diff --git a/app/assets/javascripts/branch-graph.js b/app/assets/javascripts/branch-graph.js
deleted file mode 100644
index 525b1795..00000000
--- a/app/assets/javascripts/branch-graph.js
+++ /dev/null
@@ -1,398 +0,0 @@
-!function(){
-
-  var BranchGraph = function(element, options){
-    this.element = element;
-    this.options = options;
-    
-    this.preparedCommits = {};
-    this.mtime = 0;
-    this.mspace = 0;
-    this.parents = {};
-    this.colors = ["#000"];
-    
-    this.load();
-  };
-  
-  BranchGraph.prototype.load = function(){
-    $.ajax({
-      url: this.options.url,
-      method: 'get',
-      dataType: 'json',
-      success: $.proxy(function(data){
-        $('.loading', this.element).hide();
-        this.prepareData(data.days, data.commits);
-        this.buildGraph();
-      }, this)
-    });
-  };
-  
-  BranchGraph.prototype.prepareData = function(days, commits){
-    this.days = days;
-    this.dayCount = days.length;
-    this.commits = commits;
-    this.commitCount = commits.length;
-    
-    this.collectParents();
-    
-    this.mtime += 4;
-    this.mspace += 10;
-    for (var i = 0; i < this.commitCount; i++) {
-      if (this.commits[i].id in this.parents) {
-        this.commits[i].isParent = true;
-      }
-      this.preparedCommits[this.commits[i].id] = this.commits[i];
-    }
-    this.collectColors();
-  };
-  
-  BranchGraph.prototype.collectParents = function(){
-    for (var i = 0; i < this.commitCount; i++) {
-      for (var j = 0, jj = this.commits[i].parents.length; j < jj; j++) {
-        this.parents[this.commits[i].parents[j][0]] = true;
-      }
-      this.mtime = Math.max(this.mtime, this.commits[i].time);
-      this.mspace = Math.max(this.mspace, this.commits[i].space);
-    }
-  };
-  
-  BranchGraph.prototype.collectColors = function(){
-    for (var k = 0; k < this.mspace; k++) {
-      this.colors.push(Raphael.getColor(.8));
-      // Skipping a few colors in the spectrum to get more contrast between colors
-      Raphael.getColor();Raphael.getColor();
-    }
-  };
-
-  BranchGraph.prototype.buildGraph = function(){
-    var graphWidth = $(this.element).width()
-      , ch = this.mspace * 20 + 100
-      , cw = Math.max(graphWidth, this.mtime * 20 + 260)
-      , r = Raphael(this.element.get(0), cw, ch)
-      , top = r.set()
-      , cuday = 0
-      , cumonth = ""
-      , offsetX = 20
-      , offsetY = 60
-      , barWidth = Math.max(graphWidth, this.dayCount * 20 + 320)
-      , scrollLeft = cw;
-    
-    this.raphael = r;
-    
-    r.rect(0, 0, barWidth, 20).attr({fill: "#222"});
-    r.rect(0, 20, barWidth, 20).attr({fill: "#444"});
-    
-    for (mm = 0; mm < this.dayCount; mm++) {
-      if(this.days[mm] != null){
-        if(cuday != this.days[mm][0]){
-          // Dates
-          r.text(offsetX + mm * 20, 31, this.days[mm][0]).attr({
-            font: "12px Monaco, monospace",
-            fill: "#DDD"
-          });
-          cuday = this.days[mm][0];
-        }
-        if(cumonth != this.days[mm][1]){
-          // Months
-          r.text(offsetX + mm * 20, 11, this.days[mm][1]).attr({
-            font: "12px Monaco, monospace", 
-            fill: "#EEE"
-          });
-          cumonth = this.days[mm][1];
-        }
-      }
-    }
-    
-    for (i = 0; i < this.commitCount; i++) {
-      var x = offsetX + 20 * this.commits[i].time
-        , y = offsetY + 10 * this.commits[i].space
-        , c
-        , ps;
-      
-      // Draw dot
-      r.circle(x, y, 3).attr({
-        fill: this.colors[this.commits[i].space], 
-        stroke: "none"
-      });
-      
-      // Draw lines
-      for (var j = 0, jj = this.commits[i].parents.length; j < jj; j++) {
-        c = this.preparedCommits[this.commits[i].parents[j][0]];
-        ps = this.commits[i].parents[j][1];
-        var cx = offsetX + 20 * c.time
