diff --git a/services/web/public/src/ide/binary-files/controllers/BinaryFileController.js b/services/web/public/src/ide/binary-files/controllers/BinaryFileController.js
index a7c93e5315..603b666201 100644
--- a/services/web/public/src/ide/binary-files/controllers/BinaryFileController.js
+++ b/services/web/public/src/ide/binary-files/controllers/BinaryFileController.js
@@ -1,3 +1,19 @@
+/* eslint-disable
+    camelcase,
+    max-len,
+    no-return-assign,
+    no-undef,
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * DS103: Rewrite code to no longer use __guard__
+ * DS207: Consider shorter variations of null checks
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
 define(['base', 'moment'], (App, moment) =>
   App.controller('BinaryFileController', [
     '$scope',
@@ -8,22 +24,25 @@ define(['base', 'moment'], (App, moment) =>
     'ide',
     'waitFor',
     function($scope, $rootScope, $http, $timeout, $element, ide, waitFor) {
+      let loadTextFileFilePreview, setHeight
+      const TWO_MEGABYTES = 2 * 1024 * 1024
+
       const textExtensions = ['bib', 'tex', 'txt', 'cls', 'sty']
       const imageExtensions = ['png', 'jpg', 'jpeg', 'gif']
       const previewableExtensions = []
 
       const extension = file =>
-        file.name
-          .split('.')
-          .pop()
-          .toLowerCase()
+        __guard__(file.name.split('.').pop(), x => x.toLowerCase())
 
-      $scope.isTextFile = () =>
-        textExtensions.indexOf(extension($scope.openFile)) > -1
-      $scope.isImageFile = () =>
-        imageExtensions.indexOf(extension($scope.openFile)) > -1
-      $scope.isPreviewableFile = () =>
-        previewableExtensions.indexOf(extension($scope.openFile)) > -1
+      $scope.isTextFile = () => {
+        return textExtensions.indexOf(extension($scope.openFile)) > -1
+      }
+      $scope.isImageFile = () => {
+        return imageExtentions.indexOf(extension($scope.openFile)) > -1
+      }
+      $scope.isPreviewableFile = () => {
+        return previewableExtensions.indexOf(extension($scope.openFile)) > -1
+      }
       $scope.isUnpreviewableFile = () =>
         !$scope.isTextFile() &&
         !$scope.isImageFile() &&
@@ -60,15 +79,15 @@ define(['base', 'moment'], (App, moment) =>
       $scope.refreshFile = function(file) {
         $scope.refreshing = true
         $scope.refreshError = null
-        ide.fileTreeManager
+        return ide.fileTreeManager
           .refreshLinkedFile(file)
           .then(function(response) {
             const { data } = response
-            const { newFileId } = data
+            const { new_file_id } = data
             $timeout(
               () =>
                 waitFor(
-                  () => ide.fileTreeManager.findEntityById(newFileId),
+                  () => ide.fileTreeManager.findEntityById(new_file_id),
                   5000
                 )
                   .then(newFile => ide.binaryFilesManager.openFile(newFile))
@@ -76,7 +95,7 @@ define(['base', 'moment'], (App, moment) =>
 
               0
             )
-            $scope.refreshError = null
+            return ($scope.refreshError = null)
           })
           .catch(response => ($scope.refreshError = response.data))
           .finally(() => {
@@ -97,7 +116,7 @@ define(['base', 'moment'], (App, moment) =>
       $scope.failedLoad = false
       window.sl_binaryFilePreviewError = () => {
         $scope.failedLoad = true
-        $scope.$apply()
+        return $scope.$apply()
       }
 
       // Callback fired when the `img` tag is done loading,
@@ -105,7 +124,69 @@ define(['base', 'moment'], (App, moment) =>
       $scope.imgLoaded = false
       window.sl_binaryFilePreviewLoaded = () => {
         $scope.imgLoaded = true
-        $scope.$apply()
+        return $scope.$apply()
       }
+      ;(loadTextFileFilePreview = function() {
+        if (!$scope.isTextFile()) {
+          return
+        }
+        const url = `/project/${project_id}/file/${
+          $scope.openFile.id
+        }?range=0-${TWO_MEGABYTES}`
+        $scope.textPreview.data = null
+        $scope.textPreview.loading = true
+        $scope.textPreview.shouldShowDots = false
+        $scope.$apply()
+        return $http({
+          url,
+          method: 'GET',
+          transformResponse: null // Don't parse JSON
+        })
+          .then(function(response) {
+            let { data } = response
+            $scope.textPreview.error = false
+            // show dots when payload is closs to cutoff
+            if (data.length >= TWO_MEGABYTES - 200) {
+              $scope.textPreview.shouldShowDots = true
+              // remove last partial line
+              data = __guardMethod__(data, 'replace', o =>
+                o.replace(/\n.*$/, '')
+              )
+            }
+            $scope.textPreview.data = data
+            return $timeout(setHeight, 0)
+          })
+          .catch(function(error) {
+            console.error(error)
+            $scope.textPreview.error = true
+            return ($scope.textPreview.loading = false)
+          })
+      })()
+
+      return (setHeight = function() {
+        const $preview = $element.find('.text-preview .scroll-container')
+        const $footer = $element.find('.binary-file-footer')
+        const maxHeight = $element.height() - $footer.height() - 14 // borders + margin
+        $preview.css({ 'max-height': maxHeight })
+        // Don't show the preview until we've set the height, otherwise we jump around
+        return ($scope.textPreview.loading = false)
+      })
     }
   ]))
+
+function __guard__(value, transform) {
+  return typeof value !== 'undefined' && value !== null
+    ? transform(value)
+    : undefined
+}
+function __guardMethod__(obj, methodName, transform) {
+  if (
+    typeof obj !== 'undefined' &&
+    obj !== null &&
+    typeof obj[methodName] === 'function'
+  ) {
+    return transform(obj, methodName)
+  } else {
+    return undefined
+  }
+}