liqiqi_minigrep/
lib.rs

1use std::error::Error;
2use std::{env, fs};
3
4pub struct Config{
5    pub query:String,
6    pub filename:String,
7    pub case_sensitive:bool,
8}
9
10impl Config{
11    pub fn new(args: &[String]) -> Result<Config,&'static str>{
12        if args.len()<3{
13            return Err("not enough arguments");
14        }
15        let query=args[1].clone();
16        let filename=args[2].clone();
17        let case_sensitive=env::var("insensitive").is_err();
18        Ok(Config{query,filename,case_sensitive})
19    }
20}
21
22pub fn run(config:Config) -> Result<(),Box<dyn Error>>{
23    let contents= fs::read_to_string(config.filename)?;
24    // println!("With text:{}",contents);
25    let results=if config.case_sensitive {
26        search(&config.query, &contents)
27    }else{
28        search_case_insensitive(&config.query, &contents)
29    };
30    for line in results{
31        println!("{}",line);
32    }
33    Ok(())
34}
35
36#[cfg(test)]
37mod tests {
38    use super::*;
39    #[test]
40    fn one_result(){
41        let query="duct";
42        let contents= "\
43Rust:
44safe,fast,productive.
45Pick three.";
46        assert_eq!(vec!["safe,fast,productive."],search(query,contents));
47    }
48}
49
50pub fn search<'a>(query:&str,contents:&'a str) -> Vec<&'a str>{
51    let mut results=Vec::new();
52    for line in contents.lines(){
53        if line.contains(query){
54            results.push(line);
55        }
56    }
57    results
58}
59
60pub fn search_case_insensitive<'a>(query:&str,contents:&'a str) -> Vec<&'a str>{
61    let query=query.to_lowercase();
62    contents.lines().filter(|line| line.to_lowercase().contains(&query)).collect()
63}
liqiqi_minigrep/lib.rs

liqiqi_minigrep/
lib.rs
