Improved error handling

src/Tools/tool_helper/src/lib.rs

@@ -6,6 +6,10 @@ pub mod raw;
 pub type Output    = Box<dyn Write>;
 pub type Input     = Box<dyn Read>;
 
+pub trait ErrorString {
+    fn to_string(self) -> String;
+}
+
 pub struct Error {
     pub exit_code: i32,
     pub action:    String,
@@ -27,6 +31,10 @@ impl Error {
         Error::from_text(error.to_string())
     }
 
+    pub fn from_core_error<T>(error: T) -> Error where T: core::fmt::Display {
+        Error::from_text(error.to_string())
+    }
+
     pub fn from_callback<F>(callback: F) -> Error where F: Fn() -> String {
         Error::from_text(callback())
     }
@@ -86,6 +94,12 @@ impl std::convert::From<std::convert::Infallible> for Error {
     }
 }
 
+impl<T: ErrorString> std::convert::From<T> for Error {
+    fn from(error: T) -> Self {
+        Error::from_text(error.to_string())
+    }
+}
+
 pub fn open_output_file(output_path: PathBuf) -> Result<BufWriter<std::fs::File>, Error> {
     Ok(std::io::BufWriter::new(std::fs::File::create(output_path)?))
 }