feat(example): add basic example showing how this can be used in simp…

…le workers project.

.gitignore

@@ -1 +1,4 @@
-result
+result
+examples/hello-world/.direnv
+examples/hello-world/node_modules/.mf
+examples/hello-world/.wrangler/tmp

README.md

@@ -41,6 +41,9 @@ Get the recent release of wrangler from FlakeHub in your flake inputs:
 }
 ```
 
+A more specific example of how this can be used in a workers project is 
+provided in [examples/hello-world](examples/hello-world).
+
 ## Maintainers
 
 - [dezren39](https://github.com/dezren39)

examples/hello-world/.envrc

@@ -0,0 +1 @@
+use flake

examples/hello-world/README.md

@@ -0,0 +1,76 @@
+# Hello world example
+
+This simple example shows how to use `wrangler` with a flake.
+
+It assumes:
+- that flakes are enabled in your system - see [here](https://nixos.wiki/wiki/flakes) for more info on this.
+- that you have `direnv` installed and set up.
+
+To date, this has only been tested on `x86_64-linux` NixOS systems; we would be
+happy to have input from users on other systems.
+
+To run it, simply open a shell in this directory; if `direnv` is active, it 
+should ask you to enable `direnv` for this directory. You should see something 
+like the following (depending on what shell you use etc):
+
+```shell
+🕙 13:03:30 ❯ cd examples/hello-world/
+direnv: error /home/sean/Work/wrangler/examples/hello-world/.envrc is blocked. Run `direnv allow` to approve its content
+```
+
+Run `direnv allow`:
+
+```shell:
+🕙 13:04:02 ❯ direnv allow
+direnv: loading ~/Work/wrangler/examples/hello-world/.envrc
+direnv: using flake
+direnv: nix-direnv: Using cached dev shell
+direnv: export +AR +AS +CC +CONFIG_SHELL +CXX +HOST_PATH +IN_NIX_SHELL +LD +NIX_BINTOOLS +NIX_BINTOOLS_WRAPPER_TARGET_HOST_x86_64_unknown_linux_gnu +NIX_BUILD_CORES +NIX_CC +NIX_CC_WRAPPER_TARGET_HOST_x86_64_unknown_linux_gnu +NIX_CFLAGS_COMPILE +NIX_ENFORCE_NO_NATIVE +NIX_HARDENING_ENABLE +NIX_LDFLAGS +NIX_STORE +NM +OBJCOPY +OBJDUMP +RANLIB +READELF +SIZE +SOURCE_DATE_EPOCH +STRINGS +STRIP +__structuredAttrs +buildInputs +buildPhase +builder +cmakeFlags +configureFlags +depsBuildBuild +depsBuildBuildPropagated +depsBuildTarget +depsBuildTargetPropagated +depsHostHost +depsHostHostPropagated +depsTargetTarget +depsTargetTargetPropagated +doCheck +doInstallCheck +dontAddDisableDepTrack +mesonFlags +name +nativeBuildInputs +out +outputs +patches +phases +preferLocalBuild +propagatedBuildInputs +propagatedNativeBuildInputs +shell +shellHook +stdenv +strictDeps +system ~PATH ~XDG_DATA_DIRS
+```
+
+This should run `flake.nix` to create a development shell which contains the latest version 
+of `wrangler`; this will create a `flake.lock` file in the current directory which you can 
+commit if you like - if you commit this, then you are pinning the `wrangler` version until 
+you perform `nix flake update`. You can use `wrangler` directly from the command line as 
+follows:
+
+```shell
+🕙 13:05:19 ✖  wrangler --version
+
+ ⛅️ wrangler 3.67.1
+-------------------
+```
+
+To run the hello-world application locally:
+
+```shell
+🕙 13:05:22 ❯ wrangler dev
+
+ ⛅️ wrangler 3.67.1
+-------------------
+
+[wrangler:inf] Ready on http://localhost:8989
+⎔ Starting local server...
+╭─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
+│ [b] open a browser, [d] open Devtools, [l] turn off local mode, [c] clear console, [x] to exit                                                              │
+╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
+```
+
+Point your browser at `http://localhost:8989` to see the simple web page served
+by the worker running locally.
+
+## Updating to a newer version of `wrangler`
+
+If you use the github url for `wrangler`, you should simply be able to run `nix
+flake update`: this will check if there have been any updates to this github
+repo and update `flake.lock` and `wrangler` accordingly.
+
+If you're using the flakehub link for `wrangler`, you will need to update the 
+link in the `flake.nix` file to use the latest version.
+
+## Adding this to an existing project
+
+To add this functionality to an existing project which uses `wrangler`, simply 
+copy the `.envrc` and `flake.nix` files and amend as necessary. You will probably 
+have to add some extra files and directories to your `.gitignore` if you enable 
+this for the first time within the project.

examples/hello-world/flake.nix

@@ -0,0 +1,53 @@
+{
+  description = "A simple flake which shows how to use nix-packaged wrangler";
+
+  inputs = {
+    # Nixpkgs / NixOS version to use.
+    nixpkgs.url = "nixpkgs/nixos-24.05";
+
+    # this can be pinned to a specific flakehub version as follows:
+    #
+    # wrangler-flake.url = "https://flakehub.com/f/ryand56/wrangler/0.2.1.tar.gz"
+    #
+    # if it points to github, then running `nix flake update` will just get the 
+    # latest version from github and update wrangler as necessary.
+    wrangler-flake.url = "github:ryand56/wrangler";
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      wrangler-flake,
+    }:
+    let
+      # System types to support.
+      supportedSystems = [ "x86_64-linux" ];
+
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+      # Nixpkgs instantiated for supported system types.
+      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
+
+    in
+    {
+      # Add dependencies that are only needed for development
+      devShells = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgsFor.${system};
+        in
+        {
+          default = pkgs.mkShell {
+            packages = [
+              # it's possible to add this package as an override to nixpkgs; here it's just 
+              # added directly...
+              wrangler-flake.packages.${system}.wrangler
+              pkgs.cowsay # this is just included as an example of a package import from nixpkgs - include here any packages you require
+            ];
+          };
+        }
+      );
+    };
+}

examples/hello-world/worker.js

@@ -0,0 +1,18 @@
+// Taken from here:
+// https://developers.cloudflare.com/workers/examples/return-html/
+
+export default {
+  async fetch(request) {
+    const html = `<!DOCTYPE html>
+		<body>
+		  <h1>Hello World</h1>
+		  <p>This markup was generated by a Cloudflare Worker.</p>
+		</body>`;
+
+    return new Response(html, {
+      headers: {
+        "content-type": "text/html;charset=UTF-8",
+      },
+    });
+  },
+};

examples/hello-world/wrangler.toml

@@ -0,0 +1,7 @@
+name = "hello-world"
+main = "./worker.js"
+compatibility_date = "2024-07-26" # https://developers.cloudflare.com/workers/configuration/compatibility-dates/
+
+[dev]
+port = 8989
+local_protocol = "http"