From be6a0b8b78f636baaa47489bb502904672fa8329 Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Sun, 17 Jan 2016 20:08:27 +0100
Subject: [PATCH] util: Add variant-generator utility

---
 libimagutil/src/lib.rs      |  4 +---
 libimagutil/src/variants.rs | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+), 3 deletions(-)
 create mode 100644 libimagutil/src/variants.rs

diff --git a/libimagutil/src/lib.rs b/libimagutil/src/lib.rs
index a93251b6..0797cbab 100644
--- a/libimagutil/src/lib.rs
+++ b/libimagutil/src/lib.rs
@@ -1,3 +1 @@
-#[test]
-fn it_works() {
-}
+pub mod variants;
diff --git a/libimagutil/src/variants.rs b/libimagutil/src/variants.rs
new file mode 100644
index 00000000..0ec53830
--- /dev/null
+++ b/libimagutil/src/variants.rs
@@ -0,0 +1,23 @@
+/**
+ * Generate variants of a base value by applying parts
+ *
+ * Example:
+ *
+ * ```ignore
+ * generate_variants(path, vec!["foo", "bar", "baz"], |b, v| {
+ *    let b = b.clone();
+ *    b.push(v);
+ *    b
+ * })
+ *
+ * ```
+ *
+ */
+pub fn generate_variants<A, B, C, F>(base: A, modders: Vec<B>, f: &F)
+    -> Vec<C>
+    where
+        F: Fn(&A, B) -> C
+{
+    modders.into_iter().map(|m| f(&base, m)).collect()
+}
+