zhouchen 0.1.0

use std::error::Error;
use std::{env, fs};
pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
    let contents = fs::read_to_string(config.filename)?;
    for line in search(&config.query, &contents) {
        println!("{}", line);
    }
    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("输入错误");
        }
        args.next();
        let query = match args.next() {
            Some(arg) => arg,
            None => return Err("查找的内容不存在"),
        };
        let filename = match args.next() {
            Some(arg) => arg,
            None => return Err("文件不存在"),
        };
        let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
        Ok(Config {
            query,
            filename,
            case_sensitive: 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);
        }
    }
    results*/
    contents
        .lines()
        .filter(|line| line.contains(query))
        .collect()
}
#[cfg(test)]
mod tests {
    use crate::*;
    #[test]
    fn one_result() {
        let query = "satf";
        let contents = "\
        Ruest:
        satf,faf
        ";
        let search = search(query, contents);
        assert_eq!(vec!["satf"], search(query, contents));
    }
}