feat(settings): add app settings initializer and state loader

relates to #35

.gitignore

@@ -4,4 +4,5 @@
 project.wbp
 characters.txt
 session.wbs
+settings.cfg
 default.wbp

src/main/kotlin/com/github/xetra11/ck3workbench/app/AppInitializer.kt

@@ -27,8 +27,8 @@ class AppInitializer(
     }
 
     private fun initializeSettings() {
-        val settingsFile = File("settings.cfg")
-        settingsFile.createNewFile()
+        SettingsHolder.init()
+        SettingsHolder.loadToHolder()
     }
 
     private fun initializeSession() {

src/main/kotlin/com/github/xetra11/ck3workbench/app/SettingsHolder.kt

@@ -3,16 +3,54 @@ package com.github.xetra11.ck3workbench.app
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import java.nio.file.Paths
 
 /**
  * Holds all the app wide settings state
  */
 object SettingsHolder {
     var autosave by mutableStateOf(false)
 
+    /**
+     * Creates 'settings.cfg' if non exists
+     */
+    fun init() {
+        val settingsFile = Paths.get("settings.cfg").toAbsolutePath().toFile()
+        if (!settingsFile.exists()) {
+            AppSettings().save()
+        }
+    }
+
+    /**
+     * Convert holder state into [AppSettings] instance
+     * @return Instance of [AppSettings] containing the holder state
+     */
     fun toAppSettings(): AppSettings {
         return AppSettings(
             autosave = autosave
         )
     }
+
+    /**
+     * Load settings from 'settings.cfg' file from filesystem
+     * @return Instance of [AppSettings] from settings.cfg file
+     */
+    fun load(): AppSettings {
+        val settingsFile = Paths.get("settings.cfg").toAbsolutePath().toFile()
+        if (!settingsFile.exists()) {
+            NotificationsService.error("No settings.cfg could be found. Returning default settings")
+            return AppSettings()
+        }
+        return Json.decodeFromString<AppSettings>(settingsFile.readText())
+    }
+
+    /**
+     * Load settings from 'settings.cfg' file from filesystem and initialize [SettingsHolder] with it
+     */
+    fun loadToHolder() {
+        val appSettings = this.load()
+        this.autosave = appSettings.autosave
+    }
 }

src/test/kotlin/com/github/xetra11/ck3workbench/app/AppInitializerTest.kt

@@ -72,6 +72,15 @@ class AppInitializerTest : ShouldSpec({
 
         file.exists() shouldBe true
     }
+
+    should("load settings and set to SettingsHolder") {
+        val expected = AppSettings(true)
+        expected.save()
+
+        appInitializer.initialize()
+
+        SettingsHolder.toAppSettings() shouldBe expected
+    }
 })
 
 private fun deleteTestFiles() {

src/test/kotlin/com/github/xetra11/ck3workbench/app/AppShutdownServiceTest.kt

@@ -4,7 +4,6 @@ import com.github.xetra11.ck3workbench.app.project.Project
 import com.github.xetra11.ck3workbench.app.project.save
 import io.kotest.core.spec.style.ShouldSpec
 import io.kotest.matchers.shouldBe
-import kotlinx.coroutines.async
 import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.json.Json
 import java.io.File
@@ -56,8 +55,7 @@ class AppShutdownServiceTest : ShouldSpec({
         SettingsHolder.autosave = true
         val settingsFile = File("settings.cfg")
         val expectedSettings = AppSettings(autosave = true)
-        val createdFile = async { settingsFile.createNewFile() }
-        createdFile.await()
+        settingsFile.createNewFile()
 
         appShutdownService.shutdown()