add ability to update config file, implement debug for Config, and add a utility function

src/lib.rs

@@ -40,6 +40,18 @@ pub fn read_config(file: &String) -> Config {
     serde_json::from_str(&read[..]).expect("couldn't parse config file's json")
 }
 
+pub fn update_latest_date(file: &String, new_date: String) {
+    let mut prevconfig = read_config(file);
+    prevconfig.latest_date = new_date;
+
+    let newconfig = serde_json::to_string(&prevconfig).expect("couldn't serialize json data");
+    fs::write(file.replace('~', &get_home()[..]), newconfig).expect("couldn't write to config file");
+}
+
+pub fn link_to_datestring(link: String) -> String {
+    link.split("=").collect::<Vec<&str>>().pop().unwrap().to_string()
+}
+
 pub fn ensure_exists(path: String) {
     let p = Path::new(&path);
     if !p.exists() {
@@ -47,7 +59,7 @@ pub fn ensure_exists(path: String) {
     }
 }
 
-#[derive(Serialize, Deserialize)]
+#[derive(Serialize, Deserialize, Debug)]
 pub struct Config {
     pub latest_date: String,
     pub cache_folder: String,

src/main.rs

@@ -20,4 +20,6 @@ async fn main() {
 
     let current_page = ggg::get_page(config.latest_date).await;
     println!("{current_page:?}");
+
+    ggg::update_latest_date(&config_file, ggg::link_to_datestring(current_page.next_page.unwrap()));
 }