Add exists method on Dir

embedded-fatfs/src/dir.rs

@@ -194,6 +194,25 @@ impl<'a, IO: ReadWriteSeek, TP: TimeProvider, OCC: OemCpConverter> Dir<'a, IO, T
         }
     }
 
+    /// Check to see if a file or directory with the given name exists
+    pub async fn exists(&self, mut path: &str, is_dir: Option<bool>) -> Result<bool, Error<IO::Error>> {
+        let mut dir = self.clone();
+        // traverse path
+        while let (name, Some(rest)) = split_path(path) {
+            dir = dir.find_entry(name, Some(true), None).await?.to_dir();
+            path = rest;
+        }
+        let (name, _rest) = split_path(path);
+
+        match self.find_entry(name, is_dir, None).await {
+            Ok(_) => Ok(true),
+            Err(e) => match e {
+                Error::NotFound => Ok(false),
+                _ => Err(e),
+            },
+        }
+    }
+
     /// Opens existing subdirectory.
     ///
     /// `path` is a '/' separated directory path relative to self directory.