From c0bea10e669500c2521a513b009fc48827e0b78e Mon Sep 17 00:00:00 2001
From: Stefan Breunig <307954+breunigs@users.noreply.github.com>
Date: Sat, 27 Jul 2024 14:11:31 +0200
Subject: [PATCH] fix IO.Util.staleness when all target(s) or dependencies(s)
 were absent

---
 lib/util/io_util.ex | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/util/io_util.ex b/lib/util/io_util.ex
index f6dd6403..c158cec7 100644
--- a/lib/util/io_util.ex
+++ b/lib/util/io_util.ex
@@ -112,10 +112,10 @@ defmodule Util.IO do
     dep = Path.relative_to_cwd(dep_mod.newest.path)
 
     cond do
-      target_mod == nil ->
+      target_mod.oldest == nil ->
         {true, "target #{Path.relative_to_cwd(target)} doesn't exist"}
 
-      dep_mod == nil ->
+      dep_mod.newest == nil ->
         deps = dependencies |> Enum.map(&Path.relative_to_cwd/1) |> Enum.join(", ")
         {false, "none of the dependencies (#{deps}) exist"}
 
@@ -127,7 +127,9 @@ defmodule Util.IO do
     end
   end
 
-  defp modification_times(paths) do
+  @typep file_time :: %{path: binary(), mtime: integer()} | nil
+  @spec modification_times(binary() | [binary()]) :: %{oldest: file_time(), newest: file_time()}
+  def modification_times(paths) do
     paths
     |> List.wrap()
     |> Parallel.flat_map(&include_descendants/1)