From 40ccbcf2cf53b1fd1476e7ced6b70c29d491d464 Mon Sep 17 00:00:00 2001
From: Ralph Amissah <ralph.amissah@gmail.com>
Date: Fri, 10 Apr 2026 23:16:06 -0400
Subject: nix keeping: shell.nix

---
 flake.lock               |  6 +++---
 flake.nix                |  3 ++-
 org/dlang-nix-flakes.org | 20 ++++++++++++++------
 shell.nix                | 17 ++++++++++++-----
 4 files changed, 31 insertions(+), 15 deletions(-)

diff --git a/flake.lock b/flake.lock
index f8094e4..aeaac22 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1775639890,
-        "narHash": "sha256-9O9gNidrdzcb7vgKGtff7QiLtr0IsVaCi0pAXm8anhQ=",
+        "lastModified": 1775793324,
+        "narHash": "sha256-omax7atcZbol+6HJ2RLpP+ZCFcPa5bZ65Hn71RufeWQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "456e8a9468b9d46bd8c9524425026c00745bc4d2",
+        "rev": "9d29d5f667d7467f98efc31881e824fa586c927e",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index a3653ef..2d344f2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -130,7 +130,8 @@
           ];
           #inherit shellHook;
         };
-        default = import ./shell.nix {inherit pkgs-nix;};
+        default = self.devShells.${system}.dsh-overlay-ldc;
+        #default = import ./shell.nix {inherit pkgs-nix;};
       });
   };
 }
diff --git a/org/dlang-nix-flakes.org b/org/dlang-nix-flakes.org
index 85a207c..e3a01ed 100644
--- a/org/dlang-nix-flakes.org
+++ b/org/dlang-nix-flakes.org
@@ -477,7 +477,8 @@ use flake .
           ];
           #inherit shellHook;
         };
-        default = import ./shell.nix {inherit pkgs-nix;};
+        default = self.devShells.${system}.dsh-overlay-ldc;
+        #default = import ./shell.nix {inherit pkgs-nix;};
       });
   };
 }
@@ -490,8 +491,17 @@ use flake .
 #+HEADER: :shebang "#!/usr/bin/env -S nix-shell --pure\n#!nix-shell -i bash"
 #+BEGIN_SRC nix
 {pkgs-nix ? import <nixpkgs> {}}:
+let
+  ldc = pkgs-nix.callPackage ./nix-overlays/ldc {};                                 # -> <<ldc_version>>
+  # dmd overlay reverts to gcc14Stdenv; gcc15 introduced nullptr in its headers
+  # and DMD's ImportC parser needs update to handle it. Monitor and update.
+  dmd = pkgs-nix.callPackage ./nix-overlays/dmd { stdenv = pkgs-nix.gcc14Stdenv; }; # -> <<dmd_version>>
+  dub = pkgs-nix.callPackage ./nix-overlays/dub { inherit ldc; };                   # -> <<dub_version>>
+  dtools = pkgs-nix.callPackage ./nix-overlays/dtools { inherit ldc; };             # -> <<dtools_version>>'
+in
 with pkgs-nix;
   mkShell {
+    name = "overlay_ldc-<<ldc_version>>_dub-<<dub_version>>_dtools-<<dtools_version>>";
     buildInputs = [
       # ❯❯❯ nix_related
       #nix
@@ -508,12 +518,11 @@ with pkgs-nix;
       # ❯❯❯ dev
       gnumake
       ps
-      # ❯❯❯ d_build_related
       # ❯❯ package manager
-      #dub
+      dub
       # ❯❯ compiler
       #dmd
-      #ldc
+      ldc
       #rund
       # ❯❯ linker
       #lld
@@ -522,8 +531,7 @@ with pkgs-nix;
       #ninja
       #meson
       # ❯❯ tools
-      #dub
-      #dtools
+      dtools
       # ❯❯❯ test
       #tilix
       #gtkd
diff --git a/shell.nix b/shell.nix
index 8e5bf10..eb6d246 100755
--- a/shell.nix
+++ b/shell.nix
@@ -1,8 +1,17 @@
 #!/usr/bin/env -S nix-shell --pure
 #!nix-shell -i bash
 {pkgs-nix ? import <nixpkgs> {}}:
+let
+  ldc = pkgs-nix.callPackage ./nix-overlays/ldc {};                                 # -> 1.42.0
+  # dmd overlay reverts to gcc14Stdenv; gcc15 introduced nullptr in its headers
+  # and DMD's ImportC parser needs update to handle it. Monitor and update.
+  dmd = pkgs-nix.callPackage ./nix-overlays/dmd { stdenv = pkgs-nix.gcc14Stdenv; }; # -> 2.111.0
+  dub = pkgs-nix.callPackage ./nix-overlays/dub { inherit ldc; };                   # -> 1.40.0
+  dtools = pkgs-nix.callPackage ./nix-overlays/dtools { inherit ldc; };             # -> 2.110.0'
+in
 with pkgs-nix;
   mkShell {
+    name = "overlay_ldc-1.42.0_dub-1.40.0_dtools-2.110.0";
     buildInputs = [
       # ❯❯❯ nix_related
       #nix
@@ -19,12 +28,11 @@ with pkgs-nix;
       # ❯❯❯ dev
       gnumake
       ps
-      # ❯❯❯ d_build_related
       # ❯❯ package manager
-      #dub
+      dub
       # ❯❯ compiler
       #dmd
-      #ldc
+      ldc
       #rund
       # ❯❯ linker
       #lld
@@ -33,8 +41,7 @@ with pkgs-nix;
       #ninja
       #meson
       # ❯❯ tools
-      #dub
-      #dtools
+      dtools
       # ❯❯❯ test
       #tilix
       #gtkd
-- 
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