fix prettyprinter bug

TODO.FACTOR.txt

@@ -1,7 +1,5 @@
 72/73:
 
-- keep a list of getter/setter words
-- default constructor
 - move tuple to generic vocab
 - update plugin docs
 - extract word keeps indent

factor/jedit/FactorShell.java

@@ -203,7 +203,11 @@ public class FactorShell extends Shell
 			output.print(console.getInfoColor(),
 				jEdit.getProperty("factor.shell.opening"));
 
-			stream = FactorPlugin.getExternalInstance().openStream();
+			stream = null;
+			ExternalFactor external = FactorPlugin.getExternalInstance();
+			if(external != null)
+				stream = external.openStream();
+
 			if(stream == null)
 			{
 				output.print(console.getInfoColor(),

factor/jedit/WordPreview.java

@@ -134,6 +134,9 @@ public class WordPreview implements ActionListener, CaretListener
 		if(SideKickPlugin.isParsingBuffer(view.getBuffer()))
 			return;
 
+		if(!view.getBuffer().isLoaded())
+			return;
+
 		FactorParsedData data = FactorPlugin.getParsedData(view);
 		if(data != null)
 		{

library/syntax/prettyprint.factor

@@ -108,8 +108,12 @@ M: word prettyprint* ( indent word -- indent )
 
 M: list prettyprint* ( indent list -- indent )
     [
-        \ [ swap \ ] prettyprint-sequence
-    ] check-recursion ;
+        [
+            \ [ swap \ ] prettyprint-sequence
+        ] check-recursion
+    ] [
+        f unparse write
+    ] ifte* ;
 
 M: cons prettyprint* ( indent cons -- indent )
     #! Here we turn the cons into a list of two elements.