supercollider: add plugin support

pkgs/development/interpreters/supercollider/default.nix

@@ -1,12 +1,9 @@
-{ lib, stdenv, mkDerivation, fetchurl, cmake, pkg-config, alsa-lib
-, libjack2, libsndfile, fftw, curl, gcc
-, libXt, qtbase, qttools, qtwebengine
+{ lib, stdenv, mkDerivation, fetchurl, cmake
+, pkg-config, alsa-lib, libjack2, libsndfile, fftw
+, curl, gcc, libXt, qtbase, qttools, qtwebengine
 , readline, qtwebsockets, useSCEL ? false, emacs
 }:
 
-let
-  inherit (lib) optional;
-in
 mkDerivation rec {
   pname = "supercollider";
   version = "3.12.2";
@@ -16,6 +13,17 @@ mkDerivation rec {
     sha256 = "sha256-1QYorCgSwBK+SVAm4k7HZirr1j+znPmVicFmJdvO3g4=";
   };
 
+  patches = [
+    # add support for SC_DATA_DIR and SC_PLUGIN_DIR env vars to override compile-time values
+    ./supercollider-3.12.0-env-dirs.patch
+  ];
+
+  nativeBuildInputs = [ cmake pkg-config qttools ];
+
+  buildInputs = [ gcc libjack2 libsndfile fftw curl libXt qtbase qtwebengine qtwebsockets readline ]
+    ++ lib.optional (!stdenv.isDarwin) alsa-lib
+    ++ lib.optional useSCEL emacs;
+
   hardeningDisable = [ "stackprotector" ];
 
   cmakeFlags = [
@@ -23,13 +31,6 @@ mkDerivation rec {
     "-DSC_EL=${if useSCEL then "ON" else "OFF"}"
   ];
 
-  nativeBuildInputs = [ cmake pkg-config qttools ];
-
-  buildInputs = [
-    gcc libjack2 libsndfile fftw curl libXt qtbase qtwebengine qtwebsockets readline ]
-      ++ optional (!stdenv.isDarwin) alsa-lib
-      ++ optional useSCEL emacs;
-
   meta = with lib; {
     description = "Programming language for real time audio synthesis";
     homepage = "https://supercollider.github.io";

pkgs/development/interpreters/supercollider/supercollider-3.12.0-env-dirs.patch

@@ -0,0 +1,65 @@
+diff --git a/common/SC_Filesystem_unix.cpp b/common/SC_Filesystem_unix.cpp
+index 52dc1fd2d..aae09ed9c 100644
+--- a/common/SC_Filesystem_unix.cpp
++++ b/common/SC_Filesystem_unix.cpp
+@@ -94,6 +94,10 @@ bool SC_Filesystem::isNonHostPlatformDirectoryName(const std::string& s) {
+ }
+ 
+ Path SC_Filesystem::defaultSystemAppSupportDirectory() {
++    const char* sc_data_dir = getenv("SC_DATA_DIR");
++    if (sc_data_dir)
++        return Path(sc_data_dir);
++
+ #    ifdef SC_DATA_DIR
+     return Path(SC_DATA_DIR);
+ #    else
+@@ -125,6 +129,10 @@ Path SC_Filesystem::defaultUserConfigDirectory() {
+ }
+ 
+ Path SC_Filesystem::defaultResourceDirectory() {
++    const char* sc_data_dir = getenv("SC_DATA_DIR");
++    if (sc_data_dir)
++        return Path(sc_data_dir);
++
+ #    ifdef SC_DATA_DIR
+     return Path(SC_DATA_DIR);
+ #    else
+diff --git a/server/scsynth/SC_Lib_Cintf.cpp b/server/scsynth/SC_Lib_Cintf.cpp
+index f6219307e..28e13eb98 100644
+--- a/server/scsynth/SC_Lib_Cintf.cpp
++++ b/server/scsynth/SC_Lib_Cintf.cpp
+@@ -178,9 +178,13 @@ void initialize_library(const char* uGensPluginPath) {
+     using DirName = SC_Filesystem::DirName;
+ 
+     if (loadUGensExtDirs) {
++        const char* sc_plugin_dir = getenv("SC_PLUGIN_DIR");
++        if (sc_plugin_dir) {
++            PlugIn_LoadDir(sc_plugin_dir, true);
++        }
+ #ifdef SC_PLUGIN_DIR
+         // load globally installed plugins
+-        if (bfs::is_directory(SC_PLUGIN_DIR)) {
++        else if (bfs::is_directory(SC_PLUGIN_DIR)) {
+             PlugIn_LoadDir(SC_PLUGIN_DIR, true);
+         }
+ #endif // SC_PLUGIN_DIR
+diff --git a/server/supernova/server/main.cpp b/server/supernova/server/main.cpp
+index b2b5adf4e..6cb8c411c 100644
+--- a/server/supernova/server/main.cpp
++++ b/server/supernova/server/main.cpp
+@@ -224,8 +224,14 @@ void set_plugin_paths(server_arguments const& args, nova::sc_ugen_factory* facto
+             }
+         }
+     } else {
++        const char* sc_plugin_dir = getenv("SC_PLUGIN_DIR");
++        if (sc_plugin_dir) {
++            factory->load_plugin_folder(sc_plugin_dir);
++        }
+ #ifdef SC_PLUGIN_DIR
+-        factory->load_plugin_folder(SC_PLUGIN_DIR);
++        else {
++            factory->load_plugin_folder(SC_PLUGIN_DIR);
++        }
+ #endif
+         factory->load_plugin_folder(SC_Filesystem::instance().getDirectory(DirName::Resource) / SC_PLUGIN_DIR_NAME);
+         factory->load_plugin_folder(SC_Filesystem::instance().getDirectory(DirName::SystemExtension));

pkgs/development/interpreters/supercollider/wrapper.nix

@@ -0,0 +1,18 @@
+{ symlinkJoin, makeWrapper, supercollider, plugins }:
+
+symlinkJoin {
+  name = "supercollider-with-plugins-${supercollider.version}";
+  paths = [ supercollider ] ++ plugins;
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  postBuild = ''
+    for exe in $out/bin/*; do
+      wrapProgram $exe \
+        --set SC_PLUGIN_DIR "$out/lib/SuperCollider/plugins" \
+        --set SC_DATA_DIR   "$out/share/SuperCollider"
+    done
+  '';
+
+  inherit (supercollider) pname version meta;
+}

pkgs/top-level/all-packages.nix

@@ -14432,6 +14432,10 @@ with pkgs;
 
   supercollider_scel = supercollider.override { useSCEL = true; };
 
+  supercollider-with-plugins = callPackage ../development/interpreters/supercollider/wrapper.nix {
+    plugins = [];
+  };
+
   taktuk = callPackage ../applications/networking/cluster/taktuk { };
 
   tcl = tcl-8_6;