Merge pull request #3 from lxl66566/master

cargo feature: red

Author: Xavientois

Cargo.lock

@@ -13,3 +13,4 @@ license = "MIT"
 
 [features]
 test = []
+red = []

Cargo.toml

@@ -13,16 +13,17 @@ exit behaviour with a call to `panic!` in order to facilitate testing.
 [die-exit]: https://github.com/Xavientois/die
 
 ## Cargo.toml
+
 ```toml
 [dependencies]
-die-exit = "0.3"
+die-exit = "0.4"
 
 [dev-dependencies.die-exit]
-version = "0.3"
-features = ["test"]
+version = "0.4"
+features = ["test", "red"]
 ```
 
-## Example usage:
+## Example usage
 
 ```rust
 use die_exit::*;
@@ -52,9 +53,10 @@ die!(2); // prints nothing, only exits with code 3
 die!(); // prints nothing, only exits with code 1
 ```
 
-## Example testing:
+## Example testing
 
 Ensure that the `test` feature is turned on.
+
 ```rust
 #[cfg(test)]
 mod tests {
@@ -70,11 +72,13 @@ mod tests {
 ```
 
 ## `cargo` Features
+
 - **test**: Turn this on if you want to run tests where `die` might be used.
   This will change the behaviour of `die` and its variants to call `panic!()`
   instead of `process::exit()`.
+- **red**: Red and bold output.
 
-# License
+## License
 
 This project is licensed under the MIT license ([LICENSE-MIT](LICENSE-MIT)
-   http://opensource.org/licenses/MIT)
+http://opensource.org/licenses/MIT)

README.md

@@ -10,6 +10,14 @@ use std::process;
 /// const of 1
 pub const DEFAULT_EXIT_CODE: i32 = 1;
 
+#[cfg(feature = "red")]
+macro_rules! eprintln {
+    ($($arg:tt)*) => {
+        use std::io::Write;
+        writeln!(&mut ::std::io::stderr(), "\u{001b}[91;49;1m{}\u{001b}[0m", format!($($arg)*)).expect("failed printing to stderr");
+    };
+}
+
 /// Prints a message to [`stderr`] and terminates the current process with the specified exit code
 /// or 1 if no exit code is specified, by calling [`eprintln`]!() on all arguments followed by
 /// [process::exit(exit_code)][exit]