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| 1 | +package io.github.kdroidfilter.platformtools.darkmodedetector.linux |
| 2 | + |
| 3 | +import androidx.compose.runtime.Composable |
| 4 | +import androidx.compose.runtime.DisposableEffect |
| 5 | +import androidx.compose.runtime.mutableStateOf |
| 6 | +import androidx.compose.runtime.remember |
| 7 | +import co.touchlab.kermit.Logger |
| 8 | +import co.touchlab.kermit.Logger.Companion.setMinSeverity |
| 9 | +import co.touchlab.kermit.Severity |
| 10 | +import java.io.BufferedReader |
| 11 | +import java.io.InputStreamReader |
| 12 | +import java.util.concurrent.ConcurrentHashMap |
| 13 | +import java.util.function.Consumer |
| 14 | + |
| 15 | +// Logger for GNOME |
| 16 | +private val gnomeLogger = Logger.withTag("GnomeThemeDetector").apply { setMinSeverity(Severity.Warn) } |
| 17 | + |
| 18 | +/** |
| 19 | + * GNOME specific theme detector using gsettings and monitoring. |
| 20 | + */ |
| 21 | +internal object GnomeThemeDetector { |
| 22 | + private const val MONITORING_CMD = "gsettings monitor org.gnome.desktop.interface" |
| 23 | + private val GET_CMD = arrayOf( |
| 24 | + "gsettings get org.gnome.desktop.interface gtk-theme", |
| 25 | + "gsettings get org.gnome.desktop.interface color-scheme" |
| 26 | + ) |
| 27 | + |
| 28 | + val darkThemeRegex = ".*dark.*".toRegex(RegexOption.IGNORE_CASE) |
| 29 | + |
| 30 | + @Volatile |
| 31 | + private var detectorThread: Thread? = null |
| 32 | + private val listeners: MutableSet<Consumer<Boolean>> = ConcurrentHashMap.newKeySet() |
| 33 | + |
| 34 | + fun isDark(): Boolean { |
| 35 | + return try { |
| 36 | + val runtime = Runtime.getRuntime() |
| 37 | + for (cmd in GET_CMD) { |
| 38 | + val process = runtime.exec(cmd) |
| 39 | + BufferedReader(InputStreamReader(process.inputStream)).use { reader -> |
| 40 | + val line = reader.readLine() |
| 41 | + gnomeLogger.d { "Command '$cmd' output: $line" } |
| 42 | + if (line != null && isDarkTheme(line)) { |
| 43 | + return true |
| 44 | + } |
| 45 | + } |
| 46 | + } |
| 47 | + false |
| 48 | + } catch (e: Exception) { |
| 49 | + gnomeLogger.e(e) { "Couldn't detect GNOME theme" } |
| 50 | + false |
| 51 | + } |
| 52 | + } |
| 53 | + |
| 54 | + private fun startMonitoring() { |
| 55 | + if (detectorThread?.isAlive == true) return |
| 56 | + detectorThread = object : Thread("GTK Theme Detector Thread") { |
| 57 | + private var lastValue: Boolean = isDark() |
| 58 | + override fun run() { |
| 59 | + gnomeLogger.d { "Starting GTK theme monitoring thread" } |
| 60 | + val runtime = Runtime.getRuntime() |
| 61 | + val process = try { |
| 62 | + runtime.exec(MONITORING_CMD) |
| 63 | + } catch (e: Exception) { |
| 64 | + gnomeLogger.e(e) { "Couldn't start monitoring process" } |
| 65 | + return |
| 66 | + } |
| 67 | + |
| 68 | + BufferedReader(InputStreamReader(process.inputStream)).use { reader -> |
| 69 | + while (!isInterrupted) { |
| 70 | + val line = reader.readLine() ?: break |
| 71 | + if (!line.contains("gtk-theme", ignoreCase = true) && |
| 72 | + !line.contains("color-scheme", ignoreCase = true) |
| 73 | + ) continue |
| 74 | + |
| 75 | + gnomeLogger.d { "Monitoring output: $line" } |
| 76 | + val currentIsDark = isDarkThemeFromLine(line) ?: isDark() |
| 77 | + if (currentIsDark != lastValue) { |
