thodg/libgit2

diff --git a/src/diff_driver.c b/src/diff_driver.c
index 9249d14..4c9a0af 100644
--- a/src/diff_driver.c
+++ b/src/diff_driver.c
@@ -437,6 +437,7 @@ static int diff_context_line__pattern_match(
 			i = (pmatch[1].rm_so >= 0) ? 1 : 0;
 			git_buf_consume(line, git_buf_cstr(line) + pmatch[i].rm_so);
 			git_buf_truncate(line, pmatch[i].rm_eo - pmatch[i].rm_so);
+			git_buf_rtrim(line);
 
 			return true;
 		}
diff --git a/src/userdiff.h b/src/userdiff.h
index 93b4d0d..2257035 100644
--- a/src/userdiff.h
+++ b/src/userdiff.h
@@ -193,9 +193,9 @@ PATTERNS("php",
 	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 
 PATTERNS("javascript",
-	 "^[ \t]*(\(?function[ \t].*)$\n"
-	 "^[ \t]*(var[ \t]+[a-zA-Z_][a-zA-Z0-9_]*[ \t]*=[ \t]*function[ \t\(].*)$\n"
-	 "^[ \t]*([a-zA-Z_][a-zA-Z0-9_]*[ \t]*:[ \t]*function[ \t\(].*)$",
+	 "^[ \t]*(function[ \t][a-zA-Z_][^\{]*)\n"
+	 "^[ \t]*(var[ \t]+[a-zA-Z_][a-zA-Z0-9_]*[ \t]*=[ \t]*function[ \t\(][^\{]*)\n"
+	 "^[ \t]*([a-zA-Z_][a-zA-Z0-9_]*[ \t]*:[ \t]*function[ \t\(][^\{]*)",
 	 /* -- */
 	 "[a-zA-Z_][a-zA-Z0-9_]*"
 	 "|[-+0-9.e]+[fFlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
diff --git a/tests/diff/drivers.c b/tests/diff/drivers.c
index 1cbf9e2..8b12368 100644
--- a/tests/diff/drivers.c
+++ b/tests/diff/drivers.c
@@ -180,22 +180,23 @@ void test_diff_drivers__builtins(void)
 	git_patch *patch;
 	git_buf file = GIT_BUF_INIT, actual = GIT_BUF_INIT, expected = GIT_BUF_INIT;
 	git_diff_options opts = GIT_DIFF_OPTIONS_INIT;
-	int i;
-	static const char *files[] = {
-		"html",
-		NULL
-	};
+	git_vector files = GIT_VECTOR_INIT;
+	size_t i;
+	char *path, *extension;
 
 	g_repo = cl_git_sandbox_init("userdiff");
 
+	cl_git_pass(git_path_dirload("userdiff/files", 9, 0, 0, &files));
+
 	opts.interhunk_lines = 1;
 	opts.context_lines = 1;
 	opts.pathspec.count = 1;
 
-	for (i = 0; files[i]; ++i) {
-		git_buf_sets(&file, "files/file.");
-		git_buf_puts(&file, files[i]);
-		opts.pathspec.strings = &file.ptr;
+	git_vector_foreach(&files, i, path) {
+		if (git__prefixcmp(path, "files/file."))
+			continue;
+		extension = path + strlen("files/file.");
+		opts.pathspec.strings = &path;
 
 		/* do diff with no special driver */
 
@@ -205,7 +206,7 @@ void test_diff_drivers__builtins(void)
 		cl_git_pass(git_patch_to_buf(&actual, patch));
 
 		git_buf_sets(&expected, "userdiff/expected/nodriver/diff.");
-		git_buf_puts(&expected, files[i]);
+		git_buf_puts(&expected, extension);
 		cl_git_pass(git_futils_readbuffer(&expected, expected.ptr));
 
 		overwrite_filemode(expected.ptr, &actual);
@@ -220,7 +221,7 @@ void test_diff_drivers__builtins(void)
 
