Add ErrorWithExitCode struct

scarb/src/bin/scarb/errors.rs

@@ -0,0 +1,44 @@
+use anyhow::Result;
+use thiserror::Error;
+
+pub type ScarbResult<T> = Result<T, ErrorWithExitCode>;
+
+/// The ErrorWithExitCode is the error type used at Scarb's CLI-layer.
+#[derive(Error, Debug)]
+#[error("ErrorWithExitCode exit_code: {exit_code}")]
+pub struct ErrorWithExitCode {
+    /// The error to display. This can be `None` in rare cases to exit with a
+    /// code without displaying a message.
+    #[source]
+    pub source: Option<anyhow::Error>,
+    /// The process exit code.
+    pub exit_code: i32,
+}
+
+impl ErrorWithExitCode {
+    pub fn new(error: anyhow::Error, code: i32) -> Self {
+        Self {
+            source: Some(error),
+            exit_code: code,
+        }
+    }
+
+    pub fn code(code: i32) -> Self {
+        Self {
+            source: None,
+            exit_code: code,
+        }
+    }
+}
+
+impl From<anyhow::Error> for ErrorWithExitCode {
+    fn from(err: anyhow::Error) -> ErrorWithExitCode {
+        ErrorWithExitCode::new(err, 1)
+    }
+}
+
+impl From<std::io::Error> for ErrorWithExitCode {
+    fn from(err: std::io::Error) -> ErrorWithExitCode {
+        ErrorWithExitCode::new(err.into(), 1)
+    }
+}