From b2f764d004cf4ea6972000142f846274dfd66c8b Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Sun, 4 Sep 2016 17:50:55 +0200
Subject: [PATCH] Add warn_exit() convenience helper

---
 libimagutil/src/lib.rs       |  1 +
 libimagutil/src/warn_exit.rs | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 libimagutil/src/warn_exit.rs

diff --git a/libimagutil/src/lib.rs b/libimagutil/src/lib.rs
index 4d561a4d..16183e7b 100644
--- a/libimagutil/src/lib.rs
+++ b/libimagutil/src/lib.rs
@@ -24,4 +24,5 @@ pub mod ismatch;
 pub mod iter;
 pub mod key_value_split;
 pub mod variants;
+pub mod warn_exit;
 pub mod warn_result;
diff --git a/libimagutil/src/warn_exit.rs b/libimagutil/src/warn_exit.rs
new file mode 100644
index 00000000..399ebcd8
--- /dev/null
+++ b/libimagutil/src/warn_exit.rs
@@ -0,0 +1,22 @@
+/// This function prints the string `s` via the `warn!()` macro and then exits with the code `code`
+/// as status.
+///
+/// Convenience function to be used in matches to remove one scope:
+///
+/// ```ignore
+/// use libimagutil::warn_exit::warn_exit;
+///
+/// let r: Result<i32, i32> = Err(1);
+/// match r {
+///     Err(e) => warn_exit("Warning!", 42),
+///     Ok(num) => { /* ... */ }
+/// }
+/// ```
+///
+pub fn warn_exit(s: &str, code: i32) -> ! {
+    use std::process::exit;
+
+    warn!("{}", s);
+    exit(code);
+}
+