Impl Display for downloader error

src/downloader/error.rs

@@ -1,19 +1,61 @@
 use crate::downloader::pd_file::PdFileError;
+use crate::gettext;
 use http::status::StatusCode;
 use tokio::time::error::Elapsed;
 use tokio::task::JoinError;
+use std::fmt::Display;
 
+/// File downloader's error
 #[derive(Debug, derive_more::From)]
 pub enum DownloaderError {
+    /// Request error
     ReqwestError(reqwest::Error),
+    /// [PdFileError]
     PdFileError(PdFileError),
+    /// Io Error
     IoError(std::io::Error),
+    /// String type message
     String(String),
+    /// HTTP Error
     ErrorStatusCode(StatusCode),
+    /// Timed out
     Timeout(Elapsed),
+    /// Failed to join
     JoinError(JoinError),
 }
 
+impl Display for DownloaderError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::ReqwestError(e) => {
+                f.write_str(gettext("Errors occured when requesting: "))?;
+                e.fmt(f)
+            }
+            Self::PdFileError(e) => {
+                f.write_str(gettext("Errors occured when operating pd file: "))?;
+                e.fmt(f)
+            }
+            Self::IoError(e) => {
+                f.write_str(gettext("Errors occured when operating files: "))?;
+                e.fmt(f)
+            }
+            Self::String(e) => {
+                f.write_str(e)
+            }
+            Self::ErrorStatusCode(e) => {
+                f.write_str("HTTP ERROR ")?;
+                e.fmt(f)
+            }
+            Self::Timeout(e) => {
+                e.fmt(f)
+            }
+            Self::JoinError(e) => {
+                e.fmt(f)
+            }
+        }
+    }
+}
+
 impl From<&str> for DownloaderError {
     fn from(v: &str) -> Self {
         Self::String(String::from(v))

src/downloader/tasks.rs

@@ -131,6 +131,7 @@ pub async fn handle_download<T: Seek + Write + Send + Sync + ClearFile + GetTarg
                                     d.pd.clear()?;
                                     if d.enabled_progress_bar() {
                                         d.set_progress_bar_position(0);
+                                        d.set_progress_bar_message(format!("{} {}", gettext("Error when downloading file:"), e));
                                     }
                                 }
                                 return Err(DownloaderError::from(e));
@@ -153,6 +154,7 @@ pub async fn handle_download<T: Seek + Write + Send + Sync + ClearFile + GetTarg
                     d.pd.clear()?;
                     if d.enabled_progress_bar() {
                         d.set_progress_bar_position(0);
+                        d.set_progress_bar_message(format!("{} {}", gettext("Error when downloading file:"), e));
                     }
                 }
                 return Err(DownloaderError::from(e));