-          , cy = offsetY + 10 * c.space
-          , psy = offsetY + 10 * ps;
-        if (c.space == this.commits[i].space && c.space == ps) {
-          r.path([
-            "M", x, y,
-            "L", cx, cy
-          ]).attr({
-            stroke: this.colors[c.space], 
-            "stroke-width": 2
-          });
-
-        } else if (c.space < this.commits[i].space) {
-          if (y == psy) {
-              r.path([
-                  "M", x - 5, y,
-                  "l-5,-2,0,4,5,-2",
-                  "L", x - 10, y,
-                  "L", x - 15, psy,
-                  "L", cx + 5, psy,
-                  "L", cx, cy])
-              .attr({
-                stroke: this.colors[this.commits[i].space], 
-                "stroke-width": 2
-              });
-          } else {
-              r.path([
-                  "M", x - 3, y - 6,
-                  "l-4,-3,4,-2,0,5",
-                  "L", x - 5, y - 10,
-                  "L", x - 10, psy,
-                  "L", cx + 5, psy,
-                  "L", cx, cy])
-              .attr({
-                stroke: this.colors[this.commits[i].space], 
-                "stroke-width": 2
-              });
-          }
-        } else {
-          r.path([
-              "M", x - 3, y + 6,
-              "l-4,3,4,2,0,-5",
-              "L", x - 5, y + 10,
-              "L", x - 10, psy,
-              "L", cx + 5, psy,
-              "L", cx, cy])
-          .attr({
-            stroke: this.colors[c.space], 
-            "stroke-width": 2
-          });
-        }
-      }
-      
-      if (this.commits[i].refs) {
-        this.appendLabel(x, y, this.commits[i].refs);
-      }
-      
-      // mark commit and displayed in the center
-      if (this.commits[i].id == this.options.commit_id) {
-        r.path([
-            'M', x, y - 5,
-            'L', x + 4, y - 15,
-            'L', x - 4, y - 15,
-            'Z'
-            ]).attr({
-              "fill": "#000",
-              "fill-opacity": .7,
-              "stroke": "none"
-              });
-        scrollLeft = x - graphWidth / 2;
-      }
-
-      this.appendAnchor(top, this.commits[i], x, y);
-    }
-    top.toFront();
-    this.element.scrollLeft(scrollLeft);
-    this.bindEvents();
-  };
-  
-  BranchGraph.prototype.bindEvents = function(){
-    var drag = {}
-      , element = this.element;
-      
-    var dragger = function(event){
-      element.scrollLeft(drag.sl - (event.clientX - drag.x));
-      element.scrollTop(drag.st - (event.clientY - drag.y));
-    };
-    
-    element.on({
-      mousedown: function (event) {
-        drag = {
-          x: event.clientX, 
-          y: event.clientY, 
-          st: element.scrollTop(), 
-          sl: element.scrollLeft()
-        };
-        $(window).on('mousemove', dragger);
-      }
-    });
-    $(window).on({
-      mouseup: function(){
-        //bars.animate({opacity: 0}, 300);
-        $(window).off('mousemove', dragger);
-      },
-      keydown: function(event){
-        if(event.keyCode == 37){
-          // left
-          element.scrollLeft( element.scrollLeft() - 50); 
-        }
-        if(event.keyCode == 38){
-          // top
-          element.scrollTop( element.scrollTop() - 50); 
-        }
-        if(event.keyCode == 39){
-          // right
-          element.scrollLeft( element.scrollLeft() + 50); 
-        }
-        if(event.keyCode == 40){
-          // bottom
-          element.scrollTop( element.scrollTop() + 50); 
-        }
-      }
-    });
-  };
-  
-  BranchGraph.prototype.appendLabel = function(x, y, refs){
-    var r = this.raphael
-      , shortrefs = refs
-      , text, textbox, rect;
-    
-    if (shortrefs.length > 17){
-      // Truncate if longer than 15 chars
-      shortrefs = shortrefs.substr(0,15) + "…";
-    }
-    
