diff --git a/src/lib.rs b/src/lib.rs
index 81a732a..5230770 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,8 @@
 // src/lib.rs
 
 use serde::{Serialize, Deserialize};
+use serde_json;
+use std::fmt;
 
 #[derive(Default, Serialize, Deserialize, PartialEq)]
 enum Semester {
@@ -9,6 +11,15 @@ enum Semester {
     Letny
 }
 
+impl fmt::Display for Semester {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Semester::Zimny => write!(f, "Zimny"),
+            Semester::Letny => write!(f, "Letny"),
+        }
+    }
+}
+
 #[derive(Default, Serialize, Deserialize, PartialEq, Eq, Hash, Copy, Clone)]
 enum TypPovinnosti {
     Povinny,
@@ -17,6 +28,16 @@ enum TypPovinnosti {
     Vyberovy,
 }
 
+impl fmt::Display for TypPovinnosti {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            TypPovinnosti::Povinny => write!(f, "Povinny"),
+            TypPovinnosti::PovinneVoliteny => write!(f, "PovinneVoliteny"),
+            TypPovinnosti::Vyberovy => write!(f, "Vyberovy"),
+        }
+    }
+}
+
 #[derive(Default, Serialize, Deserialize)]
 struct Predmet {
     kod: String,
@@ -30,12 +51,44 @@ struct Predmet {
     typ_povinnosti: TypPovinnosti
 }
 
+impl fmt::Display for Predmet {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "({}, {}, {}, {}, {}, {}, {}, {}, {})",
+               self.kod,
+               self.nazov,
+               self.vyucujuci.join(", "),
+               self.popis,
+               self.semester,
+               self.rocnik,
+               self.pocet_kreditov,
+               self.znamka,
+               self.typ_povinnosti
+        )
+    }
+}
+
 #[derive(Default, Serialize, Deserialize)]
 struct Index {
+    predmety: Vec<Predmet>
 }
 
 impl Index{
+    pub fn nacitaj_zo_suboru(&self, cesta: &std::path::PathBuf) -> Option<Self> {
+        let data = match std::fs::read_to_string(cesta) {
+            Ok(x) => x,
+            Err(_) => return None,
+        };
+        let vysledok = match serde_json::from_str(data.as_str()) {
+            Ok(k) => k,
+            Err(_) => return None,
+        };
+        Some(vysledok)
+    }
 
+    pub fn uloz_do_suboru(&self, cesta_uloz: &std::path::PathBuf) -> bool {
+        true
+
+    }
 }
 
 impl Predmet {