Games: launch options for Steam games in the Edit screen, shared with Steam's Properties (#1888)

app/src/main/java/com/droiddeck/launcher/frontend/SteamLaunchOptions.kt

@@ -0,0 +1,162 @@
+package com.droiddeck.launcher.frontend
+
+import android.content.Context
+import android.util.Log
+import com.droiddeck.launcher.session.SessionPrefs
+import com.droiddeck.launcher.session.SessionService
+import com.droiddeck.launcher.session.SessionState
+import com.droiddeck.launcher.stores.SteamLiveShortcuts
+import java.io.File
+import java.nio.file.Files
+import java.nio.file.StandardCopyOption
+
+object SteamLaunchOptions {
+    private const val TAG = "SteamLaunchOptions"
+    private val STEAM = listOf("UserLocalConfigStore", "Software", "Valve", "Steam")
+
+    fun current(context: Context, appId: Int): String =
+        SteamLiveShortcuts.launchOptions(context, appId.toLong()) ?: steam(SessionPrefs.activeSteamRoot(context), appId).orEmpty()
+
+    enum class Saved { YES, NO, DESKTOP }
+
+    fun set(context: Context, appId: Int, options: String, shown: String): Saved {
+        val value = options.trim()
+        if (SessionState.running && SessionState.mode == SessionService.MODE_DESKTOP) return Saved.DESKTOP
+        if (SessionState.running && SessionState.mode == SessionService.MODE_STEAM) {
+            val live = SteamLiveShortcuts.launchOptions(context, appId.toLong()) ?: return Saved.NO
+            if (live.trim() != shown.trim()) return Saved.NO
+            return if (SteamLiveShortcuts.setLaunchOptions(context, appId.toLong(), value)) Saved.YES else Saved.NO
+        }
+        val home = SessionPrefs.activeSteamRoot(context)
+        if (steam(home, appId).orEmpty().trim() != shown.trim()) return Saved.NO
+        return if (write(home, appId, value)) Saved.YES else Saved.NO
+    }
+
+    internal fun steam(steamHome: File, appId: Int): String? {
+        val config = AddedGames.accountConfig(steamHome) ?: return null
+        val text = runCatching { File(config, "localconfig.vdf").readText() }.getOrNull() ?: return null
+        return launchOptions(text, appId)
+    }
+
+    internal fun write(steamHome: File, appId: Int, options: String): Boolean {
+        val config = AddedGames.accountConfig(steamHome)?.let { File(it, "localconfig.vdf") } ?: return false
+        val text = runCatching { config.readText() }.getOrNull() ?: return false
+        val updated = withLaunchOptions(text, appId, options) ?: return false
+        if (updated == text) return true
+        val staged = File(config.parentFile, config.name + ".staged")
+        return try {
+            staged.writeText(updated)
+            if (config.readText() != text) {
+                staged.delete()
+                return false
+            }
+            Files.move(staged.toPath(), config.toPath(), StandardCopyOption.REPLACE_EXISTING, StandardCopyOption.ATOMIC_MOVE)
+            true
+        } catch (e: Exception) {
+            staged.delete()
+            Log.w(TAG, "could not write launch options to ${config.path}", e)
+            false
+        }
+    }
+
+    internal fun launchOptions(text: String, appId: Int): String? {
+        val app = section(text, STEAM + "apps" + appId.toString()) ?: return null
+        return entries(text, app.valueStart, app.end).firstOrNull { !it.section && it.key.equals("LaunchOptions", true) }
+            ?.let { unescape(text.substring(it.valueStart + 1, it.end)) }
+    }
+
+    internal fun withLaunchOptions(text: String, appId: Int, options: String): String? {
+        val newline = if (text.contains("\r\n")) "\r\n" else "\n"
+        var updated = text
+        var path = STEAM
+        for (key in listOf("apps", appId.toString())) {
+            updated = withSection(updated, section(updated, path) ?: return null, key, newline) ?: return null
+            path = path + key
+        }
+        val app = section(updated, path) ?: return null
+        val value = "\"" + escape(options) + "\""
+        entries(updated, app.valueStart, app.end).firstOrNull { !it.section && it.key.equals("LaunchOptions", true) }?.let {
+            return updated.replaceRange(it.valueStart, it.end + 1, value)
+        }
+        val lineStart = closingLine(updated, app) ?: return null
+        val indent = updated.substring(lineStart, app.end) + "\t"
+        return updated.substring(0, lineStart) + indent + "\"LaunchOptions\"\t\t" + value + newline + updated.substring(lineStart)
+    }
+
+    private class Entry(val key: String, val valueStart: Int, val end: Int, val section: Boolean)
+
+    private fun section(text: String, path: List<String>): Entry? {
+        var found: Entry? = null
+        for (key in path) {
+            found = entries(text, found?.valueStart ?: -1, found?.end ?: text.length)
+                .firstOrNull { it.section && it.key.equals(key, true) } ?: return null
+        }
+        return found
+    }
+
+    private fun entries(text: String, open: Int, close: Int): List<Entry> {
+        val found = ArrayList<Entry>()
+        var key: String? = null
+        var i = open + 1
+        while (i < close) {
+            when {
+                text[i] == '"' -> {
+                    val end = stringEnd(text, i) ?: return found
+                    if (key == null) key = unescape(text.substring(i + 1, end)) else { found += Entry(key, i, end, false); key = null }
+                    i = end + 1
+                }
+                text[i] == '{' -> {
+                    val end = sectionEnd(text, i) ?: return found
+                    key?.let { found += Entry(it, i, end, true) }
+                    key = null
+                    i = end + 1
+                }
+                text.startsWith("//", i) -> i = text.indexOf('\n', i).let { if (it < 0) close else it }
+                else -> i++
+            }
+        }
+        return found
+    }
+
+    private fun stringEnd(text: String, open: Int): Int? {
+        var i = open + 1
+        while (i < text.length) {
+            when (text[i]) {
+                '\\' -> i += 2
+                '"' -> return i
+                else -> i++
+            }
+        }
+        return null
+    }
+
+    private fun sectionEnd(text: String, open: Int): Int? {
+        var depth = 0
+        var i = open
+        while (i < text.length) {
+            when (text[i]) {
+                '"' -> i = stringEnd(text, i) ?: return null
+                '{' -> depth++
+                '}' -> if (--depth == 0) return i
+            }
+            i++
+        }
+        return null
+    }
+
+    private fun withSection(text: String, parent: Entry, key: String, newline: String): String? {
+        if (entries(text, parent.valueStart, parent.end).any { it.section && it.key.equals(key, true) }) return text
+        val lineStart = closingLine(text, parent) ?: return null
+        val indent = text.substring(lineStart, parent.end) + "\t"
+        return text.substring(0, lineStart) + "$indent\"$key\"$newline$indent{$newline$indent}$newline" + text.substring(lineStart)
+    }
+
+    private fun closingLine(text: String, section: Entry): Int? {
+        val lineStart = text.lastIndexOf('\n', section.end - 1) + 1
+        return lineStart.takeIf { lineStart > section.valueStart && text.substring(lineStart, section.end).all { it == '\t' || it == ' ' } }
+    }
+
+    private fun escape(value: String) = value.replace("\\", "\\\\").replace("\"", "\\\"")
+
+    private fun unescape(value: String) = value.replace(Regex("\\\\(.)"), "$1")
+}

app/src/main/java/com/droiddeck/launcher/stores/SteamLiveShortcuts.kt

@@ -92,6 +92,28 @@ object SteamLiveShortcuts {
         if (evaluate(context, js) != null) Log.i(TAG, "live shortcuts: updated $id")
     }
 
