hs_rust_learn/
lib.rs

1//! # rust learn
2//! Test test test...
3//! 哇咔咔咔咔咔
4
5use std::{fs, error::Error, env};
6
7
8pub struct Config {
9    pub query: String,
10    pub filename: String,
11    pub case_sensitive: bool,
12}
13
14impl Config {
15    pub fn new(args: &[String]) -> Result<Config, &'static str> {
16        if args.len() < 3{
17            return Err("not enough arguments");
18        }
19        let str = &args[1];
20        let file = &args[2];
21        let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
22        println!("{} at {}", str, file);
23    
24        Ok(Config {
25            query: str.to_string(),
26            filename: file.to_string(),
27            case_sensitive,
28        })
29    }
30}
31
32
33pub fn find_query_in_file(config: &Config) -> Result<(), Box<dyn Error>> {
34    let contents = 
35        fs::read_to_string(&config.filename)?;
36    println!("With text:\n{}", contents);
37    if config.case_sensitive {
38        for line in search(&config.query, &contents) {
39            println!("{}", line);
40        }
41    } else {
42        for line in search_case_insensitive(&config.query, &contents) {
43            println!("{}", line);
44        }
45    }
46    
47    Ok(())
48}
49
50pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
51    contents.lines()
52        .filter(|line| line.contains(query))
53        .collect()
54}
55
56/// 不区分大小写搜索
57/// # Examples
58/// 
59/// ```
60/// let query = "rUsT";
61/// let contents = "\
62/// Rust:
63/// safe, fast, productive.
64/// Pick three.
65/// Trust me.";
66/// assert_eq!(
67///     vec!["Rust:", "Trust me."],
68///     search_case_insensitive(query, contents)
69/// );
70/// ```
71pub fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
72    let lowercase_query = query.to_lowercase();
73    contents.lines()
74        .filter(|line| line.to_lowercase().contains(&lowercase_query))
75        .collect()
76}
77
78#[cfg(test)]
79mod test {
80    use super::*;
81
82    #[test]
83    fn test_search() {
84        let query = "duct";
85        let contents = "\
86Rust:
87safe, fast, productive.
88Pick three.";
89        assert_eq!(
90            vec!["safe, fast, productive."],
91            search(query, contents)
92        );
93    }
94
95    #[test]
96    fn test_search_case_insensitive() {
97        let query = "rUsT";
98        let contents = "\
99Rust:
100safe, fast, productive.
101Pick three.
102Trust me.";
103        assert_eq!(
104            vec!["Rust:", "Trust me."],
105            search_case_insensitive(query, contents)
106        );
107    }
108}
hs_rust_learn/lib.rs

hs_rust_learn/
lib.rs
