Fix Style/FormatString.

Library/.rubocop_todo.yml

@@ -119,13 +119,6 @@ Style/ConstantName:
   Exclude:
     - 'Homebrew/os/mac.rb'
 
-# Offense count: 1
-# Configuration parameters: EnforcedStyle, SupportedStyles.
-# SupportedStyles: format, sprintf, percent
-Style/FormatString:
-  Exclude:
-    - 'Homebrew/formula.rb'
-
 # Offense count: 13
 # Configuration parameters: AllowedVariables.
 Style/GlobalVars:

Library/Homebrew/formula.rb

@@ -1668,7 +1668,7 @@ class Formula
 
     @exec_count ||= 0
     @exec_count += 1
-    logfn = "#{logs}/#{active_log_prefix}%02d.%s" % [@exec_count, File.basename(cmd).split(" ").first]
+    logfn = format("#{logs}/#{active_log_prefix}%02d.%s", @exec_count, File.basename(cmd).split(" ").first)
     logs.mkpath
 
     File.open(logfn, "w") do |log|