+    fun launchOptions(context: Context, appId: Long): String? {
+        if (!clientRunning()) return null
+        val js = """
+            new Promise(done => {
+              let handle = null, answer;
+              const finish = d => { clearTimeout(timer); try { handle?.unregister(); } catch (e) {} done(d); };
+              const timer = setTimeout(() => finish(null), 4000);
+              handle = SteamClient.Apps.RegisterForAppDetails(${appId and 0xFFFFFFFFL}, d => { answer = d; if (handle) finish(d); });
+              if (answer !== undefined) finish(answer);
+            }).then(d => typeof d?.strLaunchOptions === 'string' ? d.strLaunchOptions : null)
+        """.trimIndent()
+        return evaluate(context, js)
+    }
+
+    fun setLaunchOptions(context: Context, appId: Long, options: String): Boolean {
+        if (!clientRunning()) return false
+        val id = appId and 0xFFFFFFFFL
+        val done = evaluate(context, "(async () => { SteamClient.Apps.SetAppLaunchOptions($id, ${JSONObject.quote(options)}); return 1; })()") != null
+        if (done) Log.i(TAG, "live: launch options for $id")
+        return done
+    }
+
     fun setArt(context: Context, appId: Long, assetType: Int?, file: java.io.File?, iconPath: String? = null) {
         if (!clientRunning()) return
         val id = appId and 0xFFFFFFFFL

app/src/main/java/com/droiddeck/launcher/ui/AddedGameEditor.kt

@@ -68,6 +68,7 @@ import com.droiddeck.launcher.frontend.AddedGames
 import com.droiddeck.launcher.frontend.LogoPosition
 import com.droiddeck.launcher.frontend.SteamGameArt
 import com.droiddeck.launcher.frontend.SteamGridDb
+import com.droiddeck.launcher.frontend.SteamLaunchOptions
 import com.droiddeck.launcher.session.SessionPrefs
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
@@ -191,7 +192,7 @@ internal fun SteamGameArtEditor(
     game: com.droiddeck.launcher.frontend.Library.SteamGame, onClose: () -> Unit, onChanged: () -> Unit,
 ) {
     val target = remember(game.appId) { ArtTarget.of(game) }
-    ArtOnlyEditor(game.name, target, game, { SteamGameArt.describe(it, game) }, onClose, onChanged)
+    ArtOnlyEditor(game.name, target, game, { SteamGameArt.describe(it, game) }, onClose, onChanged, launchAppId = game.appId)
 }
 
 @Composable
@@ -207,18 +208,25 @@ internal fun StoreGameArtEditor(folder: String, name: String, onClose: () -> Uni
 @Composable
 private fun ArtOnlyEditor(
     name: String, target: ArtTarget?, refresh: Any?, describe: (Context) -> List<AddedGameArt.SlotState>,
-    onClose: () -> Unit, onChanged: () -> Unit,
+    onClose: () -> Unit, onChanged: () -> Unit, launchAppId: Int? = null,
 ) {
     val app = LocalContext.current.applicationContext
     val colors = MaterialTheme.colorScheme
+    val scope = rememberCoroutineScope()
     val shown = rememberShown(onClose)
     val close = { shown.targetState = false }
     var version by remember { mutableIntStateOf(0) }
     var arts by remember { mutableStateOf<List<AddedGameArt.SlotState>>(emptyList()) }
     var artSlot by remember { mutableStateOf<AddedGameArt.Slot?>(null) }
     var logoOpen by remember { mutableStateOf(false) }
+    var launchOptions by remember { mutableStateOf<String?>(null) }
+    var launchVersion by remember { mutableIntStateOf(0) }
+    var editingLaunch by remember { mutableStateOf<String?>(null) }
+    var launchSaving by remember { mutableStateOf(false) }
+    var launchError by remember { mutableStateOf<Int?>(null) }
     val position = rememberLogoPosition(target, version)
     LaunchedEffect(version, refresh) { if (target != null) arts = withContext(Dispatchers.IO) { describe(app) } }
+    LaunchedEffect(launchAppId, launchVersion) { if (launchAppId != null) launchOptions = withContext(Dispatchers.IO) { SteamLaunchOptions.current(app, launchAppId) } }
     val first = remember { FocusRequester() }
     LaunchedEffect(Unit) { focusWithinFrames({ false }) { first } }
     AppDialog(shown, close, "artEditor", wide = false, maxWidth = 460.dp) {
@@ -228,10 +236,19 @@ private fun ArtOnlyEditor(
             verticalArrangement = Arrangement.spacedBy(6.dp),
             modifier = Modifier.fillMaxWidth().heightIn(max = maxHeight).verticalScroll(rememberScrollState()),
         ) {
-            Text(stringResource(R.string.edit_artwork), fontSize = 12.sp, color = colors.onSurfaceVariant, modifier = Modifier.padding(start = 4.dp, top = 2.dp))
+            if (launchAppId != null) {
+                FieldRow(stringResource(R.string.edit_launch_options), focus = first, onClick = { if (!launchSaving) launchOptions?.let { editingLaunch = it } }) {
+                    val options = launchOptions
+                    if (options == null || launchSaving) Loading() else ValueText(options.ifEmpty { "—" }, muted = options.isEmpty())
+                }
+                val error = launchError
+                if (error != null) Text(stringResource(error), fontSize = 12.sp, color = colors.error, modifier = Modifier.padding(start = 4.dp))
+                else Text(stringResource(R.string.edit_launch_options_steam_hint), fontSize = 12.sp, color = colors.onSurfaceVariant, modifier = Modifier.padding(start = 4.dp))
+            }
+            Text(stringResource(R.string.edit_artwork), fontSize = 12.sp, color = colors.onSurfaceVariant, modifier = Modifier.padding(start = 4.dp, top = if (launchAppId != null) 8.dp else 2.dp))
             for (slot in AddedGameArt.Slot.values()) key(slot) {
                 val state = arts.firstOrNull { it.slot == slot }
-                FieldRow(slot.label(), focus = if (slot == AddedGameArt.Slot.COVER) first else null, onClick = { if (target != null) artSlot = slot }) {
+                FieldRow(slot.label(), focus = if (slot == AddedGameArt.Slot.COVER && launchAppId == null) first else null, onClick = { if (target != null) artSlot = slot }) {
                     Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(10.dp)) {
                         SlotThumb(slot, state?.file)
                         if (state != null) ValueText(artSourceLabel(state.source), muted = true) else Loading()
@@ -241,6 +258,27 @@ private fun ArtOnlyEditor(
             PickerRow(Icons.Outlined.Tune, stringResource(R.string.art_adjust_logo), logoPositionSummary(position?.value), enabled = target != null && position != null) { logoOpen = true }
         }
     }
+    val before = editingLaunch
+    if (before != null && launchAppId != null) TextEntryDialog(stringResource(R.string.edit_launch_options), before, onDismiss = { editingLaunch = null }) { value ->
+        if (launchSaving || value == before.trim()) return@TextEntryDialog
+        launchSaving = true
+        scope.launch {
+            try {
+                val saved = withContext(Dispatchers.IO) { SteamLaunchOptions.set(app, launchAppId, value, before) }
+                launchError = when (saved) {
+                    SteamLaunchOptions.Saved.YES -> null
+                    SteamLaunchOptions.Saved.DESKTOP -> R.string.edit_launch_options_desktop
+                    SteamLaunchOptions.Saved.NO -> R.string.edit_launch_options_not_saved
+                }
+                if (saved == SteamLaunchOptions.Saved.YES) launchOptions = value else {
+                    launchOptions = null
+                    launchVersion++
+                }
+            } finally {
+                launchSaving = false
+            }
+        }
+    }
     val chosen = target ?: return
     artSlot?.let { slot ->
         ArtChooserDialog(chosen, slot, arts.firstOrNull { it.slot == slot }, onBack = { artSlot = null }, onCloseAll = { artSlot = null; close() }) { version++; onChanged() }

