minigrep3 0.1.0

barebone mini grep
Documentation 
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use std::{env, fs, io};
#[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)
        );
    }
}
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 fn run(config: Config) -> Result<(), io::Error> {
    let contents = fs::read_to_string(config.file_path)?;
    let result = if config.ignore_case {
        search_case_insensitive(&config.query, &contents)
    } else {
        search(&config.query, &contents)
    };
    for (i, line) in result.iter().enumerate() {
        println!("{}: {}", i, line);
    }
    Ok(())
}

pub struct Config {
    query: String,
    file_path: String,
    ignore_case: bool,
}
impl Config {
    pub fn build<T>(mut args: T) -> Result<Config, &'static str>
    where
        T: Iterator<Item = String>,
    {
        args.next();
        let query = match args.next() {
            Some(arg) => arg,
            None => return Err("Didn't get a query string"),
        };
        let file_path = match args.next() {
            Some(arg) => arg,
            None => return Err("Didn't get a file path"),
        };
        // match args.next() {}
        // if args.len() < 3 {
        //     // return Err(&args[0]);
        //     return Err("Not enough arguments");
        // }
        // let query = args[1].clone();
        // let file_path = args[2].clone();
        let ignore_case = env::var("IGNORE_CASE").is_ok();
        Ok(Config {
            query,
            file_path,
            ignore_case,
        })
    }
}