From 8ffaf5a34181aa1b2e82717d485ac846d6089e11 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Valim?= <jose.valim@dashbit.co>
Date: Wed, 14 May 2025 09:39:31 +0200
Subject: [PATCH 1/2] Add String.lines/1

---
 lib/elixir/lib/string.ex | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/lib/elixir/lib/string.ex b/lib/elixir/lib/string.ex
index 626e7d259b..fc375a1ac8 100644
--- a/lib/elixir/lib/string.ex
+++ b/lib/elixir/lib/string.ex
@@ -574,6 +574,38 @@ defmodule String do
     end
   end
 
+  @doc ~S"""
+  Returns the list of lines in a string, preserving their line endings.
+
+  If you would like the lines without their line endings, use
+  `String.split(string, ["\r\n", "\n"])`.
+
+  ## Examples
+
+      iex> String.lines("foo\r\nbar\r\nbaz")
+      ["foo\r\n", "bar\r\n", "baz"]
+
+      iex> String.lines("foo\nbar\nbaz")
+      ["foo\n", "bar\n", "baz"]
+
+      iex> String.lines("")
+      [""]
+
+  """
+  @doc since: "1.19.0"
+  def lines(string) do
+    lines(string, <<>>)
+  end
+
+  def lines(<<?\n, rest::binary>>, acc),
+    do: [<<acc::binary, ?\n>> | lines(rest, <<>>)]
+
+  def lines(<<char, rest::binary>>, acc),
+    do: lines(rest, <<acc::binary, char>>)
+
+  def lines(<<>>, acc),
+    do: [acc]
+
   @doc """
   Returns an enumerable that splits a string on demand.
 

From 17e41d020959ce2cb7a1ca7450e1a1e52b08ea0f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Valim?= <jose.valim@dashbit.co>
Date: Wed, 14 May 2025 09:42:16 +0200
Subject: [PATCH 2/2] Private

---
 lib/elixir/lib/string.ex | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/elixir/lib/string.ex b/lib/elixir/lib/string.ex
index fc375a1ac8..fd9ddd6d5b 100644
--- a/lib/elixir/lib/string.ex
+++ b/lib/elixir/lib/string.ex
@@ -597,13 +597,13 @@ defmodule String do
     lines(string, <<>>)
   end
 
-  def lines(<<?\n, rest::binary>>, acc),
+  defp lines(<<?\n, rest::binary>>, acc),
     do: [<<acc::binary, ?\n>> | lines(rest, <<>>)]
 
-  def lines(<<char, rest::binary>>, acc),
+  defp lines(<<char, rest::binary>>, acc),
     do: lines(rest, <<acc::binary, char>>)
 
-  def lines(<<>>, acc),
+  defp lines(<<>>, acc),
     do: [acc]
 
   @doc """