From 60db35096f23b0d0011e934e63f4aea47fc39811 Mon Sep 17 00:00:00 2001
From: Max Eisner <4730112+max-ae@users.noreply.github.com>
Date: Sun, 31 Jul 2022 21:29:50 +0200
Subject: [PATCH] simplify and comment dangling comma handling

---
 Library/Homebrew/rubocops/lines.rb | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/Library/Homebrew/rubocops/lines.rb b/Library/Homebrew/rubocops/lines.rb
index 8d767a738c..e065e2f28b 100644
--- a/Library/Homebrew/rubocops/lines.rb
+++ b/Library/Homebrew/rubocops/lines.rb
@@ -527,10 +527,8 @@ module RuboCop
           offending_node(offenses.last)
           replacement = if (%w[:bash :zsh :fish] - shells).empty?
             @offensive_node.source.sub(/shells: \[(:bash|:zsh|:fish)\]/, "")
-                           .gsub(",,", ",")
-                           .sub(", )", ")")
-                           .sub("(, ", "(")
-                           .sub("()", "")
+                           .sub(", )", ")") # clean up dangling trailing comma
+                           .sub("(, ", "(") # clean up dangling leading comma
           else
             @offensive_node.source.sub(/shells: \[(:bash|:zsh|:fish)\]/,
                                        "shells: [#{shells.join(", ")}]")