Improve error handling for clipboard actions

Previously, these could have crashed alacritty. Now, they simply print
an error message in Red to stderr. The Red format wrapper was moved to a
central location where both main.rs and the alacritty lib can access it.

1 files changed, 20 insertions, 0 deletions

diff --git a/src/util.rs b/src/util.rs
index cd8bc9a1..44f7b3de 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -35,6 +35,26 @@ pub fn limit<T: Ord>(value: T, min: T, max: T) -> T {
     cmp::min(cmp::max(value, min), max)
 }
 
+/// Utilities for writing to the
+pub mod fmt {
+    use std::fmt;
+
+    /// Write a `Display` or `Debug` escaped with Red
+    pub struct Red<T>(pub T);
+
+    impl<T: fmt::Display> fmt::Display for Red<T> {
+        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+            write!(f, "\x1b[31m{}\x1b[0m", self.0)
+        }
+    }
+
+    impl<T: fmt::Debug> fmt::Debug for Red<T> {
+        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+            write!(f, "\x1b[31m{:?}\x1b[0m", self.0)
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::limit;