Extract shell script

flake.nix

@@ -4,12 +4,14 @@
   inputs = {
     flake-utils.url = github:numtide/flake-utils;
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.11";
+    scripts.url = "github:Smaug123/flake-shell-script";
   };
 
   outputs = {
     self,
     nixpkgs,
     flake-utils,
+    scripts,
   }: let
     commit = self.shortRev or "dirty";
     date = self.lastModifiedDate or self.lastModified or "19700101";
@@ -21,46 +23,15 @@
       texlive = pkgs.texlive.combine {
         inherit (pkgs.texlive) scheme-medium mdframed etoolbox zref needspace tikz-cd;
       };
-    in let
-      createShellScript = name: contents:
-        pkgs.stdenv.mkDerivation {
-          __contentAddressed = true;
-          pname = name;
-          version = "0.1.0";
-          src = contents;
-
-          buildInputs = [
-            pkgs.shellcheck
-          ];
-
-          phases = ["configurePhase" "buildPhase" "installPhase"];
-
-          configurePhase = ''
-            ${pkgs.shellcheck}/bin/shellcheck "${contents}"
-          '';
-
-          buildPhase = ''
-            cp "${contents}" run.sh
-            patchShebangs run.sh
-            sed -i 's_"/bin/bash"_"${pkgs.bash}/bin/bash"_' run.sh
-          '';
-
-          installPhase = ''
-            mkdir -p $out
-            mv run.sh $out/run.sh
-          '';
-        };
-    in let
-      buildLatex = createShellScript "latex" ./build.sh;
     in {
       packages.default = pkgs.stdenv.mkDerivation {
         __contentAddressed = true;
         inherit version;
         pname = "patrickstevens.co.uk-pdfs";
         src = ./.;
-        buildInputs = [texlive buildLatex];
+        buildInputs = [texlive];
         buildPhase = ''
-          ${pkgs.bash}/bin/sh ${buildLatex}/run.sh .
+          ${pkgs.bash}/bin/sh ${scripts.lib.createShellScript pkgs "latex" ./build.sh}/run.sh .
         '';
 
         installPhase = ''