app/src/main/res/values-ar/strings.xml

@@ -2473,6 +2473,9 @@
     <string name="edit_target">الهدف</string>
     <string name="edit_start_in">بدء التشغيل في</string>
     <string name="edit_launch_options">خيارات التشغيل</string>
+    <string name="edit_launch_options_steam_hint">مشتركة مع خصائص Steam: أي تغيير في أحدهما يظهر في كليهما.</string>
+    <string name="edit_launch_options_not_saved">تعذّر حفظ خيارات التشغيل في Steam. حاول مرة أخرى.</string>
+    <string name="edit_launch_options_desktop">قد يكون Steam مفتوحًا في جلسة سطح المكتب. غيّر خيارات التشغيل من خصائصه، أو أغلق الجلسة أولًا.</string>
     <string name="edit_artwork">الصور الفنية</string>
     <string name="edit_other_exe">ملف exe آخر…</string>
     <string name="edit_remove">إزالة</string>

app/src/main/res/values-b+es+419/strings.xml

@@ -2422,6 +2422,9 @@
     <string name="edit_target">Destino</string>
     <string name="edit_start_in">Iniciar en</string>
     <string name="edit_launch_options">Opciones de lanzamiento</string>
+    <string name="edit_launch_options_steam_hint">Se comparten con las Propiedades de Steam: un cambio en cualquiera de los dos se ve en ambos.</string>
+    <string name="edit_launch_options_not_saved">No se pudieron guardar las opciones de lanzamiento en Steam. Inténtalo de nuevo.</string>
+    <string name="edit_launch_options_desktop">Es posible que Steam esté abierto en la sesión de escritorio. Cambia las opciones de lanzamiento en sus Propiedades o cierra primero la sesión.</string>
     <string name="edit_artwork">Ilustraciones</string>
     <string name="edit_other_exe">Otro exe…</string>
     <string name="edit_remove">Quitar</string>

app/src/main/res/values-bg/strings.xml

@@ -2381,6 +2381,9 @@
     <string name="edit_target">Цел</string>
     <string name="edit_start_in">Старт в</string>
     <string name="edit_launch_options">Настройки за стартиране</string>
+    <string name="edit_launch_options_steam_hint">Общи са със „Свойства“ в Steam: промяна на едното място се вижда и на двете.</string>
+    <string name="edit_launch_options_not_saved">Настройките за стартиране не можаха да бъдат запазени в Steam. Опитайте отново.</string>
+    <string name="edit_launch_options_desktop">Steam може да е отворен в сесията на работния плот. Променете настройките за стартиране в неговите „Свойства“ или първо затворете сесията.</string>
     <string name="edit_artwork">Визия</string>
     <string name="edit_other_exe">Друг exe…</string>
     <string name="edit_remove">Премахни</string>

app/src/main/res/values-cs/strings.xml

@@ -2427,6 +2427,9 @@
     <string name="edit_target">Cíl</string>
     <string name="edit_start_in">Spustit v</string>
     <string name="edit_launch_options">Možnosti spuštění</string>
+    <string name="edit_launch_options_steam_hint">Sdíleno s Vlastnostmi ve Steamu: změna na jednom místě se projeví na obou.</string>
+    <string name="edit_launch_options_not_saved">Možnosti spuštění se nepodařilo uložit do Steamu. Zkuste to znovu.</string>
+    <string name="edit_launch_options_desktop">Steam může být otevřený v relaci Plochy. Změňte možnosti spuštění v jeho Vlastnostech, nebo nejdřív relaci ukončete.</string>
     <string name="edit_artwork">Grafika</string>
     <string name="edit_other_exe">Jiný exe…</string>
     <string name="edit_remove">Odstranit</string>

app/src/main/res/values-da/strings.xml

@@ -2381,6 +2381,9 @@
     <string name="edit_target">Mål</string>
     <string name="edit_start_in">Start i</string>
     <string name="edit_launch_options">Startindstillinger</string>
+    <string name="edit_launch_options_steam_hint">Delt med Egenskaber i Steam: en ændring det ene sted vises begge steder.</string>
+    <string name="edit_launch_options_not_saved">Startindstillingerne kunne ikke gemmes i Steam. Prøv igen.</string>
+    <string name="edit_launch_options_desktop">Steam kan være åben i skrivebordssessionen. Skift startindstillingerne under dens Egenskaber, eller luk sessionen først.</string>
     <string name="edit_artwork">Grafik</string>
     <string name="edit_other_exe">Anden exe…</string>
     <string name="edit_remove">Fjern</string>

app/src/main/res/values-de/strings.xml

@@ -2370,6 +2370,9 @@
     <string name="edit_target">Ziel</string>
     <string name="edit_start_in">Ausführen in</string>
     <string name="edit_launch_options">Startoptionen</string>
+    <string name="edit_launch_options_steam_hint">Gemeinsam mit den Eigenschaften in Steam: Eine Änderung an einer Stelle gilt für beide.</string>
+    <string name="edit_launch_options_not_saved">Die Startoptionen konnten nicht in Steam gespeichert werden. Versuche es erneut.</string>
+    <string name="edit_launch_options_desktop">Steam ist eventuell in der Desktop-Sitzung geöffnet. Ändere die Startoptionen dort in den Eigenschaften oder beende zuerst die Sitzung.</string>
     <string name="edit_artwork">Grafiken</string>
     <string name="edit_other_exe">Andere EXE…</string>
     <string name="edit_remove">Entfernen</string>

