Issue #3329110 by jcnventura: Support composer.libraries.json library installation method

.gitignore

+.idea

README.md

@@ -46,30 +46,50 @@ INSTALLATION
    contributed Drupal module. Visit https://www.drupal.org/node/1897420 for
    further information.
  * Install external library from xdan trough composer or manual. Library
-   should be available at yourdrupalsite.com/libraries/datetimepicker
+   should be available at example.com/libraries/jquery-datetimepicker
 
     1. Manual download.
+
        Download https://github.com/xdan/datetimepicker/archive/2.5.20.zip,
-       and extract inside drupal root folder: libraries/jquery-datetimepicker
+       and extract inside [webroot]/libraries/jquery-datetimepicker
 
     2. Using drupal-libraries-installer plugin.
+
        `composer require "zodiacmedia/drupal-libraries-installer":"^1.4.1"`
 
-       [Ensure composer packages of type drupal-library are configured to
-       install to the appropriate path.](https://www.drupal.org/docs/develop/using-composer/using-composer-to-install-drupal-and-manage-dependencies#installer-dirs)
-    ```
-    "extra": {
-        "drupal-libraries": {
-            "jquery-datetimepicker": "https://github.com/xdan/datetimepicker/archive/2.5.20.zip"
+       Add the following lines to your site's root composer.json:
+       ```
+       "extra": {
+         "drupal-libraries": {
+           "jquery-datetimepicker": "https://github.com/xdan/datetimepicker/archive/2.5.20.zip"
+         },
+       }
+       ```
+
+    3. Using wikimedia/composer-merge-plugin plugin.
+
+       `composer require "wikimedia/composer-merge-plugin":"^2.0"`
+
+       Add the following lines to your site's root composer.json:
+       ```
+       "extra": {
+         "merge-plugin": {
+           "include": [
+             "[web-root]/modules/contrib/single_datetime/composer.libraries.json"
+           ]
          },
-    }
-    ```
-    3. Using oomphinc/composer-installers-extender plugin and [Asset Packagist](https://asset-packagist.org/).
-       `composer require "oomphinc/composer-installers-extender":"^1.1 || ^2.0"`
-       `composer require "npm-asset/jquery-datetimepicker":"^2.5"`
-
-       [Ensure composer packages of type npm-asset are configured to install
-       to the appropriate path.](https://www.drupal.org/docs/develop/using-composer/using-composer-to-install-drupal-and-manage-dependencies#third-party-libraries)
+       }
+       ```
+
+    4. Using oomphinc/composer-installers-extender plugin and [Asset Packagist](https://asset-packagist.org/).
+       ```
+       composer require "oomphinc/composer-installers-extender":"^1.1 || ^2.0"
+       composer require "npm-asset/jquery-datetimepicker":"^2.5"
+       ```
+
+    [Ensure composer packages of type drupal-library (options 2 and 3) or
+    npm-asset (option 4) are configured to install to the appropriate path.
+    ](https://www.drupal.org/docs/develop/using-composer/using-composer-to-install-drupal-and-manage-dependencies#third-party-libraries)
 
 CONFIGURATION
 -------------

composer.libraries.json

+{
+  "name": "drupal/single_datetime",
+  "type": "drupal-module",
+  "description": "Date time picker form element using the xdan jQuery Plugin Date and Time Picker library",
+  "license": "GPL-2.0-or-later",
+  "homepage": "https://www.drupal.org/project/single_datetime",
+  "minimum-stability": "dev",
+  "support": {
+    "issues": "https://www.drupal.org/project/issues/single_datetime",
+    "source": "https://git.drupalcode.org/project/single_datetime"
+  },
+  "require": {
+    "xdan/datetimepicker": "*"
+  },
+  "repositories": {
+    "jquery-datetimepicker": {
+      "type": "package",
+      "package": {
+        "name": "xdan/datetimepicker",
+        "version": "2.5.20",
+        "type": "drupal-library",
+        "extra": {
+          "installer-name": "jquery-datetimepicker"
+        },
+        "dist": {
+          "url": "https://github.com/xdan/datetimepicker/archive/2.5.20.zip",
+          "type": "zip"
+        }
+      }
+    }
+  }
+}