Modify case-sensitive filenames on macOS

downcase_filenames.rb

#!/usr/bin/env ruby

# Converts all characters in a filename to lowercase on macOS, where by default
# the filesystem is case-insensitive.

# Usage:
# Pass a glob pattern to the script:
# ruby downcase_filenames.rb spec/cassettes/**/*.yml

begin
  `git config core.ignorecase false`
  
  Dir[ARGV[0]].each do |cassette_file|
    downcased_file = cassette_file.downcase
    `git mv --force #{cassette_file} #{downcased_file}`
  end
  
ensure
  `git config core.ignorecase true`
end