Improve Code style (#11)

* Fix code style issues, add phpcs.xml

* Add parameter types in documentation, remove unnecessary commas in JS

* Add .travis.yml

* Add nonce check for form

* Update CHANGELOG, set license to GPLv3 only

Author: patrickrobrecht

.gitignore

@@ -1,3 +1 @@
-*.mo
-*.po
-*.pot
+/vendor/

.travis.yml

@@ -0,0 +1,21 @@
+language: php
+
+php:
+  - '5.6'
+  - '7.0'
+  - '7.1'
+  - '7.2'
+  - nightly
+
+matrix:
+  allow_failures:
+    - php: nightly
+
+before_script:
+  - composer install
+
+script:
+  - composer build
+
+notifications:
+  email: false

CHANGELOG.md

@@ -1,24 +1,40 @@
 # Posts and Users Stats - Changelog
+All notable changes to this WordPress plugin will be documented in this file.
 
-## Version 1.x
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-### Version 1.0
+## Unreleased
+
+### Changed
+* Code compliant to WordPress Coding Standards, ensured via Travis build
+
+
+## Version 1.0
+
+## Added
 * comments per date
 * comments per author
 * comments per status
 * consistent formatting of the source code
 
 
-## Version 0.x
+## Version 0.3
 
-### Version 0.3
+### Changed
 * improved styles and readme.txt documentation
 
-### Version 0.2
+
+## Version 0.2
+
+### Added
 * CSV export for all table data (client-side via JavaScript)
 * posts per publication date: selection of one post type possible
 
-### Version 0.1
+
+## Version 0.1
+
+### Added
 * posts per publication date
 * posts per taxonomies, i. e. per category, per tag and per custom taxonomy
 * posts per author and post type

composer.json

@@ -0,0 +1,45 @@
+{
+  "name": "patrickrobrecht/posts-and-users-stats",
+  "description": "A WordPress plugin for statistics on posts, comments and users",
+  "license": "GPL-3.0-only",
+  "type": "wordpress-plugin",
+  "authors": [
+    {
+      "name": "Patrick Robrecht",
+      "homepage": "https://patrick-robrecht.de/",
+      "role": "Developer"
+    }
+  ],
+  "support": {
+    "issues": "https://github.com/patrickrobrecht/posts-and-users-stats/issues",
+    "source": "https://github.com/patrickrobrecht/posts-and-users-stats"
+  },
+  "require": {
+    "php": "^5.6|^7"
+  },
+  "require-dev": {
+    "dealerdirect/phpcodesniffer-composer-installer": "^0.4",
+    "matthiasmullie/minify": "^1.3",
+    "slowprog/composer-copy-file": "^0.2",
+    "squizlabs/php_codesniffer": "^3.1",
+    "wimg/php-compatibility": "^8.0",
+    "wp-coding-standards/wpcs": "^0.14"
+  },
+  "scripts": {
+    "post-install-cmd": [
+      "@build"
+    ],
+    "post-update-cmd": [
+      "@build"
+    ],
+    "build": [
+      "@cs"
+    ],
+    "cs": [
+      "phpcs --standard=phpcs.xml -s"
+    ],
+    "csfix": [
+      "phpcbf --standard=phpcs.xml"
+    ]
+  }
+}