Adding generate subcommand. #16.

api/src/main/java/io/github/applecommander/bastools/api/shapes/ShapeTable.java

@@ -12,6 +12,7 @@ import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
+import java.util.stream.Collectors;
 
 import io.github.applecommander.bastools.api.utils.Streams;
 
@@ -59,16 +60,32 @@ public class ShapeTable {
 
     public void write(OutputStream outputStream) throws IOException {
         Objects.requireNonNull(outputStream);
-        // TODO
+        // Header
+        outputStream.write(shapes.size());
+        outputStream.write(0);
+        // Collect each shape
+        List<byte[]> data = this.shapes.stream()
+                                       .map(Shape::toVector)
+                                       .map(VectorShape::toBytes)
+                                       .collect(Collectors.toList());
+        // Build offset table
+        int offset = 2 + 2*data.size();
+        for (byte[] d : data) {
+            outputStream.write(offset & 0xff);
+            outputStream.write(offset >> 8);
+            offset += d.length;
+        }
+        // Write shape data
+        for (byte[] d : data) {
+            outputStream.write(d);
+        }
     }
-
     public void write(File file) throws IOException {
         Objects.requireNonNull(file);
         try (OutputStream outputStream = new FileOutputStream(file)) {
             write(file);
         }
     }
-
     public void write(Path path) throws IOException {
         Objects.requireNonNull(path);
         write(path.toFile());

api/src/main/java/io/github/applecommander/bastools/api/shapes/VectorShape.java

@@ -1,11 +1,13 @@
 package io.github.applecommander.bastools.api.shapes;
 
+import java.io.ByteArrayOutputStream;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Objects;
+import java.util.Optional;
 import java.util.Queue;
 
 public class VectorShape implements Shape {
@@ -97,6 +99,45 @@ public class VectorShape implements Shape {
 	    }
 	}
 	
+	public byte[] toBytes() {
+	    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+	    LinkedList<VectorCommand> work = new LinkedList<>(vectors);
+	    while (!work.isEmpty()) {
+            int section1 = work.remove().ordinal();
+	        VectorCommand vector2 = work.poll();
+            int section2 = Optional.ofNullable(vector2).map(VectorCommand::ordinal).orElse(0);
+            VectorCommand vector3 = work.poll();
+            if (vector3 != null && vector3.plot) {
+                work.add(0, vector3);
+                vector3 = null;
+            }
+            int section3 = Optional.ofNullable(vector3).map(VectorCommand::ordinal).orElse(0);
+            if ((section1 + section2 + section3) == 0) {
+                // Cannot write a 0 byte except at end
+                if (vector2 == null) {
+                    section2 = VectorCommand.MOVE_LEFT.ordinal();
+                } else if (vector3 == null) {
+                    section3 = VectorCommand.MOVE_LEFT.ordinal();
+                } else {
+                    section3 = VectorCommand.MOVE_LEFT.ordinal();
+                    if (!work.isEmpty()) {
+                        work.add(0, VectorCommand.MOVE_RIGHT);
+                    }
+                }
+            } else if (vector3 == VectorCommand.MOVE_UP) {
+                // section 3 cannot be 0
+                work.add(0, vector3);
+                if (vector2 == VectorCommand.MOVE_UP) {
+                    // section 2 and 3 cannot be 0
+                    work.add(0, vector2);
+                }
+            }
+            outputStream.write(section3 << 6 | section2 << 3 | section1);
+	    }
+	    outputStream.write(0);
+	    return outputStream.toByteArray();
+	}
+	
 	@Override
 	public boolean isEmpty() {
 	    return vectors.isEmpty();

api/src/main/java/io/github/applecommander/bastools/api/shapes/exporters/TextShapeExporter.java

@@ -52,7 +52,7 @@ public class TextShapeExporter implements ShapeExporter {
         int width = blist.stream().mapToInt(BitmapShape::getWidth).max().getAsInt();
         int height = blist.stream().mapToInt(BitmapShape::getHeight).max().getAsInt();
 
-        int columns = Math.max(1, this.maxWidth / width);
+        int columns = Math.min(Math.max(1, this.maxWidth / width), blist.size());
         
         PrintWriter pw = new PrintWriter(outputStream);
         drawTopLine(pw, columns, width);