refactor(chatlist): rustify

src/error.rs

@@ -16,6 +16,8 @@ pub enum Error {
     SqlFailedToOpen,
     #[fail(display = "{:?}", _0)]
     Io(std::io::Error),
+    #[fail(display = "{:?}", _0)]
+    Message(String),
 }
 
 pub type Result<T> = std::result::Result<T, Error>;
@@ -43,3 +45,67 @@ impl From<std::io::Error> for Error {
         Error::Io(err)
     }
 }
+
+#[macro_export]
+macro_rules! bail {
+    ($e:expr) => {
+        return Err($crate::error::Error::Message($e.to_string()));
+    };
+    ($fmt:expr, $($arg:tt)+) => {
+        return Err($crate::error::Error::Message(format!($fmt, $($arg)+)));
+    };
+}
+
+#[macro_export]
+macro_rules! format_err {
+    ($e:expr) => {
+        $crate::error::Error::Message($e.to_string());
+    };
+    ($fmt:expr, $($arg:tt)+) => {
+        $crate::error::Error::Message(format!($fmt, $($arg)+));
+    };
+}
+
+#[macro_export(local_inner_macros)]
+macro_rules! ensure {
+    ($cond:expr, $e:expr) => {
+        if !($cond) {
+            bail!($e);
+        }
+    };
+    ($cond:expr, $fmt:expr, $($arg:tt)+) => {
+        if !($cond) {
+            bail!($fmt, $($arg)+);
+        }
+    };
+}
+
+#[macro_export]
+macro_rules! ensure_eq {
+    ($left:expr, $right:expr) => ({
+        match (&$left, &$right) {
+            (left_val, right_val) => {
+                if !(*left_val == *right_val) {
+                    bail!(r#"assertion failed: `(left == right)`
+  left: `{:?}`,
+ right: `{:?}`"#, left_val, right_val)
+                }
+            }
+        }
+    });
+    ($left:expr, $right:expr,) => ({
+        ensure_eq!($left, $right)
+    });
+    ($left:expr, $right:expr, $($arg:tt)+) => ({
+        match (&($left), &($right)) {
+            (left_val, right_val) => {
+                if !(*left_val == *right_val) {
+                    bail!(r#"assertion failed: `(left == right)`
+  left: `{:?}`,
+ right: `{:?}`: {}"#, left_val, right_val,
+                           format_args!($($arg)+))
+                }
+            }
+        }
+    });
+}