Make file templates easy to use and discover

31 files changed, 832 insertions, 217 deletions

diff --git a/app/assets/javascripts/blob/file_template_mediator.js b/app/assets/javascripts/blob/file_template_mediator.js
new file mode 100644
index 00000000000..3062cd51ee3
--- /dev/null
+++ b/app/assets/javascripts/blob/file_template_mediator.js
@@ -0,0 +1,241 @@
+/* eslint-disable class-methods-use-this */
+/* global Flash */
+
+import FileTemplateTypeSelector from './template_selectors/type_selector';
+import BlobCiYamlSelector from './template_selectors/ci_yaml_selector';
+import DockerfileSelector from './template_selectors/dockerfile_selector';
+import GitignoreSelector from './template_selectors/gitignore_selector';
+import LicenseSelector from './template_selectors/license_selector';
+
+export default class FileTemplateMediator {
+  constructor({ editor, currentAction }) {
+    this.editor = editor;
+    this.currentAction = currentAction;
+
+    this.initTemplateSelectors();
+    this.initTemplateTypeSelector();
+    this.initDomElements();
+    this.initDropdowns();
+    this.initPageEvents();
+  }
+
+  initTemplateSelectors() {
+    // Order dictates template type dropdown item order
+    this.templateSelectors = [
+      GitignoreSelector,
+      BlobCiYamlSelector,
+      DockerfileSelector,
+      LicenseSelector,
+    ].map(TemplateSelectorClass => new TemplateSelectorClass({ mediator: this }));
+  }
+
+  initTemplateTypeSelector() {
+    this.typeSelector = new FileTemplateTypeSelector({
+      mediator: this,
+      dropdownData: this.templateSelectors
+        .map((templateSelector) => {
+          const cfg = templateSelector.config;
+
+          return {
+            name: cfg.name,
+            key: cfg.key,
+          };
+        }),
+    });
+  }
+
+  initDomElements() {
+    const $templatesMenu = $('.template-selectors-menu');
+    const $undoMenu = $templatesMenu.find('.template-selectors-undo-menu');
+    const $fileEditor = $('.file-editor');
+
+    this.$templatesMenu = $templatesMenu;
+    this.$undoMenu = $undoMenu;
+    this.$undoBtn = $undoMenu.find('button');
+    this.$templateSelectors = $templatesMenu.find('.template-selector-dropdowns-wrap');
+    this.$filenameInput = $fileEditor.find('.js-file-path-name-input');
+    this.$fileContent = $fileEditor.find('#file-content');
+    this.$commitForm = $fileEditor.find('form');
+    this.$navLinks = $fileEditor.find('.nav-links');
+  }
+
+  initDropdowns() {
+    if (this.currentAction === 'create') {
+      this.typeSelector.show();
+    } else {
+      this.hideTemplateSelectorMenu();
+    }
+
+    this.displayMatchedTemplateSelector();
+  }
+
+  initPageEvents() {
+    this.listenForFilenameInput();
+    this.prepFileContentForSubmit();
+    this.listenForPreviewMode();
+  }
+
+  listenForFilenameInput() {
+    this.$filenameInput.on('keyup blur', () => {
+      this.displayMatchedTemplateSelector();
+    });
+  }
+
+  prepFileContentForSubmit() {
+    this.$commitForm.submit(() => {
+      this.$fileContent.val(this.editor.getValue());
+    });
+  }
+
+  listenForPreviewMode() {
+    this.$navLinks.on('click', 'a', (e) => {
+      const urlPieces = e.target.href.split('#');
+      const hash = urlPieces[1];
+      if (hash === 'preview') {
+        this.hideTemplateSelectorMenu();
+      } else if (hash === 'editor') {
+        this.showTemplateSelectorMenu();
+      }
+    });
+  }
+
+  selectTemplateType(item, el, e) {
+    if (e) {
+      e.preventDefault();
+    }
+
+    this.templateSelectors.forEach((selector) => {
+      if (selector.config.key === item.key) {
+        selector.show();
+      } else {
+        selector.hide();
+      }
+    });
+
+    this.typeSelector.setToggleText(item.name);
+
+    this.cacheToggleText();
+  }
+
+  selectTemplateFile(selector, query, data) {
+    selector.renderLoading();
+    // in case undo menu is already already there
+    this.destroyUndoMenu();
+    this.fetchFileTemplate(selector.config.endpoint, query, data)
+      .then((file) => {
+        this.showUndoMenu();
+        this.setEditorContent(file);
+        this.setFilename(selector.config.name);
+        selector.renderLoaded();
+      })
+      .catch(err => new Flash(`An error occurred while fetching the template: ${err}`));
+  }
+
+  displayMatchedTemplateSelector() {
+    const currentInput = this.getFilename();
+    this.templateSelectors.forEach((selector) => {
+      const match = selector.config.pattern.test(currentInput);
+
+      if (match) {
+        this.typeSelector.show();
+        this.selectTemplateType(selector.config);
+        this.showTemplateSelectorMenu();
+      }
+    });
+  }
+
+  fetchFileTemplate(apiCall, query, data) {
+    return new Promise((resolve) => {
+      const resolveFile = file => resolve(file);
+
+      if (!data) {
+        apiCall(query, resolveFile);
+      } else {
+        apiCall(query, data, resolveFile);
+      }
+    });
+  }
+
+  setEditorContent(file) {
+    if (!file && file !== '') return;
+
+    const newValue = file.content || file;
+
+    this.editor.setValue(newValue, 1);
+
+    this.editor.focus();
+
+    this.editor.navigateFileStart();
+  }
+
+  findTemplateSelectorByKey(key) {
+    return this.templateSelectors.find(selector => selector.config.key === key);
+  }
+
+  showUndoMenu() {
+    this.$undoMenu.removeClass('hidden');
+
+    this.$undoBtn.on('click', () => {
