Make yup-oauth2 optional

src/generator/templates/Cargo.toml.mako

@@ -58,6 +58,8 @@ path = "../${api_name}"
 version = "${util.crate_version()}"
 % endif
 
-## TODO: Make yup-oauth2 optional
-# [features]
-# default = ["yup-oauth2"]
+% if not cargo.get("is_executable", False):
+[features]
+yup-oauth2 = ["google-apis-common/yup-oauth2"]
+default = ["yup-oauth2"]
+% endif

src/generator/templates/api/api.rs.mako

@@ -31,7 +31,7 @@ use tokio::time::sleep;
 use tower_service;
 use serde::{Serialize, Deserialize};
 
-use crate::{client, client::GetToken, client::oauth2, client::serde_with};
+use crate::{client, client::GetToken, client::serde_with};
 
 // ##############
 // UTILITIES ###

src/generator/templates/api/lib.rs.mako

@@ -49,5 +49,8 @@ pub mod api;
 
 // Re-export the hub type and some basic client structs
 pub use api::${hub_type};
+pub use client::{Result, Error, Delegate, FieldMask};
+
 // Re-export the yup_oauth2 crate, that is required to call some methods of the hub and the client
-pub use client::{Result, Error, Delegate, oauth2, FieldMask};
+#[cfg(feature = "yup-oauth2")]
+pub use client::oauth2;