remove quick_error

quick_error used the deprecated Error::cause interface, therefore we
want to use our own error enums with proper methods.

1 files changed, 30 insertions, 12 deletions

diff --git a/src/render.rs b/src/render.rs
index 90eff14..9b71e18 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -7,20 +7,38 @@ use image::{
 use imageproc::{drawing, rect::Rect};
 use num_traits::NumCast;
 use rusttype::{Font, Scale, SharedBytes};
+use std::{error::Error, fmt};
 
-quick_error! {
-    #[derive(Debug)]
-    pub enum RenderError {
-        ApiError(err: ApiError) {
-            cause(err)
-            from()
-        }
-        ImageError(err: image::ImageError) {
-            cause(err)
-            from()
+#[derive(Debug)]
+pub enum RenderError {
+    ApiError(ApiError),
+    ImageError(image::ImageError),
+    EmptyBuild,
+}
+
+error_froms! { RenderError,
+    err: ApiError => RenderError::ApiError(err),
+    err: image::ImageError => RenderError::ImageError(err),
+}
+
+impl fmt::Display for RenderError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            RenderError::ApiError(_) => write!(f, "error accessing the API"),
+            RenderError::ImageError(_) => write!(f, "image processing error"),
+            RenderError::EmptyBuild => {
+                write!(f, "the build template contains nothing worth rendering")
+            }
         }
-        EmptyBuild {
-            description("The build template contains nothing worth rendering")
+    }
+}
+
+impl Error for RenderError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        match *self {
+            RenderError::ApiError(ref err) => Some(err),
+            RenderError::ImageError(ref err) => Some(err),
+            _ => None,
         }
     }
 }