Mark security cookie as optional

src/bin.rs

@@ -54,7 +54,7 @@ fn main() {
             (about: "Generates a place or model file out of the project and uploads it to Roblox.")
             (@arg PROJECT: "Path to the project to upload. Defaults to the current directory.")
             (@arg kind: --kind +takes_value "The kind of asset to generate, 'place', or 'model'. Defaults to place.")
-            (@arg cookie: --cookie +takes_value +required "Security cookie to authenticate with.")
+            (@arg cookie: --cookie +takes_value "Security cookie to authenticate with. If not specified, Rojo will attempt to find one from the system automatically.")
             (@arg asset_id: --asset_id +takes_value +required "Asset ID to upload to.")
         )
     );
@@ -172,7 +172,7 @@ fn start_upload(sub_matches: &ArgMatches) {
     };
 
     let kind = sub_matches.value_of("kind");
-    let security_cookie = sub_matches.value_of("cookie").unwrap();
+    let security_cookie = sub_matches.value_of("cookie").map(Into::into);
 
     let asset_id: u64 = {
         let arg = sub_matches.value_of("asset_id").unwrap();
@@ -188,7 +188,7 @@ fn start_upload(sub_matches: &ArgMatches) {
 
     let options = commands::UploadOptions {
         fuzzy_project_path,
-        security_cookie: security_cookie.to_string(),
+        security_cookie: security_cookie,
         asset_id,
         kind,
     };

src/commands/upload.rs

@@ -11,7 +11,7 @@ pub enum UploadError {
 #[derive(Debug)]
 pub struct UploadOptions<'a> {
     pub fuzzy_project_path: PathBuf,
-    pub security_cookie: String,
+    pub security_cookie: Option<String>,
     pub asset_id: u64,
     pub kind: Option<&'a str>,
 }