Show history section and its tabs only when it's needed

app/modules/history/history-tabs/history-tabs.directive.coffee

@@ -20,10 +20,11 @@
 module = angular.module('taigaHistory')
 
 HistoryTabsDirective = () ->
-
     return {
         templateUrl:"history/history-tabs/history-tabs.html",
         scope: {
+            showCommentTab: "&",
+            showActivityTab: "&"
             onActiveComments: "&",
             onActiveActivities: "&",
             onOrderComments: "&"

app/modules/history/history-tabs/history-tabs.jade

@@ -1,5 +1,6 @@
 nav.history-tabs
     a.history-tab.e2e-comments-tab(
+        ng-if="showCommentTab()"
         href=""
         title="{{COMMENTS.COMMENT}}"
         ng-click="onActiveComments()"
@@ -8,6 +9,7 @@ nav.history-tabs
         translate-values="{comments: commentsNum}"
     )
     a.history-tab.e2e-activity-tab(
+        ng-if="showActivityTab()"
         href=""
         title="Activities"
         ng-click="onActiveActivities()"
@@ -22,7 +24,7 @@ nav.history-tabs
         ng-class="{'new-first': top, 'old-first': !top}"
         ng-if="commentsNum > 1 && activeTab"
     )
-    
+
         span(
             translate="COMMENTS.OLDER_FIRST"
             ng-if="onReverse"

app/modules/history/history.controller.coffee

@@ -24,9 +24,10 @@ class HistorySectionController
         "$tgResources",
         "$tgRepo",
         "$tgStorage",
+        "tgProjectService",
     ]
 
-    constructor: (@rs, @repo, @storage) ->
+    constructor: (@rs, @repo, @storage, @projectService) ->
         @.editing = null
         @.deleting = null
         @.editMode = {}
@@ -49,6 +50,15 @@ class HistorySectionController
         @.activities =  _.filter(activities, (item) -> Object.keys(item.values_diff).length > 0)
         @.activitiesNum = @.activities.length
 
+    showHistorySection: () ->
+        return @.showCommentTab() or @.showActivityTab()
+
+    showCommentTab: () ->
+        return @.commentsNum > 0 or @projectService.hasPermission("comment_#{@.name}")
+
+    showActivityTab: () ->
+        return @.activitiesNum > 0
+
     toggleEditMode: (commentId) ->
         @.editMode[commentId] = !@.editMode[commentId]
 

app/modules/history/history.jade

@@ -1,5 +1,9 @@
-section.history
+section.history(
+    ng-if="vm.showHistorySection()"
+)
     tg-history-tabs(
+        show-comment-tab="vm.showCommentTab()"
+        show-activity-tab="vm.showActivityTab()"
         on-active-comments="vm.onActiveHistoryTab(true)"
         on-active-activities="vm.onActiveHistoryTab(false)"
         active-tab="vm.viewComments",