+      this.restoreFromCache();
+      this.destroyUndoMenu();
+    });
+  }
+
+  destroyUndoMenu() {
+    this.cacheFileContents();
+    this.cacheToggleText();
+    this.$undoMenu.addClass('hidden');
+    this.$undoBtn.off('click');
+  }
+
+  hideTemplateSelectorMenu() {
+    this.$templatesMenu.hide();
+  }
+
+  showTemplateSelectorMenu() {
+    this.$templatesMenu.show();
+  }
+
+  cacheToggleText() {
+    this.cachedToggleText = this.getTemplateSelectorToggleText();
+  }
+
+  cacheFileContents() {
+    this.cachedContent = this.editor.getValue();
+    this.cachedFilename = this.getFilename();
+  }
+
+  restoreFromCache() {
+    this.setEditorContent(this.cachedContent);
+    this.setFilename(this.cachedFilename);
+    this.setTemplateSelectorToggleText();
+  }
+
+  getTemplateSelectorToggleText() {
+    return this.$templateSelectors
+      .find('.js-template-selector-wrap:visible .dropdown-toggle-text')
+      .text();
+  }
+
+  setTemplateSelectorToggleText() {
+    return this.$templateSelectors
+      .find('.js-template-selector-wrap:visible .dropdown-toggle-text')
+      .text(this.cachedToggleText);
+  }
+
+  getTypeSelectorToggleText() {
+    return this.typeSelector.getToggleText();
+  }
+
+  getFilename() {
+    return this.$filenameInput.val();
+  }
+
+  setFilename(name) {
+    this.$filenameInput.val(name);
+  }
+
+  getSelected() {
+    return this.templateSelectors.find(selector => selector.selected);
+  }
+}
diff --git a/app/assets/javascripts/blob/file_template_selector.js b/app/assets/javascripts/blob/file_template_selector.js
new file mode 100644
index 00000000000..31dd45fac89
--- /dev/null
+++ b/app/assets/javascripts/blob/file_template_selector.js
@@ -0,0 +1,60 @@
+/* global Api */
+
+export default class FileTemplateSelector {
+  constructor(mediator) {
+    this.mediator = mediator;
+    this.$dropdown = null;
+    this.$wrapper = null;
+  }
+
+  init() {
+    const cfg = this.config;
+
+    this.$dropdown = $(cfg.dropdown);
+    this.$wrapper = $(cfg.wrapper);
+    this.$loadingIcon = this.$wrapper.find('.fa-chevron-down');
+    this.$dropdownToggleText = this.$wrapper.find('.dropdown-toggle-text');
+
+    this.initDropdown();
+  }
+
+  show() {
+    if (this.$dropdown === null) {
+      this.init();
+    }
+
+    this.$wrapper.removeClass('hidden');
+  }
+
+  hide() {
+    if (this.$dropdown !== null) {
+      this.$wrapper.addClass('hidden');
+    }
+  }
+
+  getToggleText() {
+    return this.$dropdownToggleText.text();
+  }
+
+  setToggleText(text) {
+    this.$dropdownToggleText.text(text);
+  }
+
+  renderLoading() {
+    this.$loadingIcon
+      .addClass('fa-spinner fa-spin')
+      .removeClass('fa-chevron-down');
+  }
+
+  renderLoaded() {
+    this.$loadingIcon
+      .addClass('fa-chevron-down')
+      .removeClass('fa-spinner fa-spin');
+  }
+
+  reportSelection(query, el, e, data) {
+    e.preventDefault();
+    return this.mediator.selectTemplateFile(this, query, data);
+  }
+}
+
diff --git a/app/assets/javascripts/blob/template_selectors/template_selector.js b/app/assets/javascripts/blob/template_selector.js
index d7c1c32efbd..d7c1c32efbd 100644
--- a/app/assets/javascripts/blob/template_selectors/template_selector.js
+++ b/app/assets/javascripts/blob/template_selector.js
diff --git a/app/assets/javascripts/blob/template_selectors/blob_ci_yaml_selector.js b/app/assets/javascripts/blob/template_selectors/blob_ci_yaml_selector.js
deleted file mode 100644
index 5a5954e7751..00000000000
--- a/app/assets/javascripts/blob/template_selectors/blob_ci_yaml_selector.js
+++ /dev/null
@@ -1,9 +0,0 @@
-/* global Api */
-
-import TemplateSelector from './template_selector';
-
-export default class BlobCiYamlSelector extends TemplateSelector {
-  requestFile(query) {
-    return Api.gitlabCiYml(query.name, (file, config) => this.setEditorContent(file, config));
-  }
-}
diff --git a/app/assets/javascripts/blob/template_selectors/blob_ci_yaml_selectors.js b/app/assets/javascripts/blob/template_selectors/blob_ci_yaml_selectors.js
deleted file mode 100644
index 7a4d6a42a03..00000000000
--- a/app/assets/javascripts/blob/template_selectors/blob_ci_yaml_selectors.js
+++ /dev/null
@@ -1,23 +0,0 @@
-/* global Api */
-
-import BlobCiYamlSelector from './blob_ci_yaml_selector';
-
-export default class BlobCiYamlSelectors {
-  constructor({ editor, $dropdowns }) {
-    this.$dropdowns = $dropdowns || $('.js-gitlab-ci-yml-selector');
-    this.initSelectors(editor);
-  }
-
-  initSelectors(editor) {
-    this.$dropdowns.each((i, dropdown) => {
-      const $dropdown = $(dropdown);
-      return new BlobCiYamlSelector({
-        editor,
-        pattern: /(.gitlab-ci.yml)/,
-        data: $dropdown.data('data'),
-        wrapper: $dropdown.closest('.js-gitlab-ci-yml-selector-wrap'),
-        dropdown: $dropdown,
-      });
-    });
-  }
-}
diff --git a/app/assets/javascripts/blob/template_selectors/blob_dockerfile_selector.js b/app/assets/javascripts/blob/template_selectors/blob_dockerfile_selector.js
deleted file mode 100644
index 19f8820a0cb..00000000000
--- a/app/assets/javascripts/blob/template_selectors/blob_dockerfile_selector.js
+++ /dev/null
@@ -1,9 +0,0 @@
-/* global Api */
-
-import TemplateSelector from './template_selector';
-
-export default class BlobDockerfileSelector extends TemplateSelector {
-  requestFile(query) {
