Add config file

Configuration may now be specified in either `$HOME/.alacritty.yml` or
`$HOME/.config/alacritty.yml`. See `alacritty.yml` in the repository
root for an example.

When a configuration file cannot be located, a default configuration is
used.

1 files changed, 7 insertions, 8 deletions

diff --git a/src/macros.rs b/src/macros.rs
index e35eeb90..8abad78d 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -14,17 +14,16 @@
 
 #[macro_export]
 macro_rules! die {
-    ($($arg:tt)*) => {
-        println!($($arg)*);
+    ($($arg:tt)*) => {{
+        err_println!($($arg)*);
         ::std::process::exit(1);
-    }
+    }}
 }
 
 #[macro_export]
 macro_rules! err_println {
-    ($($arg:tt)*) => {
-        if let Err(_) = writeln!(&mut ::std::io::stderr(), $($arg)*) {
-            die!("Cannot reach stderr");
-        }
-    }
+    ($($arg:tt)*) => {{
+        use std::io::Write;
+        (writeln!(&mut ::std::io::stderr(), $($arg)*)).expect("stderr");
+    }}
 }