refactor: do not format each ImageError

this makes the code much nicer,
but also it reduces the amount of extra fluff in the error messages.

src/utils.rs

@@ -1,48 +1,20 @@
 use std::path::{Path, PathBuf};
 
 use iced::widget;
-use image::{DynamicImage, ImageDecoder, ImageReader, RgbaImage};
+use image::{DynamicImage, ImageDecoder, ImageReader, ImageResult, RgbaImage};
 use rfd::FileDialog;
 
 pub fn load_image(path: impl AsRef<Path>) -> Result<RgbaImage, String> {
-    let path = path.as_ref();
-
-    let image_reader = match ImageReader::open(path).and_then(|r| r.with_guessed_format()) {
-        Ok(r) => r,
-        Err(e) => {
-            return Err(format!(
-                "failed to create image reader for '{}': {e}",
-                path.display()
-            ));
+    _load_image(path).map_err(|e| e.to_string())
 }
-    };
+fn _load_image(path: impl AsRef<Path>) -> ImageResult<RgbaImage> {
+    let mut decoder = ImageReader::open(path)?
+        .with_guessed_format()?
+        .into_decoder()?;
 
-    let mut decoder = match image_reader.into_decoder() {
-        Ok(d) => d,
-        Err(e) => {
-            return Err(format!(
-                "failed to create decoder for '{}': {e}",
-                path.display()
-            ));
-        }
-    };
+    let oreintation = decoder.orientation()?;
 
-    let oreintation = match decoder.orientation() {
-        Ok(o) => o,
-        Err(e) => {
-            return Err(format!(
-                "failed to get oreintation of '{}': {e}",
-                path.display()
-            ));
-        }
-    };
-
-    let mut decoded_image = match DynamicImage::from_decoder(decoder) {
-        Ok(i) => i,
-        Err(e) => {
-            return Err(format!("failed to decode image '{}': {e}", path.display()));
-        }
-    };
+    let mut decoded_image = DynamicImage::from_decoder(decoder)?;
 
     decoded_image.apply_orientation(oreintation);
 
@@ -75,7 +47,7 @@ pub fn save_image(image: Option<&RgbaImage>) -> Result<(), String> {
     };
 
     if let Err(e) = image.save(&path) {
-        return Err(format!("failed to save '{}': {e}", path.display()));
+        return Err(e.to_string());
     };
 
     Ok(())