-    return Api.dockerfileYml(query.name, (file, config) => this.setEditorContent(file, config));
-  }
-}
diff --git a/app/assets/javascripts/blob/template_selectors/blob_dockerfile_selectors.js b/app/assets/javascripts/blob/template_selectors/blob_dockerfile_selectors.js
deleted file mode 100644
index da067035b43..00000000000
--- a/app/assets/javascripts/blob/template_selectors/blob_dockerfile_selectors.js
+++ /dev/null
@@ -1,23 +0,0 @@
-import BlobDockerfileSelector from './blob_dockerfile_selector';
-
-export default class BlobDockerfileSelectors {
-  constructor({ editor, $dropdowns }) {
-    this.editor = editor;
-    this.$dropdowns = $dropdowns || $('.js-dockerfile-selector');
-    this.initSelectors();
-  }
-
-  initSelectors() {
-    const editor = this.editor;
-    this.$dropdowns.each((i, dropdown) => {
-      const $dropdown = $(dropdown);
-      return new BlobDockerfileSelector({
-        editor,
-        pattern: /(Dockerfile)/,
-        data: $dropdown.data('data'),
-        wrapper: $dropdown.closest('.js-dockerfile-selector-wrap'),
-        dropdown: $dropdown,
-      });
-    });
-  }
-}
diff --git a/app/assets/javascripts/blob/template_selectors/blob_gitignore_selector.js b/app/assets/javascripts/blob/template_selectors/blob_gitignore_selector.js
deleted file mode 100644
index 0b6b02fc2b3..00000000000
--- a/app/assets/javascripts/blob/template_selectors/blob_gitignore_selector.js
+++ /dev/null
@@ -1,9 +0,0 @@
-/* global Api */
-
-import TemplateSelector from './template_selector';
-
-export default class BlobGitignoreSelector extends TemplateSelector {
-  requestFile(query) {
-    return Api.gitignoreText(query.name, (file, config) => this.setEditorContent(file, config));
-  }
-}
diff --git a/app/assets/javascripts/blob/template_selectors/blob_gitignore_selectors.js b/app/assets/javascripts/blob/template_selectors/blob_gitignore_selectors.js
deleted file mode 100644
index dc485d97677..00000000000
--- a/app/assets/javascripts/blob/template_selectors/blob_gitignore_selectors.js
+++ /dev/null
@@ -1,23 +0,0 @@
-import BlobGitignoreSelector from './blob_gitignore_selector';
-
-export default class BlobGitignoreSelectors {
-  constructor({ editor, $dropdowns }) {
-    this.$dropdowns = $dropdowns || $('.js-gitignore-selector');
-    this.editor = editor;
-    this.initSelectors();
-  }
-
-  initSelectors() {
-    this.$dropdowns.each((i, dropdown) => {
-      const $dropdown = $(dropdown);
-
-      return new BlobGitignoreSelector({
-        pattern: /(.gitignore)/,
-        data: $dropdown.data('data'),
-        wrapper: $dropdown.closest('.js-gitignore-selector-wrap'),
-        dropdown: $dropdown,
-        editor: this.editor,
-      });
-    });
-  }
-}
diff --git a/app/assets/javascripts/blob/template_selectors/blob_license_selector.js b/app/assets/javascripts/blob/template_selectors/blob_license_selector.js
deleted file mode 100644
index e9cb31cc2dc..00000000000
--- a/app/assets/javascripts/blob/template_selectors/blob_license_selector.js
+++ /dev/null
@@ -1,13 +0,0 @@
-/* global Api */
-
-import TemplateSelector from './template_selector';
-
-export default class BlobLicenseSelector extends TemplateSelector {
-  requestFile(query) {
-    const data = {
-      project: this.dropdown.data('project'),
-      fullname: this.dropdown.data('fullname'),
-    };
-    return Api.licenseText(query.id, data, (file, config) => this.setEditorContent(file, config));
-  }
-}
diff --git a/app/assets/javascripts/blob/template_selectors/blob_license_selectors.js b/app/assets/javascripts/blob/template_selectors/blob_license_selectors.js
deleted file mode 100644
index a44f4f78b2d..00000000000
--- a/app/assets/javascripts/blob/template_selectors/blob_license_selectors.js
+++ /dev/null
@@ -1,24 +0,0 @@
-/* eslint-disable no-unused-vars, no-param-reassign */
-
-import BlobLicenseSelector from './blob_license_selector';
-
-export default class BlobLicenseSelectors {
-  constructor({ $dropdowns, editor }) {
-    this.$dropdowns = $dropdowns || $('.js-license-selector');
-    this.initSelectors(editor);
-  }
-
-  initSelectors(editor) {
-    this.$dropdowns.each((i, dropdown) => {
-      const $dropdown = $(dropdown);
-
-      return new BlobLicenseSelector({
-        editor,
-        pattern: /^(.+\/)?(licen[sc]e|copying)($|\.)/i,
-        data: $dropdown.data('data'),
-        wrapper: $dropdown.closest('.js-license-selector-wrap'),
-        dropdown: $dropdown,
-      });
-    });
-  }
-}
diff --git a/app/assets/javascripts/blob/template_selectors/ci_yaml_selector.js b/app/assets/javascripts/blob/template_selectors/ci_yaml_selector.js
new file mode 100644
index 00000000000..935df07677c
--- /dev/null
+++ b/app/assets/javascripts/blob/template_selectors/ci_yaml_selector.js
@@ -0,0 +1,32 @@
+/* global Api */
+
+import FileTemplateSelector from '../file_template_selector';
+
+export default class BlobCiYamlSelector extends FileTemplateSelector {
+  constructor({ mediator }) {
+    super(mediator);
+    this.config = {
+      key: 'gitlab-ci-yaml',
+      name: '.gitlab-ci.yml',
+      pattern: /(.gitlab-ci.yml)/,
+      endpoint: Api.gitlabCiYml,
+      dropdown: '.js-gitlab-ci-yml-selector',
+      wrapper: '.js-gitlab-ci-yml-selector-wrap',
+    };
+  }
+
+  initDropdown() {
+    // maybe move to super class as well
+    this.$dropdown.glDropdown({
+      data: this.$dropdown.data('data'),
+      filterable: true,