 		{
 			FILE *fp = fopen("userdiff/.gitattributes", "w");
-			fprintf(fp, "*.%s diff=%s\n", files[i], files[i]);
+			fprintf(fp, "*.%s diff=%s\n", extension, extension);
 			fclose(fp);
 		}
 
@@ -230,7 +231,7 @@ void test_diff_drivers__builtins(void)
 		cl_git_pass(git_patch_to_buf(&actual, patch));
 
 		git_buf_sets(&expected, "userdiff/expected/driver/diff.");
-		git_buf_puts(&expected, files[i]);
+		git_buf_puts(&expected, extension);
 		cl_git_pass(git_futils_readbuffer(&expected, expected.ptr));
 
 		overwrite_filemode(expected.ptr, &actual);
@@ -240,9 +241,12 @@ void test_diff_drivers__builtins(void)
 		git_buf_clear(&actual);
 		git_patch_free(patch);
 		git_diff_free(diff);
+
+		git__free(path);
 	}
 
 	git_buf_free(&file);
 	git_buf_free(&actual);
 	git_buf_free(&expected);
+	git_vector_free(&files);
 }
diff --git a/tests/resources/userdiff/.gitted/index b/tests/resources/userdiff/.gitted/index
index 9372411..df041cf 100644
Binary files a/tests/resources/userdiff/.gitted/index and b/tests/resources/userdiff/.gitted/index differ
diff --git a/tests/resources/userdiff/.gitted/info/refs b/tests/resources/userdiff/.gitted/info/refs
new file mode 100644
index 0000000..261695f
--- /dev/null
+++ b/tests/resources/userdiff/.gitted/info/refs
@@ -0,0 +1 @@
+802734c801bffc466d69876bc4814f747aaac4fe	refs/heads/master
diff --git a/tests/resources/userdiff/.gitted/objects/05/d669073b39d36847315e3a5b4512cf4cba4546 b/tests/resources/userdiff/.gitted/objects/05/d669073b39d36847315e3a5b4512cf4cba4546
deleted file mode 100644
index 3a9d75c..0000000
Binary files a/tests/resources/userdiff/.gitted/objects/05/d669073b39d36847315e3a5b4512cf4cba4546 and /dev/null differ
diff --git a/tests/resources/userdiff/.gitted/objects/20/ab776b6ff3169fa0e5eff65df30d45187d22ba b/tests/resources/userdiff/.gitted/objects/20/ab776b6ff3169fa0e5eff65df30d45187d22ba
deleted file mode 100644
index 3d57061..0000000
Binary files a/tests/resources/userdiff/.gitted/objects/20/ab776b6ff3169fa0e5eff65df30d45187d22ba and /dev/null differ
diff --git a/tests/resources/userdiff/.gitted/objects/23/20e2f1e4d9e6201a8e15949a0c10a533fa51cd b/tests/resources/userdiff/.gitted/objects/23/20e2f1e4d9e6201a8e15949a0c10a533fa51cd
deleted file mode 100644
index 6dbcafe..0000000
Binary files a/tests/resources/userdiff/.gitted/objects/23/20e2f1e4d9e6201a8e15949a0c10a533fa51cd and /dev/null differ
diff --git a/tests/resources/userdiff/.gitted/objects/2e/a4b8a16d737c180dfdd2b119dec9501592326c b/tests/resources/userdiff/.gitted/objects/2e/a4b8a16d737c180dfdd2b119dec9501592326c
deleted file mode 100644
index e7d2fba..0000000
Binary files a/tests/resources/userdiff/.gitted/objects/2e/a4b8a16d737c180dfdd2b119dec9501592326c and /dev/null differ
diff --git a/tests/resources/userdiff/.gitted/objects/49/c0ff897b2b07a2ea0ed073e62a9dcd02704ba0 b/tests/resources/userdiff/.gitted/objects/49/c0ff897b2b07a2ea0ed073e62a9dcd02704ba0
deleted file mode 100644
index 49d59c1..0000000
Binary files a/tests/resources/userdiff/.gitted/objects/49/c0ff897b2b07a2ea0ed073e62a9dcd02704ba0 and /dev/null differ
diff --git a/tests/resources/userdiff/.gitted/objects/50/346bde7428a29c9845470a14d87b1634293d48 b/tests/resources/userdiff/.gitted/objects/50/346bde7428a29c9845470a14d87b1634293d48
deleted file mode 100644
