Add ServerReference::resolve_lazy

Cargo.toml

@@ -5,3 +5,4 @@ edition = "2021"
 
 [dependencies]
 clap = { version = "4.5.23", features = ["derive"] }
+replace_with = "0.1.7"

src/main.rs

@@ -1,7 +1,9 @@
 use clap::{Parser, Subcommand, ValueEnum};
+use std::cell::LazyCell;
 use std::env;
 use std::error::Error;
 use std::fmt::{Display, Formatter};
+use std::ops::Deref;
 use std::path::PathBuf;
 use std::str::FromStr;
 
@@ -63,11 +65,18 @@ enum ServerReference {
 }
 
 impl ServerReference {
-  //TODO lazy resolve method which gets a provider for configured servers
   pub fn resolve(self, configured_servers: &[Server]) -> Option<Server> {
+    self.resolve_lazy(&mut LazyCell::new(|| configured_servers))
+  }
+
+  pub fn resolve_lazy<S, F>(self, provider: &mut LazyCell<S, F>) -> Option<Server>
+  where
+    S: Deref<Target = [Server]>,
+    F: FnOnce() -> S
+  {
     match self {
       ServerReference::Resolved(server) => Some(server),
-      ServerReference::Name(name) => configured_servers
+      ServerReference::Name(name) => provider
         .iter()
         .find(|server| server.ssh_name == name)
         .cloned(),