+      selectable: true,
+      toggleLabel: item => item.name,
+      search: {
+        fields: ['name'],
+      },
+      clicked: (query, el, e) => this.reportSelection(query.name, el, e),
+      text: item => item.name,
+    });
+  }
+}
diff --git a/app/assets/javascripts/blob/template_selectors/dockerfile_selector.js b/app/assets/javascripts/blob/template_selectors/dockerfile_selector.js
new file mode 100644
index 00000000000..b4b4d09c315
--- /dev/null
+++ b/app/assets/javascripts/blob/template_selectors/dockerfile_selector.js
@@ -0,0 +1,32 @@
+/* global Api */
+
+import FileTemplateSelector from '../file_template_selector';
+
+export default class DockerfileSelector extends FileTemplateSelector {
+  constructor({ mediator }) {
+    super(mediator);
+    this.config = {
+      key: 'dockerfile',
+      name: 'Dockerfile',
+      pattern: /(Dockerfile)/,
+      endpoint: Api.dockerfileYml,
+      dropdown: '.js-dockerfile-selector',
+      wrapper: '.js-dockerfile-selector-wrap',
+    };
+  }
+
+  initDropdown() {
+    // maybe move to super class as well
+    this.$dropdown.glDropdown({
+      data: this.$dropdown.data('data'),
+      filterable: true,
+      selectable: true,
+      toggleLabel: item => item.name,
+      search: {
+        fields: ['name'],
+      },
+      clicked: (query, el, e) => this.reportSelection(query.name, el, e),
+      text: item => item.name,
+    });
+  }
+}
diff --git a/app/assets/javascripts/blob/template_selectors/gitignore_selector.js b/app/assets/javascripts/blob/template_selectors/gitignore_selector.js
new file mode 100644
index 00000000000..aefae54ae71
--- /dev/null
+++ b/app/assets/javascripts/blob/template_selectors/gitignore_selector.js
@@ -0,0 +1,31 @@
+/* global Api */
+
+import FileTemplateSelector from '../file_template_selector';
+
+export default class BlobGitignoreSelector extends FileTemplateSelector {
+  constructor({ mediator }) {
+    super(mediator);
+    this.config = {
+      key: 'gitignore',
+      name: '.gitignore',
+      pattern: /(.gitignore)/,
+      endpoint: Api.gitignoreText,
+      dropdown: '.js-gitignore-selector',
+      wrapper: '.js-gitignore-selector-wrap',
+    };
+  }
+
+  initDropdown() {
+    this.$dropdown.glDropdown({
+      data: this.$dropdown.data('data'),
+      filterable: true,
+      selectable: true,
+      toggleLabel: item => item.name,
+      search: {
+        fields: ['name'],
+      },
+      clicked: (query, el, e) => this.reportSelection(query.name, el, e),
+      text: item => item.name,
+    });
+  }
+}
diff --git a/app/assets/javascripts/blob/template_selectors/license_selector.js b/app/assets/javascripts/blob/template_selectors/license_selector.js
new file mode 100644
index 00000000000..c8abd689ab4
--- /dev/null
+++ b/app/assets/javascripts/blob/template_selectors/license_selector.js
@@ -0,0 +1,38 @@
+/* global Api */
+
+import FileTemplateSelector from '../file_template_selector';
+
+export default class BlobLicenseSelector extends FileTemplateSelector {
+  constructor({ mediator }) {
+    super(mediator);
+    this.config = {
+      key: 'license',
+      name: 'LICENSE',
+      pattern: /^(.+\/)?(licen[sc]e|copying)($|\.)/i,
+      endpoint: Api.licenseText,
+      dropdown: '.js-license-selector',
+      wrapper: '.js-license-selector-wrap',
+    };
+  }
+
+  initDropdown() {
+    this.$dropdown.glDropdown({
+      data: this.$dropdown.data('data'),
+      filterable: true,
+      selectable: true,
+      toggleLabel: item => item.name,
+      search: {
+        fields: ['name'],
+      },
+      clicked: (query, el, e) => {
+        const data = {
+          project: this.$dropdown.data('project'),
+          fullname: this.$dropdown.data('fullname'),
+        };
+
+        this.reportSelection(query.id, el, e, data);
+      },
+      text: item => item.name,
+    });
+  }
+}
diff --git a/app/assets/javascripts/blob/template_selectors/type_selector.js b/app/assets/javascripts/blob/template_selectors/type_selector.js
new file mode 100644
index 00000000000..56f23ef0568
--- /dev/null
+++ b/app/assets/javascripts/blob/template_selectors/type_selector.js
@@ -0,0 +1,25 @@
+import FileTemplateSelector from '../file_template_selector';
+
+export default class FileTemplateTypeSelector extends FileTemplateSelector {
+  constructor({ mediator, dropdownData }) {
+    super(mediator);
+    this.mediator = mediator;
+    this.config = {
+      dropdown: '.js-template-type-selector',
+      wrapper: '.js-template-type-selector-wrap',
+      dropdownData,
+    };
+  }
+
+  initDropdown() {
+    this.$dropdown.glDropdown({
+      data: this.config.dropdownData,
+      filterable: false,
+      selectable: true,
+      toggleLabel: item => item.name,
+      clicked: (item, el, e) => this.mediator.selectTemplateType(item, el, e),
+      text: item => item.name,
+    });
+  }
+
+}
diff --git a/app/assets/javascripts/blob_edit/blob_bundle.js b/app/assets/javascripts/blob_edit/blob_bundle.js
index c5deccf631e..1c64ccf536f 100644
--- a/app/assets/javascripts/blob_edit/blob_bundle.js
+++ b/app/assets/javascripts/blob_edit/blob_bundle.js
@@ -13,8 +13,9 @@ $(() => {
     const urlRoot = editBlobForm.data('relative-url-root');
     const assetsPath = editBlobForm.data('assets-prefix');
     const blobLanguage = editBlobForm.data('blob-language');
+    const currentAction = $('.js-file-title').data('current-action');
 
