brcap 0.1.0

A helper cli (Command line interface) to improve work with aws features inside the company domain
Documentation 
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use std::{env, error::Error, fs};

const CASE_INSENSITIVE: &str = "CASE_INSENSITIVE";

#[derive(Debug, PartialEq)]
pub struct Config {
    query: String,
    filename: String,
    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"),
        }; // clone is not idiomatic in most cases
        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: query,
            filename: filename,
            case_sensitive,
        })
    }
}

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)
    };

    results.iter().for_each(|line| println!("{}", line));

    Ok(())
}

/// Searches into some content(text) by an specifc query provided
///
/// # Examples
/// ```
/// let query = "World";
/// let contents = "Welcome back into!\n
/// Do not be afraid!\n
/// That is my World!";
///
/// let line_matches: Vec<&str> = brcap::search(query, contents);
///
/// assert_eq!(vec!["That is my World!"], line_matches);
/// ```
pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    contents
        .lines()
        .map(|line| line.trim())
        .filter(|line| line.contains(query))
        .collect()
}

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

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

    #[test]
    fn it_instantiate_config_passing_args() {
        let args = env::args();

        let expected_config = Config {
            query: String::from("search term"),
            filename: String::from("filename to search"),
            case_sensitive: true,
        };

        if let Ok(config) = Config::new(args) {
            assert_eq!(config, expected_config);
        }
    }

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

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

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

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