refactor(cli): use tauri/custom-protocol instead of relying on user having custom-protocol in their cargo features (#8937)

* refactor(cli): use `tauri/custom-protocol` instead of relying on user having `custom-protocol` in their cargo features

* tauri-build dev cfg

* pass build-feature when building apk

* run beforeBuildCommand before first build for plugins

* clippy

* fix

* mut

* enhance dev/prod checks

* lint [skip ci]

---------

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

Author: amrbashir

.changes/remove-app-custom-protocol-feature.md

@@ -0,0 +1,8 @@
+---
+"@tauri-apps/cli": patch:breaking
+"tauri-cli": patch:breaking
+"tauri": patch:breaking
+"tauri-build": patch:breaking
+---
+
+The `custom-protocol` Cargo feature is no longer required on your application and is now ignored. To check if running on production, use `#[cfg(not(dev))]` instead of `#[cfg(feature = "custom-protocol")]`.

.changes/tauri-build-dev-changes.md

@@ -0,0 +1,5 @@
+---
+"tauri-build": patch:breaking
+---
+
+Removed `tauri_build::CodegenContext::dev()` and added `tauri_build::dev()`.

core/tauri-build/src/codegen/context.rs

@@ -17,7 +17,6 @@ use tauri_utils::config::FrontendDist;
 #[cfg_attr(docsrs, doc(cfg(feature = "codegen")))]
 #[derive(Debug)]
 pub struct CodegenContext {
-  dev: bool,
   config_path: PathBuf,
   out_file: PathBuf,
   capabilities: Option<Vec<PathBuf>>,
@@ -26,7 +25,6 @@ pub struct CodegenContext {
 impl Default for CodegenContext {
   fn default() -> Self {
     Self {
-      dev: false,
       config_path: PathBuf::from("tauri.conf.json"),
       out_file: PathBuf::from("tauri-build-context.rs"),
       capabilities: None,
@@ -68,14 +66,6 @@ impl CodegenContext {
     self
   }
 
-  /// Run the codegen in a `dev` context, meaning that Tauri is using a dev server or local file for development purposes,
-  /// usually with the `tauri dev` CLI command.
-  #[must_use]
-  pub fn dev(mut self) -> Self {
-    self.dev = true;
-    self
-  }
-
   /// Adds a capability file to the generated context.
   #[must_use]
   pub fn capability<P: AsRef<Path>>(mut self, path: P) -> Self {
@@ -131,7 +121,7 @@ impl CodegenContext {
     );
 
     let code = context_codegen(ContextData {
-      dev: self.dev,
+      dev: crate::dev(),
       config,
       config_parent,
       // it's very hard to have a build script for unit tests, so assume this is always called from

core/tauri-build/src/lib.rs

@@ -15,7 +15,6 @@
 use anyhow::Context;
 pub use anyhow::Result;
 use cargo_toml::Manifest;
-use heck::AsShoutySnakeCase;
 
 use tauri_utils::{
   acl::build::parse_capabilities,
@@ -207,15 +206,6 @@ fn copy_frameworks(dest_dir: &Path, frameworks: &[String]) -> Result<()> {
   Ok(())
 }
 
-// checks if the given Cargo feature is enabled.
-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_{}", AsShoutySnakeCase(feature)))
-    .map(|x| x == "1")
-    .unwrap_or(false)
-}
-
 // creates a cfg alias if `has_feature` is true.
 // `alias` must be a snake case string.
 fn cfg_alias(alias: &str, has_feature: bool) {
@@ -419,6 +409,12 @@ impl Attributes {
   }
 }
 
+pub fn dev() -> bool {
+  std::env::var("DEP_TAURI_DEV")
+    .expect("missing `cargo:dev` instruction, please update tauri to latest")
+    == "true"
+}
+
 /// Run all build time helpers for your Tauri Application.
 ///
 /// The current helpers include the following:
@@ -499,7 +495,7 @@ pub fn try_build(attributes: Attributes) -> Result<()> {
     mobile::generate_gradle_files(project_dir)?;
   }
 
-  cfg_alias("dev", !has_feature("custom-protocol"));
+  cfg_alias("dev", dev());
 
   let ws_path = get_workspace_dir()?;
   let mut manifest =

core/tauri/build.rs

@@ -205,8 +205,12 @@ fn alias(alias: &str, has_feature: bool) {
 }
 
 fn main() {
-  alias("custom_protocol", has_feature("custom-protocol"));
-  alias("dev", !has_feature("custom-protocol"));
+  let custom_protocol = has_feature("custom-protocol");
+  let dev = !custom_protocol;
+  alias("custom_protocol", custom_protocol);
+  alias("dev", dev);
+
+  println!("cargo:dev={}", dev);
 
   let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap();
   let mobile = target_os == "ios" || target_os == "android";