Fixes soywiz-archive/korge-next#85

The by lazy were computed before customCwd as set by the korge gradle plugin

korio/src/commonMain/kotlin/com/soywiz/korio/file/std/DynamicRootVfs.kt

@@ -0,0 +1,11 @@
+package com.soywiz.korio.file.std
+
+import com.soywiz.korio.file.*
+
+fun DynamicRootVfs(base: Vfs, rootGet: () -> String) = DynamicRootVfsVfs(base, rootGet).root
+
+class DynamicRootVfsVfs(val base: Vfs, val rootGet: () -> String) : Vfs.Proxy() {
+    private fun getLocalAbsolutePath(path: String) = rootGet().pathInfo.lightCombine(path.pathInfo).fullPath
+    override fun getAbsolutePath(path: String): String = base.getAbsolutePath(getLocalAbsolutePath(path))
+    override suspend fun access(path: String): VfsFile = base[getLocalAbsolutePath(path)]
+}

korio/src/commonTest/kotlin/com/soywiz/korio/file/std/DynamicRootVfsTest.kt

@@ -0,0 +1,17 @@
+package com.soywiz.korio.file.std
+
+import com.soywiz.korio.async.*
+import kotlin.test.*
+
+class DynamicRootVfsTest {
+    @Test
+    fun test() = suspendTest {
+        val memoryVfs = MemoryVfsMix("path0/demo" to "world")
+        var base = "/path0"
+        val root = DynamicRootVfs(memoryVfs.vfs) { base }
+        assertEquals("/path0/demo", root["demo"].absolutePath)
+        assertEquals("world", root["demo"].readString())
+        base = "/path1"
+        assertEquals("/path1/test", root["test"].absolutePath)
+    }
+}

korio/src/nativeCommonMain/kotlin/com/soywiz/korio/file/std/LocalVfsNative.kt

@@ -31,18 +31,23 @@ import com.soywiz.korio.process.posixExec
 val tmpdir: String by lazy { Environment["TMPDIR"] ?: Environment["TEMP"] ?: Environment["TMP"] ?: "/tmp" }
 
 var customCwd: String? = null
-val cwd: String by lazy { customCwd ?: com.soywiz.korio.nativeCwd() }
+val nativeCwd by lazy { com.soywiz.korio.nativeCwd() }
+val cwd: String get() = customCwd ?: nativeCwd
 
-actual val resourcesVfs: VfsFile by lazy { applicationDataVfs.jail() }
-actual val rootLocalVfs: VfsFile by lazy { localVfs(cwd) }
-actual val applicationVfs: VfsFile by lazy { localVfs(cwd) }
-actual val applicationDataVfs: VfsFile by lazy { localVfs(cwd) }
+val cwdVfs: VfsFile by lazy { DynamicRootVfs(rootLocalVfsNative) { cwd } }
+actual val resourcesVfs: VfsFile by lazy { cwdVfs.jail() }
 actual val cacheVfs: VfsFile by lazy { MemoryVfs() }
-actual val externalStorageVfs: VfsFile by lazy { localVfs(cwd) }
-actual val userHomeVfs: VfsFile by lazy { localVfs(cwd) }
 actual val tempVfs: VfsFile by lazy { localVfs(tmpdir) }
 
-actual fun localVfs(path: String): VfsFile = LocalVfsNative()[path]
+actual val rootLocalVfs: VfsFile get() = cwdVfs
+actual val applicationVfs: VfsFile get() = cwdVfs
+actual val applicationDataVfs: VfsFile get() = cwdVfs
+actual val externalStorageVfs: VfsFile get() = cwdVfs
+actual val userHomeVfs: VfsFile get() = cwdVfs
+
+val rootLocalVfsNative by lazy { LocalVfsNative() }
+
+actual fun localVfs(path: String): VfsFile = rootLocalVfsNative[path]
 
 private val IOWorker by lazy { Worker.start().also { kotlin.native.Platform.isMemoryLeakCheckerActive = false } }