use std::fs;
use std::error::Error;
use std::env;
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 path"),
};
let ignore_case = env::var("IGNORE_CASE").is_ok();
Ok(Config { query, file_path, ignore_case, })
}
}
pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
let content = fs::read_to_string(config.file_path)?;
let results = if config.ignore_case {
search_case_insensitive(&config.query, &content)
} else {
search(&config.query, &content)
};
for line in results { {
println!("{line}");
}
}
Ok(())
}
pub fn search<'a>(query: &str, content: &'a str) -> Vec<&'a str> {
content
.lines()
.filter( |line| line.contains(query))
.collect()
}
pub fn search_case_insensitive<'a>(query: &str, content: &'a str) -> Vec<&'a str> {
let query = query.to_lowercase();
let mut result = Vec::new();
for line in content.lines() {
if line.to_lowercase().contains(&query) {
result.push(line);
}
}
result
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn one_result() {
let query = "duct";
let content = "\
Rust:
safe, fast, and productive.
Pick three.
Duct tape.";
assert_eq!(vec!["safe, fast, and productive."], search(query, content));
}
#[test]
fn case_insensitive() {
let query= "rUsT";
let content = "\
Rust:
safe, fast, and productive.
Pick three.
Trust me.";
assert_eq!(vec!["Rust:", "Trust me."], search_case_insensitive(query, content));
}
}