♻️ refactor(list): improve max results handling

- change DEFAULT_MAX_RESULTS to const &str for flexibility
- add setter and getter for max_results field

src/list.rs

@@ -10,7 +10,8 @@ use google_gmail1::{
 
 use crate::{Credential, Error};
 
-const DEFAULT_MAX_RESULTS: u32 = 10;
+/// Default for the maximum number of results to return on a page
+pub const DEFAULT_MAX_RESULTS: &str = "10";
 
 /// Struct to capture configuration for List API call.
 pub struct List {
@@ -50,10 +51,20 @@ impl List {
 
         Ok(List {
             hub: Gmail::new(client, auth),
-            max_results: DEFAULT_MAX_RESULTS,
+            max_results: DEFAULT_MAX_RESULTS.parse::<u32>().unwrap(),
         })
     }
 
+    /// Set the maximum results
+    pub fn set_max_results(&mut self, value: u32) {
+        self.max_results = value;
+    }
+
+    /// Report the maximum results value
+    pub fn max_results(&self) -> u32 {
+        self.max_results
+    }
+
     /// Run the Gmail api as configured
     pub async fn run(&self) -> Result<(), Error> {
         let (_response, list) = self