Add plugin dependencies support with --with-dependencies flag and install-dependencies command

composer.json

@@ -49,6 +49,7 @@
             "plugin delete",
             "plugin get",
             "plugin install",
+            "plugin install-dependencies",
             "plugin is-installed",
             "plugin list",
             "plugin path",

features/plugin-dependencies.feature

@@ -0,0 +1,193 @@
+Feature: Plugin dependencies support
+
+  Background:
+    Given an empty cache
+
+  @less-than-wp-6.5
+  Scenario: Install plugin with dependencies using --with-dependencies flag
+    Given a WP install
+
+    When I try `wp plugin install --with-dependencies bp-classic`
+    Then STDERR should contain:
+      """
+      Installing plugins with dependencies requires WordPress 6.5 or greater.
+      """
+
+  @require-wp-6.5
+  Scenario: Install plugin with dependencies using --with-dependencies flag
+    Given a WP install
+
+    When I run `wp plugin install --with-dependencies bp-classic`
+    Then STDOUT should contain:
+      """
+      Installing BuddyPress
+      """
+    And STDOUT should contain:
+      """
+      Installing BP Classic
+      """
+    And STDOUT should contain:
+      """
+      Success: Installed 2 of 2 plugins.
+      """
+
+    When I run `wp plugin list --fields=name,status --format=csv`
+    Then STDOUT should contain:
+      """
+      buddypress,inactive
+      """
+    And STDOUT should contain:
+      """
+      bp-classic,inactive
+      """
+
+  @less-than-wp-6.5
+  Scenario: Install dependencies of an installed plugin
+    Given a WP install
+
+    When I try `wp plugin install-dependencies akismet`
+    Then STDERR should contain:
+      """
+      Installing plugin dependencies requires WordPress 6.5 or greater.
+      """
+
+  @require-wp-6.5
+  Scenario: Install dependencies of an installed plugin
+    Given a WP install
+
+    # Create a test plugin with dependencies
+    And a wp-content/plugins/test-plugin/test-plugin.php file:
+      """
+      <?php
+      /**
+       * Plugin Name: Test Plugin
+       * Requires Plugins: duplicate-post, debug-bar
+       */
+      """
+
+    When I run `wp plugin install-dependencies test-plugin`
+    Then STDOUT should contain:
+      """
+      Installing 2 dependencies for 'test-plugin'
+      """
+    And STDOUT should contain:
+      """
+      Success:
+      """
+
+    When I run `wp plugin list --name=akismet --field=status`
+    Then STDOUT should be:
+      """
+      inactive
+      """
+
+    When I run `wp plugin list --name=hello --field=status`
+    Then STDOUT should be:
+      """
+      inactive
+      """
+
+  @require-wp-6.5
+  Scenario: Install dependencies with activation
+    Given a WP install
+
+    # Create a test plugin with dependencies
+    And a wp-content/plugins/test-plugin/test-plugin.php file:
+      """
+      <?php
+      /**
+       * Plugin Name: Test Plugin
+       * Requires Plugins: akismet, buddypress
+       */
+      """
+
+    When I try `wp plugin install-dependencies test-plugin --activate`
+    Then STDOUT should contain:
+      """
+      Installing 2 dependencies for 'test-plugin'
+      """
+    And STDOUT should contain:
+      """
+      Plugin 'buddypress' activated
+      """
+    And STDOUT should contain:
+      """
+      Success: Installed 1 of 2 plugins.
+      """
+    And STDERR should contain:
+      """
+      Warning: akismet: Plugin already installed.
+      """
+
+    When I run `wp plugin list --fields=name,status --format=csv`
+    Then STDOUT should contain:
+      """
+      buddypress,active
+      """
+    And STDOUT should contain:
+      """
+      akismet,active
+      """
+    # Only the dependencies are activated, not the plugin itself.
+    And STDOUT should contain:
+      """
+      test-plugin,inactive
+      """
+
+  @require-wp-6.5
+  Scenario: Force install dependencies
+    Given a WP install
+
+    # Create a test plugin with dependencies
+    And a wp-content/plugins/test-plugin/test-plugin.php file:
+      """
+      <?php
+      /**
+       * Plugin Name: Test Plugin
+       * Requires Plugins: akismet
+       */
+      """
+
+    When I run `wp plugin install-dependencies test-plugin --force`
+    Then STDOUT should contain:
+      """
+      Installing 1 dependency for 'test-plugin'
+      """
+    And STDOUT should contain:
+      """
+      Installing Akismet
+      """
+    And STDOUT should contain:
+      """
+      Success: Installed 1 of 1 plugins.
+      """
+    And STDERR should be empty
+
+  @require-wp-6.5
+  Scenario: Install plugin with no dependencies
+    Given a WP install
+
+    And a wp-content/plugins/test-plugin/test-plugin.php file:
+      """
+      <?php
+      /**
+       * Plugin Name: Test Plugin No Deps
+       */
+      """
+
+    When I run `wp plugin install-dependencies test-plugin`
+    Then STDOUT should contain:
+      """
+      Success: Plugin 'test-plugin' has no dependencies.
+      """
+
+  @require-wp-6.5
+  Scenario: Error when installing dependencies of non-existent plugin
+    Given a WP install
+
+    When I try `wp plugin install-dependencies non-existent-plugin`
+    Then STDERR should contain:
+      """
+      Error: The 'non-existent-plugin' plugin could not be found.
+      """
+    And the return code should be 1