-    text = r.text(x+5, y+8 + 10, shortrefs).attr({
-      font: "10px Monaco, monospace", 
-      fill: "#FFF",
-      title: refs
-    });
-
-    textbox = text.getBBox();
-    text.transform([
-      't', textbox.height/-4, textbox.width/2 + 5,
-      'r90'
-    ]);
-    
-    // Create rectangle based on the size of the textbox
-    rect = r.rect(x, y, textbox.width + 15, textbox.height + 5, 4).attr({
-      "fill": "#000",
-      "fill-opacity": .7,
-      "stroke": "none"
-    });
-    
-    triangle = r.path([
-      'M', x, y + 5,
-      'L', x + 4, y + 15,
-      'L', x - 4, y + 15,
-      'Z'
-    ]).attr({
-      "fill": "#000",
-      "fill-opacity": .7,
-      "stroke": "none"
-    });
-    
-    // Rotate and reposition rectangle over text
-    rect.transform([
-      'r', 90, x, y,
-      't', 15, -9
-    ]);
-    
-    // Set text to front
-    text.toFront();
-  };
-  
-  BranchGraph.prototype.appendAnchor = function(top, commit, x, y) {
-    var r = this.raphael
-      , options = this.options
-      , anchor;
-    anchor = r.circle(x, y, 10).attr({
-      fill: "#000", 
-      opacity: 0, 
-      cursor: "pointer"
-    })
-    .click(function(){
-      window.open(options.commit_url.replace('%s', commit.id), '_blank');
-    })
-    .hover(function(){
-      this.tooltip = r.commitTooltip(x, y + 5, commit);
-      top.push(this.tooltip.insertBefore(this));
-    }, function(){
-      this.tooltip && this.tooltip.remove() && delete this.tooltip;
-    });
-    top.push(anchor);
-  };
-  
-  this.BranchGraph = BranchGraph;
-  
-}(this);
-Raphael.fn.commitTooltip = function(x, y, commit){
-  var icon, nameText, idText, messageText
-    , boxWidth = 300
-    , boxHeight = 200;
-  
-  icon = this.image(commit.author.icon, x, y, 20, 20);
-  nameText = this.text(x + 25, y + 10, commit.author.name);
-  idText = this.text(x, y + 35, commit.id);
-  messageText = this.text(x, y + 50, commit.message);
-  
-  textSet = this.set(icon, nameText, idText, messageText).attr({
-    "text-anchor": "start",
-    "font": "12px Monaco, monospace"
-  });
-  
-  nameText.attr({
-    "font": "14px Arial",
-    "font-weight": "bold"
-  });
-  
-  idText.attr({
-    "fill": "#AAA"
-  });
-  
-  textWrap(messageText, boxWidth - 50);
-
-  var rect = this.rect(x - 10, y - 10, boxWidth, 100, 4).attr({
-    "fill": "#FFF",
-    "stroke": "#000",
-    "stroke-linecap": "round",
-    "stroke-width": 2
-  });
-  var tooltip = this.set(rect, textSet);
-
-  rect.attr({
-    "height" : tooltip.getBBox().height + 10,
-    "width" : tooltip.getBBox().width + 10
-  });
-  
-  tooltip.transform([
-    't', 20, 20
-  ]);
-  
-  return tooltip;
-};
-
-function textWrap(t, width) {
-  var content = t.attr("text");
-  var abc = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
-  t.attr({
-    "text" : abc
-  });
-  var letterWidth = t.getBBox().width / abc.length;
-  
-  t.attr({
-    "text" : content
-  });
-
-  var words = content.split(" ");
-  var x = 0, s = [];
-  for ( var i = 0; i < words.length; i++) {
-
-    var l = words[i].length;
-    if (x + (l * letterWidth) > width) {
-        s.push("\n");
-        x = 0;
-    }
-    x += l * letterWidth;
-    s.push(words[i] + " ");
-  }
-  t.attr({
-    "text" : s.join("")
-  });
-  var b = t.getBBox()
-    , h = Math.abs(b.y2) - Math.abs(b.y) + 1;
-  t.attr({
-    "y": b.y + h
-  });
-}
diff --git a/app/assets/javascripts/branch-graph.js.coffee b/app/assets/javascripts/branch-graph.js.coffee
new file mode 100644
index 00000000..6e4d6931
--- /dev/null
+++ b/app/assets/javascripts/branch-graph.js.coffee
@@ -0,0 +1,273 @@
+class BranchGraph
+  constructor: (@element, @options) ->
+    @preparedCommits = {}
+    @mtime = 0
+    @mspace = 0
+    @parents = {}
+    @colors = ["#000"]
+    @load()
+
+  load: ->
+    $.ajax
+      url: @options.url
+      method: "get"
+      dataType: "json"
