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use std::{error::Error, fs, env};
pub struct Config {
pub query: String,
pub file_path: String,
pub ignore_case: bool,
pub case_option: bool,
}
impl Config {
pub fn build(args: &[String]) -> Result<Config, &'static str> {
if args.len() < 4 {
return Err("Not enough arguments");
}
let query = args[1].clone();
let file_path = args[2].clone(); // String
let ignore_case = env::var("IGNORE_CASE").is_ok();
let case_option = match args[3].as_str() {
"true" => true,
&_ => false
};
Ok(Config {query, file_path, ignore_case, case_option})
}
}
// Box<dyn Error> means the function will return a type that implements the Error trait
// But we don’t have to specify what particular type the return value will be
// This gives us flexibility to return error values that may be of different types in different error cases
pub fn run(config: Config) -> Result<(), Box<dyn Error>>{ // dyn dynamic
let contents = fs::read_to_string(config.file_path)?;
let result = if config.ignore_case {
search_case_insensitive(&config.query, &contents)
} else if config.case_option {
search_case_insensitive(&config.query, &contents)
} else {
search(&config.query, &contents)
};
for line in result {
println!("{line}");
}
Ok(())
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn case_sensitive() {
let query = "duct";
let content = "\
Rust:
safe, fast, productive.
Pick three.
Duck tape";
assert_eq!(vec!["safe, fast, productive."], search(query,content));
}
#[test]
fn case_insensitive() {
let query = "rUsT";
let content= "\
Rust:
safe, fast, productive.
Pick three.
Trust me.";
assert_eq!(vec!["Rust:", "Trust me."], search_case_insensitive(query, content));
}
}
pub fn search<'a>(query: &str, content: &'a str) -> Vec<&'a str> {
let mut result = Vec::new();
for line in content.lines() {
if line.contains(query) {
result.push(line);
}
}
result
}
pub fn search_case_insensitive<'a>(query: &str, content: &'a str) -> Vec<&'a str> {
let mut result = Vec::new();
let query = query.to_lowercase();
for line in content.lines() {
if line.to_lowercase().contains(&query) {
result.push(line);
}
}
result
}
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