scripts: Improve usage

* Add fix script
* Split install-dependencies script for parity with other scripts
* Install PHP tools using Composer, running utils/install-phars.sh not necessary any more (We did not do that in the past to avoid clashes between our and their dependencies but this does not seem to be an issue at the moment.) Ideally, composer would fix that on their end: composer/composer#5390
* Use install-dependencies on CI as well
* COMPOSER_NO_INTERACTION is now set on CI, instead of manually passing it to every composer commands.

.travis.yml

@@ -13,6 +13,8 @@ matrix:
         - php: 5.6
           env: DEPLOY=true
     fast_finish: true
+env:
+    - COMPOSER_NO_INTERACTION=1
 
 addons:
     apt:
@@ -26,16 +28,12 @@ cache:
 
 before_install:
     - nvm install 12
-    - npm install
     - if [ -n "$GH_TOKEN" ]; then composer config github-oauth.github.com ${GH_TOKEN}; fi
-    - utils/install-phars.sh
-
-install:
     - composer self-update
 
-before_script:
+install:
     - phpenv config-rm xdebug.ini
-    - composer install --prefer-dist --no-interaction
+    - npm run install-dependencies
 
 script:
     - if [ "$LINT_JS" = true ]; then npm run lint:client; fi

README.md

@@ -75,7 +75,7 @@ We use [Parcel](https://parceljs.org/) (installed by the command above) to build
 
 If you want to create a package with all the dependencies bundled, you can run `npm run dist` command to produce a zipball.
 
-Every patch is expected to adhere to our coding style, which is checked automatically by Travis. You can install the checkers locally either with your package manager or by calling `utils/install-phars.sh`, and then run the checks using `npm run check` before submitting a pull request.
+Every patch is expected to adhere to our coding style, which is checked automatically by Travis. You can install the checkers locally using `npm run install-dependencies`, and then run the checks using `npm run check` before submitting a pull request. There is also `npm run fix`, that will attempt to fix the formatting.
 
 ## Credits
 

composer.json

@@ -22,6 +22,11 @@
         "willwashburn/phpamo": "^1.0",
         "ext-gd": "*"
     },
+    "require-dev": {
+        "jakub-onderka/php-console-highlighter": "^0.4.0",
+        "jakub-onderka/php-parallel-lint": "^1.0",
+        "friendsofphp/php-cs-fixer": "^2.15"
+    },
     "license": "GPL-3.0",
     "authors": [
         {
@@ -51,6 +56,6 @@
     "scripts": {
         "cs": "php-cs-fixer fix --verbose --dry-run --diff",
         "fix": "php-cs-fixer fix --verbose --diff",
-        "lint": "php-parallel-lint src"
+        "lint": "parallel-lint src"
     }
 }