adjustable indentation

dist/docs/readme.txt

@@ -67,7 +67,7 @@ urc    : full name of user-supplied class implementing IIdentifierRenamer. It is
 inn (1): check for IntelliJ IDEA-specific @NotNull annotation and remove inserted code if found
 lac (0): decompile lambda expressions to anonymous classes
 nls (0): define new line character to be used for output. 0 - '\r\n' (Windows), 1 - '\n' (Linux) 
-         
+ind    : indentation string (default is "   " (3 spaces))
  
 The default logging level is INFO. This value can be overwritten by setting the option 'log' as follows:
 

src/de/fernflower/main/DecompilerContext.java

@@ -87,6 +87,7 @@ public class DecompilerContext {
 		mapDefault.put(IFernflowerPreferences.REMOVE_EMPTY_RANGES, "1"); 
 		
 		mapDefault.put(IFernflowerPreferences.NEW_LINE_SEPARATOR, "0");
+		mapDefault.put(IFernflowerPreferences.INDENT_STRING, "   ");
 
 		mapDefault.put(IFernflowerPreferences.IDEA_NOT_NULL_ANNOTATION, "1");
 		

src/de/fernflower/main/extern/IFernflowerPreferences.java

@@ -50,6 +50,7 @@ public interface IFernflowerPreferences {
 	public static final String NEW_LINE_SEPARATOR = "nls";
 	public static final String IDEA_NOT_NULL_ANNOTATION = "inn";
 	public static final String LAMBDA_TO_ANONYMOUS_CLASS = "lac";
+  public static final String INDENT_STRING = "ind";
 
 	public static final String LINE_SEPARATOR_WIN = "\r\n";
 	public static final String LINE_SEPARATOR_LIN = "\n";

src/de/fernflower/util/InterpreterUtil.java

@@ -25,9 +25,10 @@ import java.util.Collection;
 import java.util.HashSet;
 import java.util.List;
 
-public class InterpreterUtil {
+import de.fernflower.main.DecompilerContext;
+import de.fernflower.main.extern.IFernflowerPreferences;
 
-	public static final String INDENT_STRING = "   ";
+public class InterpreterUtil {
 	
 	public static void copyFile(File in, File out) throws IOException {
 		FileChannel inChannel = new FileInputStream(in).getChannel();
@@ -65,9 +66,10 @@ public class InterpreterUtil {
 	}
 	
 	public static String getIndentString(int length) {
-		StringBuffer buf = new StringBuffer();
+    String indent = (String) DecompilerContext.getProperty(IFernflowerPreferences.INDENT_STRING);
+    StringBuilder buf = new StringBuilder();
 		while(length-->0) {
-			buf.append(INDENT_STRING);
+			buf.append(indent);
 		}
 		return buf.toString(); 
 	}