RepoEditor: Implement line and range linking.

2 files changed, 151 insertions, 146 deletions

diff --git a/app/assets/javascripts/line_highlighter.js b/app/assets/javascripts/line_highlighter.js
index 7400c22543f..a16d00b5cef 100644
--- a/app/assets/javascripts/line_highlighter.js
+++ b/app/assets/javascripts/line_highlighter.js
@@ -28,148 +28,149 @@
 //     </div>
 //   </div>
 //
-(function() {
-  this.LineHighlighter = (function() {
-    // CSS class applied to highlighted lines
-    LineHighlighter.prototype.highlightClass = 'hll';
-
-    // Internal copy of location.hash so we're not dependent on `location` in tests
-    LineHighlighter.prototype._hash = '';
-
-    function LineHighlighter(hash) {
-      if (hash == null) {
-        // Initialize a LineHighlighter object
-        //
-        // hash - String URL hash for dependency injection in tests
-        hash = location.hash;
-      }
-      this.setHash = this.setHash.bind(this);
-      this.highlightLine = this.highlightLine.bind(this);
-      this.clickHandler = this.clickHandler.bind(this);
-      this.highlightHash = this.highlightHash.bind(this);
-      this._hash = hash;
-      this.bindEvents();
-      this.highlightHash();
-    }
 
-    LineHighlighter.prototype.bindEvents = function() {
-      const $fileHolder = $('.file-holder');
-      $fileHolder.on('click', 'a[data-line-number]', this.clickHandler);
-      $fileHolder.on('highlight:line', this.highlightHash);
-    };
-
-    LineHighlighter.prototype.highlightHash = function() {
-      var range;
-      if (this._hash !== '') {
-        range = this.hashToRange(this._hash);
-        if (range[0]) {
-          this.highlightRange(range);
-          $.scrollTo("#L" + range[0], {
-            // Scroll to the first highlighted line on initial load
-            // Offset -50 for the sticky top bar, and another -100 for some context
-            offset: -150
-          });
-        }
-      }
-    };
-
-    LineHighlighter.prototype.clickHandler = function(event) {
-      var current, lineNumber, range;
-      event.preventDefault();
-      this.clearHighlight();
-      lineNumber = $(event.target).closest('a').data('line-number');
-      current = this.hashToRange(this._hash);
-      if (!(current[0] && event.shiftKey)) {
-        // If there's no current selection, or there is but Shift wasn't held,
-        // treat this like a single-line selection.
-        this.setHash(lineNumber);
-        return this.highlightLine(lineNumber);
-      } else if (event.shiftKey) {
-        if (lineNumber < current[0]) {
-          range = [lineNumber, current[0]];
-        } else {
-          range = [current[0], lineNumber];
-        }
-        this.setHash(range[0], range[1]);
-        return this.highlightRange(range);
-      }
-    };
-
-    LineHighlighter.prototype.clearHighlight = function() {
-      return $("." + this.highlightClass).removeClass(this.highlightClass);
-    // Unhighlight previously highlighted lines
-    };
-
-    // Convert a URL hash String into line numbers
-    //
-    // hash - Hash String
-    //
-    // Examples:
-    //
-    //   hashToRange('#L5')    # => [5, null]
-    //   hashToRange('#L5-15') # => [5, 15]
-    //   hashToRange('#foo')   # => [null, null]
-    //
-    // Returns an Array
-    LineHighlighter.prototype.hashToRange = function(hash) {
-      var first, last, matches;
-      // ?L(\d+)(?:-(\d+))?$/)
-      matches = hash.match(/^#?L(\d+)(?:-(\d+))?$/);
-      if (matches && matches.length) {
-        first = parseInt(matches[1], 10);
-        last = matches[2] ? parseInt(matches[2], 10) : null;
-        return [first, last];
-      } else {
-        return [null, null];
-      }
-    };
-
-    // Highlight a single line
-    //
-    // lineNumber - Line number to highlight
-    LineHighlighter.prototype.highlightLine = function(lineNumber) {
-      return $("#LC" + lineNumber).addClass(this.highlightClass);
-    };
-
-    // Highlight all lines within a range
-    //
-    // range - Array containing the starting and ending line numbers
-    LineHighlighter.prototype.highlightRange = function(range) {
-      var i, lineNumber, ref, ref1, results;
-      if (range[1]) {
-        results = [];
-        for (lineNumber = i = ref = range[0], ref1 = range[1]; ref <= ref1 ? i <= ref1 : i >= ref1; lineNumber = ref <= ref1 ? (i += 1) : (i -= 1)) {
-          results.push(this.highlightLine(lineNumber));
-        }
-        return results;
-      } else {
-        return this.highlightLine(range[0]);
-      }
-    };
+const LineHighlighter = function(options = {}) {
+  options.highlightLineClass = options.highlightLineClass || 'hll';
+  options.fileHolderSelector = options.fileHolderSelector || '.file-holder';
+  options.scrollFileHolder = options.scrollFileHolder || false;
+  options.hash = options.hash || location.hash;
 
