Add i18n by using rust i18n (#807)

* feat: initial i18n setup

* style: fmt

* feat: i18n support for new steps

* fix: build on Linux

* fix: build on Linux

* refactor: rm unused translation keys

---------

Co-authored-by: Steve Lau <stevelauc@outlook.com>

src/error.rs

@@ -1,41 +1,98 @@
-use std::process::ExitStatus;
+use std::{fmt::Display, process::ExitStatus};
 
+use rust_i18n::t;
 use thiserror::Error;
 
 #[derive(Error, Debug, PartialEq, Eq)]
 pub enum TopgradeError {
-    #[error("`{0}` failed: {1}")]
     ProcessFailed(String, ExitStatus),
 
-    #[error("`{0}` failed: {1}")]
     ProcessFailedWithOutput(String, ExitStatus, String),
 
-    #[error("Unknown Linux Distribution")]
     #[cfg(target_os = "linux")]
     UnknownLinuxDistribution,
 
-    #[error("File \"/etc/os-release\" does not exist or is empty")]
     #[cfg(target_os = "linux")]
     EmptyOSReleaseFile,
 
-    #[error("Failed getting the system package manager")]
     #[cfg(target_os = "linux")]
     FailedGettingPackageManager,
 }
 
+impl Display for TopgradeError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            TopgradeError::ProcessFailed(process, exit_status) => {
+                write!(
+                    f,
+                    "{}",
+                    t!(
+                        "`{process}` failed: {exit_satus}",
+                        process = process,
+                        exit_status = exit_status
+                    )
+                )
+            }
+            TopgradeError::ProcessFailedWithOutput(process, exit_status, output) => {
+                write!(
+                    f,
+                    "{}",
+                    t!(
+                        "`{process}` failed: {exit_satus} with {output}",
+                        process = process,
+                        exit_status = exit_status,
+                        output = output
+                    )
+                )
+            }
+            #[cfg(target_os = "linux")]
+            TopgradeError::UnknownLinuxDistribution => write!(f, "{}", t!("Unknown Linux Distribution")),
+            #[cfg(target_os = "linux")]
+            TopgradeError::EmptyOSReleaseFile => {
+                write!(f, "{}", t!("File \"/etc/os-release\" does not exist or is empty"))
+            }
+            #[cfg(target_os = "linux")]
+            TopgradeError::FailedGettingPackageManager => {
+                write!(f, "{}", t!("Failed getting the system package manager"))
+            }
+        }
+    }
+}
+
 #[derive(Error, Debug)]
-#[error("A step failed")]
 pub struct StepFailed;
 
-#[derive(Error, Debug)]
-#[error("Dry running")]
-pub struct DryRun();
+impl Display for StepFailed {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", t!("A step failed"))
+    }
+}
+
+#[derive(Error, Debug)]
+pub struct DryRun();
+
+impl Display for DryRun {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", t!("Dry running"))
+    }
+}
 
 #[derive(Error, Debug)]
-#[error("{0}")]
 pub struct SkipStep(pub String);
 
+impl Display for SkipStep {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
 #[cfg(all(windows, feature = "self-update"))]
 #[derive(Error, Debug)]
-#[error("Topgrade Upgraded")]
 pub struct Upgraded(pub ExitStatus);
+
+#[cfg(all(windows, feature = "self-update"))]
+impl Display for Upgraded {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", t!("Topgrade Upgraded"))
+    }
+}