Convert: create target file if it doesn't yet exist (#160)

* Convert: create target file if it doesn't yet exist

also: use with absolute filenames, otherwise 'file.exists' and friends
don't work

* fmt

core/src/main/scala/flatgraph/storage/Deserialization.scala

@@ -14,7 +14,7 @@ import scala.collection.mutable
 object Deserialization {
 
   def readGraph(storagePath: Path, schemaMaybe: Option[Schema], persistOnClose: Boolean = true): Graph = {
-    val fileChannel = new java.io.RandomAccessFile(storagePath.toFile, "r").getChannel
+    val fileChannel = new java.io.RandomAccessFile(storagePath.toAbsolutePath.toFile, "r").getChannel
     try {
       // fixme: Use convenience methods from schema to translate string->id. Fix after we get strict schema checking.
       val manifest = readManifest(fileChannel)

core/src/main/scala/flatgraph/storage/Serialization.scala

@@ -23,7 +23,7 @@ object Serialization {
 
     val fileChannel =
       new java.io.RandomAccessFile(
-        storagePath.toFile,
+        storagePath.toAbsolutePath.toFile,
         "rw"
       ).getChannel // if (conf.filename != null) { new java.io.RandomAccessFile("/tmp/foo.fg", "w").getChannel }}
     try {

odb-convert/src/main/scala/flatgraph/convert/Convert.scala

@@ -73,8 +73,13 @@ object Convert {
   }
 
   private def writeData(filename: File, nodeStuff: Array[NodeStuff], strings: Array[String]): Unit = {
-    val filePtr     = new AtomicLong(16)
-    val fileChannel = new java.io.RandomAccessFile(filename, "rw").getChannel
+    val fileAbsolute = filename.getAbsoluteFile
+    val filePtr      = new AtomicLong(16)
+    if (!fileAbsolute.exists()) {
+      fileAbsolute.getParentFile.mkdirs()
+      fileAbsolute.createNewFile()
+    }
+    val fileChannel = new java.io.RandomAccessFile(fileAbsolute, "rw").getChannel
     try {
       val nodes      = nodeStuff.map { ns => new Manifest.NodeItem(ns.label, ns.nextId, null) }
       val edges      = mutable.ArrayBuffer[Manifest.EdgeItem]()