use std::error::Error;
pub fn run(config: Config) -> Result<(),Box<dyn Error>> {
let contents = std::fs::read_to_string(config.file_path)?;
let result:Vec<&str> = if !config.ignore_case{
search(&config.query, &contents)
}else {
search_case(&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(arg) => arg,
None => return Err("Didn't get a query string"),
};
let file_path = match args.next() {
Some(arg) => arg,
None => return Err("Didn't get a file name"),
};
let ignore_case = std::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<'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 one_result() {
let query = "duct";
let contents = "\
Rust:
safe, fast, productive.
Pick three.";
assert_eq!(vec!["safe, fast, productive."],search(query, contents));
}
#[test]
fn case_sensitive() {
let query = "rUst";
let contents = "\
Rust:
safe, fast, productive.
Pick three.
rust";
assert_eq!(vec!["Rust:","rust"],search_case(query, contents));
}
}