Add KMP locale API for SubtitleHelper

library/src/androidMain/kotlin/com/lagradost/cloudstream3/utils/SubtitleHelperPlatform.android.kt

@@ -0,0 +1,24 @@
+package com.lagradost.cloudstream3.utils
+
+import java.util.Locale
+
+// TODO: add androidMain actual using LocaleListCompat.getAdjustedDefault() to respect
+// per-app language preferences set via AppCompatDelegate.setApplicationLocales()
+
+actual fun getCurrentLocale(): String =
+    Locale.getDefault().toLanguageTag()
+
+actual fun localizedLanguageName(ietfTag: String, localizedTo: String): String? {
+    val localeOfLangCode = Locale.forLanguageTag(ietfTag)
+    val localeOfLocalizeTo = Locale.forLanguageTag(localizedTo)
+    val displayName = localeOfLangCode.getDisplayName(localeOfLocalizeTo)
+
+    // Locale.getDisplayName() falls back to the raw tag or "language (country)" form
+    // when it doesn't know how to render the name.
+    val langCodeWithCountry = "${localeOfLangCode.language} ("
+    val failed =
+        displayName.equals(ietfTag, ignoreCase = true) ||
+        displayName.contains(langCodeWithCountry, ignoreCase = true)
+
+    return if (failed) null else displayName
+}

library/src/commonMain/kotlin/com/lagradost/cloudstream3/utils/SubtitleHelper.kt

@@ -1,13 +1,6 @@
 package com.lagradost.cloudstream3.utils
 
 import me.xdrop.fuzzywuzzy.FuzzySearch
-import java.util.Locale
-
-// If you find a way to use SettingsGeneral getCurrentLocale()
-// instead of this function do it.
-fun getCurrentLocale(): String {
-    return Locale.getDefault().toLanguageTag()
-}
 
 @Suppress(
     "unused",
@@ -48,23 +41,10 @@ object SubtitleHelper {
         val ISO_639_3: String,      // ISO 639-6 missing as it's intended to differentiate specific dialects and variants
         val openSubtitles: String, // inconsistent codes that do not conform ISO 639
     ) {
-        fun localizedName(localizedTo: String? = null): String {
-            // Use system locale to localize language name
-            val localeOfLangCode = Locale.forLanguageTag(this.IETF_tag)
-            val localeOfLocalizeTo = Locale.forLanguageTag(localizedTo ?: getCurrentLocale())
-            val sysLocalizedName = localeOfLangCode.getDisplayName(localeOfLocalizeTo)
-
-            val langCodeWithCountry = "${localeOfLangCode.language} (" // ${localeOfLangCode.country})"
-            val failedToLocalize =
-                sysLocalizedName.equals(this.IETF_tag, ignoreCase = true) ||
-                sysLocalizedName.contains(langCodeWithCountry, ignoreCase = true)
-
-            return if (failedToLocalize)
+        fun localizedName(localizedTo: String? = null): String =
+            localizedLanguageName(this.IETF_tag, localizedTo ?: getCurrentLocale())
                 // fallback to native language name
-                this.nativeName
-            else
-                sysLocalizedName
-        }
+                ?: this.nativeName
 
         fun nameNextToFlagEmoji(localizedTo: String? = null): String {
             // fallback to [A][A] -> [?] question mak flag

library/src/commonMain/kotlin/com/lagradost/cloudstream3/utils/SubtitleHelperPlatform.kt

@@ -0,0 +1,13 @@
+package com.lagradost.cloudstream3.utils
+
+/**
+ * Returns the current locale as an IETF BCP 47 language tag.
+ */
+expect fun getCurrentLocale(): String
+
+/**
+ * Returns the display name of [ietfTag] localized into [localizedTo].
+ * Returns null if the platform couldn't produce a meaningful name
+ * (i.e. it just echoed back the tag or contained a bare language code with parentheses).
+ */
+expect fun localizedLanguageName(ietfTag: String, localizedTo: String): String?

library/src/jsMain/kotlin/com/lagradost/cloudstream3/utils/SubtitleHelperPlatform.js.kt

@@ -0,0 +1,18 @@
+package com.lagradost.cloudstream3.utils
+
+actual fun getCurrentLocale(): String =
+    js("navigator.language") as? String ?: "en"
+
+actual fun localizedLanguageName(ietfTag: String, localizedTo: String): String? =
+    try {
+        val dn = IntlDisplayNames(arrayOf(localizedTo), js("({ type: 'language' })"))
+        val name = dn.of(ietfTag)
+        if (name.isNullOrBlank() || name.equals(ietfTag, ignoreCase = true)) null else name
+    } catch (e: Throwable) {
+        null
+    }
+
+@JsName("Intl.DisplayNames")
+external class IntlDisplayNames(locales: Array<String>, options: dynamic) {
+    fun of(code: String): String?
+}

library/src/jvmMain/kotlin/com/lagradost/cloudstream3/utils/SubtitleHelperPlatform.jvm.kt

@@ -0,0 +1,21 @@
+package com.lagradost.cloudstream3.utils
+
+import java.util.Locale
+
+actual fun getCurrentLocale(): String =
+    Locale.getDefault().toLanguageTag()
+
+actual fun localizedLanguageName(ietfTag: String, localizedTo: String): String? {
+    val localeOfLangCode = Locale.forLanguageTag(ietfTag)
+    val localeOfLocalizeTo = Locale.forLanguageTag(localizedTo)
+    val displayName = localeOfLangCode.getDisplayName(localeOfLocalizeTo)
+
+    // Locale.getDisplayName() falls back to the raw tag or "language (country)" form
+    // when it doesn't know how to render the name.
+    val langCodeWithCountry = "${localeOfLangCode.language} ("
+    val failed =
+        displayName.equals(ietfTag, ignoreCase = true) ||
+        displayName.contains(langCodeWithCountry, ignoreCase = true)
+
+    return if (failed) null else displayName
+}