From 88af507c33ab32ae23e35bde9cd7fbbc0d534390 Mon Sep 17 00:00:00 2001
From: Ben Sima <ben@bsima.me>
Date: Thu, 3 Aug 2023 22:25:06 -0400
Subject: Move buildPhase to a nix-instantiate argument

---
 Biz/Bild/Builder.nix | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Biz/Bild/Builder.nix

(limited to 'Biz/Bild/Builder.nix')

diff --git a/Biz/Bild/Builder.nix b/Biz/Bild/Builder.nix
new file mode 100644
index 0000000..a0ed17c
--- /dev/null
+++ b/Biz/Bild/Builder.nix
@@ -0,0 +1,34 @@
+{ srcs # list of files
+, root # path to git root
+, packageSet # name mapped to private.${packageSet}, e.g. 'ghcWith'
+, langDeps ? null # list of deps (as a string), split and passed to packageSet
+, name # exe name
+, main # entrypoint file
+, mainIs # entrypoint module name
+, buildPhase
+}:
+with import (/. + root + "/Biz/Bild.nix") {};
+with builtins;
+let
+  srcs_ = lib.strings.splitString " " srcs;
+  skip = ["_" ".direnv"];
+  filter = file: type:
+    if elem (baseNameOf file) skip then false
+    # TODO: this means any new directory will cause a rebuild. this bad.
+    # i should recurse into the directory and match against the srcsr
+    else if type == "directory" then true
+    else if type == "regular" then builtins.elem file srcs_
+    else false;
+   deps = pkgset:
+     if langDeps != null then
+       private.selectAttrs (lib.strings.splitString " " langDeps) pkgset
+     else
+       [];
+in stdenv.mkDerivation {
+  inherit name buildPhase;
+  buildInputs = [ (private.${packageSet} deps) ];
+  src = lib.sources.cleanSourceWith {inherit filter; src = lib.sources.cleanSource root;};
+  installPhase = ''
+    mkdir -p $out/bin && cp ${name} $out/bin
+  '';
+}
-- 
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