+      success: $.proxy((data) ->
+        $(".loading", @element).hide()
+        @prepareData data.days, data.commits
+        @buildGraph()
+      , this)
+
+  prepareData: (@days, @commits) ->
+    @collectParents()
+    @mtime += 4
+    @mspace += 10
+
+    for c in @commits
+      c.isParent = true  if c.id of @parents
+      @preparedCommits[c.id] = c
+
+    @collectColors()
+
+  collectParents: ->
+    for c in @commits
+      @mtime = Math.max(@mtime, c.time)
+      @mspace = Math.max(@mspace, c.space)
+      for p in c.parents
+        @parents[p[0]] = true
+
+  collectColors: ->
+    k = 0
+    while k < @mspace
+      @colors.push Raphael.getColor(.8)
+      # Skipping a few colors in the spectrum to get more contrast between colors
+      Raphael.getColor()
+      Raphael.getColor()
+      k++
+
+  buildGraph: ->
+    graphWidth = $(@element).width()
+    ch = @mspace * 20 + 100
+    cw = Math.max(graphWidth, @mtime * 20 + 260)
+    r = Raphael(@element.get(0), cw, ch)
+    top = r.set()
+    cuday = 0
+    cumonth = ""
+    offsetX = 20
+    offsetY = 60
+    barWidth = Math.max(graphWidth, @days.length * 20 + 320)
+    scrollLeft = cw
+    @raphael = r
+    r.rect(0, 0, barWidth, 20).attr fill: "#222"
+    r.rect(0, 20, barWidth, 20).attr fill: "#444"
+
+    for day, mm in @days
+      if cuday isnt day[0]
+        # Dates
+        r.text(offsetX + mm * 20, 31, day[0])
+          .attr(
+            font: "12px Monaco, monospace"
+            fill: "#DDD"
+          )
+        cuday = day[0]
+
+      if cumonth isnt day[1]
+        # Months
+        r.text(offsetX + mm * 20, 11, day[1])
+          .attr(
+            font: "12px Monaco, monospace"
+            fill: "#EEE"
+          )
+        cumonth = day[1]
+
+    for commit in @commits
+      x = offsetX + 20 * commit.time
+      y = offsetY + 10 * commit.space
+      # Draw dot
+      r.circle(x, y, 3).attr(
+        fill: @colors[commit.space]
+        stroke: "none"
+      )
+
+      # Draw lines
+      for parent in commit.parents
+        parentCommit = @preparedCommits[parent[0]]
+        parentX = offsetX + 20 * parentCommit.time
+        parentY1 = offsetY + 10 * parentCommit.space
+        parentY2 = offsetY + 10 * parent[1]
+        if parentCommit.space is commit.space and parentCommit.space is parent[1]
+          r.path(["M", x, y, "L", parentX, parentY1]).attr(
+            stroke: @colors[parentCommit.space]
+            "stroke-width": 2
+          )
+
+        else if parentCommit.space < commit.space
+          if y is parentY2
+            r.path(["M", x - 5, y, "l-5,-2,0,4,5,-2", "L", x - 10, y, "L", x - 15, parentY2, "L", parentX + 5, parentY2, "L", parentX, parentY1]).attr(
+              stroke: @colors[commit.space]
+              "stroke-width": 2
+            )
+
+          else
+            r.path(["M", x - 3, y - 6, "l-4,-3,4,-2,0,5", "L", x - 5, y - 10, "L", x - 10, parentY2, "L", parentX + 5, parentY2, "L", parentX, parentY1]).attr(
+              stroke: @colors[commit.space]
+              "stroke-width": 2
+            )
+
+        else
+          r.path(["M", x - 3, y + 6, "l-4,3,4,2,0,-5", "L", x - 5, y + 10, "L", x - 10, parentY2, "L", parentX + 5, parentY2, "L", parentX, parentY1]).attr(
+            stroke: @colors[parentCommit.space]
+            "stroke-width": 2
+          )
+
+      @appendLabel x, y, commit.refs  if commit.refs
+
+      # Mark commit and displayed in the center
+      if commit.id is @options.commit_id
+        r.path(["M", x, y - 5, "L", x + 4, y - 15, "L", x - 4, y - 15, "Z"]).attr(
+          fill: "#000"
+          "fill-opacity": .7
+          stroke: "none"
+        )
+
+        scrollLeft = x - graphWidth / 2
+
+      @appendAnchor top, commit, x, y
+
+    top.toFront()
+    @element.scrollLeft scrollLeft
+    @bindEvents()
+
+  bindEvents: ->
+    drag = {}
