minigrep0101/
lib.rs

1use std::fs;
2use std::error::Error;
3use std::env;
4
5pub fn run(config:&Config)->Result<(), Box<dyn Error>> {
6    let contents = fs::read_to_string(&config.filename)?;
7    if config.case_sensitive{ 
8        for line in search(&config.query, &contents) {
9            println!("{}", line);
10        }
11    }
12    else{
13        for line in search_case_insensitive(&config.query, &contents) {
14            println!("{}", line);
15        }
16    }
17    Ok(())
18}
19
20pub struct Config {
21    pub query: String,
22    pub filename: String,
23    pub case_sensitive:bool,
24}
25
26impl Config {
27    pub fn new(mut args: std::env::Args)->Result<Config,&'static str>{
28        if args.len() < 3 {
29            return Err("Not enough arguement");
30        }
31        args.next();
32        let query = match args.next(){
33            Some(arg) => arg,
34            None => return Err("Didn't get a query string"),
35        };
36        let filename = match args.next(){
37            Some(arg) => arg,
38            None => return Err("Didn't get a query string"),
39        };
40        let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
41        return Ok(Config { query, filename,case_sensitive })
42    }
43}
44
45
46pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
47    contents.lines()
48        .filter(|line| line.contains(query))
49        .collect()
50}
51pub fn search_case_insensitive<'a>(query: &str,contents: &'a str) ->Vec<&'a str>{
52    let query = query.to_lowercase();
53    contents.lines()
54        .filter(|line| line.to_lowercase().contains(&query))
55        .collect()
56}
57#[cfg(test)]
58mod tests {
59    use super::*;
60
61    #[test]
62    fn case_insensitive(){
63        let query = "rUsT";
64        let contents = "\
65Rust:
66safe, fast, productive.
67Pick three.
68Trust me.";
69
70        assert_eq!(
71            vec!["Rust:", "Trust me."],
72            search_case_insensitive(query, contents)
73        );
74    }
75    #[test]
76    fn case_sensitive(){
77        let query = "duct";
78        let contents = "\
79Rust:
80safe, fast, productive.
81Pick three.
82Duct tape.";
83
84        assert_eq!(
85            vec!["safe, fast, productive."],
86            search(query, contents)
87        );
88    }
89
90}
91
92
93
94
minigrep0101/lib.rs

minigrep0101/
lib.rs
