From 14c9abbfeaf65db8f813f5b18fc3e0bd3e8feeff Mon Sep 17 00:00:00 2001
From: baoyachi <liaoymxsdl@gmail.com>
Date: Sat, 15 Oct 2022 21:36:03 +0800
Subject: [PATCH] fix #115

---
 Cargo.toml |  2 +-
 src/env.rs |  2 +-
 src/err.rs | 20 ++++++++++++--------
 src/git.rs |  2 +-
 4 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index efe7ef7..60db506 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "shadow-rs"
-version = "0.16.3"
+version = "0.17.0"
 authors = ["baoyachi <liaoymxsdl@gmail.com>"]
 edition = "2021"
 description = "A build-time information stored in your rust project"
diff --git a/src/env.rs b/src/env.rs
index f85b6d9..c4a5e4d 100644
--- a/src/env.rs
+++ b/src/env.rs
@@ -264,7 +264,7 @@ pub fn new_system_env(std_env: &BTreeMap<String, String>) -> BTreeMap<ShadowCons
     );
 
     if let Err(e) = env.init(std_env) {
-        println!("{}", e.to_string());
+        println!("{}", e);
     }
     env.map
 }
diff --git a/src/err.rs b/src/err.rs
index 1526bd6..4372c10 100644
--- a/src/err.rs
+++ b/src/err.rs
@@ -1,5 +1,7 @@
 use std::convert::From;
 use std::error::Error;
+use std::error::Error as StdError;
+use std::fmt::{Display, Formatter};
 use std::string::FromUtf8Error;
 
 pub type SdResult<T> = Result<T, ShadowError>;
@@ -15,14 +17,6 @@ impl ShadowError {
     }
 }
 
-impl ToString for ShadowError {
-    fn to_string(&self) -> String {
-        match self {
-            ShadowError::String(e) => e.to_string(),
-        }
-    }
-}
-
 impl From<std::string::FromUtf8Error> for ShadowError {
     fn from(e: FromUtf8Error) -> Self {
         ShadowError::String(e.to_string())
@@ -58,3 +52,13 @@ impl From<std::num::ParseIntError> for ShadowError {
         ShadowError::String(e.to_string())
     }
 }
+
+impl Display for ShadowError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            ShadowError::String(err) => f.write_str(err),
+        }
+    }
+}
+
+impl StdError for ShadowError {}
diff --git a/src/git.rs b/src/git.rs
index 6651f6c..bd9273c 100644
--- a/src/git.rs
+++ b/src/git.rs
@@ -256,7 +256,7 @@ pub fn new_git(
     );
 
     if let Err(e) = git.init(path, std_env) {
-        println!("{}", e.to_string());
+        println!("{}", e);
     }
 
     git.map