learn_rust_idiot/
lib.rs

1
2#![allow(non_snake_case)]
3
4use std::fs;
5use std::error::Error;
6use std::env;
7
8pub fn Run(config: Config) -> Result<(), Box<dyn Error>> {
9    let contents = fs::read_to_string(config.file_name)?;
10
11    let result = if config.case_sensitive{
12        Search(&config.query, &contents)
13    }
14    else{
15        SearchCaseInsensitive(&config.query, &contents)
16    };
17
18    for line in Search(&config.query, &contents){
19        println!("{}", line)
20    }
21
22    Ok(())
23}
24
25pub struct Config {
26    pub query: String,
27    pub file_name: String,
28    pub case_sensitive: bool,
29}
30
31impl Config {
32    pub fn build(mut args: env::Args) -> Result<Config, &'static str> {
33
34        args.next();
35
36        let query = match args.next() {
37            Some(Arg) => Arg,
38            None => return Err("Invalid query string"),
39
40        };
41
42        let file_name = match args.next() {
43            Some(Arg) => Arg,
44            None => return Err("Invalid file  string"),
45            
46        };
47
48        let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
49
50        Ok(Config { query, file_name, case_sensitive })
51    }
52}
53
54pub fn Search<'a>(query: &str, contents : &'a str) -> Vec<&'a str> {
55    contents
56    .lines()
57    .filter(|line| line.contains(query))
58    .collect()
59    
60}       
61
62pub fn SearchCaseInsensitive<'a>(
63    query: &str,
64    contents : &'a str,
65) -> Vec<&'a str> {
66    let query = query.to_lowercase();
67    let mut results = Vec::new();
68
69    for  line in contents.lines() {
70        if line.to_lowercase().contains(&query){
71            results.push(line);
72        }
73    }
74
75    results
76
77}
78
79#[cfg(test)]
80mod tests {
81    use super::*;
82
83    #[test]
84    fn case_sensitive() {
85        let query = "duct";
86        let contents = "\
87Rust:
88safe, fast, productive.
89Pick three.
90Duct tape.";
91
92        assert_eq!(vec!["safe, fast, productive."], Search(query, contents));
93    }
94
95    #[test]
96    fn case_insensitive() {
97        let query = "rUsT";
98        let contents = "\
99Rust:
100safe, fast, productive.
101Pick three.
102Trust me.";
103
104        assert_eq!(
105            vec!["Rust:", "Trust me."],
106            SearchCaseInsensitive(query, contents)
107        );
108    }
109
110}
learn_rust_idiot/lib.rs

learn_rust_idiot/
lib.rs