app/src/main/res/values-el/strings.xml

@@ -2381,6 +2381,9 @@
     <string name="edit_target">Προορισμός</string>
     <string name="edit_start_in">Εκκίνηση σε</string>
     <string name="edit_launch_options">Επιλογές εκκίνησης</string>
+    <string name="edit_launch_options_steam_hint">Κοινές με τις Ιδιότητες του Steam: μια αλλαγή στο ένα σημείο εμφανίζεται και στα δύο.</string>
+    <string name="edit_launch_options_not_saved">Δεν ήταν δυνατή η αποθήκευση των επιλογών εκκίνησης στο Steam. Δοκιμάστε ξανά.</string>
+    <string name="edit_launch_options_desktop">Το Steam μπορεί να είναι ανοιχτό στη συνεδρία επιφάνειας εργασίας. Αλλάξτε τις επιλογές εκκίνησης από τις Ιδιότητές του ή κλείστε πρώτα τη συνεδρία.</string>
     <string name="edit_artwork">Γραφικά</string>
     <string name="edit_other_exe">Άλλο exe…</string>
     <string name="edit_remove">Κατάργηση</string>

app/src/main/res/values-es/strings.xml

@@ -2401,6 +2401,9 @@
     <string name="edit_target">Destino</string>
     <string name="edit_start_in">Iniciar en</string>
     <string name="edit_launch_options">Opciones de lanzamiento</string>
+    <string name="edit_launch_options_steam_hint">Se comparten con las Propiedades de Steam: un cambio en cualquiera de los dos se ve en ambos.</string>
+    <string name="edit_launch_options_not_saved">No se pudieron guardar las opciones de lanzamiento en Steam. Inténtalo de nuevo.</string>
+    <string name="edit_launch_options_desktop">Puede que Steam esté abierto en la sesión de escritorio. Cambia las opciones de lanzamiento en sus Propiedades o cierra antes la sesión.</string>
     <string name="edit_artwork">Ilustraciones</string>
     <string name="edit_other_exe">Otro exe…</string>
     <string name="edit_remove">Quitar</string>

app/src/main/res/values-fi/strings.xml

@@ -2381,6 +2381,9 @@
     <string name="edit_target">Kohde</string>
     <string name="edit_start_in">Käynnistyskansio</string>
     <string name="edit_launch_options">Käynnistysasetukset</string>
+    <string name="edit_launch_options_steam_hint">Jaettu Steamin Ominaisuuksien kanssa: muutos jommassakummassa näkyy molemmissa.</string>
+    <string name="edit_launch_options_not_saved">Käynnistysasetuksia ei voitu tallentaa Steamiin. Yritä uudelleen.</string>
+    <string name="edit_launch_options_desktop">Steam voi olla auki työpöytäistunnossa. Muuta käynnistysasetuksia sen Ominaisuuksista tai sulje istunto ensin.</string>
     <string name="edit_artwork">Kuvitus</string>
     <string name="edit_other_exe">Toinen exe…</string>
     <string name="edit_remove">Poista</string>

app/src/main/res/values-fr/strings.xml

@@ -2401,6 +2401,9 @@
     <string name="edit_target">Cible</string>
     <string name="edit_start_in">Démarrer dans</string>
     <string name="edit_launch_options">Options de lancement</string>
+    <string name="edit_launch_options_steam_hint">Partagées avec les Propriétés de Steam : une modification d’un côté apparaît des deux.</string>
+    <string name="edit_launch_options_not_saved">Impossible d’enregistrer les options de lancement dans Steam. Réessayez.</string>
+    <string name="edit_launch_options_desktop">Steam est peut-être ouvert dans la session Bureau. Modifiez les options de lancement dans ses Propriétés, ou fermez d’abord la session.</string>
     <string name="edit_artwork">Illustrations</string>
     <string name="edit_other_exe">Autre exe…</string>
     <string name="edit_remove">Retirer</string>

app/src/main/res/values-hi/strings.xml

@@ -2381,6 +2381,9 @@
     <string name="edit_target">टार्गेट</string>
     <string name="edit_start_in">यहां शुरू करें</string>
     <string name="edit_launch_options">लॉन्च विकल्प</string>
+    <string name="edit_launch_options_steam_hint">Steam की Properties के साथ साझा: किसी एक जगह किया गया बदलाव दोनों में दिखता है।</string>
+    <string name="edit_launch_options_not_saved">लॉन्च विकल्प Steam में सहेजे नहीं जा सके। फिर से कोशिश करें।</string>
+    <string name="edit_launch_options_desktop">Steam डेस्कटॉप सेशन में खुला हो सकता है। लॉन्च विकल्प उसकी Properties में बदलें, या पहले सेशन बंद करें।</string>
     <string name="edit_artwork">आर्टवर्क</string>
     <string name="edit_other_exe">दूसरा exe…</string>
     <string name="edit_remove">हटाएं</string>

app/src/main/res/values-hu/strings.xml

@@ -2381,6 +2381,9 @@
     <string name="edit_target">Cél</string>
     <string name="edit_start_in">Indítás innen</string>
     <string name="edit_launch_options">Indítási beállítások</string>
+    <string name="edit_launch_options_steam_hint">Közös a Steam Tulajdonságaival: az egyik helyen végzett módosítás mindkettőben megjelenik.</string>
+    <string name="edit_launch_options_not_saved">Az indítási beállításokat nem sikerült menteni a Steambe. Próbáld újra.</string>
+    <string name="edit_launch_options_desktop">Lehet, hogy a Steam nyitva van az asztali munkamenetben. Módosítsd az indítási beállításokat a Tulajdonságaiban, vagy előbb zárd be a munkamenetet.</string>
     <string name="edit_artwork">Illusztráció</string>
     <string name="edit_other_exe">Másik exe…</string>
     <string name="edit_remove">Eltávolítás</string>

app/src/main/res/values-in/strings.xml

@@ -2358,6 +2358,9 @@
     <string name="edit_target">Target</string>
     <string name="edit_start_in">Mulai di</string>
     <string name="edit_launch_options">Opsi peluncuran</string>
+    <string name="edit_launch_options_steam_hint">Dibagikan dengan Properti Steam: perubahan di salah satunya muncul di keduanya.</string>
+    <string name="edit_launch_options_not_saved">Tidak dapat menyimpan opsi peluncuran ke Steam. Coba lagi.</string>
+    <string name="edit_launch_options_desktop">Steam mungkin terbuka di sesi desktop. Ubah opsi peluncuran di Properti Steam, atau tutup sesinya terlebih dahulu.</string>
     <string name="edit_artwork">Artwork</string>
     <string name="edit_other_exe">Exe lain…</string>
     <string name="edit_remove">Hapus</string>

