feat(codegen): use TARGET environment variable if set (#4921)

.changes/codegen-check-target.md

@@ -0,0 +1,5 @@
+---
+"tauri-codegen": patch
+---
+
+Use `TARGET` environment variable for code generation inside build scripts.

core/tauri-codegen/src/context.rs

@@ -28,6 +28,7 @@ pub struct ContextData {
 
 fn map_core_assets(
   options: &AssetOptions,
+  target: Target,
 ) -> impl Fn(&AssetKey, &Path, &mut Vec<u8>, &mut CspHashes) -> Result<(), EmbeddedAssetsError> {
   #[cfg(feature = "isolation")]
   let pattern = tauri_utils::html::PatternObject::from(&options.pattern);
@@ -40,8 +41,9 @@ fn map_core_assets(
 
       #[allow(clippy::collapsible_if)]
       if csp {
-        #[cfg(target_os = "linux")]
-        ::tauri_utils::html::inject_csp_token(&mut document);
+        if target == Target::Linux {
+          ::tauri_utils::html::inject_csp_token(&mut document);
+        }
 
         inject_nonce_token(&mut document, &dangerous_disable_asset_csp_modification);
 
@@ -106,6 +108,16 @@ fn map_isolation(
   }
 }
 
+#[derive(PartialEq, Eq, Clone, Copy)]
+enum Target {
+  Linux,
+  Windows,
+  Darwin,
+  Android,
+  // iOS.
+  Ios,
+}
+
 /// Build a `tauri::Context` for including in application code.
 pub fn context_codegen(data: ContextData) -> Result<TokenStream, EmbeddedAssetsError> {
   let ContextData {
@@ -115,6 +127,34 @@ pub fn context_codegen(data: ContextData) -> Result<TokenStream, EmbeddedAssetsE
     root,
   } = data;
 
+  let target = if let Ok(target) = std::env::var("TARGET") {
+    if target.contains("unknown-linux") {
+      Target::Linux
+    } else if target.contains("pc-windows") {
+      Target::Windows
+    } else if target.contains("apple-darwin") {
+      Target::Darwin
+    } else if target.contains("android") {
+      Target::Android
+    } else if target.contains("apple-ios") {
+      Target::Ios
+    } else {
+      panic!("unknown codegen target {}", target);
+    }
+  } else if cfg!(target_os = "linux") {
+    Target::Linux
+  } else if cfg!(windows) {
+    Target::Windows
+  } else if cfg!(target_os = "macos") {
+    Target::Darwin
+  } else if cfg!(target_os = "android") {
+    Target::Android
+  } else if cfg!(target_os = "ios") {
+    Target::Ios
+  } else {
+    panic!("unknown codegen target");
+  };
+
   let mut options = AssetOptions::new(config.tauri.pattern.clone())
     .freeze_prototype(config.tauri.security.freeze_prototype)
     .dangerous_disable_asset_csp_modification(
@@ -162,7 +202,7 @@ pub fn context_codegen(data: ContextData) -> Result<TokenStream, EmbeddedAssetsE
             path
           )
         }
-        EmbeddedAssets::new(assets_path, &options, map_core_assets(&options))?
+        EmbeddedAssets::new(assets_path, &options, map_core_assets(&options, target))?
       }
       _ => unimplemented!(),
     },
@@ -172,7 +212,7 @@ pub fn context_codegen(data: ContextData) -> Result<TokenStream, EmbeddedAssetsE
         .map(|p| config_parent.join(p))
         .collect::<Vec<_>>(),
       &options,
-      map_core_assets(&options),
+      map_core_assets(&options, target),
     )?,
     _ => unimplemented!(),
   };
@@ -189,18 +229,28 @@ pub fn context_codegen(data: ContextData) -> Result<TokenStream, EmbeddedAssetsE
     out_dir
   };
 
-  // handle default window icons for Windows targets
-  #[cfg(windows)]
   let default_window_icon = {
-    let icon_path = find_icon(
-      &config,
-      &config_parent,
-      |i| i.ends_with(".ico"),
-      "icons/icon.ico",
-    );
-    if icon_path.exists() {
-      ico_icon(&root, &out_dir, icon_path)?
-    } else {
+    if target == Target::Windows {
+      // handle default window icons for Windows targets
+      let icon_path = find_icon(
+        &config,
+        &config_parent,
+        |i| i.ends_with(".ico"),
+        "icons/icon.ico",
+      );
+      if icon_path.exists() {
+        ico_icon(&root, &out_dir, icon_path)?
+      } else {
+        let icon_path = find_icon(
+          &config,
+          &config_parent,
+          |i| i.ends_with(".png"),
+          "icons/icon.png",
+        );
+        png_icon(&root, &out_dir, icon_path)?
+      }
+    } else if target == Target::Linux {
+      // handle default window icons for Linux targets
       let icon_path = find_icon(
         &config,
         &config_parent,
@@ -208,23 +258,12 @@ pub fn context_codegen(data: ContextData) -> Result<TokenStream, EmbeddedAssetsE
         "icons/icon.png",
       );
       png_icon(&root, &out_dir, icon_path)?
+    } else {
+      quote!(None)
     }
   };
-  #[cfg(target_os = "linux")]
-  let default_window_icon = {
-    let icon_path = find_icon(
-      &config,
-      &config_parent,
-      |i| i.ends_with(".png"),
-      "icons/icon.png",
-    );
-    png_icon(&root, &out_dir, icon_path)?
-  };
-  #[cfg(not(any(windows, target_os = "linux")))]
-  let default_window_icon = quote!(None);
 
