From 72c2a6c9e74e54a01415f41e19a56242bd97784c Mon Sep 17 00:00:00 2001
From: Joost De Cock <joost@decock.org>
Date: Sat, 12 Sep 2020 19:01:12 +0200
Subject: [PATCH] feat(core): Added support for conditional plugins

---
 packages/core/src/design.js  | 11 +++++++++--
 packages/core/src/pattern.js | 17 +++++++++++++++++
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/packages/core/src/design.js b/packages/core/src/design.js
index 1194358dfce..ac037eade43 100644
--- a/packages/core/src/design.js
+++ b/packages/core/src/design.js
@@ -1,10 +1,17 @@
 import Pattern from './pattern'
 
-export default function Design(config, plugins = false) {
-  const pattern = function(settings) {
+export default function Design(config, plugins = false, conditionalPlugins = false) {
+  const pattern = function (settings) {
     Pattern.call(this, config)
+    // Load plugins
     if (Array.isArray(plugins)) for (let plugin of plugins) this.use(plugin)
     else if (plugins) this.use(plugins)
+    // Load conditional plugins
+    if (Array.isArray(conditionalPlugins))
+      for (let plugin of conditionalPlugins) this.useIf(plugin, settings)
+    else if (conditionalPlugins.plugin && conditionalPlugins.condition)
+      this.useIf(conditionalPlugins, settings)
+
     this.apply(settings)
 
     return this
diff --git a/packages/core/src/pattern.js b/packages/core/src/pattern.js
index 2575c579d47..d4ee1b3f976 100644
--- a/packages/core/src/pattern.js
+++ b/packages/core/src/pattern.js
@@ -397,6 +397,23 @@ Pattern.prototype.use = function (plugin, data) {
   return this
 }
 
+Pattern.prototype.useIf = function (plugin, settings) {
+  if (plugin.condition(settings)) {
+    if (this.debug)
+      this.raise.debug(
+        `Condition met: Loaded plugin \`${plugin.plugin.name}:${plugin.plugin.version}\``
+      )
+    this.loadPluginHooks(plugin.plugin, plugin.data)
+  } else {
+    if (this.debug)
+      this.raise.debug(
+        `Condition not met: Skipped loading plugin \`${plugin.plugin.name}:${plugin.plugin.version}\``
+      )
+  }
+
+  return this
+}
+
 Pattern.prototype.loadPluginHooks = function (plugin, data) {
   for (let hook of Object.keys(this.hooks)) {
     if (typeof plugin.hooks[hook] === 'function') {