Python autoindent support and fix to Python Fold Parser

RSyntaxTextArea/src/main/java/org/fife/ui/rsyntaxtextarea/folding/PythonFoldParser.java

@@ -50,8 +50,16 @@ public List<Fold> getFolds(RSyntaxTextArea textArea) {
 					currentNextFoldStart = t.getOffset() + leadingWhiteSpaceCount;
 				}
 
+				// need to create a fold of some sort
 				else if (leadingWhiteSpaceCount > currentLeadingWhiteSpaceCount) {
 
+					// look forward if it is a line continuation
+					while (tokenHasLineContinuation(t) && (line < lineCount)) {
+						line ++;
+						t = textArea.getTokenListForLine(line);
+						//currentNextFoldStart = t.getOffset();
+					}
+
 					if (currentFold != null) {
 						currentFold = currentFold.createChild(FoldType.CODE,
 							currentNextFoldStart);
@@ -80,10 +88,8 @@ else if (leadingWhiteSpaceCount > currentLeadingWhiteSpaceCount) {
 					int endOffs = t.getEndOffset() - 1;
 
 					boolean foundBlock = false;
-					while (!foldStartLeadingWhiteSpaceCounts.isEmpty() &&
+					while (currentFold != null && !foldStartLeadingWhiteSpaceCounts.isEmpty() &&
 							foldStartLeadingWhiteSpaceCounts.peek() >= leadingWhiteSpaceCount) {
-						// IntelliJ can't tell, but it's not possible for currentFold to be
-						// null here
 						currentFold.setEndOffset(endOffs);
 						currentFold = currentFold.getParent();
 						foldStartLeadingWhiteSpaceCounts.pop();
@@ -106,6 +112,11 @@ else if (leadingWhiteSpaceCount > currentLeadingWhiteSpaceCount) {
 		return folds;
 	}
 
+	private static 	boolean tokenHasLineContinuation(Token t) {
+		t = t.getLastNonCommentNonWhitespaceToken();
+		return t!= null && t.isSingleChar('\\');
+	}
+
 	private static int getLeadingWhiteSpaceCount(Token t, int tabSize) {
 
 		// Lines continuing a multi-line string or char don't count
@@ -118,7 +129,7 @@ private static int getLeadingWhiteSpaceCount(Token t, int tabSize) {
 		int count = 0;
 		while (t != null && t.isPaintable()) {
 			if (!t.isWhitespace()) {
-				// Note Python doesn't nave multi-line comments so we don't
+				// Note Python doesn't nave multi-line comments, so we don't
 				// have to worry about MLD's
 				return t.getType() == TokenTypes.COMMENT_EOL ? -1 : count;
 			}

RSyntaxTextArea/src/main/java/org/fife/ui/rsyntaxtextarea/modes/PythonTokenMaker.flex

@@ -90,6 +90,16 @@ import org.fife.ui.rsyntaxtextarea.TokenImpl;
 	}
 
 
+	@Override
+	public boolean getShouldIndentNextLineAfter(Token t) {
+		if (t!=null && t.length()==1) {
+			char ch = t.charAt(0);
+			return ch==':' || ch=='\\';
+		}
+		return false;
+	}
+
+
 	/**
 	 * Returns the first token in the linked list of tokens generated
 	 * from <code>text</code>.  This method must be implemented by

RSyntaxTextArea/src/test/java/org/fife/ui/rsyntaxtextarea/folding/PythonFoldParserTest.java

@@ -48,7 +48,8 @@ void testGetFold_happyPath() {
 			"\n" +
 			"def Greg2JD(year, month, day):\n" +
 			"\n" +
-			"    if (month < 3):\n" +
+			"    if (month < 3) \\\\ \n" +
+			"and true:\n" +
 			"        y = float(year) - 1.0\n" +
 			"        m = float(month) + 12.0\n";