use std::fs;
use std::error::Error;
use std::env;
pub fn run(config : Config) -> Result<(), Box<dyn Error>>{
let contents = fs::read_to_string(config.file_path)?;
let result = if config.ignore_case {
search_case_insensitive(&config.query, &contents)
} else {
search(&config.query, &contents)
};
for line in result {
println!("{line}");
}
Ok(())
}
pub struct Config {
pub query : String,
pub file_path : String,
pub ignore_case : bool,
}
impl Config {
pub fn build(mut args : impl Iterator<Item = String>) -> Result<Config, &'static str> {
args.next();
let query = match args.next() {
Some(s) => s,
None => return Err("Didn't get a query string")
};
let file_path = match args.next() {
Some(s) => s,
None => return Err("Didn't get a file path")
};
let ignore_case = env::var("IGNORE_CASE").is_ok();
Ok(Config {query, file_path, ignore_case})
}
}
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();
contents.lines().filter(|line| line.to_lowercase().contains(&query)).collect()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn case_sensitive() {
let query = "duct";
let contents = "\
Rust:
safe, fast, productive.
Pick three.";
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));
}
}