Rewrite err_println to eprintln introduced in Rust 1.19 (#799)

Cargo.toml

@@ -41,10 +41,9 @@ env_logger = "0.4"
 x11-dl = "2"
 
 [features]
-default = ["err-println"]
+default = []
 # Enabling this feature makes shaders automatically reload when changed
 live-shader-reload = []
-err-println = []
 nightly = []
 bench = []
 

src/config.rs

@@ -370,7 +370,7 @@ impl<'a> de::Deserialize<'a> for ModsWrapper {
                         "Shift" => res.shift = true,
                         "Alt" | "Option" => res.alt = true,
                         "Control" => res.ctrl = true,
-                        _ => err_println!("unknown modifier {:?}", modifier),
+                        _ => eprintln!("unknown modifier {:?}", modifier),
                     }
                 }
 
@@ -467,7 +467,7 @@ impl<'a> de::Deserialize<'a> for ModeWrapper {
                         "~AppCursor" => res.not_mode |= mode::APP_CURSOR,
                         "AppKeypad" => res.mode |= mode::APP_KEYPAD,
                         "~AppKeypad" => res.not_mode |= mode::APP_KEYPAD,
-                        _ => err_println!("unknown omde {:?}", modifier),
+                        _ => eprintln!("unknown omde {:?}", modifier),
                     }
                 }
 
@@ -1476,7 +1476,7 @@ impl Monitor {
                                         let _ = config_tx.send(config);
                                         handler.on_config_reload();
                                     },
-                                    Err(err) => err_println!("Ignoring invalid config: {}", err),
+                                    Err(err) => eprintln!("Ignoring invalid config: {}", err),
                                 }
                              }
                         }

src/input.rs

@@ -187,7 +187,7 @@ impl Action {
                     .and_then(|clipboard| clipboard.load_primary() )
                     .map(|contents| { self.paste(ctx, contents) })
                     .unwrap_or_else(|err| {
-                        err_println!("Error loading data from clipboard. {}", Red(err));
+                        eprintln!("Error loading data from clipboard. {}", Red(err));
                     });
             },
             Action::PasteSelection => {

src/macros.rs

@@ -15,31 +15,11 @@
 #[macro_export]
 macro_rules! die {
     ($($arg:tt)*) => {{
-        err_println!($($arg)*);
+        eprintln!($($arg)*);
         ::std::process::exit(1);
     }}
 }
 
-#[macro_export]
-macro_rules! err_println {
-    ($($arg:tt)*) => {{
-        if cfg!(feature = "err-println") {
-            use std::io::Write;
-            (writeln!(&mut ::std::io::stderr(), $($arg)*)).expect("stderr");
-        }
-    }}
-}
-
-#[macro_export]
-macro_rules! err_print {
-    ($($arg:tt)*) => {{
-        if cfg!(feature = "err-println") {
-            use std::io::Write;
-            (write!(&mut ::std::io::stderr(), $($arg)*)).expect("stderr");
-        }
-    }}
-}
-
 #[macro_export]
 macro_rules! maybe {
     ($option:expr) => {

src/main.rs

@@ -68,7 +68,7 @@ fn load_config(options: &cli::Options) -> Config {
                 die!("Config file not found at: {}", config_path.display());
             },
             config::Error::Empty => {
-                err_println!("Empty config; Loading defaults");
+                eprintln!("Empty config; Loading defaults");
                 Config::default()
             },
             _ => die!("{}", err),