Derivation in seperate file

default.nix

@@ -0,0 +1,28 @@
+{ pkgs
+, scdoc
+, xclip
+, stdenvNoCC
+, ...
+}:
+stdenvNoCC.mkDerivation rec {
+  pname = "irs";
+  version = "0.3";
+  src = ./src;
+  nativeBuildInputs = with pkgs; [
+    scdoc
+  ];
+
+  buildPhase = ''
+    for page in $(find manpages -type f); do
+      scdoc < $page > $(basename $page .scd)
+    done
+  '';
+
+  installPhase = ''
+    mkdir -p $out/{share/man/man1,bin,share/zsh/site-functions}
+    cp bin/* $out/bin/
+    cp completions/* $out/share/zsh/site-functions/
+    cp *.1 $out/share/man/man1/
+  '';
+
+}