feat(nix)!: Upgrade nixpkg to 25.05pre

BREAKING CHANGE: this requires a newer version of `nix-shell`, at least
2.18 onwards. You can upgrade following the steps at:

https://nixos.org/download/

In particular, these are the bumped packages:

* GHC (9.4.8 -> 9.6.6)
* Cabal ( -> 3.12.1.0)
* Fortran ( 7 -> pinned)

nix/pinned-24.05.nix

+import (builtins.fetchGit {
+  name = "nixos-24.05";
+  url = "https://github.com/nixos/nixpkgs";
+  ref = "refs/heads/nixos-24.05";
+  rev = "63dacb46bf939521bdc93981b4cbb7ecb58427a0";
+})

nix/pinned-25.05.nix

+import (builtins.fetchTarball "https://github.com/NixOS/nixpkgs/archive/c46290747b2aaf090f48a478270feb858837bf11.tar.gz")

nix/pkgs.nix

-{ pkgs       ? import ./pinned-23.11.nix {} }:
+{ pkgs       ? import ./pinned-25.05.nix {} }:
 
 rec {
   inherit pkgs;
-  ghc948 = if pkgs.stdenv.isDarwin
-           then pkgs.haskell.compiler.ghc948.overrideAttrs (finalAttrs: previousAttrs: {
-                patches = previousAttrs.patches ++ [
-                            # Reverts the linking behavior of GHC to not resolve `-libc++` to `c++`.
-                            (pkgs.fetchpatch {
-                              url = "https://gist.githubusercontent.com/adinapoli/bf722db15f72763bf79dff13a3104b6f/raw/362da0aa3db5c530e0d276183ba68569f216d65a/ghc947-macOS-loadArchive-fix.patch";
-                              sha256 = "sha256-0tHrkWRKFWUewj3uIA0DujVCXo1qgX2lA5p0MIsAHYs=";
-                            })
-                          ];
-                })
-           else pkgs.haskell.compiler.ghc948;
-  cabal_install_3_10_2_1 = pkgs.haskell.lib.compose.justStaticExecutables pkgs.haskell.packages.ghc948.cabal-install;
+  ghc966 = pkgs.haskell.compiler.ghc966;
+  cabal_install = pkgs.haskell.lib.compose.justStaticExecutables pkgs.haskell.packages.ghc966.cabal-install;
   graphviz_dev = pkgs.graphviz.overrideAttrs (finalAttrs: previousAttrs: {
     version = "11.0.0~dev";
     src = pkgs.fetchFromGitLab {
@@ -33,14 +23,10 @@ rec {
                           ];
                 });
 
-  # nng180 = pkgs.nng.overrideAttrs (new: old: rec {
-  #   version = "1.8.0";
-  # });
-  
   igraph_0_10_4 = pkgs.igraph.overrideAttrs (finalAttrs: previousAttrs: {
     version = "0.10.4";
 
-    nativeBuildInputs = previousAttrs.nativeBuildInputs or [] ++ [ pkgs.clang_12 ];
+    nativeBuildInputs = previousAttrs.nativeBuildInputs;
 
     src = pkgs.fetchFromGitHub {
       owner = "igraph";
@@ -53,7 +39,7 @@ rec {
       echo "0.10.4" > IGRAPH_VERSION
     '';
 
-    outputs = [ "out" "doc" ];
+    outputs = [ "dev" "out" "doc" ];
 
     buildInputs = [
       pkgs.arpack
@@ -64,7 +50,6 @@ rec {
       pkgs.libxml2
       pkgs.nanomsg
       pkgs.plfit
-    ] ++ pkgs.lib.optionals pkgs.stdenv.cc.isClang [
       pkgs.llvmPackages.openmp
     ];
 
@@ -81,23 +66,29 @@ rec {
       "-DIGRAPH_ENABLE_LTO=AUTO"
       "-DIGRAPH_ENABLE_TLS=ON"
       "-DBUILD_SHARED_LIBS=ON"
+      "-DCMAKE_INSTALL_PREFIX=${placeholder "out"}"
+      "-DCMAKE_INSTALL_LIBDIR=${placeholder "out"}/lib"
+      "-DCMAKE_INSTALL_DATADIR=${placeholder "out"}/share"
     ];
 
+    doCheck = false;
+
     postInstall = ''
       mkdir -p "$out/share"
       cp -r doc "$out/share"
     '';
 
     postFixup = previousAttrs.postFixup + ''
+      echo "Copying files where they belong .."
       CUR_DIR=$PWD
-      cd "$out/include/igraph" && cp *.h ../
+      cd "$dev/include/igraph" && cp *.h ../
       cd $CUR_DIR
     '';
 
   });
   hsBuildInputs = [
-    ghc948
-    cabal_install_3_10_2_1
+    ghc966
+    cabal_install
     pkgs.haskellPackages.alex
     pkgs.haskellPackages.happy
     pkgs.haskellPackages.pretty-show
@@ -113,25 +104,22 @@ rec {
     hlint
     libffi
     lapack
-    lzma
+    xz
     pcre
     pkg-config
     postgresql
     xz
     zlib
     blas
-    gfortran7
+    gfortran
     expat
     icu
     graphviz
-    clang_12
-    llvm_12
-    gcc12
+    gcc13
     igraph_0_10_4
     libpqxx
     libsodium
     nanomsg
-    # nng180
     zeromq
     curl
   ] ++ ( lib.optionals stdenv.isDarwin [
@@ -139,8 +127,8 @@ rec {
        ]);
   libPaths = pkgs.lib.makeLibraryPath nonhsBuildInputs;
   shellHook = ''
-    export LD_LIBRARY_PATH="${pkgs.gfortran7.cc.lib}:${libPaths}:$LD_LIBRARY_PATH"
-    export LIBRARY_PATH="${pkgs.gfortran7.cc.lib}:${libPaths}"
+    export LD_LIBRARY_PATH="${pkgs.gfortran.cc.lib}:${libPaths}:$LD_LIBRARY_PATH"
+    export LIBRARY_PATH="${pkgs.gfortran.cc.lib}:${libPaths}"
     export PATH="${pkgs.gccStdenv}/bin:$PATH"
     export NIX_CC="${pkgs.gccStdenv}"
     export CC="${pkgs.gccStdenv}/bin/gcc"