module Rails::Command::CredentialsCommand::Diffing

def configure_diffing_driver
  system "git config diff.rails_credentials.textconv '#{executable(:diff)}'"
  say "Configured Git diff driver for credentials."
end

def diffing_driver_configured?
  system "git config --get diff.rails_credentials.textconv", out: File::NULL
end

def disenroll_project_from_credentials_diffing
  if enrolled_in_credentials_diffing?
    gitattributes.write(gitattributes.read.gsub(GITATTRIBUTES_ENTRY, ""))
    gitattributes.delete if gitattributes.empty?
    say "Disenrolled project from credentials file diffing!"
  else
    say "Project is not enrolled in credentials file diffing."
  end
end

def enroll_project_in_credentials_diffing
  if enrolled_in_credentials_diffing?
    say "Project is already enrolled in credentials file diffing."
  else
    gitattributes.write(GITATTRIBUTES_ENTRY, mode: "a")
    say "Enrolled project in credentials file diffing!"
    say ""
    say "Rails will configure the Git diff driver for credentials when running `#{executable(:edit)}`. See `#{executable(:help)}` for more information."
  end
end

def enrolled_in_credentials_diffing?
  gitattributes.file? && gitattributes.read.include?(GITATTRIBUTES_ENTRY)
end

def ensure_diffing_driver_is_configured
  configure_diffing_driver if enrolled_in_credentials_diffing? && !diffing_driver_configured?
end

def gitattributes
  @gitattributes ||= (Rails::Command.root || Pathname.pwd).join(".gitattributes")
end