diff --git a/src/diagrams/gitGraph/gitGraphAst.js b/src/diagrams/gitGraph/gitGraphAst.js
index 8277d66e7..bef441067 100644
--- a/src/diagrams/gitGraph/gitGraphAst.js
+++ b/src/diagrams/gitGraph/gitGraphAst.js
@@ -1,5 +1,5 @@
 var Logger = require('../../logger');
-var _ = require("lodash");
+var _ = require('lodash');
 
 //var log = new Logger.Log();
 var log = new Logger.Log(1);
@@ -7,16 +7,16 @@ var log = new Logger.Log(1);
 
 var commits = {};
 var head  = null;
-var branches = { "master" : head };
-var curBranch = "master";
-var direction = "LR";
+var branches = { 'master' : head };
+var curBranch = 'master';
+var direction = 'LR';
 var seq = 0;
 function getRandomInt(min, max) {
   return Math.floor(Math.random() * (max - min)) + min;
 }
 function getId() {
-    var pool="0123456789abcdef";
-    var id = "";
+    var pool='0123456789abcdef';
+    var id = '';
     for (var i = 0; i < 7; i++) {
         id += pool[getRandomInt(0,16)]
     }
@@ -25,12 +25,12 @@ function getId() {
 
 
 function isfastforwardable(currentCommit, otherCommit) {
-    log.debug("Entering isfastforwardable:", currentCommit.id, otherCommit.id);
+    log.debug('Entering isfastforwardable:', currentCommit.id, otherCommit.id);
     while (currentCommit.seq <= otherCommit.seq && currentCommit != otherCommit) {
         // only if other branch has more commits
         if (otherCommit.parent == null) break;
         if (Array.isArray(otherCommit.parent)){
-            log.debug("In merge commit:", otherCommit.parent);
+            log.debug('In merge commit:', otherCommit.parent);
             return isfastforwardable(currentCommit, commits[otherCommit.parent[0]]) ||
                     isfastforwardable(currentCommit, commits[otherCommit.parent[1]])
         } else {
@@ -53,13 +53,13 @@ exports.setDirection = function(dir) {
 }
 var options = {};
 exports.setOptions = function(rawOptString) {
-    log.debug("options str", rawOptString);
+    log.debug('options str', rawOptString);
     rawOptString = rawOptString && rawOptString.trim();
-    rawOptString = rawOptString || "{}";
+    rawOptString = rawOptString || '{}';
     try {
         options = JSON.parse(rawOptString)
     } catch(e) {
-        log.error("error while parsing gitGraph options", e.message);
+        log.error('error while parsing gitGraph options', e.message);
     }
 }
 
@@ -75,19 +75,19 @@ exports.commit = function(msg) {
     head = commit;
     commits[commit.id] = commit;
     branches[curBranch] = commit.id;
-    log.debug("in pushCommit '" + commit.id + "'");
+    log.debug('in pushCommit ' + commit.id);
 }
 
 exports.branch = function(name) {
     branches[name] = head != null ? head.id: null;
-    log.debug("in createBranch");
+    log.debug('in createBranch');
 }
 
 exports.merge = function(otherBranch) {
     var currentCommit = commits[branches[curBranch]];
     var otherCommit = commits[branches[otherBranch]];
     if (isReachableFrom(currentCommit, otherCommit)) {
-        log.debug("Already merged");
+        log.debug('Already merged');
         return;
     }
     if (isfastforwardable(currentCommit, otherCommit)){
@@ -106,18 +106,18 @@ exports.merge = function(otherBranch) {
         branches[curBranch] = commit.id;
     }
     log.debug(branches);
-    log.debug("in mergeBranch");
+    log.debug('in mergeBranch');
 }
 
 exports.checkout = function(branch) {
-    log.debug("in checkout");
+    log.debug('in checkout');
     curBranch = branch;
     var id = branches[curBranch];
     head = commits[id];
 }
 
