grafgrep 0.1.1

A super simple grep built for educational purpose
Documentation 
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use std::error::Error;
use std::{fs, env};

pub fn run(config: Config) -> Result<(), Box<dyn Error>>{
    let contents = fs::read_to_string(config.file_path)?;

    let results = if config.ignore_case {
        search_case_insensitive(&config.query, &contents)
    } else {
        search(&config.query, &contents)
    };

    for line in results {
        println!("{line}");
    }
    
    Ok(())

}


/// Perform sensitive search on lines using query parameter in given slice of string and return a vector of found lines.
/// 
/// # Examples
/// 
/// ```
/// use minigrep::search;
/// 
/// let query = "rust";
/// let contents = "\
/// Rust is a must language
/// to uberrust";
/// 
/// 
/// let result = search(&query, &contents);
/// 
/// assert_eq!(vec!["to uberrust"], result);
/// 


pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    contents
        .lines()
        .filter(|line| line.contains(query))
        .collect()
}

pub fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    let query = query.to_lowercase();
    contents
        .lines()
        .filter(|line| line.to_lowercase().contains(&query))
        .collect()
}

pub struct Config {
    pub query: String,
    pub file_path: String,
    pub ignore_case: bool,
}

impl Config {
    pub fn build(mut args: impl Iterator<Item=String>) -> Result<Config, &'static str> {
        args.next();


        let query = match args.next() {
            Some(arg) => arg,
            None => return Err("Didnt get a query string"),
        };


        let file_path = match args.next() {
            Some(arg) => arg,
            None => return Err("Didnt get a file path"),
        };

        let ignore_case = env::var("IGNORE_CASE").is_ok();

        Ok(Config { query: query, file_path: file_path, ignore_case: ignore_case })
    }
}

#[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_insesitive(){
        let query = "rUsT";
        let contents = "\
Rust:
safe, productive, fast.
Pick three.
Trust me.";
        assert_eq!(
            vec!["Rust:", "Trust me."],
            search_case_insensitive(query, contents)
        );
    }
}