Add linting check to CI to help catch version-incompatible code

.travis.yml

@@ -11,6 +11,7 @@ php:
 
 script:
   - mkdir -p build/logs
+  - vendor/bin/robo lint
   - phpdbg -qrr -- vendor/bin/phpunit -c build
 
 after_script:

Jenkinsfile

@@ -13,6 +13,7 @@ pipeline {
  				sh 'curl -sS https://getcomposer.org/installer | php'
 				sh 'rm -f composer.lock'
  				sh 'php composer.phar install --ignore-platform-reqs'
+				sh 'php vendor/bin/robo lint'
  				sh 'phpdbg -qrr -- ./vendor/bin/phpunit --coverage-text --colors=never'
  			}
  		}
@@ -28,6 +29,7 @@ pipeline {
 				sh 'curl -sS https://getcomposer.org/installer | php'
 				sh 'rm -f composer.lock'
 				sh 'php composer.phar install --ignore-platform-reqs'
+				sh 'php vendor/bin/robo lint'
 				sh 'phpdbg -qrr -- ./vendor/bin/phpunit --coverage-text --colors=never'
 			}
 		}
@@ -43,6 +45,7 @@ pipeline {
 				sh 'curl -sS https://getcomposer.org/installer | php'
 				sh 'rm -f composer.lock'
 				sh 'php composer.phar install --ignore-platform-reqs'
+				sh 'php vendor/bin/robo lint'
 				sh 'phpdbg -qrr -- ./vendor/bin/phpunit --coverage-text --colors=never'
 			}
 		}

RoboFile.php

@@ -54,7 +54,7 @@ class RoboFile extends Tasks {
 	/**
 	 * Do static analysis tasks
 	 */
-	public function analyze()
+	public function analyze(): void
 	{
 		$this->prepare();
 		$this->lint();
@@ -67,7 +67,7 @@ class RoboFile extends Tasks {
 	/**
 	 * Run all tests, generate coverage, generate docs, generate code statistics
 	 */
-	public function build()
+	public function build(): void
 	{
 		$this->analyze();
 		$this->coverage();
@@ -77,19 +77,19 @@ class RoboFile extends Tasks {
 	/**
 	 * Cleanup temporary files
 	 */
-	public function clean()
+	public function clean(): void
 	{
 		$cleanFiles = [
 			'build/humbug.json',
 			'build/humbug-log.txt',
 		];
-		array_map(function ($file) {
+		array_map(static function ($file) {
 			@unlink($file);
 		}, $cleanFiles);
 
 		// So the task doesn't complain,
 		// make any 'missing' dirs to cleanup
-		array_map(function ($dir) {
+		array_map(static function ($dir) {
 			if ( ! is_dir($dir))
 			{
 				`mkdir -p {$dir}`;
@@ -103,7 +103,7 @@ class RoboFile extends Tasks {
 	/**
 	 * Run unit tests and generate coverage reports
 	 */
-	public function coverage()
+	public function coverage(): void
 	{
 		$this->_run(['phpdbg -qrr -- vendor/bin/phpunit -c build']);
 	}
@@ -111,7 +111,7 @@ class RoboFile extends Tasks {
 	/**
 	 * Generate documentation with phpdox
 	 */
-	public function docs()
+	public function docs(): void
 	{
 		$cmd_parts = [
 			'vendor/bin/phpdox',
@@ -122,7 +122,7 @@ class RoboFile extends Tasks {
 	/**
 	 * Verify that source files are valid
 	 */
-	public function lint()
+	public function lint(): void
 	{
 		$files = $this->getAllSourceFiles();
 
@@ -139,7 +139,7 @@ class RoboFile extends Tasks {
 	 *
 	 * @param bool $report - if true, generates reports instead of direct output
 	 */
-	public function phpcs($report = FALSE)
+	public function phpcs($report = FALSE): void
 	{
 		$report_cmd_parts = [
 			'vendor/bin/phpcs',
@@ -162,7 +162,7 @@ class RoboFile extends Tasks {
 	 *
 	 * @param bool $report - if true, generates reports instead of direct output
 	 */
-	public function phploc($report = FALSE)
+	public function phploc($report = FALSE): void
 	{
 		// Command for generating reports
 		$report_cmd_parts = [
@@ -190,7 +190,7 @@ class RoboFile extends Tasks {
 	/**
 	 * Create temporary directories
 	 */
-	public function prepare()
+	public function prepare(): void
 	{
 		array_map([$this, '_mkdir'], $this->taskDirs);
 	}
@@ -198,7 +198,7 @@ class RoboFile extends Tasks {
 	/**
 	 * Lint php files and run unit tests
 	 */
-	public function test()
+	public function test(): void
 	{
 		$this->lint();
 
@@ -208,7 +208,7 @@ class RoboFile extends Tasks {
 	/**
 	 * Create pdepend reports
 	 */
-	protected function dependencyReport()
+	protected function dependencyReport(): void
 	{
 		$cmd_parts = [
 			'vendor/bin/pdepend',
@@ -225,7 +225,7 @@ class RoboFile extends Tasks {
 	 *
 	 * @return array
 	 */
-	protected function getAllSourceFiles()
+	protected function getAllSourceFiles(): array
 	{
 		$files = array_merge(
 			glob_recursive('build/*.php'),
@@ -246,7 +246,7 @@ class RoboFile extends Tasks {
 	 *
 	 * @param array $chunk
 	 */
-	protected function parallelLint(array $chunk)
+	protected function parallelLint(array $chunk): void
 	{
 		$task = $this->taskParallelExec()
 			->timeout(5)
@@ -263,7 +263,7 @@ class RoboFile extends Tasks {
 	/**
 	 * Generate copy paste detector report
 	 */
-	protected function phpcpdReport()
+	protected function phpcpdReport(): void
 	{
 		$cmd_parts = [
 			'vendor/bin/phpcpd',
@@ -280,7 +280,7 @@ class RoboFile extends Tasks {
 	 * @param array $cmd_parts - command arguments
 	 * @param string $join_on - what to join the command arguments with
 	 */
-	protected function _run(array $cmd_parts, $join_on = ' ')
+	protected function _run(array $cmd_parts, $join_on = ' '): void
 	{
 		$this->taskExec(implode($join_on, $cmd_parts))->run();
 	}