Add Code folding on CSS style tab

shared/naturalcrit/codeEditor/fold-css.js

@@ -0,0 +1,32 @@
+module.exports = {
+	registerHomebreweryHelper : function(CodeMirror) {
+		CodeMirror.registerHelper('fold', 'homebrewerycss', function(cm, start) {
+			const startMatcher = /\{[ \t]*$/;
+			const endMatcher = /\}[ \t]*$/;
+			const prevLine = cm.getLine(start.line);
+
+			if((start.line === cm.firstLine()) && (!cm.getLine(start.line).match(startMatcher))) return null;
+
+			if(start.line === cm.firstLine() || prevLine.match(startMatcher)) {
+				const lastLineNo = cm.lastLine();
+				let end = start.line + 1;
+				let braceCount = 1;
+
+				while (end < lastLineNo) {
+					const curLine = cm.getLine(end);
+					if(curLine.match(startMatcher)) braceCount++;
+					if(curLine.match(endMatcher)) braceCount--;
+					if(braceCount == 0) break;
+					++end;
+				}
+
+				return {
+					from : CodeMirror.Pos(start.line, 0),
+					to   : CodeMirror.Pos(end, cm.getLine(end).length)
+				};
+			}
+
+			return null;
+		});
+	}
+};