diff rust/hg-core/src/config/config.rs @ 46797:bcdcb4423ae3

rhg: Add more conversions between error types

This allows using the `?` operator in more places, as the next commit does.

Differential Revision: https://phab.mercurial-scm.org/D10238

--- a/rust/hg-core/src/config/config.rs	Fri Mar 19 23:51:46 2021 +0100
+++ b/rust/hg-core/src/config/config.rs	Fri Mar 19 13:18:53 2021 +0100
@@ -17,6 +17,7 @@
 use format_bytes::{write_bytes, DisplayBytes};
 use std::collections::HashSet;
 use std::env;
+use std::fmt;
 use std::path::{Path, PathBuf};
 use std::str;
 
@@ -68,6 +69,21 @@
     pub expected_type: &'static str,
 }
 
+impl fmt::Display for ConfigValueParseError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        // TODO: add origin and line number information, here and in
+        // corresponding python code
+        write!(
+            f,
+            "config error: {}.{} is not a {} ('{}')",
+            String::from_utf8_lossy(&self.section),
+            String::from_utf8_lossy(&self.item),
+            self.expected_type,
+            String::from_utf8_lossy(&self.value)
+        )
+    }
+}
+
 impl Config {
     /// Load system and user configuration from various files.
     ///