mj_minigrep 0.1.6

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

/// Adds one to the number given.
// --snip--

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

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

pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
    let contents: String = 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(())
}

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

pub fn search_case_insensitive<'a>(
    query: &str,
    contents: &'a str,
) -> Vec<&'a str> {
    let query = query.to_lowercase();
    let mut results = Vec::new();

    for line in contents.lines() {
        if line.to_lowercase().contains(&query) {
            results.push(line);
        }
    }

    results
}

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("Didn't get a query string"),
        };

        let file_path: String = match args.next() {
            Some(args) => args,
            None => return Err("Didn't get a file path string"),
        };

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

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

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

    #[test]
    fn case_sentitive() {
        let query = "hello";
        let contents = "\
        Rust:\
        Safe, fast, productive.\
        Pick one";

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

    #[test]
    fn case_insentitive() {
        let query = "hello";
        let contents = "\
        Rust:\
        Safe, fast, productive.\
        Pick one";

        assert_eq!(vec!["Safe, Fast, Productive."], search(query, contents));
    }
}


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::*;

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