rust_cli_tool_grrs 0.1.0

A tool to read files
Documentation 
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use anyhow::{Context, Result};
use clap::Parser;
//eprintln() prints error messages i.e to stderr
//println!() prints to stdout

/// Search for a pattern in a file and display the lines that contain it.
#[derive(Parser)]
struct Cli {
    /// The pattern to look for
    pattern: String,
    /// The path to the file to read
    path: std::path::PathBuf,
}


fn main() -> Result<()> {
    let args = Cli::parse();

    let content = std::fs::read_to_string(&args.path)
        .with_context(|| format!("could not read file `{}`", args.path.display()))?;

    rust_cli_tool_grrs::find_matches(&content, &args.pattern, &mut std::io::stdout());
    Ok(())
}

#[test]
fn find_a_match() {
    let mut result = Vec::new();
    rust_cli_tool_grrs::find_matches("lorem ipsum\ndolor si amet", "lorem", &mut result);
    assert_eq!(result, b"lorem ipsum\n");
}