index 9de1b35..0000000
--- a/tests/resources/userdiff/.gitted/objects/50/346bde7428a29c9845470a14d87b1634293d48
+++ /dev/null
@@ -1 +0,0 @@
-x
+)JMU06g040031QH��I��(��ahוL�7r��Y��MJ��;��
8��
\ No newline at end of file
diff --git a/tests/resources/userdiff/.gitted/objects/5a/428e7dcffb41b65984517f1e6b8547babc8dff b/tests/resources/userdiff/.gitted/objects/5a/428e7dcffb41b65984517f1e6b8547babc8dff
deleted file mode 100644
index 143a1ce..0000000
Binary files a/tests/resources/userdiff/.gitted/objects/5a/428e7dcffb41b65984517f1e6b8547babc8dff and /dev/null differ
diff --git a/tests/resources/userdiff/.gitted/objects/87/2d19663f32459389597b52beec6457c1dc971f b/tests/resources/userdiff/.gitted/objects/87/2d19663f32459389597b52beec6457c1dc971f
deleted file mode 100644
index 415f40a..0000000
Binary files a/tests/resources/userdiff/.gitted/objects/87/2d19663f32459389597b52beec6457c1dc971f and /dev/null differ
diff --git a/tests/resources/userdiff/.gitted/objects/9d/b1d09ff9ad5190bcf12d72ea3c818ffca344c5 b/tests/resources/userdiff/.gitted/objects/9d/b1d09ff9ad5190bcf12d72ea3c818ffca344c5
deleted file mode 100644
index c0a03a2..0000000
--- a/tests/resources/userdiff/.gitted/objects/9d/b1d09ff9ad5190bcf12d72ea3c818ffca344c5
+++ /dev/null
@@ -1,2 +0,0 @@
-x
��M� F]s���fJ+���έ7�g�$P:�_O���{���0��,�c���N:�V�E
-�gRҚ�J���(l�6x�㠜�I9R�[s�O⭻����lP��f�3��b����)^{�d3����9
\ No newline at end of file
diff --git a/tests/resources/userdiff/.gitted/objects/d6/3c806de4f666369ed169495657bec24b558165 b/tests/resources/userdiff/.gitted/objects/d6/3c806de4f666369ed169495657bec24b558165
deleted file mode 100644
index 2c0fbcc..0000000
Binary files a/tests/resources/userdiff/.gitted/objects/d6/3c806de4f666369ed169495657bec24b558165 and /dev/null differ
diff --git a/tests/resources/userdiff/.gitted/objects/ef/1641511d6cb425c6b4f59ef1feffe7762e86e0 b/tests/resources/userdiff/.gitted/objects/ef/1641511d6cb425c6b4f59ef1feffe7762e86e0
deleted file mode 100644
index 223f3b3..0000000
--- a/tests/resources/userdiff/.gitted/objects/ef/1641511d6cb425c6b4f59ef1feffe7762e86e0
+++ /dev/null
@@ -1 +0,0 @@
-x
+)JMU06g040031QH�LK��(��a�r�=��q[dK`�\v���=��
M�r
\ No newline at end of file
diff --git a/tests/resources/userdiff/.gitted/objects/info/packs b/tests/resources/userdiff/.gitted/objects/info/packs
new file mode 100644
index 0000000..6970fd7
--- /dev/null
+++ b/tests/resources/userdiff/.gitted/objects/info/packs
@@ -0,0 +1,2 @@
+P pack-03f78c35e3ca74fffd9d6c2b6dcd60d6ab6a614a.pack
+
diff --git a/tests/resources/userdiff/.gitted/objects/pack/pack-03f78c35e3ca74fffd9d6c2b6dcd60d6ab6a614a.idx b/tests/resources/userdiff/.gitted/objects/pack/pack-03f78c35e3ca74fffd9d6c2b6dcd60d6ab6a614a.idx
new file mode 100644
index 0000000..6d723f5
Binary files /dev/null and b/tests/resources/userdiff/.gitted/objects/pack/pack-03f78c35e3ca74fffd9d6c2b6dcd60d6ab6a614a.idx differ
diff --git a/tests/resources/userdiff/.gitted/objects/pack/pack-03f78c35e3ca74fffd9d6c2b6dcd60d6ab6a614a.pack b/tests/resources/userdiff/.gitted/objects/pack/pack-03f78c35e3ca74fffd9d6c2b6dcd60d6ab6a614a.pack
new file mode 100644
index 0000000..5b263e2
Binary files /dev/null and b/tests/resources/userdiff/.gitted/objects/pack/pack-03f78c35e3ca74fffd9d6c2b6dcd60d6ab6a614a.pack differ
