feat: add support custom themes (#672)

Author: antonreshetov

src/main/i18n/locales/en_US/preferences.json

@@ -67,6 +67,12 @@
     "label": "Appearance",
     "theme": {
       "label": "Theme",
+      "builtIn": "Built-in",
+      "custom": "Custom",
+      "themesDir": "Themes Directory",
+      "openDir": "Open Themes Directory",
+      "createTemplate": "Create Theme Template",
+      "dirDescription": "Place your JSON theme files in this folder.",
       "light": "Light",
       "dark": "Dark",
       "system": "System"

src/main/index.ts

@@ -7,6 +7,7 @@ import { initApi } from './api'
 import { startAutoBackup } from './db'
 import { migrateJsonToSqlite } from './db/migrate'
 import { registerIPC } from './ipc'
+import { startThemeWatcher, stopThemeWatcher } from './ipc/handlers/theme'
 import { mainMenu } from './menu/main'
 import { store } from './store'
 import { checkForUpdates } from './updates'
@@ -124,6 +125,13 @@ else {
       log('Error registering IPC', error)
     }
 
+    try {
+      startThemeWatcher()
+    }
+    catch (error) {
+      log('Error starting theme watcher', error)
+    }
+
     try {
       await initApi()
     }
@@ -167,6 +175,7 @@ else {
 
   app.on('before-quit', () => {
     isQuitting = true
+    stopThemeWatcher()
   })
 
   app.on('window-all-closed', () => {