Provide a way to construct a default Package

[jyn514]

Right now, I'm working with this monstrosity:

let package = serde_json::from_value(serde_json::json!({
                "packages": [
                    /*
                    {
                    "name": "doom-rustdoc",
                    "version": "1.0.0",
                    "id": "doom-rustdoc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
                    "license": "Unlicense",
                    "license_file": null,
                    "description": "Doom running in Rustdoc",
                    "source": "registry+https://github.com/rust-lang/crates.io-index",
                    "dependencies": [],
                    "targets": [
                        {
                        "kind": [
                            "lib"
                        ],
                        "crate_types": [
                            "lib"
                        ],
                        "name": "doom-rustdoc",
                        //"src_path": "/home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/doom-rustdoc-1.0.0/src/lib.rs",
                        "edition": "2018",
                        "doc": true,
                        "doctest": true,
                        "test": true
                        }
                    ],
                    "features": {},
                    //"manifest_path": "/home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/doom-rustdoc-1.0.0/Cargo.toml",
                    "metadata": null,
                    "publish": null,
                    "authors": [
                        //"Kestrer <kestrer.dev@gmail.com>"
                    ],
                    "categories": [],
                    "keywords": [],
                    "readme": null,
                    "repository": null,
                    "homepage": null,
                    "documentation": null,
                    "edition": "2018",
                    "links": null
                    },
                    */
                    {
                    "name": "hello-world",
                    "version": "0.1.0",
                    //"id": "hello-world 0.1.0 (path+file:///home/joshua/src/rust/hello-world)",
                    "license": null,
                    "license_file": null,
                    "description": null,
                    "source": null,
                    "dependencies": [
                        {
                        "name": "doom-rustdoc",
                        "source": "registry+https://github.com/rust-lang/crates.io-index",
                        "req": "^1",
                        "kind": null,
                        "rename": null,
                        "optional": false,
                        "uses_default_features": true,
                        "features": [],
                        "target": null,
                        "registry": null
                        }
                    ],
                    "targets": [
                        {
                        "kind": [
                            "bin"
                        ],
                        "crate_types": [
                            "bin"
                        ],
                        "name": "hello-world",
                        //"src_path": "/home/joshua/src/rust/hello-world/src/main.rs",
                        "edition": "2018",
                        "doc": true,
                        "doctest": false,
                        "test": true
                        }
                    ],
                    "features": {},
                    //"manifest_path": "/home/joshua/src/rust/hello-world/Cargo.toml",
                    "metadata": null,
                    "publish": null,
                    "authors": [],
                    "categories": [],
                    "keywords": [],
                    "readme": null,
                    "repository": null,
                    "homepage": null,
                    "documentation": null,
                    "edition": "2018",
                    "links": null
                    }
                ],
                "workspace_members": [
                    //"hello-world 0.1.0 (path+file:///home/joshua/src/rust/hello-world)"
                ],
                "resolve": {
                    "nodes": [
                    {
                        "id": "doom-rustdoc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
                        "dependencies": [],
                        "deps": [],
                        "features": []
                    },
                    {
                        "id": "hello-world 0.1.0 (path+file:///home/joshua/src/rust/hello-world)",
                        "dependencies": [
                        "doom-rustdoc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)"
                        ],
                        "deps": [
                        {
                            "name": "doom_rustdoc",
                            "pkg": "doom-rustdoc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
                            "dep_kinds": [
                            {
                                "kind": null,
                                "target": null
                            }
                            ]
                        }
                        ],
                        "features": []
                    }
                    ],
                    "root": "hello-world 0.1.0 (path+file:///home/joshua/src/rust/hello-world)"
                },
                //"target_directory": "/home/joshua/.local/lib/cargo/target",
                //"version": 1,
                "workspace_root": "hello-world",
                "metadata": null
            }))
            .unwrap();

It would be nice to have a way to default construct a Package instead.

[jplatte]

I just had a look and found there is a builder feature that uses the derive_builder crate to generate a builder for some types like Package, does that help?