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use std::{fs, env};
use std::error::Error;
pub struct Config{
pub query: String,
pub filename:String,
pub case_sensitive: bool,
}
impl Config{
pub fn new(args:&[String])-> Result<Config, &'static str> {
if args.len()<3{
return Err("Not enough arguments");
}
let query = args[1].clone();
let filename = args[2].clone();
let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
Ok(Config{query,filename, case_sensitive})
}
}
pub fn run(config: Config) -> Result<(), Box<dyn Error>>{
let contents = fs::read_to_string(config.filename)? ;
let results = if config.case_sensitive {
search(&config.query, &contents)
} else {
search_case_insensitive(&config.query, &contents)
};
for line in results {
println!("{}", line);
}
Ok(())
}
pub fn search<'a>(query:&str, contents:&'a str)->Vec<&'a str> {
contents.lines().filter(|line| {
line.contains(query)
}).collect()
}
pub fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
let query = query.to_lowercase();
let mut results = Vec::new();
for line in contents.lines() {
if line.to_lowercase().contains(&query) {
results.push(line);
}
}
results
}
#[cfg(test)]
mod tests{
use super::*;
#[test]
fn one_result(){
let query = "duct";
let content = "\
Rust:
safe, fast, productive.
Pick three.";
assert_eq!(vec!["safe, fast, productive."],
search(query, content))
}
fn case_sensitive(){
let query = "duct";
let contents = "\
Rust:
safe, fast, productive.
Pick three.
Duct tape.";
assert_eq!(
vec!["safe, fast, productive."],
search(query, contents)
);
}
#[test]
fn case_insensitive() {
let query = "rUsT";
let contents = "\
Rust:
safe, fast, productive.
Pick three.
Trust me.";
assert_eq!(
vec!["Rust:", "Trust me."],
search_case_insensitive(query, contents)
);
}
}