Merge branch '24814-pipeline-tabs' into 'master'

Pipelines tabs

## What does this MR do?
Changes the URL when the builds tab is clicked making it possible to be shared.

1. Adds a standard way to handle linked tabs:
    *   This behaviour is already present in the merge requests, commit and user `show` page. 
    *    This MR introduces a reusable way to accomplish this behaviour for pages with static content.

2. Adds test:
    *   For the linked tabs reusable class
    *  For the pipelines tabs

## Why was this MR needed?
To allow having a sharable URL that represented the opened tab

![tabs](/uploads/91e663c12c6e9ac46a17aa3a9489dc72/tabs.gif)

## Does this MR meet the acceptance criteria?
- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
Closes #24814

See merge request !7709

1 files changed, 113 insertions, 0 deletions

diff --git a/app/assets/javascripts/lib/utils/bootstrap_linked_tabs.js.es6 b/app/assets/javascripts/lib/utils/bootstrap_linked_tabs.js.es6
new file mode 100644
index 00000000000..e810ee85bd3
--- /dev/null
+++ b/app/assets/javascripts/lib/utils/bootstrap_linked_tabs.js.es6
@@ -0,0 +1,113 @@
+/**
+ * Linked Tabs
+ *
+ * Handles persisting and restores the current tab selection and content.
+ * Reusable component for static content.
+ *
+ * ### Example Markup
+ *
+ *  <ul class="nav-links tab-links">
+ *    <li class="active">
+ *      <a data-action="tab1" data-target="#tab1" data-toggle="tab" href="/path/tab1">
+ *        Tab 1
+ *      </a>
+ *    </li>
+ *    <li class="groups-tab">
+ *      <a data-action="tab2" data-target="#tab2" data-toggle="tab" href="/path/tab2">
+ *        Tab 2
+ *      </a>
+ *    </li>
+ *
+ *
+ *  <div class="tab-content">
+ *    <div class="tab-pane" id="tab1">
+ *      Tab 1 Content
+ *    </div>
+ *    <div class="tab-pane" id="tab2">
+ *      Tab 2 Content
+ *    </div>
+ * </div>
+ *
+ *
+ * ### How to use
+ *
+ *  new window.gl.LinkedTabs({
+ *    action: "#{controller.action_name}",
+ *    defaultAction: 'tab1',
+ *    parentEl: '.tab-links'
+ *  });
+ */
+
+(() => {
+  window.gl = window.gl || {};
+
+  window.gl.LinkedTabs = class LinkedTabs {
+    /**
+     * Binds the events and activates de default tab.
+     *
+     * @param  {Object} options
+     */
+    constructor(options) {
+      this.options = options || {};
+
+      this.defaultAction = this.options.defaultAction;
+      this.action = this.options.action || this.defaultAction;
+
+      if (this.action === 'show') {
+        this.action = this.defaultAction;
+      }
+
+      this.currentLocation = window.location;
+
+      const tabSelector = `${this.options.parentEl} a[data-toggle="tab"]`;
+
+      // since this is a custom event we need jQuery :(
+      $(document)
+        .off('shown.bs.tab', tabSelector)
+        .on('shown.bs.tab', tabSelector, e => this.tabShown(e));
+
+      this.activateTab(this.action);
+    }
+
+    /**
+     * Handles the `shown.bs.tab` event to set the currect url action.
+     *
+     * @param  {type} evt
+     * @return {Function}
+     */
+    tabShown(evt) {
+      const source = evt.target.getAttribute('href');
+
+      return this.setCurrentAction(source);
+    }
+
+    /**
+     * Updates the URL with the path that matched the given action.
+     *
+     * @param  {String} source
+     * @return {String}
+     */
+    setCurrentAction(source) {
+      const copySource = source;
+
+      copySource.replace(/\/+$/, '');
+
+      const newState = `${copySource}${this.currentLocation.search}${this.currentLocation.hash}`;
+
+      history.replaceState({
+        turbolinks: true,
+        url: newState,
+      }, document.title, newState);
+      return newState;
+    }
+
+    /**
+     * Given the current action activates the correct tab.
+     * http://getbootstrap.com/javascript/#tab-show
+     * Note: Will trigger `shown.bs.tab`
+     */
+    activateTab() {
+      return $(`${this.options.parentEl} a[data-action='${this.action}']`).tab('show');
+    }
+  };
+})();