Prototype nix expression generation

There are some limitations to this implementation:

1. Using `runCommand` means this will re-run any time anything changes in the
repo. The solution is to use the existing import detection to make a list of
source files, and put that into a `stdenv.mkDerivation`, which I'll do next.

2. The `NeatInterpolation` usage is ugly. The templated nix code should be
extracted into its own file, such as `Biz/Bild/Builder.nix`.

3. I'm not actually calling it yet. The ideal thing would be to call
`nix-instantiate`, get the output drv path, and then call `nix-store --realise`
on that. To do that I need to refactor my `proc` function to return stdout to
the calling function, and I should probably just make helper functions like
`nixInstatiate :: Target -> IO DrvPath` and `nixStoreRealise :: DrvPath ->
NixStorePath`, or something like that.

1 files changed, 5 insertions, 7 deletions

diff --git a/Biz/Bild.nix b/Biz/Bild.nix
index a51a3d0..2a049b0 100644
--- a/Biz/Bild.nix
+++ b/Biz/Bild.nix
@@ -36,7 +36,7 @@ rec {
   };
 
   # generally-useful things from nixpkgs
-  inherit (nixpkgs) lib stdenv sources;
+  inherit (nixpkgs) lib stdenv sources runCommand;
 
   # expose some packages for inclusion in os/image builds
   pkgs = with nixpkgs.pkgs; [ git ];
@@ -45,14 +45,12 @@ rec {
   bildRuntimeDeps = with nixpkgs; [
     pkg-config
     gnutls
-    guile
-    SDL
     private.ghcPackageSetBild
     rustc
-    gcc
-    gdb
-    valgrind
-    argp-standalone
+    # c deps
+    gcc gdb valgrind argp-standalone SDL
+    # lisp deps
+    guile
     (private.sbclWith (p: with p; [asdf alexandria])) # just enough to build Example.lisp
   ];