feat(cli): extend Main

src/main/kotlin/kestrel/cli/Main.kt

@@ -2,9 +2,11 @@ package kestrel.cli
 
 import java.io.File
 import kestrel.persistence.Persistence
+import kestrel.store.sql.DiskCatalog
 
 fun main(arguments: Array<String>) {
     var dataDir: File? = null
+    var diskDir: File? = null
     var scriptPath: String? = null
     var index = 0
     while (index < arguments.size) {
@@ -16,13 +18,27 @@ fun main(arguments: Array<String>) {
             argument.startsWith("--data=") -> {
                 dataDir = File(argument.substringAfter('=')); index += 1
             }
+            argument == "--disk" -> {
+                diskDir = File(arguments[index + 1]); index += 2
+            }
+            argument.startsWith("--disk=") -> {
+                diskDir = File(argument.substringAfter('=')); index += 1
+            }
             else -> {
                 scriptPath = argument; index += 1
             }
         }
     }
+    if (dataDir != null && diskDir != null) {
+        System.err.println("Error: --data (in-memory engine, text WAL) and --disk (disk-backed engine) are mutually exclusive")
+        return
+    }
     val persistence = dataDir?.let { Persistence(it) }
-    val repl = Repl(persistence = persistence)
+    val diskCatalog = diskDir?.let {
+        it.mkdirs()
+        DiskCatalog.open(File(it, "kestrel.data"), File(it, "kestrel.wal"))
+    }
+    val repl = Repl(persistence = persistence, diskCatalog = diskCatalog)
     val reader = if (scriptPath != null) File(scriptPath).bufferedReader() else System.`in`.bufferedReader()
     reader.use { repl.run(it) }
 }