-    new EditBlob(`${urlRoot}${assetsPath}`, blobLanguage);
+    new EditBlob(`${urlRoot}${assetsPath}`, blobLanguage, currentAction);
     new NewCommitForm(editBlobForm);
   }
 
diff --git a/app/assets/javascripts/blob_edit/edit_blob.js b/app/assets/javascripts/blob_edit/edit_blob.js
index d3560d5df3b..b37988a674d 100644
--- a/app/assets/javascripts/blob_edit/edit_blob.js
+++ b/app/assets/javascripts/blob_edit/edit_blob.js
@@ -1,17 +1,13 @@
 /* global ace */
 
-import BlobLicenseSelectors from '../blob/template_selectors/blob_license_selectors';
-import BlobGitignoreSelectors from '../blob/template_selectors/blob_gitignore_selectors';
-import BlobCiYamlSelectors from '../blob/template_selectors/blob_ci_yaml_selectors';
-import BlobDockerfileSelectors from '../blob/template_selectors/blob_dockerfile_selectors';
+import TemplateSelectorMediator from '../blob/file_template_mediator';
 
 export default class EditBlob {
-  constructor(assetsPath, aceMode) {
+  constructor(assetsPath, aceMode, currentAction) {
     this.configureAceEditor(aceMode, assetsPath);
-    this.prepFileContentForSubmit();
     this.initModePanesAndLinks();
     this.initSoftWrap();
-    this.initFileSelectors();
+    this.initFileSelectors(currentAction);
   }
 
   configureAceEditor(aceMode, assetsPath) {
@@ -19,6 +15,10 @@ export default class EditBlob {
     ace.config.loadModule('ace/ext/searchbox');
 
     this.editor = ace.edit('editor');
+
+    // This prevents warnings re: automatic scrolling being logged
+    this.editor.$blockScrolling = Infinity;
+
     this.editor.focus();
 
     if (aceMode) {
@@ -26,29 +26,13 @@ export default class EditBlob {
     }
   }
 
-  prepFileContentForSubmit() {
-    $('form').submit(() => {
-      $('#file-content').val(this.editor.getValue());
+  initFileSelectors(currentAction) {
+    this.fileTemplateMediator = new TemplateSelectorMediator({
+      currentAction,
+      editor: this.editor,
     });
   }
 
-  initFileSelectors() {
-    this.blobTemplateSelectors = [
-      new BlobLicenseSelectors({
-        editor: this.editor,
-      }),
-      new BlobGitignoreSelectors({
-        editor: this.editor,
-      }),
-      new BlobCiYamlSelectors({
-        editor: this.editor,
-      }),
-      new BlobDockerfileSelectors({
-        editor: this.editor,
-      }),
-    ];
-  }
-
   initModePanesAndLinks() {
     this.$editModePanes = $('.js-edit-mode-pane');
     this.$editModeLinks = $('.js-edit-mode a');
diff --git a/app/assets/javascripts/templates/issuable_template_selector.js b/app/assets/javascripts/templates/issuable_template_selector.js
index 32067ed1fee..e62f429f1ae 100644
--- a/app/assets/javascripts/templates/issuable_template_selector.js
+++ b/app/assets/javascripts/templates/issuable_template_selector.js
@@ -1,7 +1,7 @@
 /* eslint-disable comma-dangle, max-len, no-useless-return, no-param-reassign, max-len */
 /* global Api */
 
-import TemplateSelector from '../blob/template_selectors/template_selector';
+import TemplateSelector from '../blob/template_selector';
 
 ((global) => {
   class IssuableTemplateSelector extends TemplateSelector {
diff --git a/app/assets/stylesheets/pages/editor.scss b/app/assets/stylesheets/pages/editor.scss
index 4af267403d8..f6b8c8ee2bc 100644
--- a/app/assets/stylesheets/pages/editor.scss
+++ b/app/assets/stylesheets/pages/editor.scss
@@ -1,4 +1,13 @@
 .file-editor {
+  .nav-links {
+    border-top: 1px solid $border-color;
+    border-right: 1px solid $border-color;
+    border-left: 1px solid $border-color;
+    border-bottom: none;
+    border-radius: 2px;
+    background: $gray-normal;
+  }
+
   #editor {
     border: none;
     border-radius: 0;
@@ -72,11 +81,7 @@
   }
 
   .encoding-selector,
-  .soft-wrap-toggle,
-  .license-selector,
-  .gitignore-selector,
-  .gitlab-ci-yml-selector,
-  .dockerfile-selector {
+  .soft-wrap-toggle {
     display: inline-block;
     vertical-align: top;
     font-family: $regular_font;
@@ -103,28 +108,9 @@
       }
     }
   }
-
-  .gitignore-selector,
-  .license-selector,
-  .gitlab-ci-yml-selector,
-  .dockerfile-selector {
-    .dropdown {
-      line-height: 21px;
-    }
-
-    .dropdown-menu-toggle {
-      vertical-align: top;
-      width: 220px;
-    }
-  }
-
-  .gitlab-ci-yml-selector {
-    .dropdown-menu-toggle {
-      width: 250px;
-    }
-  }
 }
 
+
 @media(max-width: $screen-xs-max){
   .file-editor {
     .file-title {
@@ -149,10 +135,7 @@
         margin: 3px 0;
       }
 
-      .encoding-selector,
-      .license-selector,
-      .gitignore-selector,
-      .gitlab-ci-yml-selector {
+      .encoding-selector {
         display: block;
         margin: 3px 0;
 
@@ -163,3 +146,104 @@
     }
   }
 }
+
+.blob-new-page-title,
+.blob-edit-page-title {
+  margin: 19px 0 21px;
+  vertical-align: top;
+  display: inline-block;
+
+  @media(max-width: $screen-sm-max) {
+    display: block;
+    margin: 19px 0 12px;
+  }
+}
+
+.template-selectors-menu {
+  display: inline-block;
+  vertical-align: top;
+  margin: 14px 0 0 16px;
+  padding: 0 0 0 14px;
+  border-left: 1px solid $border-color;
+
+  @media(max-width: $screen-sm-max) {
+    display: block;
+    width: 100%;
+    margin: 5px 0;
+    padding: 0;
+    border-left: none;
+  }
+}
+
+.templates-selectors-label {
+  display: inline-block;
+  vertical-align: top;
+  margin-top: 6px;
+  line-height: 21px;
+
+  @media(max-width: $screen-sm-max) {
+    display: block;
+    margin: 5px 0;
+  }
+}
+
+.template-selector-dropdowns-wrap {
+  display: inline-block;
+  margin-left: 8px;
+  vertical-align: top;
+  margin: 5px 0 0 8px;
+
+  @media(max-width: $screen-sm-max) {
+    display: block;
+    width: 100%;
+    margin: 0 0 16px;
+  }
+
+  .license-selector,
+  .gitignore-selector,
+  .gitlab-ci-yml-selector,
+  .dockerfile-selector,
+  .template-type-selector {
+    display: inline-block;
+    vertical-align: top;
+    font-family: $regular_font;
+    margin-top: -5px;
+
+    @media(max-width: $screen-sm-max) {
+      display: block;
+      width: 100%;
+      margin: 5px 0;
+    }
+
+    .dropdown {
+      line-height: 21px;
+    }
+
+    .dropdown-menu-toggle {
+      width: 250px;
+      vertical-align: top;
+
+      @media(max-width: $screen-sm-max) {
+        display: block;
+        width: 100%;
+        margin: 5px 0;
+      }
+    }
+
+  }
+}
+
+.template-selectors-undo-menu {
+  display: inline-block;
+  margin: 7px 0 0 10px;
+
+  @media(max-width: $screen-sm-max) {
+    display: block;
+    width: 100%;
+    margin: 20px 0;
+  }
+
+  button {
+    margin: -4px 0 0 15px;
+  }
+}
diff --git a/app/views/projects/blob/_editor.html.haml b/app/views/projects/blob/_editor.html.haml
index e7adef5558a..4b344b2edb9 100644
--- a/app/views/projects/blob/_editor.html.haml
+++ b/app/views/projects/blob/_editor.html.haml
@@ -1,29 +1,23 @@
+- action = current_action?(:edit) || current_action?(:update) ? 'edit' : 'create'
+
 .file-holder.file.append-bottom-default
-  .js-file-title.file-title.clearfix
+  .js-file-title.file-title.clearfix{ data: { current_action: action } }
     .editor-ref
       = icon('code-fork')
       = ref
     %span.editor-file-name
       - if current_action?(:edit) || current_action?(:update)
         = text_field_tag 'file_path', (params[:file_path] || @path),
-                                      class: 'form-control new-file-path'
+                                      class: 'form-control new-file-path js-file-path-name-input'
 