diff --git a/tests/resources/userdiff/.gitted/packed-refs b/tests/resources/userdiff/.gitted/packed-refs
new file mode 100644
index 0000000..6d24ee4
--- /dev/null
+++ b/tests/resources/userdiff/.gitted/packed-refs
@@ -0,0 +1,2 @@
+# pack-refs with: peeled fully-peeled 
+802734c801bffc466d69876bc4814f747aaac4fe refs/heads/master
diff --git a/tests/resources/userdiff/.gitted/refs/heads/master b/tests/resources/userdiff/.gitted/refs/heads/master
deleted file mode 100644
index 2ec79ec..0000000
--- a/tests/resources/userdiff/.gitted/refs/heads/master
+++ /dev/null
@@ -1 +0,0 @@
-9db1d09ff9ad5190bcf12d72ea3c818ffca344c5
diff --git a/tests/resources/userdiff/after/file.javascript b/tests/resources/userdiff/after/file.javascript
new file mode 100644
index 0000000..7cd3c5a
--- /dev/null
+++ b/tests/resources/userdiff/after/file.javascript
@@ -0,0 +1,108 @@
+/*
+  Some code extracted from https://github.com/julianlloyd/scrollReveal.js
+  which happens to be a trending Javascript repo with an MIT license at
+  the time I was working on Javascript userdiff support in libgit2
+
+  I extracted just some of the code, so I suspect this is no longer valid
+  Javascript code, but it contains enough example patterns to work.
+*/
+;(function (window) {
+
+  'use strict';
+
+  var docElem = window.document.documentElement;
+
+  function getViewportH () {
+    var client = docElem['clientHeight'],
+      inner = window['innerHeight'],
+      sample = window['otherProperty'];
+
+    return (client < inner) ? inner : client;
+  }
+
+  function getOffset (el) {
+    var offsetTop = 0,
+        offsetLeft = 0;
+
+    do {
+      if (!isNaN(el.offsetTop)) {
+        offsetTop += el.offsetTop + 1;
+      }
+      if (!isNaN(el.offsetLeft)) {
+        offsetLeft += el.offsetLeft;
+      }
+    } while (el = el.offsetParent)
+
+    return {
+      top: offsetTop,
+      left: offsetLeft
+    }
+  }
+
+  function isElementInViewport (el, h) {
+    var scrolled = window.pageYOffset,
+        viewed = scrolled + getViewportH(),
+        elTop = getOffset(el).top,
+        elBottom = elTop + el.offsetHeight,
+        h = h || 0;
+
+    return (elTop + el.offsetHeight * h) <= viewed && (elBottom) >= scrolled;
+  }
+
+  scrollReveal.prototype = {
+
+    _init: function () {
+
+      var self = this;
+
+      this.elems = Array.prototype.slice.call(docElem.querySelectorAll('[data-scrollReveal]'));
+      this.scrolled = false;
+
+      this.elems.forEach(function (el, i) {
+        self.animate(el);
+      });
+
+      var scrollHandler = function () {
+        if (!self.scrolled) {
+          self.scrolled = true;
+          setTimeout(function () {
+            self._scrollPage();
+          }, 61);
+        }
+      };
+
+      var resizeHandler = function () {
+        function delayed() {
+          self._scrollPage();
+          self.resizeTimeout = null;
+        }
+        if (self.resizeTimeout) {
+          clearTimeout(self.resizeTimeout);
+        }
+        self.resizeTimeout = setTimeout(delayed, 200);
+      };
+
+      window.addEventListener('scroll', scrollHandler, false);
+      window.addEventListener('resize', resizeHandler, false);
+    },
+
+    /*=============================================================================*/
+
+    _scrollPage: function () {
+        var self = this;
