etaa 0.1.0

A Rust tutorials: mix_color and miniquery
Documentation 
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//! # etaa
//! 
//! A library for modeling artistic concepts.

// pub use

pub use self::kinds::PrimaryColor;
pub use self::kinds::SecondaryColor;
pub use self::utils::mix;

pub mod kinds {
    /// The primary colors according to the RYB color model
    pub enum PrimaryColor {
        Red,
        Yellow,
        Blue,
    }

    /// The secondary colors according to the RYB color model.
    pub enum SecondaryColor {
        Orange,
        Green,
        Purple,
    }
}

pub mod utils {
    use crate::kinds::*;

    /// Combine two primary colors in equal amounts to create
    /// a secondary color.
    pub fn mix (c1: PrimaryColor, c2: PrimaryColor ) -> SecondaryColor {
        SecondaryColor::Green
    }
}

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

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

    let contents = fs::read_to_string(config.filename)?;
    let results = if config.case_sensitive{
        search(&config.query, &contents)
    } else {
        search_case_insensitive(&config.query, &contents)
    };

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

pub struct Config {
    pub query: String,
    pub filename: String,
    pub case_sensitive: bool,
}

impl Config {
    pub fn new(mut args: std::env::Args) -> Result<Config, &'static str> {

        args.next();
        let query = match args.next(){
            Some(arg) => arg,
            None => return Err("Didn't get a query string"),
        };
        let filename = match args.next() {
            Some(arg) => arg,
            None => return Err("Didn't get a file name"),
        };
        let case_sensitive = env::var("CASE_INSENSITIVE").is_err();

        Ok(Config{query, filename, case_sensitive})          
    }
}

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> {

    contents.lines().filter(|line| line.to_lowercase().contains(&query)).collect()  

}

#[cfg(test)]
mod tests {
    use super::*;

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