Remove the "Projects" repo tab when there are no projects (#411)

extension/content.css

@@ -585,3 +585,8 @@ div.inline-comment-form .form-actions,
 .inline-comment-form .form-actions .js-hide-inline-comment-form {
 	float: none;
 }
+
+/* "Add a Project" button */
+#refined-github-project-new-link {
+	margin-top: 5px;
+}

extension/content.js

@@ -344,6 +344,20 @@ function addFilterCommentsByYou() {
 	}
 }
 
+function addProjectNewLink() {
+	const projectNewLink = `<a href="/${repoUrl}/projects/new" class="btn btn-sm" id="refined-github-project-new-link">Add a project</a>`;
+	if ($('#projects-feature:checked').length > 0 && $('#refined-github-project-new-link').length === 0) {
+		$(`#projects-feature ~ p.note`).after(projectNewLink);
+	}
+}
+
+function removeProjectsTab() {
+	const projectsTab = $('.js-repo-nav').find('.reponav-item[data-selected-links^="repo_projects"]');
+	if (projectsTab.length > 0 && projectsTab.find('.Counter').text() === '0') {
+		projectsTab.remove();
+	}
+}
+
 // Support indent with tab key in comments
 $(document).on('keydown', '.js-comment-field', event => {
 	if (event.which === 9 && !event.shiftKey) {
@@ -414,6 +428,7 @@ document.addEventListener('DOMContentLoaded', () => {
 	if (pageDetect.isRepo()) {
 		gitHubInjection(window, () => {
 			addReleasesTab();
+			removeProjectsTab();
 			diffFileHeader.destroy();
 			enableCopyOnY.destroy();
 			markUnread.destroy();
@@ -489,6 +504,10 @@ document.addEventListener('DOMContentLoaded', () => {
 			if (pageDetect.hasCode()) {
 				linkifyURLsInCode.linkifyCode(repoUrl);
 			}
+
+			if (pageDetect.isRepoSettings()) {
+				addProjectNewLink();
+			}
 		});
 	}
 });

extension/page-detect.js

@@ -43,6 +43,8 @@ window.pageDetect = (() => {
 
 	const isNotifications = () => /\/notifications(\/participating)?/.test(location.pathname);
 
+	const isRepoSettings = () => isRepo() && /^\/settings/.test(getRepoPath());
+
 	const getOwnerAndRepo = () => {
 		const [, ownerName, repoName] = location.pathname.split('/');
 
@@ -81,6 +83,7 @@ window.pageDetect = (() => {
 		isBlame,
 		isNotifications,
 		getOwnerAndRepo,
-		isSingleFile
+		isSingleFile,
+		isRepoSettings
 	};
 })();

readme.md

@@ -43,6 +43,7 @@ Our hope is that GitHub will notice and implement some of these much needed impr
 - Removes annoying hover effect in the repo file browser
 - Removes the comment box toolbar
 - Removes tooltips
+- Removes the "Projects" repo tab when there are no projects
 - Copy canonical link to file when [the `y` hotkey](https://help.github.com/articles/getting-permanent-links-to-files/) is used
 - ~~[Adds blame links for parent commits in blame view](https://github.com/sindresorhus/refined-github/issues/2#issuecomment-189141373)~~ [Implemented by GitHub](https://github.com/blog/2304-navigate-file-history-faster-with-improved-blame-view)
 - ~~[Adds ability to collapse/expand files in a pull request diff](https://cloud.githubusercontent.com/assets/170270/13954167/40caa604-f072-11e5-89ba-3145217c4e28.png)~~ [Implemented by GitHub](https://cloud.githubusercontent.com/assets/170270/25772137/6a6b678e-3296-11e7-97c7-02e31ef17743.png)

test/page-detect.js

@@ -156,6 +156,13 @@ test('isSingleFile', urlMatcherMacro, pageDetect.isSingleFile, [
 	'https://github.com/sindresorhus/refined-github/commit/57bf4'
 ]);
 
+test('isRepoSettings', urlMatcherMacro, pageDetect.isRepoSettings, [
+	'https://github.com/sindresorhus/refined-github/settings',
+	'https://github.com/sindresorhus/refined-github/settings/branches'
+], [
+	'https://github.com/sindresorhus/refined-github/releases'
+]);
+
 test('getOwnerAndRepo', t => {
 	const ownerAndRepo = {
 		'https://github.com/sindresorhus/refined-github/pull/148': {