minigrep_redoca2k/
lib.rs

1use std::error::Error;
2use std::fs;
3use std::env;
4
5pub struct Config {
6    pub query: String,
7    pub filename: String,
8    pub case_sensitive: bool,
9}
10
11impl Config {
12    pub fn new(mut args: env::Args) -> Result<Config, &'static str> {
13        args.next();
14
15        let query = match args.next() {
16            Some(arg) => arg,
17            None => return  Err("Didn't get a query string "),
18        };
19
20        let filename = match args.next() {
21            Some(arg) => arg,
22            None => return Err("Didn't get a file name"),
23        };
24
25        let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
26
27        Ok(Config { query, filename , case_sensitive})
28    }
29}
30
31pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
32    let contents = fs::read_to_string(config.filename)?;
33
34    let results = if config.case_sensitive{
35        search(&config.query, &contents)
36    } else {
37        search_case_insensitive(&config.query, &contents)
38    };
39
40    for line in results {
41        println!("{}",line)
42    }
43    Ok(())
44}
45
46pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
47    contents.lines().filter(|line| line.contains(query)).collect()
48    /* let mut results = Vec::new();
49    for line in contents.lines() {
50        if line.contains(query) {
51            results.push(line);
52        }
53    }
54    results */
55}
56
57pub fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
58    contents.lines().filter(|line| line.to_lowercase().contains(&query.to_lowercase())).collect()
59    /* let query = query.to_lowercase();
60    let mut results = Vec::new();
61
62    for line in contents.lines() {
63        if line.to_lowercase().contains(&query) {
64            results.push(line);
65        }
66    }
67
68    results */
69}
70
71// -------------TESTS------------
72#[cfg(test)]
73mod tests {
74    use super::*;
75
76    #[test]
77    fn case_sensitive() {
78        let query = "duct";
79        let contents = "\
80Rust:
81safe , fast , productive.
82Pick three.";
83        assert_eq!(vec!["safe , fast , productive."], search(query, contents));
84    }
85
86    #[test]
87    fn case_insensitive() {
88        let query = "rUST";
89        let contents = "\
90Rust:
91safe, fast, productive.
92Pick three.
93Trust me.";
94        assert_eq!(
95            vec!["Rust:", "Trust me."],
96            search_case_insensitive(query, contents)
97        );
98    }
99}
minigrep_redoca2k/lib.rs

minigrep_redoca2k/
lib.rs