| 78 | + lastValue = currentIsDark |
| 79 | + gnomeLogger.d { "Detected theme change => dark: $currentIsDark" } |
| 80 | + for (listener in listeners) { |
| 81 | + try { listener.accept(currentIsDark) } catch (ex: RuntimeException) { |
| 82 | + gnomeLogger.e(ex) { "Exception while notifying listener" } |
| 83 | + } |
| 84 | + } |
| 85 | + } |
| 86 | + } |
| 87 | + gnomeLogger.d { "GTK theme monitoring thread ending" } |
| 88 | + if (process.isAlive) { |
| 89 | + process.destroy() |
| 90 | + gnomeLogger.d { "Monitoring process destroyed" } |
| 91 | + } |
| 92 | + } |
| 93 | + } |
| 94 | + }.apply { isDaemon = true; start() } |
| 95 | + } |
| 96 | + |
| 97 | + private fun isDarkThemeFromLine(line: String): Boolean? { |
| 98 | + val tokens = line.split("\\s+".toRegex()) |
| 99 | + if (tokens.size < 2) return null |
| 100 | + val value = tokens[1].lowercase().replace("'", "") |
| 101 | + return if (value.isNotBlank()) isDarkTheme(value) else null |
| 102 | + } |
| 103 | + |
| 104 | + private fun isDarkTheme(text: String): Boolean = darkThemeRegex.matches(text) |
| 105 | + |
| 106 | + fun registerListener(listener: Consumer<Boolean>) { |
| 107 | + val wasEmpty = listeners.isEmpty() |
| 108 | + listeners.add(listener) |
| 109 | + if (wasEmpty) { |
| 110 | + startMonitoring() |
| 111 | + } |
| 112 | + } |
| 113 | + |
| 114 | + fun removeListener(listener: Consumer<Boolean>) { |
| 115 | + listeners.remove(listener) |
| 116 | + if (listeners.isEmpty()) { |
| 117 | + detectorThread?.interrupt() |
| 118 | + detectorThread = null |
| 119 | + } |
| 120 | + } |
| 121 | +} |
| 122 | + |
| 123 | +internal fun detectGnomeDarkTheme(): Boolean? { |
| 124 | + return try { |
| 125 | + val p1 = Runtime.getRuntime().exec(arrayOf("gsettings", "get", "org.gnome.desktop.interface", "gtk-theme")) |
| 126 | + val theme = BufferedReader(InputStreamReader(p1.inputStream)).use { it.readLine()?.trim('\'', '"') } |
| 127 | + if (!theme.isNullOrBlank() && theme.contains("dark", ignoreCase = true)) return true |
| 128 | + val p2 = Runtime.getRuntime().exec(arrayOf("gsettings", "get", "org.gnome.desktop.interface", "color-scheme")) |
| 129 | + val scheme = BufferedReader(InputStreamReader(p2.inputStream)).use { it.readLine()?.trim('\'', '"') } |
| 130 | + when (scheme?.lowercase()) { |
| 131 | + "prefer-dark" -> true |
| 132 | + "default", "prefer-light" -> false |
| 133 | + else -> null |
| 134 | + } |
| 135 | + } catch (_: Exception) { |
| 136 | + null |
| 137 | + } |
| 138 | +} |
| 139 | + |
| 140 | +@Composable |
| 141 | +internal fun isGnomeInDarkMode(): Boolean { |
| 142 | + val darkModeState = remember { mutableStateOf(GnomeThemeDetector.isDark()) } |
| 143 | + |
| 144 | + DisposableEffect(Unit) { |
| 145 | + gnomeLogger.d { "Registering GNOME dark mode listener in Compose" } |
| 146 | + val listener = Consumer<Boolean> { newValue -> |
| 147 | + gnomeLogger.d { "GNOME dark mode updated: $newValue" } |
| 148 | + darkModeState.value = newValue |
| 149 | + } |
| 150 | + GnomeThemeDetector.registerListener(listener) |
| 151 | + onDispose { |
| 152 | + gnomeLogger.d { "Removing GNOME dark mode listener in Compose" } |
| 153 | + GnomeThemeDetector.removeListener(listener) |
| 154 | + } |
| 155 | + } |
| 156 | + return darkModeState.value |
| 157 | +} |
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