Remove dependency on Sass

- Convert *.sass files to vanilla CSS
- Start using CSS variables
- Add PHP minifier

app/Console/CssCommand.php

@@ -0,0 +1,126 @@
+<?php
+
+namespace Kanboard\Console;
+
+use MatthiasMullie\Minify;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+$path = __DIR__ . '/../../libs';
+require_once $path . '/minify/src/Minify.php';
+require_once $path . '/minify/src/CSS.php';
+require_once $path . '/minify/src/JS.php';
+require_once $path . '/minify/src/Exception.php';
+require_once $path . '/minify/src/Exceptions/BasicException.php';
+require_once $path . '/minify/src/Exceptions/FileImportException.php';
+require_once $path . '/minify/src/Exceptions/IOException.php';
+require_once $path . '/path-converter/src/ConverterInterface.php';
+require_once $path . '/path-converter/src/Converter.php';
+
+/**
+ * Class CssCommand
+ *
+ * @package Kanboard\Console
+ * @author  Frederic Guillot
+ */
+class CssCommand extends BaseCommand
+{
+    const CSS_SRC_PATH = 'assets/css/src/';
+    const CSS_VENDOR_PATH = 'assets/vendor/';
+    const CSS_DIST_PATH = 'assets/css/';
+
+    private $appFiles = [
+        'variables.css',
+        'base.css',
+        'links.css',
+        'titles.css',
+        'table.css',
+        'table_drag_and_drop.css',
+        'table_list.css',
+        'form.css',
+        'input_addon.css',
+        'icon.css',
+        'alert.css',
+        'button.css',
+        'tooltip.css',
+        'dropdown.css',
+        'accordion.css',
+        'select_dropdown.css',
+        'suggest_menu.css',
+        'modal.css',
+        'pagination.css',
+        'header.css',
+        'logo.css',
+        'page_header.css',
+        'sidebar.css',
+        'avatar.css',
+        'file_upload.css',
+        'thumbnails.css',
+        'color_picker.css',
+        'filter_box.css',
+        'project.css',
+        'views.css',
+        'dashboard.css',
+        'board.css',
+        'task_board.css',
+        'task_icons.css',
+        'task_category.css',
+        'task_date.css',
+        'task_tags.css',
+        'task_summary.css',
+        'task_form.css',
+        'comment.css',
+        'subtasks.css',
+        'task_links.css',
+        'text_editor.css',
+        'markdown.css',
+        'panel.css',
+        'activity_stream.css',
+        'user_mention.css',
+        'slideshow.css',
+        'list_items.css',
+        'bulk_change.css',
+    ];
+
+    private $printFiles = [
+        'print.css',
+    ];
+
+    private $vendorFiles = [
+        'jquery-ui/jquery-ui.min.css',
+        'jqueryui-timepicker-addon/jquery-ui-timepicker-addon.min.css',
+        'select2/css/select2.min.css',
+        'font-awesome/css/font-awesome.min.css',
+        'c3/c3.min.css',
+    ];
+
+    protected function configure()
+    {
+        $this
+            ->setName('css')
+            ->setDescription('Minify CSS')
+        ;
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $this->minifyFiles(self::CSS_SRC_PATH, $this->appFiles, 'app.min.css');
+        $this->minifyFiles(self::CSS_SRC_PATH, $this->printFiles, 'print.min.css');
+        $this->minifyFiles(self::CSS_VENDOR_PATH, $this->vendorFiles, 'vendor.min.css');
+    }
+
+    private function minifyFiles($folder, array $files, $destination)
+    {
+        $minifier = new Minify\CSS();
+
+        foreach ($files as $file) {
+            $filename =  $folder. $file;
+            if (! file_exists($filename)) {
+                die("$filename not found\n");
+            }
+            $minifier->add($filename);
+        }
+
+        $minifier->minify(self::CSS_DIST_PATH . $destination);
+    }
+}

app/ServiceProvider/CommandProvider.php

@@ -24,6 +24,7 @@ use Kanboard\Console\TaskTriggerCommand;
 use Kanboard\Console\TransitionExportCommand;
 use Kanboard\Console\VersionCommand;
 use Kanboard\Console\WorkerCommand;
+use Kanboard\Console\CssCommand;
 use Pimple\Container;
 use Pimple\ServiceProviderInterface;
 use Symfony\Component\Console\Application;
@@ -67,6 +68,7 @@ class CommandProvider implements ServiceProviderInterface
         $application->add(new DatabaseMigrationCommand($container));
         $application->add(new DatabaseVersionCommand($container));
         $application->add(new VersionCommand($container));
+        $application->add(new CssCommand($container));
 
         $container['cli'] = $application;
         return $container;