From b12230df66609249f8686cc7b3fb4407860a9f8c Mon Sep 17 00:00:00 2001
From: Daniele Palombo <387690+DanielePalombo@users.noreply.github.com>
Date: Fri, 7 Jul 2023 15:10:11 +0200
Subject: [PATCH] Fix encoding problem

incompatible character encodings: ASCII-8BIT and UTF-8

Taken from simplecov-ruby/simplecov#866
---
 .../formatters/html/formatter.rb              | 30 ++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/lib/deprecations_collector/formatters/html/formatter.rb b/lib/deprecations_collector/formatters/html/formatter.rb
index c51a974..66da1d6 100644
--- a/lib/deprecations_collector/formatters/html/formatter.rb
+++ b/lib/deprecations_collector/formatters/html/formatter.rb
@@ -54,7 +54,35 @@ def formatted_source_file(source_file)
         end
 
         def readfile(source_file)
-          File.open(filename(source_file), "rb", &:readlines)
+          load_source(filename(source_file))
+        end
+
+        def load_source(file_name)
+          lines = []
+          # The default encoding is UTF-8
+          File.open(file_name, "rb:UTF-8") do |file|
+            line = file.gets
+
+            # Check for shbang
+            if /\A#!/.match?(line)
+              lines << line
+              line = file.gets
+            end
+            return lines unless line
+
+            check_magic_comment(file, line)
+            lines.concat([line], file.readlines)
+          end
+
+          lines
+        end
+
+        def check_magic_comment(file, line)
+          # Check for encoding magic comment
+          # Encoding magic comment must be placed at first line except for shbang
+          if (match = /\A#\s*(?:-\*-)?\s*(?:en)?coding:\s*(\S+)\s*(?:-\*-)?\s*\z/.match(line))
+            file.set_encoding(match[1], "UTF-8")
+          end
         end
 
         def grouped(files)