Extract source api from app module (#8014)

* Extract source api from app module

* Extract source online api from app module

app/src/main/java/eu/kanade/tachiyomi/source/SourceExtensions.kt

@@ -0,0 +1,31 @@
+package eu.kanade.tachiyomi.source
+
+import android.graphics.drawable.Drawable
+import eu.kanade.domain.source.model.SourceData
+import eu.kanade.tachiyomi.data.preference.PreferencesHelper
+import eu.kanade.tachiyomi.extension.ExtensionManager
+import uy.kohesive.injekt.Injekt
+import uy.kohesive.injekt.api.get
+
+fun Source.icon(): Drawable? = Injekt.get<ExtensionManager>().getAppIconForSource(this)
+
+fun Source.getPreferenceKey(): String = "source_$id"
+
+fun Source.toSourceData(): SourceData = SourceData(id = id, lang = lang, name = name)
+
+fun Source.getNameForMangaInfo(): String {
+    val preferences = Injekt.get<PreferencesHelper>()
+    val enabledLanguages = preferences.enabledLanguages().get()
+        .filterNot { it in listOf("all", "other") }
+    val hasOneActiveLanguages = enabledLanguages.size == 1
+    val isInEnabledLanguages = lang in enabledLanguages
+    return when {
+        // For edge cases where user disables a source they got manga of in their library.
+        hasOneActiveLanguages && !isInEnabledLanguages -> toString()
+        // Hide the language tag when only one language is used.
+        hasOneActiveLanguages && isInEnabledLanguages -> name
+        else -> toString()
+    }
+}
+
+fun Source.isLocalOrStub(): Boolean = id == LocalSource.ID || this is SourceManager.StubSource