alex_minigrep/

lib.rs

//! # minigrep Crate
//!
//! `minigrep` is just a simple getting started test project.
//! 

use std::error::Error;
use std::fs::File;
use std::io::prelude::*;
use std::env;

pub fn run(config: Config) -> Result<(), Box<Error>> {
    let mut file = File::open(config.filename)?;
    let mut contents = String::new();
    file.read_to_string(&mut contents)?;


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


/// searches a string and ignores the case 
/// 
/// # Examples
/// 
/// ```
///   let query = "foo";
///   let content = "\
///Hallo Welt,
///Foo Bar,
///";
/// 
/// assert_eq!(vec!["Foo Bar"], minigrep::search_case_insensitive(&query, &content));
/// ```
pub fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    let query = query.to_lowercase();

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

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

impl Config {
    pub fn new(mut args: std::env::Args) -> Result<Config, &'static str> {
        if args.len() < 3 {
            return Err("not enough arguments");
        }

        args.next(); // ignore program name

        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 })
    }
}


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

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

        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)
        );
    }
}