+
+        this.elems.forEach(function (el, i) {
+            if (isElementInViewport(el, self.options.viewportFactor)) {
+                self.animate(el);
+            }
+        });
+        this.scrolled = false;
+		this.tested = true;
+    },
+  }; // end scrollReveal.prototype
+
+  document.addEventListener("DOMContentLoaded", function (evt) {
+    window.scrollReveal = new scrollReveal();
+  });
+
+})(window);
diff --git a/tests/resources/userdiff/before/file.javascript b/tests/resources/userdiff/before/file.javascript
new file mode 100644
index 0000000..b9f1286
--- /dev/null
+++ b/tests/resources/userdiff/before/file.javascript
@@ -0,0 +1,109 @@
+/*
+  Some code extracted from https://github.com/julianlloyd/scrollReveal.js
+  which happens to be a trending Javascript repo with an MIT license at
+  the time I was working on Javascript userdiff support in libgit2
+
+  I extracted just some of the code, so I suspect this is no longer valid
+  Javascript code, but it contains enough example patterns to work.
+*/
+;(function (window) {
+
+  'use strict';
+
+  var docElem = window.document.documentElement;
+
+  function getViewportH () {
+    var client = docElem['clientHeight'],
+      inner = window['innerHeight'];
+
+    return (client < inner) ? inner : client;
+  }
+
+  function getOffset (el) {
+    var offsetTop = 0,
+        offsetLeft = 0;
+
+    do {
+      if (!isNaN(el.offsetTop)) {
+        offsetTop += el.offsetTop;
+      }
+      if (!isNaN(el.offsetLeft)) {
+        offsetLeft += el.offsetLeft;
+      }
+    } while (el = el.offsetParent)
+
+    return {
+      top: offsetTop,
+      left: offsetLeft
+    }
+  }
+
+  function isElementInViewport (el, h) {
+    var scrolled = window.pageYOffset,
+        viewed = scrolled + getViewportH(),
+        elH = el.offsetHeight,
+        elTop = getOffset(el).top,
+        elBottom = elTop + elH,
+        h = h || 0;
+
+    return (elTop + elH * h) <= viewed && (elBottom) >= scrolled;
+  }
+
+  scrollReveal.prototype = {
+
+    _init: function () {
+
+      var self = this;
+
+      this.elems = Array.prototype.slice.call(docElem.querySelectorAll('[data-scrollReveal]'));
+      this.scrolled = false;
+
+  //  Initialize all scrollreveals, triggering all
+  //  reveals on visible elements.
+      this.elems.forEach(function (el, i) {
+        self.animate(el);
+      });
+
+      var scrollHandler = function () {
+        if (!self.scrolled) {
+          self.scrolled = true;
+          setTimeout(function () {
+            self._scrollPage();
+          }, 60);
+        }
+      };
+
+      var resizeHandler = function () {
+        function delayed() {
+          self._scrollPage();
+          self.resizeTimeout = null;
+        }
+        if (self.resizeTimeout) {
+          clearTimeout(self.resizeTimeout);
+        }
+        self.resizeTimeout = setTimeout(delayed, 200);
+      };
+
+      window.addEventListener('scroll', scrollHandler, false);
+      window.addEventListener('resize', resizeHandler, false);
+    },
+
+    /*=============================================================================*/
+
+    _scrollPage: function () {
+        var self = this;
+
+        this.elems.forEach(function (el, i) {
+            if (isElementInViewport(el, self.options.viewportFactor)) {
