Merge pull request #1792 from jeddai/code-folding

Add code folding feature for all content within a single page

client/homebrew/editor/editor.jsx

@@ -108,7 +108,7 @@ const Editor = createClass({
 			const codeMirror = this.refs.codeEditor.codeMirror;
 
 			//reset custom text styles
-			const customHighlights = codeMirror.getAllMarks();
+			const customHighlights = codeMirror.getAllMarks().filter((mark)=>!mark.__isFold); //Don't undo code folding
 			for (let i=0;i<customHighlights.length;i++) customHighlights[i].clear();
 
 			const lineNumbers = _.reduce(this.props.brew.text.split('\n'), (r, line, lineNumber)=>{

scripts/project.json

@@ -12,6 +12,8 @@
 		"codemirror/mode/gfm/gfm.js",
 		"codemirror/mode/css/css.js",
 		"codemirror/mode/javascript/javascript.js",
+		"codemirror/addon/fold/foldcode.js",
+		"codemirror/addon/fold/foldgutter.js",
 		"moment",
 		"superagent",
 		"marked"

shared/naturalcrit/codeEditor/codeEditor.jsx

@@ -13,6 +13,13 @@ if(typeof navigator !== 'undefined'){
 	require('codemirror/mode/gfm/gfm.js'); //Github flavoured markdown
 	require('codemirror/mode/css/css.js');
 	require('codemirror/mode/javascript/javascript.js');
+
+	//Addons
+	require('codemirror/addon/fold/foldcode.js');
+	require('codemirror/addon/fold/foldgutter.js');
+
+	const foldCode = require('./fold-code');
+	foldCode.registerHomebreweryHelper(CodeMirror);
 }
 
 const CodeEditor = createClass({
@@ -74,8 +81,35 @@ const CodeEditor = createClass({
 				'Ctrl-M' : this.makeSpan,
 				'Cmd-M'  : this.makeSpan,
 				'Ctrl-/' : this.makeComment,
-				'Cmd-/'  : this.makeComment
+				'Cmd-/'  : this.makeComment,
-			}
+				'Ctrl-[' : this.foldAllCode,
+				'Cmd-['  : this.foldAllCode,
+				'Ctrl-]' : this.unfoldAllCode,
+				'Cmd-]'  : this.unfoldAllCode
+			},
+			foldGutter  : true,
+			foldOptions : {
+				scanUp      : true,
+				rangeFinder : CodeMirror.fold.homebrewery,
+				widget      : (from, to)=>{
+					let text = '';
+					let currentLine = from.line;
+					const maxLength = 50;
+					while (currentLine <= to.line && text.length <= maxLength) {
+						text += this.codeMirror.getLine(currentLine);
+						if(currentLine < to.line)
+							text += ' ';
+						currentLine += 1;
+					}
+
+					text = text.trim();
+					if(text.length > maxLength)
+						text = `${text.substr(0, maxLength)}...`;
+
+					return `\u21A4 ${text} \u21A6`;
+				}
+			},
+			gutters : ['CodeMirror-linenumbers', 'CodeMirror-foldgutter']
 		});
 
 		// Note: codeMirror passes a copy of itself in this callback. cm === this.codeMirror. Either one works.
@@ -119,6 +153,14 @@ const CodeEditor = createClass({
 		}
 	},
 
+	foldAllCode : function() {
+		this.codeMirror.execCommand('foldAll');
+	},
+
+	unfoldAllCode : function() {
+		this.codeMirror.execCommand('unfoldAll');
+	},
+
 	//=-- Externally used -==//
 	setCursorPosition : function(line, char){
 		setTimeout(()=>{

shared/naturalcrit/codeEditor/codeEditor.less

@@ -1,5 +1,10 @@
 @import (less) 'codemirror/lib/codemirror.css';
+@import (less) 'codemirror/addon/fold/foldgutter.css';
 
 .codeEditor{
-
+  .CodeMirror-foldmarker {
+    font-family: inherit;
+    text-shadow: none;
+    font-weight: 600;
+  }
 }

shared/naturalcrit/codeEditor/fold-code.js

@@ -0,0 +1,26 @@
+module.exports = {
+	registerHomebreweryHelper : function(CodeMirror) {
+		CodeMirror.registerHelper('fold', 'homebrewery', function(cm, start) {
+			const matcher = /^\\page.*/;
+			const prevLine = cm.getLine(start.line - 1);
+
+			if(start.line === cm.firstLine() || prevLine.match(matcher)) {
+				const lastLineNo = cm.lastLine();
+				let end = start.line;
+
+				while (end < lastLineNo) {
+					if(cm.getLine(end + 1).match(matcher))
+						break;
+					++end;
+				}
+
+				return {
+					from : CodeMirror.Pos(start.line, 0),
+					to   : CodeMirror.Pos(end, cm.getLine(end).length)
+				};
+			}
+
+			return null;
+		});
+	}
+};