From e606bb626ec2a30e10015006ea36443f65b12dd9 Mon Sep 17 00:00:00 2001
From: George Bateman <george.bateman16@gmail.com>
Date: Sun, 28 Apr 2024 14:13:08 +0100
Subject: [PATCH] Remove direct dependencies on lazy_static, once_cell and
 byteorder

The functionality of all three crates is now available in the standard library.
---
 Cargo.toml                        |  1 -
 src/comment.rs                    | 20 ++++++--------------
 src/lib.rs                        | 10 +++++++---
 src/test/configuration_snippet.rs | 22 +++++++---------------
 4 files changed, 20 insertions(+), 33 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 032b9b54810..b18c80654a0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,7 +44,6 @@ dirs = "4.0"
 getopts = "0.2"
 ignore = "0.4"
 itertools = "0.11"
-lazy_static = "1.4"
 regex = "1.7"
 serde = { version = "1.0.160", features = ["derive"] }
 serde_json = "1.0"
diff --git a/src/comment.rs b/src/comment.rs
index 7d1b0384431..099e12f86dd 100644
--- a/src/comment.rs
+++ b/src/comment.rs
@@ -3,8 +3,6 @@
 use std::{borrow::Cow, iter};
 
 use itertools::{multipeek, MultiPeek};
-use lazy_static::lazy_static;
-use regex::Regex;
 use rustc_span::Span;
 
 use crate::config::Config;
@@ -17,17 +15,6 @@ use crate::utils::{
 };
 use crate::{ErrorKind, FormattingError};
 
-lazy_static! {
-    /// A regex matching reference doc links.
-    ///
-    /// ```markdown
-    /// /// An [example].
-    /// ///
-    /// /// [example]: this::is::a::link
-    /// ```
-    static ref REFERENCE_LINK_URL: Regex = Regex::new(r"^\[.+\]\s?:").unwrap();
-}
-
 fn is_custom_comment(comment: &str) -> bool {
     if !comment.starts_with("//") {
         false
@@ -980,11 +967,16 @@ fn trim_custom_comment_prefix(s: &str) -> String {
 /// Returns `true` if the given string MAY include URLs or alike.
 fn has_url(s: &str) -> bool {
     // This function may return false positive, but should get its job done in most cases.
+    // The regex is indended to capture text such as the below.
+    //
+    // /// An [example].
+    // ///
+    // /// [example]: this::is::a::link
     s.contains("https://")
         || s.contains("http://")
         || s.contains("ftp://")
         || s.contains("file://")
-        || REFERENCE_LINK_URL.is_match(s)
+        || static_regex!(r"^\[.+\]\s?:").is_match(s)
 }
 
 /// Returns true if the given string may be part of a Markdown table.
diff --git a/src/lib.rs b/src/lib.rs
index 877d057a34b..e07720f30ca 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,9 +5,6 @@
 #![allow(clippy::match_like_matches_macro)]
 #![allow(unreachable_pub)]
 
-#[cfg(test)]
-#[macro_use]
-extern crate lazy_static;
 #[macro_use]
 extern crate tracing;
 
@@ -62,6 +59,13 @@ pub use crate::rustfmt_diff::{ModifiedChunk, ModifiedLines};
 #[macro_use]
 mod utils;
 
+macro_rules! static_regex {
+    ($re:literal) => {{
+        static RE: ::std::sync::OnceLock<::regex::Regex> = ::std::sync::OnceLock::new();
+        RE.get_or_init(|| ::regex::Regex::new($re).unwrap())
+    }};
+}
+
 mod attr;
 mod chains;
 mod closures;
diff --git a/src/test/configuration_snippet.rs b/src/test/configuration_snippet.rs
index 80b61c88a00..a195b306da3 100644
--- a/src/test/configuration_snippet.rs
+++ b/src/test/configuration_snippet.rs
@@ -24,19 +24,6 @@ impl ConfigurationSection {
     fn get_section<I: Iterator<Item = String>>(
         file: &mut Enumerate<I>,
     ) -> Option<ConfigurationSection> {
-        lazy_static! {
-            static ref CONFIG_NAME_REGEX: regex::Regex =
-                regex::Regex::new(r"^## `([^`]+)`").expect("failed creating configuration pattern");
-            // Configuration values, which will be passed to `from_str`:
-            //
-            // - must be prefixed with `####`
-            // - must be wrapped in backticks
-            // - may by wrapped in double quotes (which will be stripped)
-            static ref CONFIG_VALUE_REGEX: regex::Regex =
-                regex::Regex::new(r#"^#### `"?([^`]+?)"?`"#)
-                    .expect("failed creating configuration value pattern");
-        }
-
         loop {
             match file.next() {
                 Some((i, line)) => {
@@ -53,9 +40,14 @@ impl ConfigurationSection {
                         let start_line = (i + 2) as u32;
 
                         return Some(ConfigurationSection::CodeBlock((block, start_line)));
-                    } else if let Some(c) = CONFIG_NAME_REGEX.captures(&line) {
+                    } else if let Some(c) = static_regex!(r"^## `([^`]+)`").captures(&line) {
                         return Some(ConfigurationSection::ConfigName(String::from(&c[1])));
-                    } else if let Some(c) = CONFIG_VALUE_REGEX.captures(&line) {
+                    } else if let Some(c) = static_regex!(r#"^#### `"?([^`]+?)"?`"#).captures(&line) {
+                        // Configuration values, which will be passed to `from_str`
+                        //
+                        // - must be prefixed with `####`
+                        // - must be wrapped in backticks
+                        // - may by wrapped in double quotes (which will be stripped)
                         return Some(ConfigurationSection::ConfigValue(String::from(&c[1])));
                     }
                 }