Replace std HashMap with ahash one, which is faster

Cargo.toml

@@ -29,9 +29,12 @@ aho-corasick = "1.0"
 regex = "1.9"
 
 # logging
-env_logger = "0.10"
+env_logger = "0.11"
 log = "0.4"
 
+# faster hashmap
+ahash = "0.8"
+
 # parallel
 rayon = "1.5"
 

src/defaults.rs

@@ -1,6 +1,6 @@
+use ahash::AHashMap as HashMap;
 use once_cell::sync::Lazy;
 use regex::Regex;
-use std::collections::HashMap;
 
 pub static RE: Lazy<Regex> = Lazy::new(|| {
     Regex::new(r#"\b(?:class(?:Name)*\s*=\s*["'])([_a-zA-Z0-9\.\s\-:\[\]/]+)["']"#).unwrap()

src/main.rs

@@ -6,13 +6,13 @@ pub mod parser;
 pub mod sorter;
 pub mod tls;
 
+use ahash::AHashSet as HashSet;
 use clap::Parser;
 use eyre::Result;
 use indoc::indoc;
 use once_cell::sync::Lazy;
 use options::{Options, WriteMode};
 use rayon::prelude::*;
-use std::collections::HashSet;
 use std::fs;
 use std::path::Path;
 use std::path::PathBuf;

src/options.rs

@@ -6,13 +6,14 @@ use ignore::WalkBuilder;
 use itertools::Itertools;
 use regex::Regex;
 use serde::Deserialize;
-use std::collections::HashMap;
-use std::collections::HashSet;
 use std::fs;
 use std::io::Read;
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
 
+use ahash::AHashMap as HashMap;
+use ahash::AHashSet as HashSet;
+
 use crate::parser;
 use crate::Cli;
 

src/parser.rs

@@ -1,5 +1,5 @@
 use std::{
-    collections::{hash_map::Entry, HashMap},
+    collections::hash_map::Entry,
     fs::File,
     io::{BufRead, BufReader, Read},
 };
@@ -8,6 +8,8 @@ use eyre::Result;
 use once_cell::sync::Lazy;
 use regex::Regex;
 
+use ahash::AHashMap as HashMap;
+
 static PARSER_RE: Lazy<Regex> = Lazy::new(|| Regex::new(r"^(\.[^\s]+)[ ]").unwrap());
 
 pub fn parse_classes_from_file(css_file: File) -> Result<HashMap<String, usize>> {

src/sorter.rs

@@ -1,4 +1,6 @@
-use std::{borrow::Cow, collections::HashMap};
+use std::borrow::Cow;
+
+use ahash::AHashMap as HashMap;
 
 use aho_corasick::{Anchored, Input};
 use itertools::Itertools;