app/src/main/res/values-it/strings.xml

@@ -2393,6 +2393,9 @@
     <string name="edit_target">Destinazione</string>
     <string name="edit_start_in">Avvia in</string>
     <string name="edit_launch_options">Opzioni di avvio</string>
+    <string name="edit_launch_options_steam_hint">Condivise con le Proprietà di Steam: una modifica in uno dei due punti compare in entrambi.</string>
+    <string name="edit_launch_options_not_saved">Impossibile salvare le opzioni di avvio in Steam. Riprova.</string>
+    <string name="edit_launch_options_desktop">Steam potrebbe essere aperto nella sessione desktop. Cambia le opzioni di avvio nelle sue Proprietà o chiudi prima la sessione.</string>
     <string name="edit_artwork">Illustrazioni</string>
     <string name="edit_other_exe">Altro exe…</string>
     <string name="edit_remove">Rimuovi</string>

app/src/main/res/values-ja/strings.xml

@@ -2325,6 +2325,9 @@
     <string name="edit_target">ターゲット</string>
     <string name="edit_start_in">開始フォルダ</string>
     <string name="edit_launch_options">起動オプション</string>
+    <string name="edit_launch_options_steam_hint">Steam のプロパティと共通です。どちらかで変更すると両方に反映されます。</string>
+    <string name="edit_launch_options_not_saved">起動オプションを Steam に保存できませんでした。もう一度お試しください。</string>
+    <string name="edit_launch_options_desktop">デスクトップのセッションで Steam が開いている可能性があります。Steam のプロパティで起動オプションを変更するか、先にセッションを終了してください。</string>
     <string name="edit_artwork">アートワーク</string>
     <string name="edit_other_exe">別の exe…</string>
     <string name="edit_remove">削除</string>

app/src/main/res/values-ko/strings.xml

@@ -2358,6 +2358,9 @@
     <string name="edit_target">대상</string>
     <string name="edit_start_in">시작 위치</string>
     <string name="edit_launch_options">실행 옵션</string>
+    <string name="edit_launch_options_steam_hint">Steam 속성과 공유됩니다. 어느 한쪽에서 바꾸면 양쪽에 모두 반영됩니다.</string>
+    <string name="edit_launch_options_not_saved">실행 옵션을 Steam에 저장하지 못했습니다. 다시 시도하세요.</string>
+    <string name="edit_launch_options_desktop">데스크톱 세션에서 Steam이 열려 있을 수 있습니다. Steam 속성에서 실행 옵션을 바꾸거나 먼저 세션을 닫으세요.</string>
     <string name="edit_artwork">아트워크</string>
     <string name="edit_other_exe">다른 exe…</string>
     <string name="edit_remove">제거</string>

app/src/main/res/values-ms/strings.xml

@@ -2358,6 +2358,9 @@
     <string name="edit_target">Sasaran</string>
     <string name="edit_start_in">Mula dalam</string>
     <string name="edit_launch_options">Pilihan pelancaran</string>
+    <string name="edit_launch_options_steam_hint">Dikongsi dengan Properties dalam Steam: perubahan di salah satu tempat dipaparkan di kedua-duanya.</string>
+    <string name="edit_launch_options_not_saved">Tidak dapat menyimpan pilihan pelancaran ke Steam. Cuba lagi.</string>
+    <string name="edit_launch_options_desktop">Steam mungkin terbuka dalam sesi desktop. Tukar pilihan pelancaran dalam Properties Steam, atau tutup sesi itu dahulu.</string>
     <string name="edit_artwork">Seni</string>
     <string name="edit_other_exe">Exe lain…</string>
     <string name="edit_remove">Alih keluar</string>

app/src/main/res/values-nb/strings.xml

@@ -2381,6 +2381,9 @@
     <string name="edit_target">Mål</string>
     <string name="edit_start_in">Start i</string>
     <string name="edit_launch_options">Startalternativer</string>
+    <string name="edit_launch_options_steam_hint">Delt med Egenskaper i Steam: en endring det ene stedet vises begge steder.</string>
+    <string name="edit_launch_options_not_saved">Kunne ikke lagre startalternativene i Steam. Prøv igjen.</string>
+    <string name="edit_launch_options_desktop">Steam kan være åpent i skrivebordssesjonen. Endre startalternativene under Egenskaper der, eller lukk sesjonen først.</string>
     <string name="edit_artwork">Grafikk</string>
     <string name="edit_other_exe">Annen exe…</string>
     <string name="edit_remove">Fjern</string>

app/src/main/res/values-nl/strings.xml

@@ -2381,6 +2381,9 @@
     <string name="edit_target">Doel</string>
     <string name="edit_start_in">Beginnen in</string>
     <string name="edit_launch_options">Opstartopties</string>
+    <string name="edit_launch_options_steam_hint">Gedeeld met de Eigenschappen in Steam: een wijziging op de ene plek is op beide te zien.</string>
+    <string name="edit_launch_options_not_saved">De opstartopties konden niet in Steam worden opgeslagen. Probeer het opnieuw.</string>
+    <string name="edit_launch_options_desktop">Steam is misschien geopend in de desktopsessie. Wijzig de opstartopties daar in de Eigenschappen, of sluit eerst de sessie.</string>
     <string name="edit_artwork">Artwork</string>
     <string name="edit_other_exe">Andere exe…</string>
     <string name="edit_remove">Verwijderen</string>

app/src/main/res/values-pl/strings.xml

@@ -2427,6 +2427,9 @@
     <string name="edit_target">Element docelowy</string>
     <string name="edit_start_in">Uruchom w</string>
     <string name="edit_launch_options">Opcje uruchamiania</string>
+    <string name="edit_launch_options_steam_hint">Wspólne z Właściwościami w Steam: zmiana w jednym miejscu jest widoczna w obu.</string>
+    <string name="edit_launch_options_not_saved">Nie udało się zapisać opcji uruchamiania w Steam. Spróbuj ponownie.</string>
+    <string name="edit_launch_options_desktop">Steam może być otwarty w sesji pulpitu. Zmień opcje uruchamiania w jego Właściwościach albo najpierw zamknij sesję.</string>
     <string name="edit_artwork">Grafika</string>
     <string name="edit_other_exe">Inny plik exe…</string>
     <string name="edit_remove">Usuń</string>

app/src/main/res/values-pt-rPT/strings.xml

@@ -2393,6 +2393,9 @@
     <string name="edit_target">Destino</string>
     <string name="edit_start_in">Iniciar em</string>
     <string name="edit_launch_options">Opções de arranque</string>
+    <string name="edit_launch_options_steam_hint">Partilhadas com as Propriedades do Steam: uma alteração num dos locais aparece em ambos.</string>
+    <string name="edit_launch_options_not_saved">Não foi possível guardar as opções de arranque no Steam. Tenta novamente.</string>
+    <string name="edit_launch_options_desktop">O Steam pode estar aberto na sessão do ambiente de trabalho. Altera as opções de arranque nas Propriedades dele, ou fecha primeiro a sessão.</string>
     <string name="edit_artwork">Imagens</string>
     <string name="edit_other_exe">Outro exe…</string>
     <string name="edit_remove">Remover</string>

