add basic python writer for bmap binding

CodeGen/BMapBindings/IndentHelper.java

@@ -0,0 +1,42 @@
+import java.io.OutputStreamWriter;
+
+public class IndentHelper {
+	public IndentHelper(OutputStreamWriter writer) {
+		mIndent = 0;
+		mWriter = writer;
+	}
+
+	private int mIndent;
+	private OutputStreamWriter mWriter;
+
+	public void inc() {
+		++mIndent;
+	}
+
+	public void dec() {
+		--mIndent;
+	}
+
+	private void indent() throws Exception {
+		for (int i = 0; i < mIndent; ++i) {
+			mWriter.write("    ");
+		}
+	}
+	
+	private void lineBreak() throws Exception {
+		mWriter.write(System.lineSeparator());
+	}
+
+	public void puts(String data) throws Exception {
+		indent();
+		mWriter.write(data);
+		lineBreak();
+	}
+
+	public void printf(String fmt, Object... args) throws Exception {
+		indent();
+		mWriter.write(String.format(fmt, args));
+		lineBreak();
+	}
+
+}