162 lines
3.7 KiB
Rust
162 lines
3.7 KiB
Rust
use std::error::Error;
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use std::{env, fs};
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pub struct Config {
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pub query: String,
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pub file_path: String,
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pub ignore_case: bool,
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}
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impl Config {
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fn new(args: &[String]) -> Config {
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if args.len() < 3 {
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panic!("not enough arguments");
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}
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// let query = &args[1];
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// let file_path = &args[2];
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// (query, file_path)
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// (&args[1], &args[2])
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// In this case while learning rust, it is okay
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// to use clone() here while not managing lifetimes
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// and such.
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//
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// For rush, I will absolutely want to mess with
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// lifetimes and references for speed.
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// Gonna make this fast af
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// https://www.youtube.com/watch?v=y-5JFBEoU9c
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Config {
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query: args[1].clone(),
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file_path: args[2].clone(),
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ignore_case: false,
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}
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}
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// pub fn build(args: &[String]) -> Result<Config, &'static str> {
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// if args.len() < 3 {
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// return Err("not enough arguments");
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// }
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// Ok(Config {
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// query: args[1].clone(),
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// file_path: args[2].clone(),
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// ignore_case: env::var("IGNORE_CASE").is_ok(),
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// })
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// }
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pub fn build(mut args: impl Iterator<Item = String>) -> Result<Config, &'static str> {
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args.next();
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let query = match args.next() {
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Some(arg) => arg,
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None => return Err("Didn't get a query string"),
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};
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let file_path = match args.next() {
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Some(arg) => arg,
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None => return Err("Didn't get a file path"),
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};
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let ignore_case = env::var("IGNORE_CASE").is_ok();
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Ok(Config {
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query,
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file_path,
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ignore_case,
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})
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}
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}
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pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
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// Best to group configuration variables such as query, file_path,
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// and contents into one structure.
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let contents = fs::read_to_string(config.file_path)?;
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let results = if config.ignore_case {
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search_case_insensitive(&config.query, &contents)
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} else {
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search(&config.query, &contents)
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};
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for line in search(&config.query, &contents) {
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println!("{line}");
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}
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// println!("With text:\n{contents}");
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Ok(())
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}
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pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
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contents
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.lines()
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.filter(|line| line.contains(query))
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.collect()
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// let mut results = Vec::new();
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// for line in contents.lines() {
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// if line.contains(query) {
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// results.push(line);
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// }
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// }
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// results
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}
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pub fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
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let query = query.to_lowercase();
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let mut results = Vec::new();
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for line in contents.lines() {
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if line.to_lowercase().contains(&query) {
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results.push(line);
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}
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}
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results
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn one_result() {
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let query = "duct";
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let contents = "\
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Rust
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safe, fast, productive.
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Pick three.";
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assert_eq!(vec!["safe, fast, productive."], search(query, contents));
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}
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#[test]
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fn case_sensitive() {
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let query = "duct";
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let contents = "\
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Rust:
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safe, fast, productive.
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Pick three.
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Duct tape.";
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assert_eq!(vec!["safe, fast, productive."], search(query, contents));
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}
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#[test]
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fn case_insensitive() {
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let query = "rUsT";
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let contents = "\
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Rust:
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safe, fast, productive.
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Pick three.
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Trust me.";
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assert_eq!(
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vec!["Rust:", "Trust me."],
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search_case_insensitive(query, contents)
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);
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}
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}
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