app/src/main/res/values-pt/strings.xml

@@ -2393,6 +2393,9 @@
     <string name="edit_target">Destino</string>
     <string name="edit_start_in">Iniciar em</string>
     <string name="edit_launch_options">Opções de inicialização</string>
+    <string name="edit_launch_options_steam_hint">Compartilhadas com as Propriedades da Steam: uma alteração em um dos lugares aparece nos dois.</string>
+    <string name="edit_launch_options_not_saved">Não foi possível salvar as opções de inicialização na Steam. Tente novamente.</string>
+    <string name="edit_launch_options_desktop">A Steam pode estar aberta na sessão da área de trabalho. Altere as opções de inicialização nas Propriedades dela ou feche a sessão primeiro.</string>
     <string name="edit_artwork">Artes</string>
     <string name="edit_other_exe">Outro exe…</string>
     <string name="edit_remove">Remover</string>

app/src/main/res/values-ro/strings.xml

@@ -2404,6 +2404,9 @@
     <string name="edit_target">Țintă</string>
     <string name="edit_start_in">Pornește în</string>
     <string name="edit_launch_options">Opțiuni de lansare</string>
+    <string name="edit_launch_options_steam_hint">Comune cu Proprietățile din Steam: o modificare într-unul dintre locuri apare în ambele.</string>
+    <string name="edit_launch_options_not_saved">Opțiunile de lansare nu au putut fi salvate în Steam. Încearcă din nou.</string>
+    <string name="edit_launch_options_desktop">Steam poate fi deschis în sesiunea desktop. Schimbă opțiunile de lansare din Proprietățile lui sau închide mai întâi sesiunea.</string>
     <string name="edit_artwork">Grafică</string>
     <string name="edit_other_exe">Alt exe…</string>
     <string name="edit_remove">Elimină</string>

app/src/main/res/values-ru/strings.xml

@@ -2424,6 +2424,9 @@
     <string name="edit_target">Объект</string>
     <string name="edit_start_in">Рабочая папка</string>
     <string name="edit_launch_options">Параметры запуска</string>
+    <string name="edit_launch_options_steam_hint">Общие со «Свойствами» Steam: изменение в одном месте видно в обоих.</string>
+    <string name="edit_launch_options_not_saved">Не удалось сохранить параметры запуска в Steam. Попробуйте ещё раз.</string>
+    <string name="edit_launch_options_desktop">Steam может быть открыт в сессии рабочего стола. Измените параметры запуска в его «Свойствах» или сначала закройте сессию.</string>
     <string name="edit_artwork">Обложки</string>
     <string name="edit_other_exe">Другой exe…</string>
     <string name="edit_remove">Убрать</string>

app/src/main/res/values-sv/strings.xml

@@ -2381,6 +2381,9 @@
     <string name="edit_target">Mål</string>
     <string name="edit_start_in">Starta i</string>
     <string name="edit_launch_options">Startalternativ</string>
+    <string name="edit_launch_options_steam_hint">Delas med Egenskaper i Steam: en ändring på det ena stället syns på båda.</string>
+    <string name="edit_launch_options_not_saved">Det gick inte att spara startalternativen i Steam. Försök igen.</string>
+    <string name="edit_launch_options_desktop">Steam kan vara öppet i skrivbordssessionen. Ändra startalternativen under Egenskaper där, eller stäng sessionen först.</string>
     <string name="edit_artwork">Bildmaterial</string>
     <string name="edit_other_exe">Annan exe…</string>
     <string name="edit_remove">Ta bort</string>

app/src/main/res/values-th/strings.xml

@@ -2358,6 +2358,9 @@
     <string name="edit_target">เป้าหมาย</string>
     <string name="edit_start_in">เริ่มที่</string>
     <string name="edit_launch_options">ตัวเลือกการเปิด</string>
+    <string name="edit_launch_options_steam_hint">ใช้ร่วมกับคุณสมบัติใน Steam: เปลี่ยนที่ใดที่หนึ่งก็จะแสดงในทั้งสองที่</string>
+    <string name="edit_launch_options_not_saved">บันทึกตัวเลือกการเปิดลงใน Steam ไม่ได้ ลองอีกครั้ง</string>
+    <string name="edit_launch_options_desktop">Steam อาจเปิดอยู่ในเซสชันเดสก์ท็อป เปลี่ยนตัวเลือกการเปิดในคุณสมบัติของ Steam หรือปิดเซสชันก่อน</string>
     <string name="edit_artwork">ภาพปก</string>
     <string name="edit_other_exe">exe อื่น…</string>
     <string name="edit_remove">ลบ</string>

app/src/main/res/values-tr/strings.xml

@@ -2370,6 +2370,9 @@
     <string name="edit_target">Hedef</string>
     <string name="edit_start_in">Başlangıç yeri</string>
     <string name="edit_launch_options">Başlatma seçenekleri</string>
+    <string name="edit_launch_options_steam_hint">Steam Özellikleri ile ortaktır: birinde yapılan değişiklik ikisinde de görünür.</string>
+    <string name="edit_launch_options_not_saved">Başlatma seçenekleri Steam\'e kaydedilemedi. Tekrar deneyin.</string>
+    <string name="edit_launch_options_desktop">Steam masaüstü oturumunda açık olabilir. Başlatma seçeneklerini Steam Özellikleri\'nden değiştirin veya önce oturumu kapatın.</string>
     <string name="edit_artwork">Görsel</string>
     <string name="edit_other_exe">Diğer exe…</string>
     <string name="edit_remove">Kaldır</string>

app/src/main/res/values-uk/strings.xml

@@ -2427,6 +2427,9 @@
     <string name="edit_target">Ціль</string>
     <string name="edit_start_in">Робоча папка</string>
     <string name="edit_launch_options">Параметри запуску</string>
+    <string name="edit_launch_options_steam_hint">Спільні з «Властивостями» Steam: зміна в одному місці видна в обох.</string>
+    <string name="edit_launch_options_not_saved">Не вдалося зберегти параметри запуску в Steam. Спробуйте ще раз.</string>
+    <string name="edit_launch_options_desktop">Steam може бути відкритий у сеансі робочого столу. Змініть параметри запуску в його «Властивостях» або спершу закрийте сеанс.</string>
     <string name="edit_artwork">Графіка</string>
     <string name="edit_other_exe">Інший exe…</string>
     <string name="edit_remove">Вилучити</string>

