Add support for detecting the system theme

src/main/kotlin/ca/gosyer/data/ui/model/ThemeMode.kt

@@ -10,7 +10,7 @@ import kotlinx.serialization.Serializable
 
 @Serializable
 enum class ThemeMode {
-    /*System,*/
+    System,
     Light,
     Dark,
 }

src/main/kotlin/ca/gosyer/ui/base/theme/AppTheme.kt

@@ -7,6 +7,7 @@
 package ca.gosyer.ui.base.theme
 
 import androidx.compose.desktop.DesktopMaterialTheme
+import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.material.Colors
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
@@ -83,11 +84,11 @@ private class AppThemeViewModel @Inject constructor(
         }
 
         return when (themeMode) {
-            /*ThemeMode.System -> if (!isSystemInDarkTheme()) {
-              getTheme(lightTheme, true)
+            ThemeMode.System -> if (!isSystemInDarkTheme()) {
+                getTheme(lightTheme, true)
             } else {
-              getTheme(darkTheme, false)
-            }*/
+                getTheme(darkTheme, false)
+            }
             ThemeMode.Light -> getTheme(lightTheme, true)
             ThemeMode.Dark -> getTheme(darkTheme, false)
         }

src/main/kotlin/ca/gosyer/ui/main/main.kt

@@ -46,6 +46,8 @@ import com.github.zsoltk.compose.savedinstancestate.Bundle
 import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.flow.launchIn
+import org.jetbrains.skiko.SystemTheme
+import org.jetbrains.skiko.currentSystemTheme
 import toothpick.configuration.Configuration
 import toothpick.ktp.KTP
 import toothpick.ktp.extension.getInstance
@@ -98,6 +100,10 @@ suspend fun main() {
                 return@getAsFlow
             }
             val theme = when (it) {
+                ThemeMode.System -> when (currentSystemTheme) {
+                    SystemTheme.LIGHT, SystemTheme.UNKNOWN -> IntelliJTheme()
+                    SystemTheme.DARK -> DarculaTheme()
+                }
                 ThemeMode.Light -> IntelliJTheme()
                 ThemeMode.Dark -> DarculaTheme()
             }

src/main/kotlin/ca/gosyer/ui/settings/SettingsAppearanceScreen.kt

@@ -83,7 +83,7 @@ fun SettingsAppearance(navController: BackStack<Route>) {
                 ChoicePreference(
                     preference = vm.themeMode,
                     choices = mapOf(
-                        // ThemeMode.System to R.string.follow_system_settings,
+                        ThemeMode.System to stringResource("theme_follow_system"),
                         ThemeMode.Light to stringResource("theme_light"),
                         ThemeMode.Dark to stringResource("theme_dark")
                     ),

src/main/resources/values/values/strings.xml

@@ -110,6 +110,7 @@
 
     <!-- Appearance Settings -->
     <string name="theme">Theme</string>
+    <string name="theme_follow_system">Follow system settings</string>
     <string name="theme_light">Light</string>
     <string name="theme_dark">Dark</string>
     <string name="theme_text">Text</string>