-  #[cfg(target_os = "macos")]
-  let app_icon = if dev {
+  let app_icon = if target == Target::Darwin && dev {
     let mut icon_path = find_icon(
       &config,
       &config_parent,
@@ -243,8 +282,6 @@ pub fn context_codegen(data: ContextData) -> Result<TokenStream, EmbeddedAssetsE
   } else {
     quote!(None)
   };
-  #[cfg(not(target_os = "macos"))]
-  let app_icon = quote!(None);
 
   let package_name = if let Some(product_name) = &config.package.product_name {
     quote!(#product_name.to_string())
@@ -283,43 +320,40 @@ pub fn context_codegen(data: ContextData) -> Result<TokenStream, EmbeddedAssetsE
   };
 
   #[cfg(target_os = "macos")]
-  let info_plist = {
-    if dev {
-      let info_plist_path = config_parent.join("Info.plist");
-      let mut info_plist = if info_plist_path.exists() {
-        plist::Value::from_file(&info_plist_path)
-          .unwrap_or_else(|e| panic!("failed to read plist {}: {}", info_plist_path.display(), e))
-      } else {
-        plist::Value::Dictionary(Default::default())
-      };
+  let info_plist = if target == Target::Darwin && dev {
+    let info_plist_path = config_parent.join("Info.plist");
+    let mut info_plist = if info_plist_path.exists() {
+      plist::Value::from_file(&info_plist_path)
+        .unwrap_or_else(|e| panic!("failed to read plist {}: {}", info_plist_path.display(), e))
+    } else {
+      plist::Value::Dictionary(Default::default())
+    };
 
-      if let Some(plist) = info_plist.as_dictionary_mut() {
-        if let Some(product_name) = &config.package.product_name {
-          plist.insert("CFBundleName".into(), product_name.clone().into());
-        }
-        if let Some(version) = &config.package.version {
-          plist.insert("CFBundleShortVersionString".into(), version.clone().into());
-        }
-        let format =
-          time::format_description::parse("[year][month][day].[hour][minute][second]").unwrap();
-        if let Ok(build_number) = time::OffsetDateTime::now_utc().format(&format) {
-          plist.insert("CFBundleVersion".into(), build_number.into());
-        }
+    if let Some(plist) = info_plist.as_dictionary_mut() {
+      if let Some(product_name) = &config.package.product_name {
+        plist.insert("CFBundleName".into(), product_name.clone().into());
+      }
+      if let Some(version) = &config.package.version {
+        plist.insert("CFBundleShortVersionString".into(), version.clone().into());
+      }
+      let format =
+        time::format_description::parse("[year][month][day].[hour][minute][second]").unwrap();
+      if let Ok(build_number) = time::OffsetDateTime::now_utc().format(&format) {
+        plist.insert("CFBundleVersion".into(), build_number.into());
       }
+    }
 
-      let out_path = out_dir.join("Info.plist");
-      info_plist
-        .to_file_xml(&out_path)
-        .expect("failed to write Info.plist");
+    let out_path = out_dir.join("Info.plist");
+    info_plist
+      .to_file_xml(&out_path)
+      .expect("failed to write Info.plist");
 
-      let info_plist_path = out_path.display().to_string();
-      quote!({
-        #[cfg(desktop)]
-        tauri::embed_plist::embed_info_plist!(#info_plist_path);
-      })
-    } else {
-      quote!(())
-    }
+    let info_plist_path = out_path.display().to_string();
+    quote!({
+      tauri::embed_plist::embed_info_plist!(#info_plist_path);
+    })
+  } else {
+    quote!(())
   };
   #[cfg(not(target_os = "macos"))]
   let info_plist = quote!(());
@@ -443,7 +477,6 @@ fn ico_icon<P: AsRef<Path>>(
   Ok(icon)
 }
 
-#[cfg(target_os = "macos")]
 fn raw_icon<P: AsRef<Path>>(out_dir: &Path, path: P) -> Result<TokenStream, EmbeddedAssetsError> {
   let path = path.as_ref();
   let bytes = std::fs::read(&path)
@@ -508,7 +541,6 @@ fn write_if_changed(out_path: &Path, data: &[u8]) -> std::io::Result<()> {
   out_file.write_all(data)
 }
 
-#[cfg(any(windows, target_os = "macos", target_os = "linux"))]
 fn find_icon<F: Fn(&&String) -> bool>(
   config: &Config,
   config_parent: &Path,