chore: add vendor directory

1 files changed, 32 insertions, 0 deletions

diff --git a/vendor/itertools/src/group_map.rs b/vendor/itertools/src/group_map.rs
new file mode 100644
index 00000000..3dcee83a
--- /dev/null
+++ b/vendor/itertools/src/group_map.rs
@@ -0,0 +1,32 @@
+#![cfg(feature = "use_std")]
+
+use std::collections::HashMap;
+use std::hash::Hash;
+use std::iter::Iterator;
+
+/// Return a `HashMap` of keys mapped to a list of their corresponding values.
+///
+/// See [`.into_group_map()`](crate::Itertools::into_group_map)
+/// for more information.
+pub fn into_group_map<I, K, V>(iter: I) -> HashMap<K, Vec<V>>
+where
+    I: Iterator<Item = (K, V)>,
+    K: Hash + Eq,
+{
+    let mut lookup = HashMap::new();
+
+    iter.for_each(|(key, val)| {
+        lookup.entry(key).or_insert_with(Vec::new).push(val);
+    });
+
+    lookup
+}
+
+pub fn into_group_map_by<I, K, V, F>(iter: I, mut f: F) -> HashMap<K, Vec<V>>
+where
+    I: Iterator<Item = V>,
+    K: Hash + Eq,
+    F: FnMut(&V) -> K,
+{
+    into_group_map(iter.map(|v| (f(&v), v)))
+}