 exports.reset = function(ref) {
-    log.debug("in reset");
+    log.debug('in reset');
     var commit = ref == 'HEAD' ? head : commits[branches[ref]];
     head = commit;
     branches[curBranch] = commit.id;
@@ -131,15 +131,16 @@ function upsert(arr, key, newval) {
         arr.push(newval);
     }
     //console.log(arr);
-};
+}
+
 function prettyPrintCommitHistory(commitArr) {
     var commit = _.maxBy(commitArr, 'seq');
-    var line = "";
+    var line = '';
     _.each(commitArr, function(c, idx) {
         if (c == commit) {
-            line += "\t*"
+            line += '\t*'
         } else {
-            line +="\t|"
+            line +='\t|'
         }
     });
     var label = [line, commit.id, commit.seq];
@@ -172,13 +173,13 @@ exports.prettyPrint = function() {
 exports.clear = function () {
     commits = {};
     head  = null;
-    branches = { "master" : head };
-    curBranch = "master";
+    branches = { 'master' : head };
+    curBranch = 'master';
     seq =0;
 }
 exports.getBranchesAsObjArray = function() {
     return _.map(branches, function(v,k) {
-        return {"name": k, "commit": commits[v]};
+        return {'name': k, 'commit': commits[v]};
     });
 }
 exports.getBranches = function() { return branches; }
diff --git a/src/diagrams/gitGraph/gitGraphParser.spec.js b/src/diagrams/gitGraph/gitGraphParser.spec.js
index 43462f6bb..9cb56bd1b 100644
--- a/src/diagrams/gitGraph/gitGraphParser.spec.js
+++ b/src/diagrams/gitGraph/gitGraphParser.spec.js
@@ -1,7 +1,7 @@
 var parser = require('./parser/gitGraph').parser;
-var ast = require("./gitGraphAst.js");
+var ast = require('./gitGraphAst.js');
 describe('when parsing a gitGraph',function() {
-    "use strict";
+    'use strict';
     beforeEach(function () {
         parser.yy = ast;
         parser.yy.clear();
@@ -15,8 +15,8 @@ describe('when parsing a gitGraph',function() {
         //console.log(commits);
 
         expect(Object.keys(commits).length).toBe(1);
-        expect(parser.yy.getCurrentBranch()).toBe("master");
-        expect(parser.yy.getDirection()).toBe("LR");
+        expect(parser.yy.getCurrentBranch()).toBe('master');
+        expect(parser.yy.getDirection()).toBe('LR');
         expect(Object.keys(parser.yy.getBranches()).length).toBe(1);
     });
 
@@ -32,8 +32,8 @@ describe('when parsing a gitGraph',function() {
 
         expect(parser.yy.getOptions()).toEqual({});
         expect(Object.keys(commits).length).toBe(1);
-        expect(parser.yy.getCurrentBranch()).toBe("master");
-        expect(parser.yy.getDirection()).toBe("LR");
+        expect(parser.yy.getCurrentBranch()).toBe('master');
+        expect(parser.yy.getDirection()).toBe('LR');
         expect(Object.keys(parser.yy.getBranches()).length).toBe(1);
     });
 
@@ -47,11 +47,11 @@ describe('when parsing a gitGraph',function() {
         parser.parse(str);
         var commits = parser.yy.getCommits();
         //console.log(commits);
-        console.log("options object", parser.yy.getOptions());
-        expect(parser.yy.getOptions()["key"]).toBe("value");
+        console.log('options object', parser.yy.getOptions());
+        expect(parser.yy.getOptions()['key']).toBe('value');
         expect(Object.keys(commits).length).toBe(1);
-        expect(parser.yy.getCurrentBranch()).toBe("master");
-        expect(parser.yy.getDirection()).toBe("LR");
+        expect(parser.yy.getCurrentBranch()).toBe('master');
+        expect(parser.yy.getDirection()).toBe('LR');
         expect(Object.keys(parser.yy.getBranches()).length).toBe(1);
     });
 
@@ -66,8 +66,8 @@ describe('when parsing a gitGraph',function() {
         var commits = parser.yy.getCommits();
         //console.log(commits);
         expect(Object.keys(commits).length).toBe(1);
-        expect(parser.yy.getCurrentBranch()).toBe("master");
-        expect(parser.yy.getDirection()).toBe("LR");
+        expect(parser.yy.getCurrentBranch()).toBe('master');
+        expect(parser.yy.getDirection()).toBe('LR');
         expect(Object.keys(parser.yy.getBranches()).length).toBe(1);
     });
 
@@ -80,8 +80,8 @@ describe('when parsing a gitGraph',function() {
         //console.log(commits);
 
         expect(Object.keys(commits).length).toBe(1);
-        expect(parser.yy.getCurrentBranch()).toBe("master");
-        expect(parser.yy.getDirection()).toBe("TB");
+        expect(parser.yy.getCurrentBranch()).toBe('master');
+        expect(parser.yy.getDirection()).toBe('TB');
         expect(Object.keys(parser.yy.getBranches()).length).toBe(1);
     });
 