-    // Set the URL hash string
-    LineHighlighter.prototype.setHash = function(firstLineNumber, lastLineNumber) {
-      var hash;
-      if (lastLineNumber) {
-        hash = "#L" + firstLineNumber + "-" + lastLineNumber;
+  this.options = options;
+  this._hash = options.hash;
+  this.highlightLineClass = options.highlightLineClass;
+  this.setHash = this.setHash.bind(this);
+  this.highlightLine = this.highlightLine.bind(this);
+  this.clickHandler = this.clickHandler.bind(this);
+  this.highlightHash = this.highlightHash.bind(this);
+
+  this.bindEvents();
+  this.highlightHash();
+};
+
+LineHighlighter.prototype.bindEvents = function() {
+  const $fileHolder = $(this.options.fileHolderSelector);
+
+  $fileHolder.on('click', 'a[data-line-number]', this.clickHandler);
+  $fileHolder.on('highlight:line', this.highlightHash);
+};
+
+LineHighlighter.prototype.highlightHash = function() {
+  var range;
+
+  if (this._hash !== '') {
+    range = this.hashToRange(this._hash);
+
+    if (range[0]) {
+      this.highlightRange(range);
+      const lineSelector = `#L${range[0]}`;
+      const scrollOptions = {
+        // Scroll to the first highlighted line on initial load
+        // Offset -50 for the sticky top bar, and another -100 for some context
+        offset: -150
+      };
+      if (this.options.scrollFileHolder) {
+        $(this.options.fileHolderSelector).scrollTo(lineSelector, scrollOptions);
       } else {
-        hash = "#L" + firstLineNumber;
+        $.scrollTo(lineSelector, scrollOptions);
       }
-      this._hash = hash;
-      return this.__setLocationHash__(hash);
-    };
-
-    // Make the actual hash change in the browser
-    //
-    // This method is stubbed in tests.
-    LineHighlighter.prototype.__setLocationHash__ = function(value) {
-      return history.pushState({
-        url: value
-      // We're using pushState instead of assigning location.hash directly to
-      // prevent the page from scrolling on the hashchange event
-      }, document.title, value);
-    };
-
-    return LineHighlighter;
-  })();
-}).call(window);
+    }
+  }
+};
+
+LineHighlighter.prototype.clickHandler = function(event) {
+  var current, lineNumber, range;
+  event.preventDefault();
+  this.clearHighlight();
+  lineNumber = $(event.target).closest('a').data('line-number');
+  current = this.hashToRange(this._hash);
+  if (!(current[0] && event.shiftKey)) {
+    // If there's no current selection, or there is but Shift wasn't held,
+    // treat this like a single-line selection.
+    this.setHash(lineNumber);
+    return this.highlightLine(lineNumber);
+  } else if (event.shiftKey) {
+    if (lineNumber < current[0]) {
+      range = [lineNumber, current[0]];
+    } else {
+      range = [current[0], lineNumber];
+    }
+    this.setHash(range[0], range[1]);
+    return this.highlightRange(range);
+  }
+};
+
+LineHighlighter.prototype.clearHighlight = function() {
+  return $("." + this.highlightLineClass).removeClass(this.highlightLineClass);
+};
+
