refactor(build): allow setting window icon path on `try_build` (#1686)

.changes/tauri-build-icon-path.md

@@ -0,0 +1,5 @@
+---
+"tauri-build": patch
+---
+
+The `try_build` method now has a `Attributes` argument to allow specifying the window icon path used on Windows.

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

@@ -11,6 +11,7 @@ use std::{
 };
 use tauri_codegen::{context_codegen, ContextData};
 
+// TODO docs
 /// A builder for generating a Tauri application context during compile time.
 ///
 /// Meant to be used with [`tauri::include_codegen_context!`] inside your application code.

core/tauri-build/src/lib.rs

@@ -6,12 +6,62 @@
 
 pub use anyhow::Result;
 
+use std::path::{Path, PathBuf};
+
 #[cfg(feature = "codegen")]
 mod codegen;
 
 #[cfg(feature = "codegen")]
 pub use codegen::context::CodegenContext;
 
+/// Attributes used on Windows.
+#[allow(dead_code)]
+pub struct WindowsAttributes {
+  window_icon_path: PathBuf,
+}
+
+impl Default for WindowsAttributes {
+  fn default() -> Self {
+    Self {
+      window_icon_path: PathBuf::from("icons/icon.ico"),
+    }
+  }
+}
+
+impl WindowsAttributes {
+  /// Creates the default attribute set.
+  pub fn new() -> Self {
+    Self::default()
+  }
+
+  /// Sets the icon to use on the window. Currently only used on Windows.
+  /// It must be in `ico` format. Defaults to `icons/icon.ico`.
+  pub fn window_icon_path<P: AsRef<Path>>(mut self, window_icon_path: P) -> Self {
+    self.window_icon_path = window_icon_path.as_ref().into();
+    self
+  }
+}
+
+/// The attributes used on the build.
+#[derive(Default)]
+pub struct Attributes {
+  #[allow(dead_code)]
+  windows_attributes: WindowsAttributes,
+}
+
+impl Attributes {
+  /// Creates the default attribute set.
+  pub fn new() -> Self {
+    Self::default()
+  }
+
+  /// Sets the icon to use on the window. Currently only used on Windows.
+  pub fn windows_attributes(mut self, windows_attributes: WindowsAttributes) -> Self {
+    self.windows_attributes = windows_attributes;
+    self
+  }
+}
+
 /// Run all build time helpers for your Tauri Application.
 ///
 /// The current helpers include the following:
@@ -32,27 +82,39 @@ pub use codegen::context::CodegenContext;
 /// If any of the build time helpers fail, they will [`std::panic!`] with the related error message.
 /// This is typically desirable when running inside a build script; see [`try_build`] for no panics.
 pub fn build() {
-  if let Err(error) = try_build() {
+  if let Err(error) = try_build(Attributes::default()) {
     panic!("error found during tauri-build: {}", error);
   }
 }
 
 /// Non-panicking [`build()`].
-pub fn try_build() -> Result<()> {
+#[allow(unused_variables)]
+pub fn try_build(attributes: Attributes) -> Result<()> {
   #[cfg(windows)]
   {
     use anyhow::{anyhow, Context};
-    use std::path::Path;
     use winres::WindowsResource;
 
-    if Path::new("icons/icon.ico").exists() {
+    let icon_path_string = attributes
+      .windows_attributes
+      .window_icon_path
+      .to_string_lossy()
+      .into_owned();
+
+    if attributes.windows_attributes.window_icon_path.exists() {
       let mut res = WindowsResource::new();
-      res.set_icon_with_id("icons/icon.ico", "32512");
+      res.set_icon_with_id(&icon_path_string, "32512");
       res.compile().with_context(|| {
-        "failed to compile icons/icon.ico into a Windows Resource file during tauri-build"
+        format!(
+          "failed to compile `{}` into a Windows Resource file during tauri-build",
+          icon_path_string
+        )
       })?;
     } else {
-      return Err(anyhow!("no icons/icon.ico file found; required for generating a Windows Resource file during tauri-build"));
+      return Err(anyhow!(format!(
+        "`{}` not found; required for generating a Windows Resource file during tauri-build",
+        icon_path_string
+      )));
     }
   }
 

core/tauri-codegen/src/context.rs

@@ -44,7 +44,15 @@ pub fn context_codegen(data: ContextData) -> Result<TokenStream, EmbeddedAssetsE
 
   // handle default window icons for Windows targets
   let default_window_icon = if cfg!(windows) {
-    let icon_path = config_parent.join("icons/icon.ico").display().to_string();
+    let icon_path = config
+      .tauri
+      .bundle
+      .icon
+      .iter()
+      .find(|i| i.ends_with(".ico"))
+      .cloned()
+      .unwrap_or_else(|| "icons/icon.ico".to_string());
+    let icon_path = config_parent.join(icon_path).display().to_string();
     quote!(Some(include_bytes!(#icon_path).to_vec()))
   } else {
     quote!(None)

core/tauri-utils/src/config.rs

@@ -306,12 +306,16 @@ impl CliConfig {
 pub struct BundleConfig {
   /// The bundle identifier.
   pub identifier: String,
+  /// The bundle icons.
+  #[serde(default)]
+  pub icon: Vec<String>,
 }
 
 impl Default for BundleConfig {
   fn default() -> Self {
     Self {
       identifier: String::from(""),
+      icon: Vec::default(),
     }
   }
 }
@@ -725,8 +729,9 @@ mod build {
   impl ToTokens for BundleConfig {
     fn to_tokens(&self, tokens: &mut TokenStream) {
       let identifier = str_lit(&self.identifier);
+      let icon = vec_lit(&self.icon, str_lit);
 
-      literal_struct!(tokens, BundleConfig, identifier);
+      literal_struct!(tokens, BundleConfig, identifier, icon);
     }
   }
 
@@ -843,6 +848,7 @@ mod test {
       }],
       bundle: BundleConfig {
         identifier: String::from(""),
+        icon: Vec::new(),
       },
       cli: None,
       updater: UpdaterConfig {