+    element = @element
+    dragger = (event) ->
+      element.scrollLeft drag.sl - (event.clientX - drag.x)
+      element.scrollTop drag.st - (event.clientY - drag.y)
+
+    element.on mousedown: (event) ->
+      drag =
+        x: event.clientX
+        y: event.clientY
+        st: element.scrollTop()
+        sl: element.scrollLeft()
+      $(window).on "mousemove", dragger
+
+    $(window).on
+      mouseup: ->
+        $(window).off "mousemove", dragger
+      keydown: (event) ->
+        # left
+        element.scrollLeft element.scrollLeft() - 50  if event.keyCode is 37
+        # top
+        element.scrollTop element.scrollTop() - 50  if event.keyCode is 38
+        # right
+        element.scrollLeft element.scrollLeft() + 50  if event.keyCode is 39
+        # bottom
+        element.scrollTop element.scrollTop() + 50  if event.keyCode is 40
+
+  appendLabel: (x, y, refs) ->
+    r = @raphael
+    shortrefs = refs
+    # Truncate if longer than 15 chars
+    shortrefs = shortrefs.substr(0, 15) + "…"  if shortrefs.length > 17
+    text = r.text(x + 5, y + 8 + 10, shortrefs).attr(
+      font: "10px Monaco, monospace"
+      fill: "#FFF"
+      title: refs
+    )
+    textbox = text.getBBox()
+    text.transform ["t", textbox.height / -4, textbox.width / 2 + 5, "r90"]
+    # Create rectangle based on the size of the textbox
+    rect = r.rect(x, y, textbox.width + 15, textbox.height + 5, 4).attr(
+      fill: "#000"
+      "fill-opacity": .7
+      stroke: "none"
+    )
+    triangle = r.path(["M", x, y + 5, "L", x + 4, y + 15, "L", x - 4, y + 15, "Z"]).attr(
+      fill: "#000"
+      "fill-opacity": .7
+      stroke: "none"
+    )
+    # Rotate and reposition rectangle over text
+    rect.transform ["r", 90, x, y, "t", 15, -9]
+    # Set text to front
+    text.toFront()
+
+  appendAnchor: (top, commit, x, y) ->
+    r = @raphael
+    options = @options
+    anchor = r.circle(x, y, 10).attr(
+      fill: "#000"
+      opacity: 0
+      cursor: "pointer"
+    ).click(->
+      window.open options.commit_url.replace("%s", commit.id), "_blank"
+    ).hover(->
+      @tooltip = r.commitTooltip(x, y + 5, commit)
+      top.push @tooltip.insertBefore(this)
+    , ->
+      @tooltip and @tooltip.remove() and delete @tooltip
+    )
+    top.push anchor
+
+Raphael::commitTooltip = (x, y, commit) ->
+  icon = undefined
+  nameText = undefined
+  idText = undefined
+  messageText = undefined
+  boxWidth = 300
+  boxHeight = 200
+  icon = @image(commit.author.icon, x, y, 20, 20)
+  nameText = @text(x + 25, y + 10, commit.author.name)
+  idText = @text(x, y + 35, commit.id)
+  messageText = @text(x, y + 50, commit.message)
+  textSet = @set(icon, nameText, idText, messageText).attr(
+    "text-anchor": "start"
+    font: "12px Monaco, monospace"
+  )
+  nameText.attr(
+    font: "14px Arial"
+    "font-weight": "bold"
+  )
+
+  idText.attr fill: "#AAA"
+  @textWrap messageText, boxWidth - 50
+  rect = @rect(x - 10, y - 10, boxWidth, 100, 4).attr(
+    fill: "#FFF"
+    stroke: "#000"
+    "stroke-linecap": "round"
+    "stroke-width": 2
+  )
+  tooltip = @set(rect, textSet)
+  rect.attr(
+    height: tooltip.getBBox().height + 10
+    width: tooltip.getBBox().width + 10
+  )
+
+  tooltip.transform ["t", 20, 20]
+  tooltip
+
+Raphael::textWrap = (t, width) ->
+  content = t.attr("text")
+  abc = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+  t.attr text: abc
+  letterWidth = t.getBBox().width / abc.length
+  t.attr text: content
+  words = content.split(" ")
+  x = 0
+  s = []
+
+  for word in words
+    if x + (word.length * letterWidth) > width
+      s.push "\n"
+      x = 0
+    x += word.length * letterWidth
+    s.push word + " "
+
+  t.attr text: s.join("")
+  b = t.getBBox()
+  h = Math.abs(b.y2) - Math.abs(b.y) + 1
+  t.attr y: b.y + h
+
+@BranchGraph = BranchGraph