From a55f312407658ff4042b0c1bc087dd884651f76f Mon Sep 17 00:00:00 2001
From: Dimitar Kerezov <dimitar.kerezov@telerik.com>
Date: Tue, 27 Feb 2018 19:28:11 +0200
Subject: [PATCH] feat: consume shouldprepare hook

---
 lib/before-shouldPrepare.js | 24 ++++++++++++++++++++++++
 package.json                |  5 +++++
 2 files changed, 29 insertions(+)
 create mode 100644 lib/before-shouldPrepare.js

diff --git a/lib/before-shouldPrepare.js b/lib/before-shouldPrepare.js
new file mode 100644
index 00000000..36ef9ad7
--- /dev/null
+++ b/lib/before-shouldPrepare.js
@@ -0,0 +1,24 @@
+const { join } = require("path");
+const { readFileSync, existsSync, writeFileSync } = require("fs");
+const envOptionsCacheFileLocation = join(__dirname, "env.cache.json");
+
+module.exports = function (hookArgs) {
+	const platformInfo = hookArgs.shouldPrepareInfo && hookArgs.shouldPrepareInfo.platformInfo;
+	if (platformInfo && platformInfo.appFilesUpdaterOptions && platformInfo.appFilesUpdaterOptions.bundle) {
+		return (args, originalMethod) => {
+			return originalMethod(...args).then(originalShouldPrepare => {
+				const currentEnvString = JSON.stringify(platformInfo.env || {});
+				if (existsSync(envOptionsCacheFileLocation)) {
+					const oldEnvOptionsString = readFileSync(envOptionsCacheFileLocation).toString();
+					if (oldEnvOptionsString === currentEnvString) {
+						return originalShouldPrepare;
+					}
+				}
+
+				writeFileSync(envOptionsCacheFileLocation, currentEnvString);
+
+				return true;
+			});
+		};
+	}
+}
diff --git a/package.json b/package.json
index 69b41d5b..78709a08 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,11 @@
         "script": "lib/before-watchPatterns.js",
         "inject": true
       },
+      {
+        "type": "before-shouldPrepare",
+        "script": "lib/before-shouldPrepare.js",
+        "inject": true
+      },
       {
         "type": "after-prepare",
         "script": "lib/after-prepare.js",