minigrepsv1 0.1.1

minigrepsv1...
Documentation 
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use std::env;
use std::error::Error;
use std::fs;

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);
  }
  // println!("with text:\n{}", contents);
  Ok(())
}

pub struct Config {
  pub query: String,
  pub filename: String,
  pub 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();
    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 filename string!"),
    };
    let case_sensitive = env::var("CASE_SENSITIVE").is_err();

    Ok(Config {
      query,
      filename,
      case_sensitive,
    })
  }
}

pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
  // let mut results = Vec::new();
  // for line in contents.lines() {
  //   if line.contains(query) {
  //     results.push(line);
  //   }
  // }
  // // println!("{:?}", results);
  // results

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

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

  // let query = query.to_lowercase();

  // for line in contents.lines() {
  //   if line.to_lowercase().contains(&query) {
  //     results.push(line);
  //   }
  // }
  // // println!("{:?}", results);
  // results

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

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

  #[test]
  fn one_result() {
    let query = "duct";
    let contents = "\
rust:
dasfasfdasfda duct";
    assert_eq!(vec!["dasfasfdasfda duct"], search(query, contents));
  }

  #[test]
  fn case_sensitive() {
    let query = "duct";
    let contents = "\
rust:
dasfasfdasfda duct
Duct tape";
    assert_eq!(vec!["dasfasfdasfda duct"], search(query, contents));
  }

  #[test]
  fn case_insensitive() {
    let query = "rUst";
    let contents = "\
Rust:
dasfasfdasfda duct
Duct tape
Trust me.";
    assert_eq!(
      vec!["Rust:", "Trust me."],
      search_case_insensitive(query, contents)
    );
  }
}