Refactors the whole task

This refactors the whole task by applying the DRY paradigma. Also it
removes the override of options through the command line because of
possible conflicts with custom options and those from other tasks.

tasks/phpcs.js

@@ -1,6 +1,6 @@
 /*
- * grunt-phpunit
- * https://github.com/SaschaGalley/grunt-phpunit
+ * grunt-phpcs
+ * https://github.com/SaschaGalley/grunt-phpcs
  *
  * Copyright (c) 2013 Sascha Galley
  * http://xash.at
@@ -10,11 +10,66 @@
 
 module.exports = function(grunt) {
 
-    // Internal lib.
-    var phpcs = require('./lib/phpcs').init(grunt);
+    var path = require('path'),
+        exec = require('child_process').exec;
+
+    var command = {
+            flags: {
+                verbose: 'v',
+                showSniffCodes: 's'
+            },
+            options: {
+                errorSeverity: 'error-severity',
+                extensions: 'extensions',
+                ignore: 'ignore',
+                report: 'report',
+                reportFile: 'report-file',
+                severity: 'severity',
+                standard: 'standard',
+                warningSeverity: 'warning-severity',
+                tabWidth: 'tab-width'
+            }
+        },
+        defaults = {
+            bin: 'phpcs',
+            report: 'full',
+            maxBuffer: 200*1024
+        },
+        done = null;
 
-    grunt.registerMultiTask('phpcs', 'Run phpunit', function() {
-        phpcs.setup(this);
-        phpcs.run();
+    grunt.registerMultiTask('phpcs', 'Run PHP Code Sniffer', function() {
+        var done = null,
+        options = this.options(defaults),
+        execute = path.normalize(options.bin),
+        files = [].concat.apply([], this.files.map(function(mapping) { return mapping.src; })).sort();
+
+        for (var flag in command.flags) {
+            if (options[flag] === true) {
+                execute += ' -' + command.flags[flag];
+            }
+        }
+
+        for (var option in command.options) {
+            if (options[option] !== undefined) {
+                execute += ' --' + command.options[option] + '=' + options[option];
+            }
+        }
+
+        files = files.filter(function(file, position) { return !position || file !== files[position - 1]; });
+
+        execute += ' ' + '"' + files.join('" "') + '"';
+
+        grunt.log.writeln('Checking ' + files.length + ' file' + (files.length === 1 ? '' : 's') + '...');
+        grunt.verbose.writeln('Executing: ' + execute);
+
+        done = this.async();
+
+        exec(execute, {maxBuffer: options.maxBuffer}, function(err, stdout, stderr) {
+            /* jshint -W030 */
+            typeof config.callback === 'function' && config.callback.call(this, err, stdout, stderr, done);
+            stdout && grunt.log.write(stdout);
+            err && !options.ignoreExitCode && grunt.fatal(err);
+            done();
+        });
     });
 };