Add simple IO read write

Author: buraksenyurt

fops/src/data.rs

@@ -0,0 +1,86 @@
+use crate::game::Game;
+
+pub fn load_games() -> Vec<Game> {
+    vec![
+        Game {
+            title: String::from("The Legend of Zelda: Breath of the Wild"),
+            year: 2017,
+            popularity: 1.5,
+        },
+        Game {
+            title: String::from("Half-Life 2"),
+            year: 2004,
+            popularity: 1.6,
+        },
+        Game {
+            title: String::from("The Witcher 3: Wild Hunt"),
+            year: 2015,
+            popularity: 1.8,
+        },
+        Game {
+            title: String::from("Dark Souls"),
+            year: 2011,
+            popularity: 1.1,
+        },
+        Game {
+            title: String::from("God of War"),
+            year: 2018,
+            popularity: 1.25,
+        },
+        Game {
+            title: String::from("Super Mario Odyssey"),
+            year: 2017,
+            popularity: 1.9,
+        },
+        Game {
+            title: String::from("Hades"),
+            year: 2020,
+            popularity: 2.8,
+        },
+        Game {
+            title: String::from("Resident Evil 4"),
+            year: 2005,
+            popularity: 0.9,
+        },
+        Game {
+            title: String::from("Minecraft"),
+            year: 2009,
+            popularity: 2.73,
+        },
+        Game {
+            title: String::from("Overwatch"),
+            year: 2016,
+            popularity: 1.25,
+        },
+        Game {
+            title: String::from("Grand Theft Auto V"),
+            year: 2013,
+            popularity: 1.1,
+        },
+        Game {
+            title: String::from("Animal Crossing: New Horizons"),
+            year: 2020,
+            popularity: 1.4,
+        },
+        Game {
+            title: String::from("Elden Ring"),
+            year: 2022,
+            popularity: 2.98,
+        },
+        Game {
+            title: String::from("Bloodborne"),
+            year: 2015,
+            popularity: 1.12,
+        },
+        Game {
+            title: String::from("Sekiro: Shadows Die Twice"),
+            year: 2019,
+            popularity: 0.78,
+        },
+        Game {
+            title: String::from("Mass Effect 2"),
+            year: 2010,
+            popularity: 1.98,
+        },
+    ]
+}

fops/src/game.rs

@@ -1,6 +1,14 @@
+use std::fmt::Display;
+
 #[derive(Debug)]
 pub struct Game {
-    title: String,
-    release_year: u16,
-    genre: String,
+    pub title: String,
+    pub year: u16,
+    pub popularity: f32,
+}
+
+impl Display for Game {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(f, "{}|{}|{}", self.title, self.year, self.popularity)
+    }
 }

fops/src/io_ops.rs

@@ -1,5 +1,7 @@
+use crate::game::Game;
+use std::fs::File;
 use std::io;
-use std::io::{Write, stdout};
+use std::io::{BufRead, Write, stdout};
 /*
     Bu fonksiyon stdin yardımıyla bilgi okur.
     Örneğin terminalden oyun bilgisi girilebilir.
@@ -21,3 +23,31 @@ pub fn print_games_to_stdout(games: &[String]) {
 
     stdout().write_all(games.join("\n").as_bytes()).unwrap();
 }
+
+/*
+    Bu metot games.dat isimli bir dosyaya, parametre olarak gelen oyunlara ait bilgileri
+    yazar.
+*/
+pub fn write_games_to_file(games: &[Game]) -> io::Result<()> {
+    let mut contents = String::new();
+    for g in games {
+        contents.push_str(&g.to_string());
+        contents.push_str("\n");
+    }
+    let mut f = File::create("games.dat")?;
+    f.write_all(contents.as_bytes())?;
+    Ok(())
+}
+
+/*
+    Bu metot games.dat dosyasındaki satırları okuyup geriye String türünden değerler içeren
+    bir vektör döndürür.
+*/
+pub fn read_games_from_file() -> io::Result<Vec<String>> {
+    let mut games = Vec::new();
+    let f = File::open("games.dat")?;
+    for line in io::BufReader::new(f).lines() {
+        games.push(line?);
+    }
+    Ok(games)
+}

fops/src/main.rs

@@ -1,5 +1,7 @@
+use crate::data::load_games;
 use crate::io_ops::*;
 
+mod data;
 mod game;
 mod io_ops;
 
@@ -15,5 +17,12 @@ fn main() -> std::io::Result<()> {
     classic_games.push(new_game);
     print_games_to_stdout(&classic_games);
 
+    let games = load_games();
+    write_games_to_file(&games)?;
+    let games = read_games_from_file()?;
+    for game in games {
+        println!("{}", game);
+    }
+
     Ok(())
 }