RUST EXCERCISE - STORE TEXT IN TEXT FILE

 STORE TEXT IN TEXT FILE

EXCERCISE: 

• Storing text in a text file.

SOLUTION:

• Create a new binary package called notes:

• cargo run --build notes

• Add rust analyser to vscode settings.json.
• Go to crates.io, search for chrono.
• Copy their version and paste it in cargo.toml.

• chrono = "0.4.23"
  

• Run cargo-watch with a parameter YOUR NOTES passed into it:

• cargo-watch -qc -x 'run -- "YOUR NOTE"' -i "notes.txt" -x clippy

• The above command makes sure not to rerun your code again and again whenever there is a change in notes.txt.

• #![deny(clippy::all)]
  use std::env;
  use std::fs::OpenOptions;
  use std::io::prelude::*;
  use std::process;
  
  fn main() -> Result<(), Box<dyn std::error::Error>> {
    let args: Vec<String> = env::args().collect();
    if args.len() < 2 {
      Err("Usage: notes your_note_goes_here")?;
      process::exit(1);
    }
    let notes = args[1].clone();
    let now = chrono::Local::now().format("%Y-%m-%d").to_string();
    let mut file = OpenOptions::new()
        .create(true)
        .write(true)
        .append(true)
        .open("notes.txt")
        .unwrap();
    file.write_all(b"<!--")?;
    file.write_all(now.as_bytes())?;
    file.write_all(b"-->\n")?;
    file.write_all(notes.as_bytes())?;
    file.write_all(b"\n\n")?;
    Ok(())
  }