+                self.animate(el);
+            }
+        });
+        this.scrolled = false;
+    },
+  }; // end scrollReveal.prototype
+
+  document.addEventListener("DOMContentLoaded", function (evt) {
+    window.scrollReveal = new scrollReveal();
+  });
+
+})(window);
diff --git a/tests/resources/userdiff/expected/driver/diff.javascript b/tests/resources/userdiff/expected/driver/diff.javascript
new file mode 100644
index 0000000..4e65d07
--- /dev/null
+++ b/tests/resources/userdiff/expected/driver/diff.javascript
@@ -0,0 +1,40 @@
+diff --git a/files/file.javascript b/files/file.javascript
+index b9f1286..7cd3c5a 100644
+--- a/files/file.javascript
++++ b/files/file.javascript
+@@ -16,3 +16,4 @@ function getViewportH ()
+     var client = docElem['clientHeight'],
+-      inner = window['innerHeight'];
++      inner = window['innerHeight'],
++      sample = window['otherProperty'];
+ 
+@@ -27,3 +28,3 @@ function getOffset (el)
+       if (!isNaN(el.offsetTop)) {
+-        offsetTop += el.offsetTop;
++        offsetTop += el.offsetTop + 1;
+       }
+@@ -43,8 +44,7 @@ function isElementInViewport (el, h)
+         viewed = scrolled + getViewportH(),
+-        elH = el.offsetHeight,
+         elTop = getOffset(el).top,
+-        elBottom = elTop + elH,
++        elBottom = elTop + el.offsetHeight,
+         h = h || 0;
+ 
+-    return (elTop + elH * h) <= viewed && (elBottom) >= scrolled;
++    return (elTop + el.offsetHeight * h) <= viewed && (elBottom) >= scrolled;
+   }
+@@ -60,4 +60,2 @@ _init: function ()
+ 
+-  //  Initialize all scrollreveals, triggering all
+-  //  reveals on visible elements.
+       this.elems.forEach(function (el, i) {
+@@ -71,3 +69,3 @@ var scrollHandler = function ()
+             self._scrollPage();
+-          }, 60);
++          }, 61);
+         }
+@@ -101,2 +99,3 @@ _scrollPage: function ()
+         this.scrolled = false;
++		this.tested = true;
+     },
diff --git a/tests/resources/userdiff/expected/nodriver/diff.javascript b/tests/resources/userdiff/expected/nodriver/diff.javascript
new file mode 100644
index 0000000..69afe4f
--- /dev/null
+++ b/tests/resources/userdiff/expected/nodriver/diff.javascript
@@ -0,0 +1,40 @@
+diff --git a/files/file.javascript b/files/file.javascript
+index b9f1286..7cd3c5a 100644
+--- a/files/file.javascript
++++ b/files/file.javascript
+@@ -16,3 +16,4 @@
+     var client = docElem['clientHeight'],
+-      inner = window['innerHeight'];
++      inner = window['innerHeight'],
++      sample = window['otherProperty'];
+ 
+@@ -27,3 +28,3 @@
+       if (!isNaN(el.offsetTop)) {
+-        offsetTop += el.offsetTop;
++        offsetTop += el.offsetTop + 1;
+       }
+@@ -43,8 +44,7 @@
+         viewed = scrolled + getViewportH(),
+-        elH = el.offsetHeight,
+         elTop = getOffset(el).top,
+-        elBottom = elTop + elH,
++        elBottom = elTop + el.offsetHeight,
+         h = h || 0;
+ 
+-    return (elTop + elH * h) <= viewed && (elBottom) >= scrolled;
++    return (elTop + el.offsetHeight * h) <= viewed && (elBottom) >= scrolled;
+   }
+@@ -60,4 +60,2 @@
+ 
+-  //  Initialize all scrollreveals, triggering all
+-  //  reveals on visible elements.
+       this.elems.forEach(function (el, i) {
+@@ -71,3 +69,3 @@