     - if current_action?(:new) || current_action?(:create)
       %span.editor-file-name
         \/
       = text_field_tag 'file_name', params[:file_name], placeholder: "File name",
-        required: true, class: 'form-control new-file-name'
+        required: true, class: 'form-control new-file-name js-file-path-name-input'
 
     .pull-right.file-buttons
-      .license-selector.js-license-selector-wrap.hidden
-        = dropdown_tag("Choose a License template", options: { toggle_class: 'btn js-license-selector', title: "Choose a license", filter: true, placeholder: "Filter", data: { data: licenses_for_select, project: @project.name, fullname: @project.namespace.human_name } } )
-      .gitignore-selector.js-gitignore-selector-wrap.hidden
-        = dropdown_tag("Choose a .gitignore template", options: { toggle_class: 'btn js-gitignore-selector', title: "Choose a template", filter: true, placeholder: "Filter", data: { data: gitignore_names } } )
-      .gitlab-ci-yml-selector.js-gitlab-ci-yml-selector-wrap.hidden
-        = dropdown_tag("Choose a GitLab CI Yaml template", options: { toggle_class: 'btn js-gitlab-ci-yml-selector', title: "Choose a template", filter: true, placeholder: "Filter", data: { data: gitlab_ci_ymls } } )
-      .dockerfile-selector.js-dockerfile-selector-wrap.hidden
-        = dropdown_tag("Choose a Dockerfile template", options: { toggle_class: 'btn js-dockerfile-selector', title: "Choose a template", filter: true, placeholder: "Filter", data: { data: dockerfile_names } } )
-      = button_tag class: 'soft-wrap-toggle btn', type: 'button' do
+      = button_tag class: 'soft-wrap-toggle btn', type: 'button', tabindex: '-1' do
         %span.no-wrap
           = custom_icon('icon_no_wrap')
           No wrap
@@ -31,7 +25,7 @@
           = custom_icon('icon_soft_wrap')
           Soft wrap
       .encoding-selector
-        = select_tag :encoding, options_for_select([ "base64", "text" ], "text"), class: 'select2'
+        = select_tag :encoding, options_for_select([ "base64", "text" ], "text"), class: 'select2', tabindex: '-1'
 
   .file-editor.code
     %pre.js-edit-mode-pane#editor= params[:content] || local_assigns[:blob_data]
diff --git a/app/views/projects/blob/_template_selectors.html.haml b/app/views/projects/blob/_template_selectors.html.haml
new file mode 100644
index 00000000000..d52733d2bd6
--- /dev/null
+++ b/app/views/projects/blob/_template_selectors.html.haml
@@ -0,0 +1,17 @@
+.template-selectors-menu
+  .templates-selectors-label
+    Template
+  .template-selector-dropdowns-wrap
+    .template-type-selector.js-template-type-selector-wrap.hidden
+      = dropdown_tag("Choose type", options: { toggle_class: 'btn js-template-type-selector', title: "Choose a template type" } )
+    .license-selector.js-license-selector-wrap.js-template-selector-wrap.hidden
+      = dropdown_tag("Apply a License template", options: { toggle_class: 'btn js-license-selector', title: "Apply a license", filter: true, placeholder: "Filter", data: { data: licenses_for_select, project: @project.name, fullname: @project.namespace.human_name } } )
+    .gitignore-selector.js-gitignore-selector-wrap.js-template-selector-wrap.hidden
+      = dropdown_tag("Apply a .gitignore template", options: { toggle_class: 'btn js-gitignore-selector', title: "Apply a template", filter: true, placeholder: "Filter", data: { data: gitignore_names } } )
+    .gitlab-ci-yml-selector.js-gitlab-ci-yml-selector-wrap.js-template-selector-wrap.hidden
+      = dropdown_tag("Apply a GitLab CI Yaml template", options: { toggle_class: 'btn js-gitlab-ci-yml-selector', title: "Apply a template", filter: true, placeholder: "Filter", data: { data: gitlab_ci_ymls } } )
+    .dockerfile-selector.js-dockerfile-selector-wrap.js-template-selector-wrap.hidden
+      = dropdown_tag("Apply a Dockerfile template", options: { toggle_class: 'btn js-dockerfile-selector', title: "Apply a template", filter: true, placeholder: "Filter", data: { data: dockerfile_names } } )
+  .template-selectors-undo-menu.hidden
+    %span.text-info Template applied
+    %button.btn.btn-sm.btn-info Undo
diff --git a/app/views/projects/blob/edit.html.haml b/app/views/projects/blob/edit.html.haml
index afe0b5dba45..4b26f944733 100644
--- a/app/views/projects/blob/edit.html.haml
+++ b/app/views/projects/blob/edit.html.haml
@@ -11,12 +11,15 @@
       Someone edited the file the same time you did. Please check out
       = link_to "the file", namespace_project_blob_path(@project.namespace, @project, tree_join(@target_branch, @file_path)), target: "_blank", rel: 'noopener noreferrer'
       and make sure your changes will not unintentionally remove theirs.
-
+  .editor-title-row
+    %h3.page-title.blob-edit-page-title
+      Edit file
+    = render 'template_selectors'
   .file-editor
     %ul.nav-links.no-bottom.js-edit-mode
       %li.active
         = link_to '#editor' do
-          Edit File
+          Write
 
