Add list --json option

src/main.rs

@@ -13,6 +13,12 @@ struct Opts {
     command: Command,
 }
 
+#[derive(Clap, Debug)]
+struct ListOpts {
+    #[clap(short, long)]
+    json: bool,
+}
+
 #[derive(Clap, Debug)]
 struct GetConfigOpts {
     location: String,
@@ -22,7 +28,7 @@ struct GetConfigOpts {
 
 #[derive(Clap, Debug)]
 enum Command {
-    List,
+    List(ListOpts),
     GetConfig(GetConfigOpts),
 }
 
@@ -67,16 +73,20 @@ struct WireguardKeyPair {
 
 fn main() -> Result<(), anyhow::Error> {
     let opts = Opts::parse();
-    match opts.command {
-        Command::List => list()?,
+    match &opts.command {
+        Command::List(list_opts) => list(&list_opts)?,
         Command::GetConfig(get_config_opts) => get_config(&get_config_opts)?,
     }
     Ok(())
 }
 
-fn list() -> Result<(), anyhow::Error> {
+fn list(opts: &ListOpts) -> Result<(), anyhow::Error> {
     let locations: Locations = get_locations()?;
-    println!("{:?}", &locations);
+    if opts.json {
+        println!("{}", serde_json::to_string(&locations)?);
+    } else {
+        println!("{:?}", &locations);
+    }
     Ok(())
 }