+             self._scrollPage();
+-          }, 60);
++          }, 61);
+         }
+@@ -101,2 +99,3 @@
+         this.scrolled = false;
++		this.tested = true;
+     },
diff --git a/tests/resources/userdiff/files/file.javascript b/tests/resources/userdiff/files/file.javascript
new file mode 100644
index 0000000..7cd3c5a
--- /dev/null
+++ b/tests/resources/userdiff/files/file.javascript
@@ -0,0 +1,108 @@
+/*
+  Some code extracted from https://github.com/julianlloyd/scrollReveal.js
+  which happens to be a trending Javascript repo with an MIT license at
+  the time I was working on Javascript userdiff support in libgit2
+
+  I extracted just some of the code, so I suspect this is no longer valid
+  Javascript code, but it contains enough example patterns to work.
+*/
+;(function (window) {
+
+  'use strict';
+
+  var docElem = window.document.documentElement;
+
+  function getViewportH () {
+    var client = docElem['clientHeight'],
+      inner = window['innerHeight'],
+      sample = window['otherProperty'];
+
+    return (client < inner) ? inner : client;
+  }
+
+  function getOffset (el) {
+    var offsetTop = 0,
+        offsetLeft = 0;
+
+    do {
+      if (!isNaN(el.offsetTop)) {
+        offsetTop += el.offsetTop + 1;
+      }
+      if (!isNaN(el.offsetLeft)) {
+        offsetLeft += el.offsetLeft;
+      }
+    } while (el = el.offsetParent)
+
+    return {
+      top: offsetTop,
+      left: offsetLeft
+    }
+  }
+
+  function isElementInViewport (el, h) {
+    var scrolled = window.pageYOffset,
+        viewed = scrolled + getViewportH(),
+        elTop = getOffset(el).top,
+        elBottom = elTop + el.offsetHeight,
+        h = h || 0;
+
+    return (elTop + el.offsetHeight * h) <= viewed && (elBottom) >= scrolled;
+  }
+
+  scrollReveal.prototype = {
+
+    _init: function () {
+
+      var self = this;
+
+      this.elems = Array.prototype.slice.call(docElem.querySelectorAll('[data-scrollReveal]'));
+      this.scrolled = false;
+
+      this.elems.forEach(function (el, i) {
+        self.animate(el);
+      });
+
+      var scrollHandler = function () {
+        if (!self.scrolled) {
+          self.scrolled = true;
+          setTimeout(function () {
+            self._scrollPage();
+          }, 61);
+        }
+      };
+
+      var resizeHandler = function () {
+        function delayed() {
+          self._scrollPage();
+          self.resizeTimeout = null;
+        }
+        if (self.resizeTimeout) {
+          clearTimeout(self.resizeTimeout);
+        }
+        self.resizeTimeout = setTimeout(delayed, 200);
+      };
+
+      window.addEventListener('scroll', scrollHandler, false);
+      window.addEventListener('resize', resizeHandler, false);
+    },
+
+    /*=============================================================================*/
+
+    _scrollPage: function () {
+        var self = this;
+
+        this.elems.forEach(function (el, i) {
+            if (isElementInViewport(el, self.options.viewportFactor)) {
+                self.animate(el);
+            }
+        });
+        this.scrolled = false;
+		this.tested = true;
+    },
+  }; // end scrollReveal.prototype
+
+  document.addEventListener("DOMContentLoaded", function (evt) {
+    window.scrollReveal = new scrollReveal();
+  });
+
+})(window);