102 lines
2.0 KiB
Rust
102 lines
2.0 KiB
Rust
use std::env;
|
|
use std::error::Error;
|
|
use std::fs;
|
|
|
|
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>> {
|
|
// The ? operator passes the error back to the caller.
|
|
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(())
|
|
}
|
|
|
|
fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
|
|
let mut results = Vec::new();
|
|
|
|
for line in contents.lines() {
|
|
if line.contains(query) {
|
|
results.push(line)
|
|
}
|
|
}
|
|
|
|
results
|
|
}
|
|
|
|
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 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)
|
|
);
|
|
}
|
|
}
|