From 3fd51087800666bc8aa11545dd37c0325601dee6 Mon Sep 17 00:00:00 2001
From: Mustafa Çalışkan <musfay@protonmail.com>
Date: Sat, 19 Jun 2021 12:45:14 +0300
Subject: multimc: hardcode jdk paths and use latest jdk by default

---
 .../multimc/0001-pick-latest-java-first.patch      | 48 ++++++++++++++++++++++
 pkgs/games/multimc/default.nix                     | 18 ++++++--
 2 files changed, 62 insertions(+), 4 deletions(-)
 create mode 100644 pkgs/games/multimc/0001-pick-latest-java-first.patch

diff --git a/pkgs/games/multimc/0001-pick-latest-java-first.patch b/pkgs/games/multimc/0001-pick-latest-java-first.patch
new file mode 100644
index 00000000000..31ab0497f8d
--- /dev/null
+++ b/pkgs/games/multimc/0001-pick-latest-java-first.patch
@@ -0,0 +1,48 @@
+From 44e1b2a19a869b907b40e56c85c8a47aa6c22097 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Mustafa=20=C3=87al=C4=B1=C5=9Fkan?= <musfay@protonmail.com>
+Date: Tue, 22 Jun 2021 21:50:11 +0300
+Subject: [PATCH] pick latest java first
+
+---
+ api/logic/java/JavaInstallList.cpp | 4 ++--
+ api/logic/java/JavaUtils.cpp       | 2 +-
+ 2 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/api/logic/java/JavaInstallList.cpp b/api/logic/java/JavaInstallList.cpp
+index 0bded03c..40898e20 100644
+--- a/api/logic/java/JavaInstallList.cpp
++++ b/api/logic/java/JavaInstallList.cpp
+@@ -120,8 +120,8 @@ void JavaInstallList::updateListData(QList<BaseVersionPtr> versions)
+ 
+ bool sortJavas(BaseVersionPtr left, BaseVersionPtr right)
+ {
+-    auto rleft = std::dynamic_pointer_cast<JavaInstall>(left);
+-    auto rright = std::dynamic_pointer_cast<JavaInstall>(right);
++    auto rleft = std::dynamic_pointer_cast<JavaInstall>(right);
++    auto rright = std::dynamic_pointer_cast<JavaInstall>(left);
+     return (*rleft) > (*rright);
+ }
+ 
+diff --git a/api/logic/java/JavaUtils.cpp b/api/logic/java/JavaUtils.cpp
+index 5f004a10..6d633631 100644
+--- a/api/logic/java/JavaUtils.cpp
++++ b/api/logic/java/JavaUtils.cpp
+@@ -350,7 +350,6 @@ QList<QString> JavaUtils::FindJavaPaths()
+     qDebug() << "Linux Java detection incomplete - defaulting to \"java\"";
+ 
+     QList<QString> javas;
+-    javas.append(this->GetDefaultJava()->path);
+     auto scanJavaDir = [&](const QString & dirPath)
+     {
+         QDir dir(dirPath);
+@@ -379,6 +378,7 @@ QList<QString> JavaUtils::FindJavaPaths()
+     // general locations used by distro packaging
+     scanJavaDir("/usr/lib/jvm");
+     scanJavaDir("/usr/lib32/jvm");
++    javas.append(this->GetDefaultJava()->path);
+     // javas stored in MultiMC's folder
+     scanJavaDir("java");
+     return javas;
+-- 
+2.31.1
+
diff --git a/pkgs/games/multimc/default.nix b/pkgs/games/multimc/default.nix
index 4304128ac21..aa32efaa940 100644
--- a/pkgs/games/multimc/default.nix
+++ b/pkgs/games/multimc/default.nix
@@ -1,7 +1,6 @@
-{ lib, mkDerivation, fetchFromGitHub, cmake, jdk8, zlib, file, makeWrapper, xorg, libpulseaudio, qtbase, libGL }:
+{ lib, mkDerivation, fetchFromGitHub, cmake, jdk8, jdk, zlib, file, makeWrapper, xorg, libpulseaudio, qtbase, libGL }:
 
 let
-  jdk = jdk8;
   libpath = with xorg; lib.makeLibraryPath [ libX11 libXext libXcursor libXrandr libXxf86vm libpulseaudio libGL ];
 in mkDerivation rec {
   pname = "multimc";
@@ -14,7 +13,16 @@ in mkDerivation rec {
     fetchSubmodules = true;
   };
   nativeBuildInputs = [ cmake file makeWrapper ];
-  buildInputs = [ qtbase jdk zlib ];
+  buildInputs = [ qtbase jdk8 zlib ];
+
+  patches = [ ./0001-pick-latest-java-first.patch ];
+
+  postPatch = ''
+    # hardcode jdk paths
+    substituteInPlace api/logic/java/JavaUtils.cpp \
+      --replace 'scanJavaDir("/usr/lib/jvm")' 'javas.append("${jdk}/lib/openjdk/bin/java")' \
+      --replace 'scanJavaDir("/usr/lib32/jvm")' 'javas.append("${jdk8}/lib/openjdk/bin/java")'
+  '';
 
   cmakeFlags = [ "-DMultiMC_LAYOUT=lin-system" ];
 
@@ -23,7 +31,9 @@ in mkDerivation rec {
     install -Dm755 ../application/package/linux/multimc.desktop $out/share/applications/multimc.desktop
 
     # xorg.xrandr needed for LWJGL [2.9.2, 3) https://github.com/LWJGL/lwjgl/issues/128
-    wrapProgram $out/bin/multimc --set GAME_LIBRARY_PATH /run/opengl-driver/lib:${libpath} --prefix PATH : ${jdk}/bin/:${xorg.xrandr}/bin/
+    wrapProgram $out/bin/multimc \
+      --set GAME_LIBRARY_PATH /run/opengl-driver/lib:${libpath} \
+      --prefix PATH : ${lib.makeBinPath [ xorg.xrandr ]}
   '';
 
   meta = with lib; {
-- 
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