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pub mod structs;
use std::error::Error;
use std::fs;
use structs::config::Config;
pub fn run(config: Config) -> Result<&'static str, Box<dyn Error>> {
let query = &config.query;
let filename = &config.filename;
let contents = fs::read_to_string(filename)?;
let results = if config.case_sensitive {
search(query, &contents)
} else {
search_case_insensitive(query, &contents)
};
for line in results {
println!("{}", line);
}
Ok("OK")
}
pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
contents.lines()
.filter(|line| line.contains(query)).collect()
}
pub fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
contents.lines()
.filter(|line| {
line.to_lowercase()
.contains(&query.to_lowercase())
}).collect()
}
#[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));
}
}