Add placeholder --run-server support.

This allows the program to run as a web server,
which will eventually be able to return
mushroom models.

Cargo.toml

@@ -6,6 +6,7 @@ edition = "2021"
 [dependencies]
 approx = "0.5.1"
 clap = { version = "4.5.4", features = ["derive"] }
+rocket = "0.5.1"
 serde = "1.0.203"
 serde_derive = "1.0.203"
 stl_io = "0.7.0"

src/args.rs

@@ -8,6 +8,10 @@ pub struct Args {
     #[arg(long, default_value = "mesh.stl")]
     pub output: String,
 
+    /// Shape of the cap.
+    #[arg(long, default_value_t = false)]
+    pub run_server: bool,
+
     /// Height of total mushroom in millimeters.
     #[arg(long, default_value_t = 100)]
     pub height: u32,

src/main.rs

@@ -9,9 +9,24 @@ use std::fs::OpenOptions;
 extern crate approx;
 use clap::Parser;
 
-fn main() {
+#[macro_use]
+extern crate rocket;
+
+#[get("/")]
+fn hello() -> &'static str {
+    "Hello, world!"
+}
+
+#[rocket::main]
+async fn main() {
     let args = args::Args::parse();
 
+    if args.run_server {
+        // If we run as a server, ignore other arguments.
+        let _ = rocket::build().mount("/", routes![hello]).launch().await;
+        return;
+    }
+
     // Define the mushroom.
     let mushroom = args.mushroom_from_args();