rust_test_123 0.1.1

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

use std::env;
use std::error::Error;
use std::fs;
extern crate indoc;

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: 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,
        })

        // if args.len() < 3 {
        //     return Err("not enough arguments");
        // }

        // let query = args[1].clone();
        // let filename = args[2].clone();
        // let case_sensitive = if args.len() > 3 {
        //     args[3].to_lowercase() == "true"
        // } else {
        //     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()

    // let mut results = vec![];

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

    // results
}

/// Adds one to the number given.
///
/// # Examples
///
/// ```
///     use rust_grep::*;
///     let query = "duct";
///     let contents = indoc::indoc!(
///         "\
///         Rust:
///         safe, fast, productive.
///         Pick three.
///         Duct tape."
///     );
///     assert_eq!(vec!["safe, fast, productive."], search(query, contents));
/// ```
///
/// # Panics
/// whatever
///
/// # Errors
/// Something here
///
/// # Safety
/// more stuff
pub fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    contents
        .lines()
        .filter(|line| line.to_lowercase().contains(&query.to_lowercase()))
        .collect()

    // 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
}

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

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

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