tertiary": "#2a2b3d",
+        "border_color": "#2f3145",
+        "text_primary": "#c8cde4",
+        "text_secondary": "#6b7094"
+      },
+      "id": "custom-1782146306429",
+      "is_dark": true,
+      "name": "My theme"
+    }
+  ],
+  "version": 1
+}

src-tauri/src/commands.rs

@@ -90,6 +90,58 @@ pub fn set_accent_color(state: State<'_, AppState>, color: String) -> Result<(),
     Ok(())
 }
 
+#[tauri::command]
+pub fn save_custom_theme(state: State<'_, AppState>, theme: crate::types::CustomTheme) -> Result<(), String> {
+    let mut config = state.config.lock().map_err(|e| e.to_string())?;
+    if let Some(pos) = config.custom_themes.iter().position(|t| t.id == theme.id) {
+        config.custom_themes[pos] = theme;
+    } else {
+        config.custom_themes.push(theme);
+    }
+    save_app_config(&config)?;
+    Ok(())
+}
+
+#[tauri::command]
+pub fn delete_custom_theme(state: State<'_, AppState>, id: String) -> Result<(), String> {
+    let mut config = state.config.lock().map_err(|e| e.to_string())?;
+    config.custom_themes.retain(|t| t.id != id);
+    if config.theme == id {
+        config.theme = "system".to_string();
+    }
+    save_app_config(&config)?;
+    Ok(())
+}
+
+#[tauri::command]
+pub fn export_custom_theme(state: State<'_, AppState>, id: String, path: String) -> Result<(), String> {
+    let config = state.config.lock().map_err(|e| e.to_string())?;
+    let theme = config.custom_themes.iter().find(|t| t.id == id)
+        .ok_or_else(|| "Theme not found".to_string())?;
+    let export = serde_json::json!({ "version": 1, "themes": [theme] });
+    let data = serde_json::to_string_pretty(&export).map_err(|e| e.to_string())?;
+    std::fs::write(&path, data).map_err(|e| e.to_string())?;
+    Ok(())
+}
+
+#[tauri::command]
+pub fn import_custom_themes(state: State<'_, AppState>, path: String) -> Result<Vec<crate::types::CustomTheme>, String> {
+    let data = std::fs::read_to_string(&path).map_err(|e| e.to_string())?;
+    let parsed: serde_json::Value = serde_json::from_str(&data).map_err(|e| e.to_string())?;
+    let themes: Vec<crate::types::CustomTheme> = serde_json::from_value(parsed["themes"].clone())
+        .map_err(|e| format!("Invalid theme file: {}", e))?;
+    let mut config = state.config.lock().map_err(|e| e.to_string())?;
+    for theme in &themes {
+        if let Some(pos) = config.custom_themes.iter().position(|t| t.id == theme.id) {
+            config.custom_themes[pos] = theme.clone();
+        } else {
+            config.custom_themes.push(theme.clone());
+        }
+    }
+    save_app_config(&config)?;
+    Ok(themes)
+}
+
 #[tauri::command]
 pub fn set_font_size(state: State<'_, AppState>, size: u32) -> Result<(), String> {
     let mut config = state.config.lock().map_err(|e| e.to_string())?;

src-tauri/src/lib.rs

@@ -116,6 +116,10 @@ pub fn run() {
             commands::get_app_config,
             commands::set_theme,
             commands::set_accent_color,
+            commands::save_custom_theme,
+            commands::delete_custom_theme,
+            commands::export_custom_theme,
+            commands::import_custom_themes,
             commands::set_font_size,
             commands::set_font_family,
             commands::set_line_height,

src-tauri/src/types.rs

@@ -56,6 +56,27 @@ pub struct VaultConfig {
     pub name: String,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CustomThemeColors {
+    pub bg_primary: String,
+    pub bg_secondary: String,
+    pub bg_tertiary: String,
+    pub bg_hover: String,
+    pub bg_active: String,
+    pub bg_editor: String,
+    pub text_primary: String,
+    pub text_secondary: String,
+    pub border_color: String,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CustomTheme {
+    pub id: String,
+    pub name: String,
+    pub is_dark: bool,
+    pub colors: CustomThemeColors,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct AppConfig {
     pub vaults: Vec<VaultConfig>,
@@ -168,6 +189,8 @@ pub struct AppConfig {
     pub sync_interval_minutes: u32,
     #[serde(default)]
     pub last_sync_time: Option<String>,
+    #[serde(default)]
+    pub custom_themes: Vec<CustomTheme>,
 }
 
 fn default_true() -> bool {
@@ -265,6 +288,7 @@ impl Default for AppConfig {
             sync_on_change: false,
             sync_interval_minutes: 0,
             last_sync_time: None,
+            custom_themes: Vec::new(),
         }
     }
 }