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use std::env;
use std::fs::File;
use std::io::Read;
use std::env::Args;
use std::error::Error;
pub struct Config {
query: String,
filename: String,
case_sensitive: bool,
}
impl Config {
pub fn new(mut args: Args) -> Result<Config, &'static str> {
args.next();
let _query = match args.next() {
Some(v) => v,
None => return Err("Didnt get query to search for")
};
let _filename = match args.next() {
Some(v) => v,
None => return Err("Didnt get filename for searching")
};
let _case_sensitive = env::var("CASE_INSENSITIVE").is_err();
return Result::Ok(
Config {
query: _query,
filename: _filename,
case_sensitive: _case_sensitive,
}
);
}
}
pub fn run(config: Config) -> Result<(), Box<Error>> {
let mut file = File::open(config.filename.clone())?;
let mut content = String::new();
file.read_to_string(&mut content)?;
let results = if config.case_sensitive {
search_sensitive(&config.query, &content)
} else {
search_insensitive(&config.query, &content)
};
for result in results {
println!("{}", result);
}
Ok(())
}
pub fn search_sensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
contents.lines().filter(|line| line.contains(query)).collect()
}
pub fn search_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
let query = query.to_lowercase();
contents.lines().filter(|line| line.contains(&query)).collect()
}
#[cfg(test)]
mod test {
use crate::*;
#[test]
fn case_sensitive() {
let query = "duct";
let contents = "Rust:\nsafe, fast, productive\nPick three\nDuct Tape";
assert_eq!(vec!["safe, fast, productive"], search_sensitive(query, contents));
}
#[test]
fn case_insensitive() {
let query = "rUsT";
let contents = "Rust:\nsafe, fast, productive\nPick three.\nTrust me";
assert_eq!(vec!["Rust:", "Trust me"], search_insensitive(query, contents));
}
}