@@ -94,7 +94,7 @@ describe('when parsing a gitGraph',function() {
         var commits = parser.yy.getCommits();
 
         expect(Object.keys(commits).length).toBe(0);
-        expect(parser.yy.getCurrentBranch()).toBe("new");
+        expect(parser.yy.getCurrentBranch()).toBe('new');
     });
 
     it('should add commits to checked out branch', function () {
@@ -108,7 +108,7 @@ describe('when parsing a gitGraph',function() {
         var commits = parser.yy.getCommits();
 
         expect(Object.keys(commits).length).toBe(2);
-        expect(parser.yy.getCurrentBranch()).toBe("new");
+        expect(parser.yy.getCurrentBranch()).toBe('new');
         var branchCommit = parser.yy.getBranches()['new'];
         expect(branchCommit).not.toBeNull();
         expect(commits[branchCommit].parent).not.toBeNull();
@@ -123,8 +123,8 @@ describe('when parsing a gitGraph',function() {
 
         expect(Object.keys(commits).length).toBe(1);
         var key = Object.keys(commits)[0];
-        expect(commits[key].message).toBe("a commit");
-        expect(parser.yy.getCurrentBranch()).toBe("master");
+        expect(commits[key].message).toBe('a commit');
+        expect(parser.yy.getCurrentBranch()).toBe('master');
     });
 
     it('it should reset a branch', function () {
@@ -140,9 +140,9 @@ describe('when parsing a gitGraph',function() {
 
         var commits = parser.yy.getCommits();
         expect(Object.keys(commits).length).toBe(3);
-        expect(parser.yy.getCurrentBranch()).toBe("newbranch");
-        expect(parser.yy.getBranches()["newbranch"]).toEqual(parser.yy.getBranches()["master"]);
-        expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()["newbranch"]);
+        expect(parser.yy.getCurrentBranch()).toBe('newbranch');
+        expect(parser.yy.getBranches()['newbranch']).toEqual(parser.yy.getBranches()['master']);
+        expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()['newbranch']);
     });
 
     it('it should handle fast forwardable merges', function () {
@@ -160,9 +160,9 @@ describe('when parsing a gitGraph',function() {
         var commits = parser.yy.getCommits();
         //console.log(commits);
         expect(Object.keys(commits).length).toBe(3);
-        expect(parser.yy.getCurrentBranch()).toBe("master");
-        expect(parser.yy.getBranches()["newbranch"]).toEqual(parser.yy.getBranches()["master"]);
-        expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()["newbranch"]);
+        expect(parser.yy.getCurrentBranch()).toBe('master');
+        expect(parser.yy.getBranches()['newbranch']).toEqual(parser.yy.getBranches()['master']);
+        expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()['newbranch']);
     });
 
     it('it should handle cases when merge is a noop', function () {
@@ -179,9 +179,9 @@ describe('when parsing a gitGraph',function() {
         var commits = parser.yy.getCommits();
         //console.log(commits);
         expect(Object.keys(commits).length).toBe(3);
-        expect(parser.yy.getCurrentBranch()).toBe("newbranch");
-        expect(parser.yy.getBranches()["newbranch"]).not.toEqual(parser.yy.getBranches()["master"]);
-        expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()["newbranch"]);
+        expect(parser.yy.getCurrentBranch()).toBe('newbranch');
+        expect(parser.yy.getBranches()['newbranch']).not.toEqual(parser.yy.getBranches()['master']);
+        expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()['newbranch']);
     });
 
     it('it should handle merge with 2 parents', function () {
@@ -200,9 +200,9 @@ describe('when parsing a gitGraph',function() {
         var commits = parser.yy.getCommits();
         //console.log(commits);
         expect(Object.keys(commits).length).toBe(5);
-        expect(parser.yy.getCurrentBranch()).toBe("master");
-        expect(parser.yy.getBranches()["newbranch"]).not.toEqual(parser.yy.getBranches()["master"]);
-        expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()["master"]);
+        expect(parser.yy.getCurrentBranch()).toBe('master');
+        expect(parser.yy.getBranches()['newbranch']).not.toEqual(parser.yy.getBranches()['master']);
+        expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()['master']);
     });
 
     it('it should handle ff merge when history walk has two parents (merge commit)', function () {
@@ -224,9 +224,9 @@ describe('when parsing a gitGraph',function() {
         var commits = parser.yy.getCommits();
         //console.log(commits);
         expect(Object.keys(commits).length).toBe(6);
-        expect(parser.yy.getCurrentBranch()).toBe("newbranch");
-        expect(parser.yy.getBranches()["newbranch"]).toEqual(parser.yy.getBranches()["master"]);
-        expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()["master"]);
+        expect(parser.yy.getCurrentBranch()).toBe('newbranch');
+        expect(parser.yy.getBranches()['newbranch']).toEqual(parser.yy.getBranches()['master']);
+        expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()['master']);
 
