minigrep_comum_by_rust/
lib.rs

1//! # Examples
2//! 
3//! `its` not works.
4//! Comum example
5
6use std::fs::File;
7use std::io::prelude::*;
8use std::error::Error;
9
10pub struct Config {
11    pub query: String,
12    pub filename: String,
13    pub case_sensitive: bool,
14}
15
16impl Config {
17    pub fn new(mut args: std::env::Args) -> Result<Config, &'static str> {
18        args.next();
19
20        let query = match args.next() {
21            Some(value) => value,
22            None => return Err("query error"), 
23        };
24
25        let filename = match args.next() {
26            Some(value) => value,
27            None => return  Err("filename error"),
28        };
29
30        let case_sensitive = std::env::var("CASE_SENSITIVE").is_err();
31
32        Ok(Config { query, filename, case_sensitive })
33    }
34}
35
36pub fn run(config: Config) -> Result<(),  Box<dyn Error>> {
37    let mut f = File::open(config.filename)?;
38    
39    let mut contents = String::new();
40    f.read_to_string(&mut contents)?;
41
42    let results = if config.case_sensitive {
43        search(&config.query, &contents)
44    }else {
45        search_case_insensitive(&config.query, &contents)
46    };
47
48    for line in results {
49        println!("{}", line);
50    }
51
52    Ok(())
53}
54
55#[cfg(test)]
56mod test {
57    use super::*;
58
59    #[test]
60    fn one_result() {
61        let query = "duct";
62        let contents = "\
63Rust:
64safe, fast, productive.
65Pick theree.
66Duct tape.";
67
68        assert_eq!(
69            vec!["safe, fast, productive."],
70            search(query, contents)
71        );
72    }
73
74    #[test]
75    fn case_insensitive() {
76        let query = "rUsT";
77        let contents = "\
78Rust:
79safe, fast, productive.
80Pick three.
81Trust me.";
82
83        assert_eq!(
84            vec!["Rust:", "Trust me."],
85            search_case_insensitive(query, contents)
86        );
87    }
88}
89
90/// 
91/// # Panics
92/// ```
93/// let value = 'this is so sexy`
94/// ```
95/// # Safe
96/// 
97/// # Error
98pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
99    contents
100        .lines()
101        .filter(|line| line.contains(query))
102        .collect()
103}
104
105fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
106    contents
107        .lines()
108        .filter(|line| line.to_lowercase().contains(&query.to_lowercase()))
109        .collect()
110}
minigrep_comum_by_rust/lib.rs

minigrep_comum_by_rust/
lib.rs
