[librsvg/rustify-rsvg-convert] Export PathOrUrl for rsvg-convert and impl some common traits for it

[Federico Mena Quintero <federico src gnome org>]

commit 10a75a0d22d388d5a151b28de792ab8a9dd67432
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Jan 21 13:47:46 2021 -0600

    Export PathOrUrl for rsvg-convert and impl some common traits for it

 src/c_api/handle.rs | 12 +++++++++++-
 src/c_api/mod.rs    |  2 +-
 src/lib.rs          |  1 +
 3 files changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/src/c_api/handle.rs b/src/c_api/handle.rs
index 5e6208f5..01b2ebb6 100644
--- a/src/c_api/handle.rs
+++ b/src/c_api/handle.rs
@@ -2131,7 +2131,8 @@ pub unsafe extern "C" fn rsvg_cleanup() {}
 /// `gio::File::new_for_path()` or `gio::File::new_for_uri()` as appropriate.
 ///
 /// This enum does the magic heuristics to figure this out.
-enum PathOrUrl {
+#[derive(Clone, Debug)]
+pub enum PathOrUrl {
     Path(PathBuf),
     Url(Url),
 }
@@ -2173,6 +2174,15 @@ impl PathOrUrl {
     }
 }
 
+impl fmt::Display for PathOrUrl {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            PathOrUrl::Path(ref p) => p.display().fmt(f),
+            PathOrUrl::Url(ref u) => u.fmt(f),
+        }
+    }
+}
+
 fn check_cairo_context(cr: &cairo::Context) -> Result<(), RenderingError> {
     let status = cr.status();
     if status == cairo::Status::Success {
diff --git a/src/c_api/mod.rs b/src/c_api/mod.rs
index fc14ab0d..fae73f75 100644
--- a/src/c_api/mod.rs
+++ b/src/c_api/mod.rs
@@ -48,6 +48,6 @@ pub use pixbuf_utils::{
 mod messages;
 
 mod dpi;
-mod handle;
+pub mod handle;
 pub mod pixbuf_utils;
 pub mod sizing;
diff --git a/src/lib.rs b/src/lib.rs
index 0e2595b5..53dc5c63 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -158,5 +158,6 @@ pub mod doctest_only {
 
 #[doc(hidden)]
 pub mod rsvg_convert_only {
+    pub use crate::c_api::handle::PathOrUrl;
     pub use crate::c_api::sizing::LegacySize;
 }