         parser.yy.prettyPrint();
     });
diff --git a/src/diagrams/gitGraph/gitGraphRenderer.js b/src/diagrams/gitGraph/gitGraphRenderer.js
index 6ba867cb9..b32c9ef46 100644
--- a/src/diagrams/gitGraph/gitGraphRenderer.js
+++ b/src/diagrams/gitGraph/gitGraphRenderer.js
@@ -11,7 +11,7 @@ var config = {
     nodeWidth: 75,
     lineStrokeWidth: 4,
     branchLineHeight: 50,
-    lineColor: "grey",
+    lineColor: 'grey',
     leftMargin: 50,
     nodeLabel: {
         width: 50,
@@ -28,28 +28,28 @@ exports.setConf = function(c) {
 
 function svgCreateDefs(svg) {
     svg
-        .append("defs")
-        .append("g")
-        .attr("id", "def-commit")
-        .append("circle")
-        .attr("r", 15)
-        .attr("cx", 0)
-        .attr("cy", 0);
-    svg.select("#def-commit")
+        .append('defs')
+        .append('g')
+        .attr('id', 'def-commit')
+        .append('circle')
+        .attr('r', 15)
+        .attr('cx', 0)
+        .attr('cy', 0);
+    svg.select('#def-commit')
         .append('foreignObject')
         .attr('width', config.nodeLabel.width)
         .attr('height', config.nodeLabel.height)
         .attr('x', config.nodeLabel.x)
         .attr('y', config.nodeLabel.y)
-        .attr('class', "node-label")
+        .attr('class', 'node-label')
         .attr('requiredFeatures', 'http://www.w3.org/TR/SVG11/feature#Extensibility')
         .append('xhtml:p')
-        .html("a big chunk of text that should wrap");
+        .html('a big chunk of text that should wrap');
 }
 
 
 function svgDrawLine(svg, points, interpolate) {
-    interpolate = interpolate || "basis";
+    interpolate = interpolate || 'basis';
     var lineGen = d3.svg.line()
         .x(function(d) {
             return Math.round(d.x)
@@ -60,11 +60,11 @@ function svgDrawLine(svg, points, interpolate) {
         .interpolate(interpolate);
 
     svg
-        .append("svg:path")
-        .attr("d", lineGen(points))
-        .style("stroke", config.lineColor)
-        .style("stroke-width", config.lineStrokeWidth)
-        .style("fill", "none");
+        .append('svg:path')
+        .attr('d', lineGen(points))
+        .style('stroke', config.lineColor)
+        .style('stroke-width', config.lineStrokeWidth)
+        .style('fill', 'none');
 }
 // Pass in the element and its pre-transform coords
 function getElementCoords(element, coords) {
@@ -79,17 +79,17 @@ function getElementCoords(element, coords) {
         width: coords.width,
         height: coords.height
     };
-};
+}
 
