mini_super_grep 0.1.0

//! # minigrep
//!
//! `minigrep` is a collection of utilities to make performing certain
//! calculations more convenient.

use std::error::Error;
use std::fs;


/// Adds one to the number given.
///
/// # Examples
///
/// ```
/// let arg = 5;
/// let answer = minigrep::add_one(arg);
///
/// assert_eq!(6, answer);
/// ```
pub fn add_one(x: i32) -> i32 {
    x + 1
}
pub struct Config {
    pub query: String,
    pub file_path : String,
    pub ignore_case: bool,
}

impl Config {
    pub fn build(args: &[String]) -> Result<Config, &'static str> {
        if args.len() < 3 {
            return Err("not enough arguments");
        }else {
            let query = args[1].clone();
            let file_path = args[2].clone();

            return Ok(Config {query, file_path, ignore_case: false});
        }
    }
}

pub fn run(config: Config) -> Result<(), Box<dyn Error>> {

    println!("{} {}", config.query, config.file_path);


    let contents = fs::read_to_string(config.file_path)?;
    for line in search(&config.query, &contents) {
        println!("{line}")
    }


    Ok(())
}

fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    let mut result = Vec::new();
    for line in contents.lines() {
        if line.contains(query) {
            result.push(line)
        }
    }
    result
}

fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    let query = query.to_lowercase();
    let mut result = Vec::new();
    for line in contents.lines() {
        if line.to_lowercase().contains(&query) {
            result.push(line)
        }
    }
    result
}

#[cfg(test)]
mod tests {

    use super::*;

    #[test]
    fn case_sensitive() {
        let query = "duct";
        let contents = "\
Rust:
safe, fast, productive.
Pick three.
Duct tape.";

        assert_eq!(vec!["safe, fast, productive."], search(query, contents));
    }

    #[test]
    fn case_insensitive() {
        let query = "rUsT";
        let contents = "\
Rust:
safe, fast, productive.
Pick three.
Trust me.";

        assert_eq!(
            vec!["Rust:", "Trust me."],
            search_case_insensitive(query, contents)
        );
    }


}