Move stdext to ext::try_err

src/ext/mod.rs

@@ -4,4 +4,5 @@ pub mod flagset;
 pub mod json;
 #[cfg(any(feature = "exif", feature = "avdict", feature = "ugoira"))]
 pub mod rawhandle;
+pub mod try_err;
 pub mod use_or_not;

src/ext/try_err.rs

@@ -0,0 +1,14 @@
+/// Try with custom error message
+pub trait TryErr<T, E> {
+    /// try with custom error message
+    fn try_err(&self, err: E) -> Result<T, E>;
+}
+
+impl<T: ToOwned + ToOwned<Owned = T>, E> TryErr<T, E> for Option<T> {
+    fn try_err(&self, v: E) -> Result<T, E> {
+        match self {
+            Some(r) => { Ok(r.to_owned()) }
+            None => { Err(v) }
+        }
+    }
+}

src/ext/use_or_not.rs

@@ -1,7 +1,7 @@
 use crate::ext::json::FromJson;
 use crate::ext::json::ToJson;
 use crate::gettext;
-use crate::stdext::TryErr;
+use crate::ext::try_err::TryErr;
 use std::str::FromStr;
 
 #[derive(Clone, Copy, Debug, PartialEq, PartialOrd)]