feat: reduce the amount of `heck`-related allocations (#4634)

Co-authored-by: Lucas Nogueira <lucas@tauri.studio>

.changes/heck-allocations.md

@@ -0,0 +1,9 @@
+---
+"tauri-build": patch
+"tauri": patch
+"tauri-bundler": patch
+"cli.rs": patch
+"cli.js": patch
+---
+
+Reduce the amount of allocations when converting cases.

core/tauri-build/src/lib.rs

@@ -5,7 +5,8 @@
 #![cfg_attr(doc_cfg, feature(doc_cfg))]
 
 pub use anyhow::Result;
-use heck::ToSnakeCase;
+use heck::AsShoutySnakeCase;
+
 use tauri_utils::resources::{external_binaries, resource_relpath, ResourcePaths};
 
 use std::path::{Path, PathBuf};
@@ -68,12 +69,9 @@ fn copy_resources(resources: ResourcePaths<'_>, path: &Path) -> Result<()> {
 fn has_feature(feature: &str) -> bool {
   // when a feature is enabled, Cargo sets the `CARGO_FEATURE_<name` env var to 1
   // https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts
-  std::env::var(format!(
-    "CARGO_FEATURE_{}",
-    feature.to_snake_case().to_uppercase()
-  ))
-  .map(|x| x == "1")
-  .unwrap_or(false)
+  std::env::var(format!("CARGO_FEATURE_{}", AsShoutySnakeCase(feature)))
+    .map(|x| x == "1")
+    .unwrap_or(false)
 }
 
 // creates a cfg alias if `has_feature` is true.

core/tauri/build.rs

@@ -2,7 +2,10 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-License-Identifier: MIT
 
+use heck::AsShoutySnakeCase;
+use heck::AsSnakeCase;
 use heck::ToSnakeCase;
+
 use once_cell::sync::OnceCell;
 
 use std::{path::Path, sync::Mutex};
@@ -19,12 +22,9 @@ fn has_feature(feature: &str) -> bool {
 
   // when a feature is enabled, Cargo sets the `CARGO_FEATURE_<name` env var to 1
   // https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts
-  std::env::var(format!(
-    "CARGO_FEATURE_{}",
-    feature.to_snake_case().to_uppercase()
-  ))
-  .map(|x| x == "1")
-  .unwrap_or(false)
+  std::env::var(format!("CARGO_FEATURE_{}", AsShoutySnakeCase(feature)))
+    .map(|x| x == "1")
+    .unwrap_or(false)
 }
 
 // creates a cfg alias if `has_feature` is true.
@@ -148,11 +148,11 @@ fn alias_module(module: &str, apis: &[&str], api_all: bool) {
   for api in apis {
     let has = has_feature(&format!("{}-{}", module, api)) || all;
     alias(
-      &format!("{}_{}", module.to_snake_case(), api.to_snake_case()),
+      &format!("{}_{}", AsSnakeCase(module), AsSnakeCase(api)),
       has,
     );
     any = any || has;
   }
 
-  alias(&format!("{}_any", module.to_snake_case()), any);
+  alias(&format!("{}_any", AsSnakeCase(module)), any);
 }

tooling/bundler/src/bundle/linux/debian.rs

@@ -25,7 +25,7 @@
 use super::super::common;
 use crate::Settings;
 use anyhow::Context;
-use heck::ToKebabCase;
+use heck::AsKebabCase;
 use image::{self, codecs::png::PngDecoder, ImageDecoder};
 use libflate::gzip;
 use log::info;
@@ -170,11 +170,7 @@ fn generate_control_file(
   // https://www.debian.org/doc/debian-policy/ch-controlfields.html
   let dest_path = control_dir.join("control");
   let mut file = common::create_file(&dest_path)?;
-  writeln!(
-    file,
-    "Package: {}",
-    settings.product_name().to_kebab_case().to_ascii_lowercase()
-  )?;
+  writeln!(file, "Package: {}", AsKebabCase(settings.product_name()))?;
   writeln!(file, "Version: {}", settings.version_string())?;
   writeln!(file, "Architecture: {}", arch)?;
   // Installed-Size must be divided by 1024, see https://www.debian.org/doc/debian-policy/ch-controlfields.html#installed-size

tooling/cli/src/plugin/init.rs

@@ -10,7 +10,7 @@ use crate::{
 use anyhow::Context;
 use clap::Parser;
 use handlebars::{to_json, Handlebars};
-use heck::{ToKebabCase, ToSnakeCase};
+use heck::{AsKebabCase, ToKebabCase, ToSnakeCase};
 use include_dir::{include_dir, Dir};
 use log::warn;
 use std::{collections::BTreeMap, env::current_dir, fs::remove_dir_all, path::PathBuf};
@@ -58,7 +58,7 @@ pub fn command(mut options: Options) -> Result<()> {
   options.load();
   let template_target_path = PathBuf::from(options.directory).join(&format!(
     "tauri-plugin-{}",
-    options.plugin_name.to_kebab_case()
+    AsKebabCase(&options.plugin_name)
   ));
   let metadata = serde_json::from_str::<VersionMetadata>(include_str!("../../metadata.json"))?;
   if template_target_path.exists() {