feat(build123d): support multiple outputs from the builder script and replace the objectName and outputFileName with just outputName

build123d/default.nix

@@ -33,25 +33,36 @@
             cadquery
             build123d
           ]);
+
+        outputExt = [
+          "step"
+          "stl"
+          "3mf"
+        ];
       in {
         options.krantz.build123d = {
-          enable = lib.mkEnableOption "executing a python build123d/cadquery file to get a 3d file";
-
-          objectName = lib.mkOption {
-            description = "What to name this object.";
-            type = lib.types.str;
-            example = "box";
-          };
+          enable = lib.mkEnableOption "executing a python build123d/cadquery file to generate 3d files";
 
           builder = lib.mkOption {
-            description = "The path to python cad script that generates the 3d file.";
+            description = "The path to python cad script that generates the 3d file(s).";
             type = lib.types.path;
             example = lib.literalExpression "./build3d.py";
           };
-          outputFileName = lib.mkOption {
-            description = "The name of the 3d file the builder script will output. After the builder is run this file must appear in the current working directory.";
+
+          outputName = lib.mkOption {
+            description = ''
+              The derivation's name that will also be used to rename the following default outputs.
+
+              ${
+                # output.${ext} where ext is from the outputExt list
+                lib.concatStringsSep "\n" (lib.map (ext: "* output.${ext}") outputExt)
+              }
+
+              If left empty no files will be renamed.
+            '';
             type = lib.types.str;
-            default = "output.step";
+            default = "";
+            example = "box_for_stuf";
           };
 
           devShell = {
@@ -83,7 +94,7 @@
               description = "The name of the attribute in packages to configure";
               type = lib.types.str;
               default = "default";
-              example = "step";
+              example = "3dfiles";
             };
           };
         };
@@ -106,18 +117,31 @@
 
           # Your custom packages
           # Accessible through 'nix build', 'nix shell', 'nix run', etc
-          packages.${cfg.package.name} = lib.mkIf cfg.package.enable (pkgs.runCommand cfg.objectName {}
+          packages.${cfg.package.name} = lib.mkIf cfg.package.enable (pkgs.runCommand cfg.outputName {}
             /*
             bash
             */
             ''
-              RESULT_FILE_NAME=${cfg.objectName}.${lib.last (lib.splitString "." cfg.outputFileName)}
+              mkdir $out
+              cd $out
 
               ${pyEnv}/bin/python ${cfg.builder}
 
-              mkdir $out
-              mv ${cfg.outputFileName} $out/$RESULT_FILE_NAME
-              ln -s ./$RESULT_FILE_NAME $out/${cfg.outputFileName}
+              ${
+                if cfg.outputName != ""
+                then
+                  /*
+                  bash
+                  */
+                  ''
+                    for ext in ${lib.concatStringsSep " " outputExt}; do
+                      if [[ -f output.$ext ]]; then
+                        mv output.$ext ${cfg.outputName}.$ext
+                      fi
+                    done
+                  ''
+                else ""
+              }
             '');
         };
       });