Finally fix the resize_png fn (Oh god thank you PJB3005)

src/dmi.rs

@@ -1,4 +1,5 @@
 use crate::error::{Error, Result};
+use image::error::ImageError;
 use png::{Decoder, Encoder, OutputInfo};
 use std::{
     fs::{create_dir_all, File},
@@ -14,7 +15,7 @@ byond_fn! { dmi_create_png(path, width, height, data) {
 } }
 
 byond_fn! { dmi_resize_png(path, width, height) {
-    resize_png(path, width, height).err()
+    resize_png(path, width, height).err().map(|e| format!("{:?}", e))
 } }
 
 fn strip_metadata(path: &str) -> Result<()> {
@@ -68,11 +69,30 @@ fn create_png(path: &str, width: &str, height: &str, data: &str) -> Result<()> {
     Ok(writer.write_image_data(&result)?)
 }
 
-fn resize_png(path: &str, width: &str, height: &str) -> Result<()> {
+#[derive(Debug)]
+enum ResizePngError {
+    StringParse(std::num::ParseIntError),
+    Image(ImageError),
+}
+
+impl From<std::num::ParseIntError> for ResizePngError {
+    fn from(error: std::num::ParseIntError) -> Self {
+        ResizePngError::StringParse(error)
+    }
+}
+
+impl From<ImageError> for ResizePngError {
+    fn from(error: ImageError) -> Self {
+        ResizePngError::Image(error)
+    }
+}
+
+fn resize_png(path: &str, width: &str, height: &str) -> std::result::Result<(), ResizePngError> {
     let width = u32::from_str_radix(width, 10)?;
     let height = u32::from_str_radix(height, 10)?;
 
     let img = image::open(path)?;
+
     let newimg = img.resize(width, height, image::imageops::Nearest);
 
     Ok(newimg.save_with_format(&path, image::ImageFormat::Png)?)