mmgrep 0.1.0

A tool for search in files.
Documentation 
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use std::error::Error;
use std::{env, fs};

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> {
        //ignore first value because its program name
        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"),
        };
        let ignore_case = env::var("IGNORE_CASE").is_ok();
        Ok(Config {
            file_path,
            query,
            ignore_case,
        })
    }
}

pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
    let content = fs::read_to_string(config.file_path)?;

    let results = if config.ignore_case {
        search_case_insensitive(&config.query, &content)
    } else {
        search(&config.query, &content)
    };

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

    Ok(())
}
///Search (case sensitive) query in given content
///
/// # Examples
///
///```
/// use mmgrep:: search_case_insensitive;
/// let query = "rUst";
/// let content = "/
///Rust:
///safe, fast, productive.
///Pick three.
///Trust me.";
/// assert_eq!(vec!["Rust:", "Trust me."], search_case_insensitive(query, content))
/// ```
pub fn search<'a>(query: &'a str, content: &'a str) -> Vec<&'a str> {
    content
        .lines()
        .filter(|line| line.contains(query))
        .collect()
}

///Search (case insensitive) query in given content
///
/// # Examples
///
///```
/// use mmgrep::search;
/// let query = "duct";
/// let content = "/
///Rust:
///safe, fast, productive.
///Pick three.";
/// assert_eq!(vec!["safe, fast, productive."], search(query, content))
/// ```
pub fn search_case_insensitive<'a>(query: &'a str, content: &'a str) -> Vec<&'a str> {
    let query = query.to_lowercase();
    let mut results = Vec::new();
    for line in content.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 content = "\
Rust:
safe, fast, productive.
Pick three.";
        assert_eq!(vec!["safe, fast, productive."], search(query, content))
    }

    #[test]
    fn case_insensitive() {
        let query = "rUsT";
        let content = "\
Rust:
safe, fast, productive.
Pick three.
Trust me.";
        assert_eq!(
            vec!["Rust:", "Trust me."],
            search_case_insensitive(query, content)
        )
    }
}