使用 Rust 實作「電子鐘」應用程式

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建立專案

建立專案。

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cargo new rust-digital-clock
cd rust-digital-clock

修改 Cargo.toml 檔，安裝依賴套件。

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[dependencies]
chrono = "0.4"

實作

修改 main.rs 檔。

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use std::time::Duration;

use chrono::Local;

#[rustfmt::skip]
const DIGITS : [[&str; 11]; 7] = [
    ["┏━┓ ","  ╻  "," ┏━┓ ", " ┏━┓ "," ╻ ╻ "," ┏━┓ "," ┏   "," ┏━┓ "," ┏━┓ "," ┏━┓ ","   "],
    ["┃ ┃ ","  ┃  ","   ┃ ", "   ┃ "," ┃ ┃ "," ┃   "," ┃   ","   ┃ "," ┃ ┃ "," ┃ ┃ "," ╻ "],
    ["┃ ┃ ","  ┃  ","   ┃ ", "   ┃ "," ┃ ┃ "," ┃   "," ┃   ","   ┃ "," ┃ ┃ "," ┃ ┃ ","   "],
    ["┃ ┃ ","  ┃  "," ┏━┛ ", " ┣━┫ "," ┗━┫ "," ┗━┓ "," ┣━┓ ","   ┃ "," ┣━┫ "," ┗━┫ ","   "],
    ["┃ ┃ ","  ┃  "," ┃   ", "   ┃ ","   ┃ ","   ┃ "," ┃ ┃ ","   ┃ "," ┃ ┃ ","   ┃ ","   "],
    ["┃ ┃ ","  ┃  "," ┃   ", "   ┃ ","   ┃ ","   ┃ "," ┃ ┃ ","   ┃ "," ┃ ┃ ","   ┃ "," ╹ "],
    ["┗━┛ ","  ╹  "," ┗━━ ", " ┗━┛ ","   ╹ "," ┗━┛ "," ┗━┛ ","   ╹ "," ┗━┛ "," ┗━┛ ","   "],
];

fn main() {
    loop {
        // 清除畫面
        std::process::Command::new("clear").status().unwrap();
        // 當前時間
        let time = Local::now().format("%H:%M:%S").to_string();
        for row in &DIGITS {
            // 判讀時間
            for c in time.chars() {
                // 決定索引
                let col = match c {
                    '0'..='9' => c as usize - '0' as usize,
                    ':' => 10,
                    _ => 10,
                };
                // 印出數字
                print!("{} ", row[col]);
            }
            // 換行
            println!();
        }
        // 等待
        std::thread::sleep(Duration::from_millis(1000))
    }
}

啟動程式。

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cargo run

程式碼

參考資料