lib: add foodogsquared's extended stdenv and custom builder for it

lib/builders/build-fds-env.nix

@@ -0,0 +1,8 @@
+{ buildEnv, extendedStdenv }:
+
+{ paths ? [ ], pathsToLink ? [ ], }@args:
+
+buildEnv (args // {
+  paths = paths ++ [ extendedStdenv ];
+  pathsToLink = pathsToLink ++ [ "/bin" "/etc" "/share" "/lib" ];
+})

lib/builders/default.nix

@@ -5,4 +5,6 @@
   makeXDGPortalConfiguration = pkgs.callPackage ./xdg/make-portal-config.nix { };
   makeXDGDesktopEntry = pkgs.callPackage ./xdg/make-desktop-entry.nix { };
   buildHugoSite = pkgs.callPackage ./hugo-build-site { };
+  buildFDSEnv =
+    pkgs.callPackage ./build-fds-env.nix { extendedStdenv = self.stdenv; };
 }

lib/default.nix

@@ -20,6 +20,21 @@ pkgs.lib.makeExtensible
     math = callLib ./math.nix;
     fetchers = callLib ./fetchers;
 
+    # foodogsquared's version of a standard environment. Basically just an
+    # extended version of nixpkgs' version that went overboard with
+    # developer-oriented dependencies.
+    stdenv = with pkgs;
+      [ stdenv direnv cookiecutter oils-for-unix nushell ipcalc ]
+      ++ lib.optional pkgs.isLinux [
+        gdb
+        moreutils
+        meson
+        ninja
+        pkg-config
+        man-pages
+        man-pages-posix
+      ];
+
     inherit (self.builders) makeXDGMimeAssociationList
       makeXDGPortalConfiguration makeXDGDesktopEntry;
     inherit (self.trivial) countAttrs filterAttrs';