       %li
         = link_to '#preview', 'data-preview-url' => namespace_project_preview_blob_path(@project.namespace, @project, @id) do
diff --git a/app/views/projects/blob/new.html.haml b/app/views/projects/blob/new.html.haml
index 4c449e040ee..2afb909572a 100644
--- a/app/views/projects/blob/new.html.haml
+++ b/app/views/projects/blob/new.html.haml
@@ -2,10 +2,10 @@
 - content_for :page_specific_javascripts do
   = page_specific_javascript_tag('lib/ace.js')
   = page_specific_javascript_bundle_tag('blob')
-
-%h3.page-title
-  New File
-
+.editor-title-row
+  %h3.page-title.blob-new-page-title
+    New file
+  = render 'template_selectors'
 .file-editor
   = form_tag(namespace_project_create_blob_path(@project.namespace, @project, @id), method: :post, class: 'form-horizontal js-edit-blob-form js-new-blob-form js-quick-submit js-requires-input', data: blob_editor_paths) do
     = render 'projects/blob/editor', ref: @ref
diff --git a/changelogs/unreleased/25332-make-file-templates-easy-to-use-and-discover.yml b/changelogs/unreleased/25332-make-file-templates-easy-to-use-and-discover.yml
new file mode 100644
index 00000000000..fc95858f783
--- /dev/null
+++ b/changelogs/unreleased/25332-make-file-templates-easy-to-use-and-discover.yml
@@ -0,0 +1,4 @@
+---
+title: Remove no-new annotation from file_template_mediator.js.
+merge_request: !9782
+author:
diff --git a/spec/features/auto_deploy_spec.rb b/spec/features/auto_deploy_spec.rb
index ea7a97d1d4f..009e9c6b04c 100644
--- a/spec/features/auto_deploy_spec.rb
+++ b/spec/features/auto_deploy_spec.rb
@@ -42,7 +42,7 @@ describe 'Auto deploy' do
 
     it 'includes OpenShift as an available template', js: true do
       click_link 'Set up auto deploy'
-      click_button 'Choose a GitLab CI Yaml template'
+      click_button 'Apply a GitLab CI Yaml template'
 
       within '.gitlab-ci-yml-selector' do
         expect(page).to have_content('OpenShift')
@@ -51,7 +51,7 @@ describe 'Auto deploy' do
 
     it 'creates a merge request using "auto-deploy" branch', js: true do
       click_link 'Set up auto deploy'
-      click_button 'Choose a GitLab CI Yaml template'
+      click_button 'Apply a GitLab CI Yaml template'
       within '.gitlab-ci-yml-selector' do
         click_on 'OpenShift'
       end
diff --git a/spec/features/projects/blobs/user_create_spec.rb b/spec/features/projects/blobs/user_create_spec.rb
index 5686868a0c4..d214a531138 100644
--- a/spec/features/projects/blobs/user_create_spec.rb
+++ b/spec/features/projects/blobs/user_create_spec.rb
@@ -88,7 +88,7 @@ feature 'New blob creation', feature: true, js: true do
 
     scenario 'shows error message' do
       expect(page).to have_content('Your changes could not be committed because a file with the same name already exists')
-      expect(page).to have_content('New File')
+      expect(page).to have_content('New file')
       expect(page).to have_content('NextFeature')
     end
   end
diff --git a/spec/features/projects/files/project_owner_creates_license_file_spec.rb b/spec/features/projects/files/project_owner_creates_license_file_spec.rb
index ccadc936567..6b281e6d21d 100644
--- a/spec/features/projects/files/project_owner_creates_license_file_spec.rb
+++ b/spec/features/projects/files/project_owner_creates_license_file_spec.rb
@@ -40,7 +40,7 @@ feature 'project owner creates a license file', feature: true, js: true do
   scenario 'project master creates a license file from the "Add license" link' do
     click_link 'Add License'
 
-    expect(page).to have_content('New File')
+    expect(page).to have_content('New file')
     expect(current_path).to eq(
       namespace_project_new_blob_path(project.namespace, project, 'master'))
     expect(find('#file_name').value).to eq('LICENSE')
@@ -63,7 +63,7 @@ feature 'project owner creates a license file', feature: true, js: true do
 
   def select_template(template)
     page.within('.js-license-selector-wrap') do
-      click_button 'Choose a License template'
+      click_button 'Apply a License template'
       click_link template
       wait_for_ajax
     end
diff --git a/spec/features/projects/files/project_owner_sees_link_to_create_license_file_in_empty_project_spec.rb b/spec/features/projects/files/project_owner_sees_link_to_create_license_file_in_empty_project_spec.rb
index 420db962318..87322ac2584 100644
--- a/spec/features/projects/files/project_owner_sees_link_to_create_license_file_in_empty_project_spec.rb
+++ b/spec/features/projects/files/project_owner_sees_link_to_create_license_file_in_empty_project_spec.rb
@@ -14,7 +14,7 @@ feature 'project owner sees a link to create a license file in empty project', f
     visit namespace_project_path(project.namespace, project)
     click_link 'Create empty bare repository'
     click_on 'LICENSE'
-    expect(page).to have_content('New File')
+    expect(page).to have_content('New file')
 
     expect(current_path).to eq(
       namespace_project_new_blob_path(project.namespace, project, 'master'))
@@ -40,7 +40,7 @@ feature 'project owner sees a link to create a license file in empty project', f
 