+// Convert a URL hash String into line numbers
+//
+// hash - Hash String
+//
+// Examples:
+//
+//   hashToRange('#L5')    # => [5, null]
+//   hashToRange('#L5-15') # => [5, 15]
+//   hashToRange('#foo')   # => [null, null]
+//
+// Returns an Array
+LineHighlighter.prototype.hashToRange = function(hash) {
+  var first, last, matches;
+  // ?L(\d+)(?:-(\d+))?$/)
+  matches = hash.match(/^#?L(\d+)(?:-(\d+))?$/);
+  if (matches && matches.length) {
+    first = parseInt(matches[1], 10);
+    last = matches[2] ? parseInt(matches[2], 10) : null;
+    return [first, last];
+  } else {
+    return [null, null];
+  }
+};
+
+// Highlight a single line
+//
+// lineNumber - Line number to highlight
+LineHighlighter.prototype.highlightLine = function(lineNumber) {
+  return $("#LC" + lineNumber).addClass(this.highlightLineClass);
+};
+
+// Highlight all lines within a range
+//
+// range - Array containing the starting and ending line numbers
+LineHighlighter.prototype.highlightRange = function(range) {
+  var i, lineNumber, ref, ref1, results;
+  if (range[1]) {
+    results = [];
+    for (lineNumber = i = ref = range[0], ref1 = range[1]; ref <= ref1 ? i <= ref1 : i >= ref1; lineNumber = ref <= ref1 ? (i += 1) : (i -= 1)) {
+      results.push(this.highlightLine(lineNumber));
+    }
+    return results;
+  } else {
+    return this.highlightLine(range[0]);
+  }
+};
+
+// Set the URL hash string
+LineHighlighter.prototype.setHash = function(firstLineNumber, lastLineNumber) {
+  var hash;
+  if (lastLineNumber) {
+    hash = "#L" + firstLineNumber + "-" + lastLineNumber;
+  } else {
+    hash = "#L" + firstLineNumber;
+  }
+  this._hash = hash;
+  return this.__setLocationHash__(hash);
+};
+
+// Make the actual hash change in the browser
+//
+// This method is stubbed in tests.
+LineHighlighter.prototype.__setLocationHash__ = function(value) {
+  return history.pushState({
+    url: value
+  // We're using pushState instead of assigning location.hash directly to
+  // prevent the page from scrolling on the hashchange event
+  }, document.title, value);
+};
+
+window.LineHighlighter = LineHighlighter;
diff --git a/app/assets/javascripts/repo/components/repo_preview.vue b/app/assets/javascripts/repo/components/repo_preview.vue
index 2200754cbef..0d9d132f766 100644
--- a/app/assets/javascripts/repo/components/repo_preview.vue
+++ b/app/assets/javascripts/repo/components/repo_preview.vue
@@ -1,23 +1,27 @@
 <script>
+/* global LineHighlighter */
+
 import Store from '../stores/repo_store';
 
 export default {
   data: () => Store,
-  mounted() {
-    this.highlightFile();
-  },
   computed: {
     html() {
       return this.activeFile.html;
     },
   },
-
   methods: {
     highlightFile() {
       $(this.$el).find('.file-content').syntaxHighlight();
     },
   },
-
+  mounted() {
+    this.highlightFile();
+    this.lineHighlighter = new LineHighlighter({
+      fileHolderSelector: '.blob-viewer-container',
+      scrollFileHolder: true,
+    });
+  },
   watch: {
     html() {
       this.$nextTick(() => {