uidev: support external paths

uidev/src/testbed/testbed_any.rs

@@ -20,7 +20,11 @@ pub struct TestbedAny {
 
 impl TestbedAny {
 	pub fn new(name: &str) -> anyhow::Result<Self> {
-		let path = AssetPath::BuiltIn(&format!("gui/{name}.xml"));
+		let path = if name.ends_with(".xml") {
+			AssetPath::Filesystem(name)
+		} else {
+			AssetPath::BuiltIn(&format!("gui/{name}.xml"))
+		};
 
 		let globals = WguiGlobals::new(
 			Box::new(assets::Asset {}),

wgui/src/assets.rs

@@ -1,4 +1,5 @@
 use flate2::read::GzDecoder;
+use std::ffi::OsStr;
 use std::io::Read;
 use std::path::{Path, PathBuf};
 
@@ -96,6 +97,9 @@ pub fn normalize_path(path: &Path) -> PathBuf {
 			std::path::Component::Normal(name) => {
 				stack.push(name);
 			}
+			std::path::Component::RootDir => {
+				stack.push(OsStr::new(std::path::MAIN_SEPARATOR_STR));
+			}
 			_ => {}
 		}
 	}

wgui/src/globals.rs

@@ -66,13 +66,20 @@ impl WguiGlobals {
 			AssetPath::WguiInternal(path) => self.assets_internal().load_from_path(path),
 			AssetPath::BuiltIn(path) => self.assets_builtin().load_from_path(path),
 			AssetPath::Filesystem(path) => {
-				let mut file = std::fs::File::open(path)?;
+				let mut file = match std::fs::File::open(path) {
+					Ok(f) => f,
+					Err(e) => {
+						anyhow::bail!("Could not open asset from {path}: {e}");
+					}
+				};
 				/* 16 MiB safeguard */
 				if file.metadata()?.len() > 16 * 1024 * 1024 {
-					anyhow::bail!("Too large file size");
+					anyhow::bail!("Could not open asset from {path}: Over size limit (16MiB)");
 				}
 				let mut data = Vec::new();
-				file.read_to_end(&mut data)?;
+				if let Err(e) = file.read_to_end(&mut data) {
+					anyhow::bail!("Could not read asset from {path}: {e}");
+				}
 				Ok(data)
 			}
 		}