   def select_template(template)
     page.within('.js-license-selector-wrap') do
-      click_button 'Choose a License template'
+      click_button 'Apply a License template'
       click_link template
       wait_for_ajax
     end
diff --git a/spec/features/projects/files/template_type_dropdown_spec.rb b/spec/features/projects/files/template_type_dropdown_spec.rb
new file mode 100644
index 00000000000..5ee5e5b4c4e
--- /dev/null
+++ b/spec/features/projects/files/template_type_dropdown_spec.rb
@@ -0,0 +1,135 @@
+require 'spec_helper'
+
+feature 'Template type dropdown selector', js: true do
+  let(:project) { create(:project) }
+  let(:user) { create(:user) }
+
+  before do
+    project.team << [user, :master]
+    login_as user
+  end
+
+  context 'editing a non-matching file' do
+    before do
+      create_and_edit_file('.random-file.js')
+    end
+
+    scenario 'not displayed' do
+      check_type_selector_display(false)
+    end
+
+    scenario 'selects every template type correctly' do
+      fill_in 'file_path', with: '.gitignore'
+      try_selecting_all_types
+    end
+
+    scenario 'updates toggle value when input matches' do
+      fill_in 'file_path', with: '.gitignore'
+      check_type_selector_toggle_text('.gitignore')
+    end
+  end
+
+  context 'editing a matching file' do
+    before do
+      visit namespace_project_edit_blob_path(project.namespace, project, File.join(project.default_branch, 'LICENSE'))
+    end
+
+    scenario 'displayed' do
+      check_type_selector_display(true)
+    end
+
+    scenario 'is displayed when input matches' do
+      check_type_selector_display(true)
+    end
+
+    scenario 'selects every template type correctly' do
+      try_selecting_all_types
+    end
+
+    context 'user previews changes' do
+      before do
+        click_link 'Preview Changes'
+      end
+
+      scenario 'type selector is hidden and shown correctly' do
+        check_type_selector_display(false)
+        click_link 'Write'
+        check_type_selector_display(true)
+      end
+    end
+  end
+
+  context 'creating a matching file' do
+    before do
+      visit namespace_project_new_blob_path(project.namespace, project, 'master', file_name: '.gitignore')
+    end
+
+    scenario 'is displayed' do
+      check_type_selector_display(true)
+    end
+
+    scenario 'toggle is set to the correct value' do
+      check_type_selector_toggle_text('.gitignore')
+    end
+
+    scenario 'selects every template type correctly' do
+      try_selecting_all_types
+    end
+  end
+
+  context 'creating a file' do
+    before do
+      visit namespace_project_new_blob_path(project.namespace, project, project.default_branch)
+    end
+
+    scenario 'type selector is shown' do
+      check_type_selector_display(true)
+    end
+
+    scenario 'toggle is set to the proper value' do
+      check_type_selector_toggle_text('Choose type')
+    end
+
+    scenario 'selects every template type correctly' do
+      try_selecting_all_types
+    end
+  end
+end
+
+def check_type_selector_display(is_visible)
+  count = is_visible ? 1 : 0
+  expect(page).to have_css('.js-template-type-selector', count: count)
+end
+
+def try_selecting_all_types
+  try_selecting_template_type('LICENSE', 'Apply a License template')
+  try_selecting_template_type('Dockerfile', 'Apply a Dockerfile template')
+  try_selecting_template_type('.gitlab-ci.yml', 'Apply a GitLab CI Yaml template')
+  try_selecting_template_type('.gitignore', 'Apply a .gitignore template')
+end
+
+def try_selecting_template_type(template_type, selector_label)
+  select_template_type(template_type)
+  check_template_selector_display(selector_label)
+  check_type_selector_toggle_text(template_type)
+end
+
+def select_template_type(template_type)
+  find('.js-template-type-selector').click
+  find('.dropdown-content li', text: template_type).click
+end
+
+def check_template_selector_display(content)
+  expect(page).to have_content(content)
+end
+
+def check_type_selector_toggle_text(template_type)
+  dropdown_toggle_button = find('.template-type-selector .dropdown-toggle-text')
+  expect(dropdown_toggle_button).to have_content(template_type)
+end
+
+def create_and_edit_file(file_name)
+  visit namespace_project_new_blob_path(project.namespace, project, 'master', file_name: file_name)
+  click_button "Commit Changes"
+  visit namespace_project_edit_blob_path(project.namespace, project, File.join(project.default_branch, file_name))
+end
diff --git a/spec/features/projects/files/undo_template_spec.rb b/spec/features/projects/files/undo_template_spec.rb
new file mode 100644
index 00000000000..5479ea34610
--- /dev/null
+++ b/spec/features/projects/files/undo_template_spec.rb
@@ -0,0 +1,67 @@
+require 'spec_helper'
+include WaitForAjax
+
+feature 'Template Undo Button', js: true do 
+  let(:project) { create(:project) }
+  let(:user) { create(:user) }
+
+  before do
+    project.team << [user, :master]
+    login_as user  
+  end
+  
+  context 'editing a matching file and applying a template' do 
+    before do
+      visit namespace_project_edit_blob_path(project.namespace, project, File.join(project.default_branch, "LICENSE"))      
+      select_file_template('.js-license-selector', 'Apache License 2.0')
+    end
+    
+    scenario 'reverts template application' do
+      try_template_undo('http://www.apache.org/licenses/', 'Apply a License template')
+    end
+  end
+  
+  context 'creating a non-matching file' do 
+    before do
+      visit namespace_project_new_blob_path(project.namespace, project, 'master')
+      select_file_template_type('LICENSE')
+      select_file_template('.js-license-selector', 'Apache License 2.0')
+    end
+
+    scenario 'reverts template application' do
+      try_template_undo('http://www.apache.org/licenses/', 'Apply a License template')
+    end
+  end
+end
+
+def try_template_undo(template_content, toggle_text)
+  check_undo_button_display
+  check_content_reverted(template_content)
+  check_toggle_text_set(toggle_text)
+end
+
+def check_toggle_text_set(neutral_toggle_text)
+  expect(page).to have_content(neutral_toggle_text)
+end
+
+def check_undo_button_display
+  expect(page).to have_content('Template applied')
+  expect(page).to have_css('.template-selectors-undo-menu .btn-info')
+end
+
+def check_content_reverted(template_content)
+  find('.template-selectors-undo-menu .btn-info').click
+  expect(page).not_to have_content(template_content)
+  expect(find('.template-type-selector .dropdown-toggle-text')).to have_content()
+end
+
+def select_file_template(template_selector_selector, template_name)
+  find(template_selector_selector).click
+  find('.dropdown-content li', text: template_name).click
+  wait_for_ajax
+end
+
+def select_file_template_type(template_type)
+  find('.js-template-type-selector').click
+  find('.dropdown-content li', text: template_type).click
+end