From a838a55561e226e8b477d22864b8c986c1ab55e5 Mon Sep 17 00:00:00 2001
From: Brendan Hansen <brendan.f.hansen@gmail.com>
Date: Thu, 19 Oct 2023 14:36:05 -0500
Subject: [PATCH] added: `slice.group_by`

---
 core/container/slice.onyx | 27 +++++++++++++++++++++++++++
 core/std.onyx             |  2 +-
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/core/container/slice.onyx b/core/container/slice.onyx
index 84947104..41d12081 100644
--- a/core/container/slice.onyx
+++ b/core/container/slice.onyx
@@ -620,6 +620,33 @@ chunks :: (arr: [] $T, width: i32) -> Iterator([] T) {
 }
 
 
+#doc """
+"""
+group_by :: #match #local {}
+
+#overload
+group_by :: macro (arr: [] $T, comp: (T, T) -> bool, allocator := context.allocator) -> [..] [] T {
+    return #this_package.group_by(arr, [a, b](comp(a, b)), allocator);
+}
+
+#overload
+group_by :: macro (arr_: [] $T, comp: Code, allocator := context.allocator) -> [..] [] T {
+    out := make([..] [] T, allocator);
+    start := 0;
+    arr := arr_;
+    for i: 1 .. arr.count {
+        if !#unquote comp(arr[start], arr[i]) {
+            out << arr[start .. i];
+            start = i;
+        }
+    }
+
+    out << arr[start .. arr.count];
+    return out;
+}
+
+
+
 #local HasEquals :: interface (t: $T) {
     { t == t } -> bool;
 }
diff --git a/core/std.onyx b/core/std.onyx
index 75d74d65..ab028a03 100644
--- a/core/std.onyx
+++ b/core/std.onyx
@@ -54,11 +54,11 @@ use runtime
 #load "./test/testing"
 
 #load "./time/time"
+#load "./time/date"
 
 #load "./misc/arg_parse"
 #load "./misc/method_ops"
 
-#load "./time/date"
 #load "./encoding/base64"
 #load "./encoding/hex"
 #load "./encoding/utf8"
-- 
2.25.1