 function svgDrawLineForCommits(svg, fromId, toId) {
-    log.debug("svgDrawLineForCommits: ", fromId, toId);
-    var fromBbox = getElementCoords(svg.select("#node-" + fromId + " circle"));
-    var toBbox = getElementCoords(svg.select("#node-" + toId + " circle"));
-    //log.debug("svgDrawLineForCommits: ", fromBbox, toBbox);
+    log.debug('svgDrawLineForCommits: ', fromId, toId);
+    var fromBbox = getElementCoords(svg.select('#node-' + fromId + ' circle'));
+    var toBbox = getElementCoords(svg.select('#node-' + toId + ' circle'));
+    //log.debug('svgDrawLineForCommits: ', fromBbox, toBbox);
     if (fromBbox.left - toBbox.left > config.nodeWidth) {
         var lineStart = { x: fromBbox.left - config.nodeWidth, y: toBbox.top  + toBbox.height/2};
         var lineEnd ={ x: toBbox.left + toBbox.width, y: toBbox.top + toBbox.height/2 };
-        svgDrawLine(svg, [lineStart , lineEnd], "linear")
+        svgDrawLine(svg, [lineStart , lineEnd], 'linear')
         svgDrawLine(svg, [
         {x: fromBbox.left, y: fromBbox.top + fromBbox.height/2},
         {x: fromBbox.left - config.nodeWidth/2, y: fromBbox.top + fromBbox.height/2},
@@ -97,17 +97,17 @@ function svgDrawLineForCommits(svg, fromId, toId) {
         lineStart]);
     } else {
         svgDrawLine(svg, [{
-            "x": fromBbox.left,
-            "y": fromBbox.top + fromBbox.height / 2
+            'x': fromBbox.left,
+            'y': fromBbox.top + fromBbox.height / 2
         }, {
-            "x": fromBbox.left - config.nodeWidth/2,
-            "y": fromBbox.top + fromBbox.height / 2
+            'x': fromBbox.left - config.nodeWidth/2,
+            'y': fromBbox.top + fromBbox.height / 2
         }, {
-            "x": fromBbox.left - config.nodeWidth/2,
-            "y": toBbox.top + toBbox.height / 2
+            'x': fromBbox.left - config.nodeWidth/2,
+            'y': toBbox.top + toBbox.height / 2
         }, {
-            "x": toBbox.left + toBbox.width,
-            "y": toBbox.top + toBbox.height / 2
+            'x': toBbox.left + toBbox.width,
+            'y': toBbox.top + toBbox.height / 2
         }]);
     }
 }
@@ -121,36 +121,36 @@ function renderCommitHistory(svg, commitid, branches, direction) {
     if (_.isString(commitid)) {
         do {
             commit = allCommitsDict[commitid];
-            log.debug("in renderCommitHistory", commit.id, commit.seq);
-            if (svg.select("#node-" + commitid).size() > 0)  {
+            log.debug('in renderCommitHistory', commit.id, commit.seq);
+            if (svg.select('#node-' + commitid).size() > 0)  {
             return;
             }
             svg
                 .append(function() {
-                    return cloneNode(svg, "#def-commit");
+                    return cloneNode(svg, '#def-commit');
                 })
-                .attr("class", "commit")
-                .attr("id", function() {
-                    return "node-" + commit.id;
+                .attr('class', 'commit')
+                .attr('id', function() {
+                    return 'node-' + commit.id;
                 })
-                .attr("transform", function() {
-                    return "translate(" + (commit.seq * config.nodeWidth + config.leftMargin) + ", "
-                                + (branchNum * config.branchLineHeight) + ")";
+                .attr('transform', function() {
+                    return 'translate(' + (commit.seq * config.nodeWidth + config.leftMargin) + ', '
+                                + (branchNum * config.branchLineHeight) + ')';
                 })
-                .attr("fill", "yellow")
-                .attr("stroke", "grey")
-                .attr("stroke-width", "2");
+                .attr('fill', 'yellow')
+                .attr('stroke', 'grey')
+                .attr('stroke-width', '2');
 
-            svg.select("#node-" + commit.id + " p")
+            svg.select('#node-' + commit.id + ' p')
                 .text(commit.id);
-            var branch = _.find(branches, ["commit", commit]);
+            var branch = _.find(branches, ['commit', commit]);
             if (branch) {
-                log.debug("found branch ", branch.name);
+                log.debug('found branch ', branch.name);
                 // don't try to select foreignObject - doesn't work.
                 // instead select by class name and it works.
-                svg.select("#node-" + commit.id + " .node-label")
-                    .append("xhtml:p")
-                    .attr("class", "branch-label")
+                svg.select('#node-' + commit.id + ' .node-label')
+                    .append('xhtml:p')
+                    .attr('class', 'branch-label')
                     .text(branch.name);
             }
             commitid = commit.parent
@@ -158,7 +158,7 @@ function renderCommitHistory(svg, commitid, branches, direction) {
     }
 
     if (_.isArray(commitid)) {
-        log.debug("found merge commmit", commitid);
+        log.debug('found merge commmit', commitid);
         renderCommitHistory(svg, commitid[0], branches, direction);
         branchNum++;
         renderCommitHistory(svg, commitid[1], branches, direction);
@@ -187,17 +187,17 @@ exports.draw = function(txt, id, ver) {
 
         log.debug('in gitgraph renderer', txt, id, ver);
         // Parse the graph definition
-        parser.parse(txt + "\n");
+        parser.parse(txt + '\n');
 
         config = _.extend(config, apiConfig, db.getOptions());
-        log.debug("effective options", config);
+        log.debug('effective options', config);
         var direction = db.getDirection();
         allCommitsDict = db.getCommits();
         var branches = db.getBranchesAsObjArray();
         var svg = d3.select('#' + id);
         svgCreateDefs(svg);
         branchNum = 1;
-        _.each(branches, function(v, k) {
+        _.each(branches, function(v) {
             renderCommitHistory(svg, v.commit.id, branches, direction);
             renderLines(svg, v.commit);
             branchNum++;
@@ -206,7 +206,7 @@ exports.draw = function(txt, id, ver) {
         svg.attr('height', 900);
         svg.attr('width', 2500);
     } catch (e) {
-        log.error("Error while rendering gitgraph");
+        log.error('Error while rendering gitgraph');
         log.error(e.message);
     }
 };