From ab021155a19c9c8b6c869caa07c72dd8b5c113ee Mon Sep 17 00:00:00 2001
From: Max Horn <max@quendi.de>
Date: Tue, 7 Sep 2021 00:47:17 +0200
Subject: [PATCH] Add DirectoriesPackageProgramsOverrides

For use in Julia wrapper packages for GAP packages that included a
kernel extension or otherwise compiled code: they carry the (GAP) source
code for a GAP package in one Julia artifact, and the compiled binary in
another (via a JLL). It is easy enough to point GAP at the former, via
`SetPackagePath`; but we need this patch to also handle the latter.
---
 lib/pkg.g  | 12 ++++++++++++
 src/GAP.jl |  2 ++
 2 files changed, 14 insertions(+)
 create mode 100644 lib/pkg.g

diff --git a/lib/pkg.g b/lib/pkg.g
new file mode 100644
index 00000000..558f7722
--- /dev/null
+++ b/lib/pkg.g
@@ -0,0 +1,12 @@
+BindGlobal("DirectoriesPackageProgramsOverrides", rec());
+BindGlobal("DirectoriesPackageProgramsOriginal", DirectoriesPackagePrograms);
+
+MakeReadWriteGlobal("DirectoriesPackagePrograms");
+DirectoriesPackagePrograms := function(name)
+    name:= LowercaseString(name);
+    if IsBound(DirectoriesPackageProgramsOverrides.(name)) then
+        return [ Directory( DirectoriesPackageProgramsOverrides.(name) ) ];
+    fi;
+    return DirectoriesPackageProgramsOriginal(name);
+end;
+MakeReadOnlyGlobal("DirectoriesPackagePrograms");
diff --git a/src/GAP.jl b/src/GAP.jl
index 38a64bca..6b4374d3 100644
--- a/src/GAP.jl
+++ b/src/GAP.jl
@@ -156,6 +156,8 @@ function initialize(argv::Vector{String})
         error("JuliaInterface could not be loaded")
     end
 
+    GAP.Globals.Read(GapObj(joinpath(@__DIR__, "..", "lib", "pkg.g")))
+
     # If we are in "stand-alone mode", stop here
     if handle_signals
         ccall((:SyInstallAnswerIntr, libgap), Cvoid, ())