resource: Use a fallback path if needed

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/resource.rs b/src/resource.rs
index d8fab16..6f2b33b 100644
--- a/src/resource.rs
+++ b/src/resource.rs
@@ -88,12 +88,20 @@ pub fn open<P: AsRef<Path>>(subpath: P) -> io::Result<Box<dyn Read>> {
     }
 }
 
+fn internal_fallback_path() -> Option<&'static Path> {
+    match env!("FALLBACK_PATH") {
+        "" => None,
+        s => Some(Path::new(s)),
+    }
+}
+
 fn internal_open(subpath: &Path) -> io::Result<Box<dyn Read>> {
     let search_paths = SEARCH_PATHS.lock().expect("Unable to lock SEARCH_PATHS");
     let search_paths = search_paths.iter().map(|p| p.as_path());
     let search_paths = std::iter::empty()
         .chain(Some(Path::new(".")))
-        .chain(search_paths);
+        .chain(search_paths)
+        .chain(internal_fallback_path());
     let mut ret = Err(io::Error::new(
         io::ErrorKind::NotFound,
         format!("Unable to find {} in resource paths", subpath.display()),