Fix the base path in desktop builds (#3949)

* Fix the base path in desktop builds

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

packages/cli/src/build/builder.rs

@@ -448,8 +448,8 @@ impl AppBuilder {
             ("RUST_BACKTRACE", "1".to_string()),
         ];
 
-        if let Some(base_path) = &krate.config.web.app.base_path {
-            envs.push((dioxus_cli_config::ASSET_ROOT_ENV, base_path.clone()));
+        if let Some(base_path) = krate.base_path() {
+            envs.push((dioxus_cli_config::ASSET_ROOT_ENV, base_path.to_string()));
         }
 
         if let Some(env_filter) = env::var_os("RUST_LOG").and_then(|e| e.into_string().ok()) {

packages/cli/src/build/request.rs

@@ -2014,8 +2014,8 @@ session_cache_dir: {}"#,
         // If this is a release build, bake the base path and title into the binary with env vars.
         // todo: should we even be doing this? might be better being a build.rs or something else.
         if self.release {
-            if let Some(base_path) = &self.config.web.app.base_path {
-                env_vars.push((ASSET_ROOT_ENV, base_path.clone()));
+            if let Some(base_path) = self.base_path() {
+                env_vars.push((ASSET_ROOT_ENV, base_path.to_string()));
             }
             env_vars.push((APP_TITLE_ENV, self.config.web.app.title.clone()));
         }
@@ -3612,7 +3612,7 @@ session_cache_dir: {}"#,
 
         // Add the base path to the head if this is a debug build
         if self.is_dev_build() {
-            if let Some(base_path) = &self.config.web.app.base_path {
+            if let Some(base_path) = &self.base_path() {
                 head_resources.push_str(&format_base_path_meta_element(base_path));
             }
         }
@@ -3698,7 +3698,7 @@ r#" <script>
 
     /// Replace any special placeholders in the HTML with resolved values
     fn replace_template_placeholders(&self, html: &mut String, wasm_path: &str, js_path: &str) {
-        let base_path = self.config.web.app.base_path();
+        let base_path = self.base_path_or_default();
         *html = html.replace("{base_path}", base_path);
 
         let app_name = &self.executable_name();
@@ -3729,4 +3729,24 @@ r#" <script>
             content.insert_str(pos, with);
         }
     }
+
+    /// Get the base path from the config or None if this is not a web or server build
+    pub(crate) fn base_path(&self) -> Option<&str> {
+        self.config
+            .web
+            .app
+            .base_path
+            .as_deref()
+            .filter(|_| matches!(self.platform, Platform::Web | Platform::Server))
+    }
+
+    /// Get the normalized base path for the application with `/` trimmed from both ends. If the base path is not set, this will return `.`.
+    pub(crate) fn base_path_or_default(&self) -> &str {
+        let trimmed_path = self.base_path().unwrap_or_default().trim_matches('/');
+        if trimmed_path.is_empty() {
+            "."
+        } else {
+            trimmed_path
+        }
+    }
 }

packages/cli/src/config/web.rs

@@ -98,22 +98,6 @@ pub(crate) struct WebAppConfig {
     pub(crate) base_path: Option<String>,
 }
 
-impl WebAppConfig {
-    /// Get the normalized base path for the application with `/` trimmed from both ends. If the base path is not set, this will return `.`.
-    pub(crate) fn base_path(&self) -> &str {
-        let trimmed_path = self
-            .base_path
-            .as_deref()
-            .unwrap_or_default()
-            .trim_matches('/');
-        if trimmed_path.is_empty() {
-            "."
-        } else {
-            trimmed_path
-        }
-    }
-}
-
 impl Default for WebAppConfig {
     fn default() -> Self {
         Self {