app/src/main/res/values-vi/strings.xml

@@ -2358,6 +2358,9 @@
     <string name="edit_target">Đích</string>
     <string name="edit_start_in">Khởi chạy trong</string>
     <string name="edit_launch_options">Tùy chọn khởi chạy</string>
+    <string name="edit_launch_options_steam_hint">Dùng chung với Thuộc tính của Steam: thay đổi ở một nơi sẽ hiện ở cả hai.</string>
+    <string name="edit_launch_options_not_saved">Không thể lưu tùy chọn khởi chạy vào Steam. Hãy thử lại.</string>
+    <string name="edit_launch_options_desktop">Steam có thể đang mở trong phiên desktop. Hãy đổi tùy chọn khởi chạy trong Thuộc tính của Steam, hoặc đóng phiên trước.</string>
     <string name="edit_artwork">Hình ảnh</string>
     <string name="edit_other_exe">Exe khác…</string>
     <string name="edit_remove">Xóa</string>

app/src/main/res/values-zh-rCN/strings.xml

@@ -2400,6 +2400,9 @@
     <string name="edit_target">目标</string>
     <string name="edit_start_in">起始位置</string>
     <string name="edit_launch_options">启动选项</string>
+    <string name="edit_launch_options_steam_hint">与 Steam 的“属性”共用：在任一处更改，两处都会更新。</string>
+    <string name="edit_launch_options_not_saved">无法将启动选项保存到 Steam。请重试。</string>
+    <string name="edit_launch_options_desktop">Steam 可能正在桌面会话中运行。请在 Steam 的“属性”中更改启动选项，或先关闭该会话。</string>
     <string name="edit_artwork">美术图</string>
     <string name="edit_other_exe">其他 exe…</string>
     <string name="edit_remove">移除</string>

app/src/main/res/values-zh-rHK/strings.xml

@@ -2326,6 +2326,9 @@
     <string name="edit_target">目標</string>
     <string name="edit_start_in">開始位置</string>
     <string name="edit_launch_options">啟動選項</string>
+    <string name="edit_launch_options_steam_hint">與 Steam 的「內容」共用：在任一處更改，兩處都會更新。</string>
+    <string name="edit_launch_options_not_saved">無法將啟動選項儲存到 Steam。請再試一次。</string>
+    <string name="edit_launch_options_desktop">Steam 可能正在桌面會話中執行。請在 Steam 的「內容」中更改啟動選項，或先關閉該會話。</string>
     <string name="edit_artwork">圖片</string>
     <string name="edit_other_exe">其他 exe…</string>
     <string name="edit_remove">移除</string>

app/src/main/res/values-zh-rTW/strings.xml

@@ -2326,6 +2326,9 @@
     <string name="edit_target">目標</string>
     <string name="edit_start_in">開始位置</string>
     <string name="edit_launch_options">啟動選項</string>
+    <string name="edit_launch_options_steam_hint">與 Steam 的「內容」共用：在任一處變更，兩處都會更新。</string>
+    <string name="edit_launch_options_not_saved">無法將啟動選項儲存至 Steam。請再試一次。</string>
+    <string name="edit_launch_options_desktop">Steam 可能正在桌面工作階段中執行。請在 Steam 的「內容」中變更啟動選項，或先關閉該工作階段。</string>
     <string name="edit_artwork">圖片</string>
     <string name="edit_other_exe">其他 exe…</string>
     <string name="edit_remove">移除</string>

app/src/main/res/values/strings.xml

@@ -2508,6 +2508,9 @@
     <string name="edit_target">Target</string>
     <string name="edit_start_in">Start in</string>
     <string name="edit_launch_options">Launch options</string>
+    <string name="edit_launch_options_steam_hint">Shared with Steam\'s Properties: a change in either one shows in both.</string>
+    <string name="edit_launch_options_not_saved">Could not save the launch options to Steam. Try again.</string>
+    <string name="edit_launch_options_desktop">Steam may be open in the desktop session. Change the launch options in its Properties, or close the session first.</string>
     <string name="edit_artwork">Artwork</string>
     <string name="edit_other_exe">Other exe…</string>
     <string name="edit_remove">Remove</string>

