Use CommonMain for presentation, use Klock date/format library

core/build.gradle.kts

@@ -48,6 +48,7 @@ kotlin {
                 api(libs.multiplatformSettings.coroutines)
                 api(libs.multiplatformSettings.serialization)
                 api(libs.locale)
+                api(libs.klock)
             }
         }
         val commonTest by getting {

core/src/commonMain/kotlin/ca/gosyer/core/io/FileSystems.kt

@@ -8,4 +8,5 @@ package ca.gosyer.core.io
 
 import okio.FileSystem
 
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER")
 expect val FileSystem.Companion.SYSTEM: FileSystem

core/src/commonMain/kotlin/ca/gosyer/core/lang/Dispatchers.kt

@@ -9,4 +9,5 @@ package ca.gosyer.core.lang
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.Dispatchers
 
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER")
 expect val Dispatchers.IO: CoroutineDispatcher

core/src/commonMain/kotlin/ca/gosyer/core/lang/Locale.kt

@@ -9,3 +9,9 @@ package ca.gosyer.core.lang
 import io.fluidsonic.locale.Locale
 
 expect fun Locale.Companion.getDefault(): Locale
+
+expect fun Locale.getDisplayLanguage(displayLocale: Locale): String
+
+expect fun Locale.getDisplayName(displayLocale: Locale): String
+
+expect val Locale.displayName: String

core/src/commonMain/kotlin/ca/gosyer/core/lang/String.kt

@@ -6,6 +6,8 @@
 
 package ca.gosyer.core.lang
 
+import io.fluidsonic.locale.Locale
+
 /**
  * Replaces the given string to have at most [count] characters using [replacement] at its end.
  * If [replacement] is longer than [count] an exception will be thrown when `length > count`.
@@ -17,3 +19,9 @@ fun String.chop(count: Int, replacement: String = "…"): String {
         this
     }
 }
+
+expect fun String.uppercase(locale: Locale): String
+
+expect fun String.lowercase(locale: Locale): String
+
+expect fun Char.titlecase(locale: Locale): String

core/src/jvmMain/kotlin/ca/gosyer/core/lang/JvmLocale.kt

@@ -8,6 +8,15 @@ package ca.gosyer.core.lang
 
 import io.fluidsonic.locale.Locale
 import io.fluidsonic.locale.toCommon
+import io.fluidsonic.locale.toPlatform
 import java.util.Locale as PlatformLocale
 
 actual fun Locale.Companion.getDefault(): Locale = PlatformLocale.getDefault().toCommon()
+
+actual fun Locale.getDisplayLanguage(displayLocale: Locale): String = toPlatform()
+    .getDisplayLanguage(displayLocale.toPlatform())
+
+actual fun Locale.getDisplayName(displayLocale: Locale): String = toPlatform()
+    .getDisplayName(displayLocale.toPlatform())
+
+actual val Locale.displayName get() = toPlatform().displayName

core/src/jvmMain/kotlin/ca/gosyer/core/lang/JvmString.kt

@@ -7,7 +7,15 @@
 
 package ca.gosyer.core.lang
 
-import java.util.Locale
+import io.fluidsonic.locale.Locale
+import io.fluidsonic.locale.toPlatform
 
 fun String.capitalize(locale: Locale = Locale.getDefault()) =
     replaceFirstChar { if (it.isLowerCase()) it.titlecase(locale) else it.toString() }
+
+
+actual fun String.uppercase(locale: Locale): String = uppercase(locale.toPlatform())
+
+actual fun String.lowercase(locale: Locale): String = lowercase(locale.toPlatform())
+
+actual fun Char.titlecase(locale: Locale): String = titlecase(locale.toPlatform())