minigrep_xiangwei/
lib.rs

1
2//! # My Crate
3//!
4//! `my_crate` is a collection of utilities to make performing certain
5//! calculations more convenient.
6
7
8use std::env;
9use std::error::Error;
10use std::fs;
11
12pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
13    let contents = fs::read_to_string(config.file_path)?;
14    let results = if config.ignore_case {
15        search_case_insensitive(&config.query, &contents)
16    } else {
17        search(&config.query, &contents)
18    };
19    for line in results {
20        println!("{line}");
21    }
22    Ok(())
23}
24
25pub struct Config {
26    pub query: String,
27    pub file_path: String,
28    pub ignore_case: bool,
29}
30
31impl Config {
32    pub fn new(mut args: impl Iterator<Item = String>) -> Result<Config, &'static str> {
33        args.next();
34
35        let query = match args.next() {
36            Some(arg) => arg,
37            None => return Err("dont get a query string"),
38        };
39        let file_path = match args.next() {
40            Some(arg) => arg,
41            None => return Err("dont get a file path"),
42        };
43
44        let ignore_case = env::var("IGNORE_CASE").is_ok();
45
46        Ok(Config {
47            query,
48            file_path,
49            ignore_case,
50        })
51    }
52}
53
54
55
56
57
58///hello
59/// 
60/// ```
61///  use minigrep::search;
62/// let query="the";
63/// let contents="my world 
64/// the world";
65/// let a = search(query,contents);
66/// assert_eq!(vec!["the world"],a);
67/// ```
68pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
69    contents
70        .lines()
71        .filter(|line| line.contains(query))
72        .collect()
73}
74
75pub fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
76    let query = query.to_lowercase();
77    let mut results = Vec::new();
78
79    for line in contents.lines() {
80        if line.to_lowercase().contains(&query) {
81            results.push(line);
82        }
83    }
84
85    results
86}
87
minigrep_xiangwei/lib.rs

minigrep_xiangwei/
lib.rs