app/src/test/java/com/droiddeck/launcher/frontend/SteamLaunchOptionsTest.kt

@@ -0,0 +1,163 @@
+package com.droiddeck.launcher.frontend
+
+import com.droiddeck.launcher.session.SessionPrefs
+import com.droiddeck.launcher.session.SessionService
+import com.droiddeck.launcher.session.SessionState
+import java.io.File
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.TemporaryFolder
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.RuntimeEnvironment
+import org.robolectric.annotation.Config
+
+@RunWith(RobolectricTestRunner::class)
+@Config(sdk = [33])
+class SteamLaunchOptionsTest {
+    @get:Rule val tmp = TemporaryFolder()
+
+    private fun config(apps: String) = listOf(
+        "\"UserLocalConfigStore\"", "{", "\t\"Software\"", "\t{", "\t\t\"Valve\"", "\t\t{", "\t\t\t\"Steam\"", "\t\t\t{",
+        apps, "\t\t\t}", "\t\t}", "\t}", "\t\"WebStorage\"", "\t{", "\t\t\"x\"\t\t\"1\"", "\t}", "}", "",
+    ).joinToString("\n")
+
+    private fun apps(vararg lines: String) = (listOf("\t\t\t\t\"apps\"", "\t\t\t\t{") + lines + "\t\t\t\t}").joinToString("\n")
+
+    private val sparking = arrayOf(
+        "\t\t\t\t\t\"1790600\"", "\t\t\t\t\t{", "\t\t\t\t\t\t\"LastPlayed\"\t\t\"1761897600\"", "\t\t\t\t\t\t\"LaunchOptions\"\t\t\"-dx11\"", "\t\t\t\t\t}",
+    )
+
+    @Test fun replacesTheOptionsSteamHas() {
+        val text = config(apps(*sparking))
+        val updated = SteamLaunchOptions.withLaunchOptions(text, 1790600, "-dx12")!!
+        assertEquals(text.replace("\"-dx11\"", "\"-dx12\""), updated)
+        assertEquals("-dx12", SteamLaunchOptions.launchOptions(updated, 1790600))
+    }
+
+    @Test fun addsOptionsToAGameThatHasNone() {
+        val text = config(apps("\t\t\t\t\t\"1790600\"", "\t\t\t\t\t{", "\t\t\t\t\t\t\"LastPlayed\"\t\t\"1761897600\"", "\t\t\t\t\t}"))
+        assertEquals(config(apps(*sparking)).replace("-dx11", "-vulkan"), SteamLaunchOptions.withLaunchOptions(text, 1790600, "-vulkan"))
+    }
+
+    @Test fun addsTheGameAndTheAppsSectionWhenSteamHasNeither() {
+        val updated = SteamLaunchOptions.withLaunchOptions(config("\t\t\t\t\"language\"\t\t\"english\""), 1790600, "-dx11")!!
+        assertEquals(
+            config(
+                "\t\t\t\t\"language\"\t\t\"english\"\n" +
+                    apps("\t\t\t\t\t\"1790600\"", "\t\t\t\t\t{", "\t\t\t\t\t\t\"LaunchOptions\"\t\t\"-dx11\"", "\t\t\t\t\t}"),
+            ),
+            updated,
+        )
+        assertEquals("-dx11", SteamLaunchOptions.launchOptions(updated, 1790600))
+    }
+
+    @Test fun quotesAndBackslashesAreEscapedAndReadBack() {
+        val options = "PROTON_LOG=1 %command% -path \"C:\\Games\\DB\""
+        val updated = SteamLaunchOptions.withLaunchOptions(config(apps(*sparking)), 1790600, options)!!
+        assertEquals(true, updated.contains("\"PROTON_LOG=1 %command% -path \\\"C:\\\\Games\\\\DB\\\"\""))
+        assertEquals(options, SteamLaunchOptions.launchOptions(updated, 1790600))
+    }
+
+    @Test fun emptyOptionsClearSteams() {
+        val updated = SteamLaunchOptions.withLaunchOptions(config(apps(*sparking)), 1790600, "")!!
+        assertEquals("", SteamLaunchOptions.launchOptions(updated, 1790600))
+    }
+
+    @Test fun windowsLineEndsAreKept() {
+        val text = config("\t\t\t\t\"language\"\t\t\"english\"").replace("\n", "\r\n")
+        val updated = SteamLaunchOptions.withLaunchOptions(text, 1790600, "-dx11")!!
+        assertEquals(false, updated.replace("\r\n", "").contains('\n'))
+        assertEquals("-dx11", SteamLaunchOptions.launchOptions(updated, 1790600))
+    }
+
+    @Test fun onlyTheGamesOwnSectionChanges() {
+        val other = arrayOf(
+            "\t\t\t\t\t\"7\"", "\t\t\t\t\t{", "\t\t\t\t\t\t\"1790600\"", "\t\t\t\t\t\t{", "\t\t\t\t\t\t\t\"LaunchOptions\"\t\t\"keep\"", "\t\t\t\t\t\t}", "\t\t\t\t\t}",
+        )
+        val updated = SteamLaunchOptions.withLaunchOptions(config(apps(*other, *sparking)), 1790600, "-dx12")!!
+        assertEquals(true, updated.contains("\"keep\""))
+        assertEquals("-dx12", SteamLaunchOptions.launchOptions(updated, 1790600))
+        assertNull(SteamLaunchOptions.launchOptions(config(apps(*other)), 1790600))
+    }
+
+    @Test fun otherFilesAreLeftAlone() {
+        assertNull(SteamLaunchOptions.withLaunchOptions("\"InstallConfigStore\"\n{\n}\n", 1790600, "-dx11"))
+        assertNull(SteamLaunchOptions.withLaunchOptions("", 1790600, "-dx11"))
+        assertNull(SteamLaunchOptions.launchOptions("", 1790600))
+    }
+
+    private fun steamHome(home: File = tmp.newFolder("Steam")): File = home.also {
+        File(home, "config").mkdirs()
+        File(home, "config/loginusers.vdf").writeText(
+            "\"users\"\n{\n\t\"76561198021239924\"\n\t{\n\t\t\"AccountName\"\t\t\"a\"\n\t\t\"MostRecent\"\t\t\"1\"\n\t}\n}\n")
+    }
+
+    private fun localConfig(home: File, account: String) = File(home, "userdata/$account/config/localconfig.vdf").apply { parentFile!!.mkdirs() }
+
+    @Test fun aChangeGoesToTheSignedInAccountOnly() {
+        val home = steamHome()
+        val signedIn = localConfig(home, "60974196").apply { writeText(config(apps(*sparking))) }
+        val other = localConfig(home, "123").apply { writeText(config("\t\t\t\t\"language\"\t\t\"english\"")) }
+        val untouched = other.readText()
+        assertTrue(SteamLaunchOptions.write(home, 1790600, "-dx12"))
+        assertEquals("-dx12", SteamLaunchOptions.launchOptions(signedIn.readText(), 1790600))
+        assertEquals(untouched, other.readText())
+        assertFalse(File(signedIn.parentFile, "localconfig.vdf.staged").exists())
+    }
+
+    @Test fun whatSteamWroteLastIsWhatTheGameHas() {
+        val home = steamHome()
+        val config = localConfig(home, "60974196").apply { writeText(config(apps(*sparking))) }
+        assertTrue(SteamLaunchOptions.write(home, 1790600, "-dx12"))
+        config.writeText(SteamLaunchOptions.withLaunchOptions(config.readText(), 1790600, "-vulkan")!!)
+        assertEquals("-vulkan", SteamLaunchOptions.steam(home, 1790600))
+        assertNull(SteamLaunchOptions.steam(home, 400))
+    }
+
+    private val app get() = RuntimeEnvironment.getApplication()
+
+    private val written = ArrayList<File>()
+
+    private fun sessionConfig(): File {
+        val home = steamHome(SessionPrefs.activeSteamRoot(app))
+        return localConfig(home, "60974196").apply { writeText(config(apps(*sparking))) }
+            .also { written += it; written += File(home, "config/loginusers.vdf") }
+    }
+
+    @After fun noSession() {
+        SessionState.running = false
+        SessionState.mode = SessionService.MODE_STEAM
+        written.forEach { it.delete() }
+    }
+
+    @Test fun aValueChangedInSteamSinceItWasShownIsNotOverwritten() {
+        val config = sessionConfig()
+        assertEquals(SteamLaunchOptions.Saved.NO, SteamLaunchOptions.set(app, 1790600, "-dx12", shown = "-vulkan"))
+        assertEquals("-dx11", SteamLaunchOptions.launchOptions(config.readText(), 1790600))
+        assertEquals(SteamLaunchOptions.Saved.YES, SteamLaunchOptions.set(app, 1790600, "-dx12", shown = "-dx11"))
+        assertEquals("-dx12", SteamLaunchOptions.launchOptions(config.readText(), 1790600))
+    }
+
+    @Test fun aDesktopSessionLeavesTheFileToItsClient() {
+        val config = sessionConfig()
+        val before = config.readText()
+        SessionState.running = true
+        SessionState.mode = SessionService.MODE_DESKTOP
+        assertEquals(SteamLaunchOptions.Saved.DESKTOP, SteamLaunchOptions.set(app, 1790600, "-dx12", shown = "-dx11"))
+        assertEquals(before, config.readText())
+    }
+
+    @Test fun nothingIsWrittenWithoutASignedInAccountsConfig() {
+        assertFalse(SteamLaunchOptions.write(tmp.newFolder("NoSteam"), 1790600, "-dx11"))
+        val home = steamHome()
+        assertFalse(SteamLaunchOptions.write(home, 1790600, "-dx11"))
+        localConfig(home, "60974196").writeText("\"InstallConfigStore\"\n{\n}\n")
+        assertFalse(SteamLaunchOptions.write(home, 1790600, "-dx11"))
+    }
+}