Install phpcs using Composer

.editorconfig

@@ -8,7 +8,7 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[{package.json,.travis.yml}]
+[{*.json,*.yml}]
 indent_style = space
 indent_size = 2
 

.travis.yml

@@ -44,8 +44,7 @@ before_script:
     fi
   - |
     if [[ "$TRAVISCI" == "phpcs" ]] ; then
-      composer global require wp-coding-standards/wpcs
-      phpcs --config-set installed_paths $HOME/.composer/vendor/wp-coding-standards/wpcs
+      composer install
     fi
 
 script:
@@ -58,7 +57,7 @@ script:
     fi
   - |
     if [[ "$TRAVISCI" == "phpcs" ]] ; then
-      phpcs
+      ./vendor/bin/phpcs
     fi
   - |
     if [[ "$TRAVISCI" == "js" ]] ; then

composer.json

@@ -0,0 +1,11 @@
+{
+  "require-dev": {
+    "squizlabs/php_codesniffer": "2.9.x",
+    "wp-coding-standards/wpcs": "^0.11.0"
+  },
+  "scripts": {
+    "post-install-cmd": [
+      "phpcs --config-set installed_paths ../../wp-coding-standards/wpcs/"
+    ]
+  }
+}

docs/coding-guidelines.md

@@ -92,28 +92,7 @@ When making any changes to the PHP code in this project, it's recommended to
 install and run `phpcs` on your computer.  This is a step in our Travis CI
 build as well, but it is better to catch errors locally.
 
-You will need to install `phpcs` version 2.9.x, because the 3.x versions are
-not yet compatible with the WordPress coding standards.  For more information see
-[this issue](https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/issues/718).
-
-The easiest way to get `phpcs` is to download the .phar archive from the latest
-2.9.x release on GitHub:
-[PHP\_CodeSniffer releases](https://github.com/squizlabs/PHP_CodeSniffer/releases).
-
-For example:
-
-```sh
-wget \
-    https://github.com/squizlabs/PHP_CodeSniffer/releases/download/2.9.1/phpcs.phar \
-    -O ~/bin/phpcs
-chmod +x ~/bin/phpcs
-```
-
-(If `~/bin` is not in your `$PATH`, pick another directory that is.)
-
-Then you must install the `WordPress-Coding-Standards` repository and tell
-`phpcs` where it lives.  See instructions here:
-
-https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards#standalone
-
-You should now be able to run `phpcs` from the root directory of this project.
+The easiest way to do this is using `composer`.
+[Install `composer`](https://getcomposer.org/download/)
+on your computer, then run `composer install`.  This will install `phpcs` and
+`WordPress-Coding-Standards` which you can the run via `vendor/bin/phpcs`.

vendor/.gitignore

@@ -1 +1,2 @@
-*.js
+*
+!.gitignore