Allow linking to file lines

Supported formats: "L12" for single lines and "L12-34" for multiple lines

app/assets/javascripts/tree.js.coffee

@@ -35,3 +35,22 @@ $ ->
         state = History.getState()
         window.ajaxGet(state.url)
     )(window)
+
+  # See if there are lines selected
+  # "#L12" and "#L34-56" supported
+  highlightBlobLines = ->
+    if window.location.hash isnt ""
+      matches = window.location.hash.match /\#L(\d+)(\-(\d+))?/
+      first_line = parseInt matches[1]
+      last_line = parseInt matches[3]
+
+      unless isNaN first_line
+        last_line = first_line if isNaN last_line
+        $("#tree-content-holder .highlight .line").removeClass("hll")
+        $("#LC#{line}").addClass("hll") for line in [first_line..last_line]
+        $("#L#{first_line}").ScrollTo()
+
+  # Highlight the correct lines on load
+  highlightBlobLines()
+  # Highlight the correct lines when the hash part of the URL changes
+  $(window).on 'hashchange', highlightBlobLines