#![allow(non_snake_case)]
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_name)?;
let result = if config.case_sensitive{
Search(&config.query, &contents)
}
else{
SearchCaseInsensitive(&config.query, &contents)
};
for line in Search(&config.query, &contents){
println!("{}", line)
}
Ok(())
}
pub struct Config {
pub query: String,
pub file_name: String,
pub case_sensitive: bool,
}
impl Config {
pub fn build(mut args: env::Args) -> Result<Config, &'static str> {
args.next();
let query = match args.next() {
Some(Arg) => Arg,
None => return Err("Invalid query string"),
};
let file_name = match args.next() {
Some(Arg) => Arg,
None => return Err("Invalid file string"),
};
let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
Ok(Config { query, file_name, case_sensitive })
}
}
pub fn Search<'a>(query: &str, contents : &'a str) -> Vec<&'a str> {
contents
.lines()
.filter(|line| line.contains(query))
.collect()
}
pub fn SearchCaseInsensitive<'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."],
SearchCaseInsensitive(query, contents)
);
}
}