From 5c11aa72239ecbdd9577f027bdc7e9468d68414e Mon Sep 17 00:00:00 2001
From: Laurenz <laurmaedje@gmail.com>
Date: Tue, 4 Feb 2020 11:22:00 +0100
Subject: =?UTF-8?q?Adapt=20for=20tonty=20and=20fix=20a=20few=20bugs=20?=
 =?UTF-8?q?=F0=9F=9A=A7?=
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---
 src/error.rs | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

(limited to 'src/error.rs')

diff --git a/src/error.rs b/src/error.rs
index 1eb48deb..3a095eef 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -35,3 +35,38 @@ impl Error {
         Error { message: message.into(), severity }
     }
 }
+
+/// Construct an error with formatted message and optionally severity and / or
+/// span.
+///
+/// # Examples
+/// ```
+/// # use typstc::err;
+/// # use typstc::syntax::span::Span;
+/// # let span = Span::ZERO;
+/// # let value = 0;
+///
+/// // With span and default severity `Error`.
+/// err!(span; "the wrong {}", value);
+///
+/// // With no span and severity `Warning`.
+/// err!(@Warning: span; "non-fatal!");
+///
+/// // Without span and default severity.
+/// err!("no spans here ...");
+/// ```
+#[macro_export]
+macro_rules! err {
+    (@$severity:ident: $span:expr; $($args:tt)*) => {
+        $crate::syntax::span::Spanned { v: err!(@$severity: $($args)*), span: $span }
+    };
+
+    (@$severity:ident: $($args:tt)*) => {
+        $crate::error::Error {
+            message: format!($($args)*),
+            severity: $crate::error::Severity::$severity,
+        }
+    };
+
+    ($($tts:tt)*) => { err!(@Error: $($tts)*) };
+}
-- 
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