aolifu_rust/
command.rs

1use std::{env, fs, process};
2use std::error::Error;
3
4pub fn read_command_line_arg() {
5    let args: Vec<String> = env::args().collect();
6    println!("{:?}", args);
7
8    let config = Config::New(&args).unwrap_or_else(|err| {
9        println!("Problem parsing arguments: {}", err);
10        process::exit(1);
11    });
12
13   if let Err(e) = run(config) {
14       eprintln!("Application error: {}", e);
15       process::exit(1);
16   }
17
18}
19
20pub fn read_command_line_arg_two() {
21    let config = Config::New_two(env::args()).unwrap_or_else(|err| {
22        println!("Problem parsing arguments: {}", err);
23        process::exit(1);
24    });
25
26    if let Err(e) = run(config) {
27        eprintln!("Application error: {}", e);
28        process::exit(1);
29    }
30
31}
32
33struct Config {
34    query: String,
35    fileName: String,
36    case_insensitive: bool,
37}
38
39impl Config {
40    fn New(args: &[String]) -> Result<Config, &'static str> {
41        if args.len() < 3 {
42            return Err("not enough arguments");
43        }
44        let query = args[1].clone();
45        let fileName = args[2].clone();
46        let case_insensitive = env::var("CASE_INSENSITIVE").is_err();
47        Ok(Config {
48            query, fileName, case_insensitive
49        })
50    }
51
52    fn New_two(mut args: std::env::Args) -> Result<Config, &'static str> {
53        if args.len() < 3 {
54            return Err("not enough arguments");
55        }
56        args.next();
57        let query = match args.next() {
58            Some(arg) => arg,
59            None => return Err("Didn't get a query String"),
60        };
61        let fileName = match args.next(){
62            Some(arg) => arg,
63            None => return Err("Didn't get a file name")
64        };
65        let case_insensitive = env::var("CASE_INSENSITIVE").is_err();
66        Ok(Config {
67            query, fileName, case_insensitive
68        })
69    }
70}
71
72fn run(config: Config) -> Result<(), Box<dyn Error>> {
73    let content = fs::read_to_string(config.fileName)?;
74    println!("content value is {}", content);
75    let result = if config.case_insensitive {
76        search(&config.query, &content)
77    } else {
78        search_case_insensitive(&config.query, &content)
79    };
80    for line in result {
81        println!("line : {}", line);
82    }
83    Ok(())
84}
85
86pub fn search<'a> (query: &str, content: &'a str) -> Vec<&'a str> {
87    let mut result = Vec::new();
88    for line in content.lines() {
89        if line.contains(query) {
90            result.push(line);
91        }
92    }
93    result
94}
95
96pub fn search_two<'a> (query: &str, content: &'a str) -> Vec<&'a str> {
97    content.lines().filter(|line| line.contains(query)).collect()
98}
99
100pub fn search_case_insensitive<'a>(query: &str, content: &'a str) -> Vec<&'a str> {
101    let mut result = Vec::new();
102    let query = query.to_lowercase();
103    for line in content.lines() {
104        if line.to_lowercase().contains(&query) {
105            result.push(line);
106        }
107    }
108    result
109}
aolifu_rust/command.rs

aolifu_rust/
command.rs
