mirror of https://github.com/KaiserY/trpl-zh-cn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.1 KiB
61 lines
1.1 KiB
3 years ago
|
use std::error::Error;
|
||
|
|
use std::fs;
|
||
|
|
|
||
|
|
pub struct Config {
|
||
|
|
pub query: String,
|
||
|
|
pub filename: String,
|
||
|
|
}
|
||
|
|
|
||
|
|
impl Config {
|
||
|
|
pub fn new(args: &[String]) -> Result<Config, &'static str> {
|
||
|
|
if args.len() < 3 {
|
||
|
|
return Err("not enough arguments");
|
||
|
|
}
|
||
|
|
|
||
|
|
let query = args[1].clone();
|
||
|
|
let filename = args[2].clone();
|
||
|
|
|
||
|
|
Ok(Config { query, filename })
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// ANCHOR: here
|
||
|
|
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(())
|
||
|
|
}
|
||
|
|
// ANCHOR_END: here
|
||
|
|
|
||
|
|
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
|
||
|
|
}
|
||
|
|
|
||
|
|
#[cfg(test)]
|
||
|
|
mod tests {
|
||
|
|
use super::*;
|
||
|
|
|
||
|
|
#[test]
|
||
|
|
fn one_result() {
|
||
|
|
let query = "duct";
|
||
|
|
let contents = "\
|
||
|
|
Rust:
|
||
|
|
safe, fast, productive.
|
||
|
|
Pick three.";
|
||
|
|
|
||
|
|
assert_eq!(vec!["safe, fast, productive."], search(query, contents));
|
||
|
|
}
|
||
|
|
}
|