From 13afad80fb9b17503621dc63509113203af8887c Mon Sep 17 00:00:00 2001
From: kumquat-ir <66188216+kumquat-ir@users.noreply.github.com>
Date: Fri, 16 Apr 2021 17:45:55 -0700
Subject: [PATCH] replace ${file.jarVersion} with something useful

---
 api/logic/minecraft/mod/LocalModParseTask.cpp | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/api/logic/minecraft/mod/LocalModParseTask.cpp b/api/logic/minecraft/mod/LocalModParseTask.cpp
index cb35dca6..9f3da5a7 100644
--- a/api/logic/minecraft/mod/LocalModParseTask.cpp
+++ b/api/logic/minecraft/mod/LocalModParseTask.cpp
@@ -267,6 +267,43 @@ void LocalModParseTask::processAsZip()
 
         m_result->details = ReadMCModTOML(file.readAll());
         file.close();
+
+        // to replace ${file.jarVersion} with the actual version, as needed
+        if (m_result->details && m_result->details->version == "${file.jarVersion}")
+        {
+            if (zip.setCurrentFile("META-INF/MANIFEST.MF"))
+            {
+                if (!file.open(QIODevice::ReadOnly))
+                {
+                    zip.close();
+                    return;
+                }
+
+                // quick and dirty line-by-line parser
+                auto manifestLines = file.readAll().split('\n');
+                QString manifestVersion = "";
+                for (auto &line : manifestLines)
+                {
+                    if (QString(line).startsWith("Implementation-Version: "))
+                    {
+                        manifestVersion = QString(line).remove("Implementation-Version: ");
+                        break;
+                    }
+                }
+
+                // some mods use ${projectversion} in their build.gradle, causing this mess to show up in MANIFEST.MF
+                // also keep with forge's behavior of setting the version to "NONE" if none is found
+                if (manifestVersion.contains("task ':jar' property 'archiveVersion'") || manifestVersion == "")
+                {
+                    manifestVersion = "NONE";
+                }
+
+                m_result->details->version = manifestVersion;
+
+                file.close();
+            }
+        }
+
         zip.close();
         return;
     }