use std LazyLock and simplify a .replace

Cargo.lock

@@ -1092,7 +1092,6 @@ dependencies = [
  "futures",
  "maud",
  "numbat",
- "once_cell",
  "rand",
  "regex",
  "reqwest",

Cargo.toml

@@ -25,10 +25,14 @@ fend-core = "1.4.5"
 futures = "0.3.30"
 maud = "0.26.0"
 numbat = "1.11.0"
-once_cell = "1.19.0"
 rand = "0.8.5"
 regex = "1.10.3"
-reqwest = { version = "0.11.26", default-features = false, features = ["rustls-tls", "gzip", "deflate", "brotli"] }
+reqwest = { version = "0.11.26", default-features = false, features = [
+    "rustls-tls",
+    "gzip",
+    "deflate",
+    "brotli",
+] }
 scraper = "0.19.0"
 serde = { version = "1.0.197", features = ["derive"] }
 # preserve_order is needed for google images. yippee!

src/config.rs

@@ -1,6 +1,5 @@
-use std::{collections::HashMap, fs, net::SocketAddr, path::Path};
+use std::{collections::HashMap, fs, net::SocketAddr, path::Path, sync::LazyLock};
 
-use once_cell::sync::Lazy;
 use serde::Deserialize;
 use tracing::info;
 
@@ -221,7 +220,7 @@ impl Default for EngineConfig {
         }
     }
 }
-static DEFAULT_ENGINE_CONFIG_REF: Lazy<EngineConfig> = Lazy::new(EngineConfig::default);
+static DEFAULT_ENGINE_CONFIG_REF: LazyLock<EngineConfig> = LazyLock::new(EngineConfig::default);
 impl EngineConfig {
     pub fn new() -> Self {
         Self::default()

src/engines/answer/fend.rs

@@ -1,8 +1,7 @@
-use std::cell::Cell;
+use std::{cell::Cell, sync::LazyLock};
 
 use fend_core::SpanKind;
 use maud::{html, PreEscaped};
-use once_cell::sync::Lazy;
 
 use crate::engines::EngineResponse;
 
@@ -106,7 +105,7 @@ fn evaluate_to_html(query: &str, html: bool) -> Option<PreEscaped<String>> {
     Some(PreEscaped(result_html))
 }
 
-pub static FEND_CONTEXT: Lazy<fend_core::Context> = Lazy::new(|| {
+pub static FEND_CTX: LazyLock<fend_core::Context> = LazyLock::new(|| {
     let mut context = fend_core::Context::new();
 
     // make lowercase f and c work
@@ -185,7 +184,7 @@ fn evaluate_into_spans(query: &str, multiline: bool) -> Vec<Span> {
         }
     }
 
-    let mut context = FEND_CONTEXT.clone();
+    let mut context = FEND_CTX.clone();
     if multiline {
         // this makes it generate slightly nicer outputs for some queries like 2d6
         context.set_output_mode_terminal();

src/engines/answer/numbat.rs

@@ -1,4 +1,4 @@
-use std::collections::HashSet;
+use std::{collections::HashSet, sync::LazyLock};
 
 use fend_core::SpanKind;
 use maud::{html, PreEscaped};
@@ -8,7 +8,6 @@ use numbat::{
     resolver::CodeSource,
     InterpreterResult, InterpreterSettings, Statement,
 };
-use once_cell::sync::Lazy;
 use tracing::debug;
 
 use crate::engines::EngineResponse;
@@ -179,7 +178,7 @@ fn markup_to_html(markup: Markup) -> PreEscaped<String> {
     PreEscaped(html)
 }
 
-pub static NUMBAT_CTX: Lazy<numbat::Context> = Lazy::new(|| {
+pub static NUMBAT_CTX: LazyLock<numbat::Context> = LazyLock::new(|| {
     let mut ctx = numbat::Context::new(numbat::module_importer::BuiltinModuleImporter {});
     let _ = ctx.interpret("use prelude", CodeSource::Internal);
     let _ = ctx.interpret("use units::currencies", CodeSource::Internal);

src/engines/mod.rs

@@ -4,14 +4,13 @@ use std::{
     net::IpAddr,
     ops::Deref,
     str::FromStr,
-    sync::Arc,
+    sync::{Arc, LazyLock},
     time::{Duration, Instant},
 };
 
 use eyre::bail;
 use futures::future::join_all;
 use maud::PreEscaped;
-use once_cell::sync::Lazy;
 use reqwest::{header::HeaderMap, RequestBuilder};
 use serde::{Deserialize, Deserializer};
 use tokio::sync::mpsc;
@@ -587,7 +586,7 @@ pub async fn autocomplete(config: &Config, query: &str) -> eyre::Result<Vec<Stri
     ))
 }
 
-pub static CLIENT: Lazy<reqwest::Client> = Lazy::new(|| {
+pub static CLIENT: LazyLock<reqwest::Client> = LazyLock::new(|| {
     reqwest::ClientBuilder::new()
         .local_address(IpAddr::from_str("0.0.0.0").unwrap())
         // we pretend to be a normal browser so websites don't block us

src/engines/search/bing.rs

@@ -115,8 +115,7 @@ pub fn parse_images_response(body: &str) -> eyre::Result<EngineImagesResponse> {
             .and_then(|v| v.as_str())
             .unwrap_or_default()
             // bing adds these unicode characters around matches
-            .replace('', "")
+            .replace(['', ''], "");
-            .replace('', "");
 
         // the text looks like "1200 x 1600 · jpegWikipedia"
         // (the last part is incorrectly parsed since the actual text is inside another