Add the modification time to the List struct

src/list.rs

@@ -4,12 +4,14 @@ use inflector::Inflector;
 use std::fs::File;
 use std::io::prelude::*;
 use std::path::PathBuf;
+use std::time::SystemTime;
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct List {
     pub id: String,
     pub index: i8,
     pub data: String,
+    pub mtime: SystemTime,
     pub name: String,
     path: PathBuf
 }
@@ -21,13 +23,16 @@ impl List {
     }
 
     pub fn update_data(&mut self, data : &String) {
-        self.data = data.clone();
         let mut file = File::create(&self.path)
             .expect(&format!("Cannot open list file {}",
                 self.path.to_str().unwrap()));
         file.write_all(data.as_bytes())
             .expect(&format!("Cannot write list file {}",
                 self.path.to_str().unwrap()));
+
+        self.data = data.clone();
+        let metadata = file.metadata().unwrap();
+        self.mtime = metadata.modified().unwrap();
     }
 
     pub fn load_all() -> Vec<Self> {
@@ -44,11 +49,14 @@ impl List {
                 .expect(&format!("Cannot open list file {}", file_name));
             file.read_to_string(&mut data)
                 .expect(&format!("Cannot read list file {}", file_name));
+            let metadata = file.metadata()
+                .expect(&format!("Cannot get metadata of list file {}", file_name));
 
             let mut list = List {
                 id: String::from(name),
                 index : index,
                 data: data,
+                mtime: metadata.modified().unwrap(),
                 name: String::from(name).to_title_case(),
                 path: entry.clone()
             };