brew/Library/Homebrew/language/perl.rb

# typed: true
# frozen_string_literal: true

module Language
  # Helper functions for Perl formulae.
  #
  # @api public
  module Perl
    # Helper module for replacing `perl` shebangs.
    module Shebang
      module_function

      def detected_perl_shebang(formula = self)
        perl_path = if formula.uses_from_macos_elements&.include? "perl"
          "/usr/bin/perl"
        elsif formula.deps.map(&:name).include? "perl"
          Formula["perl"].opt_bin/"perl"
        else
          raise "Cannot detect Perl shebang: formula does not depend on Perl."
        end

        Utils::Shebang::RewriteInfo.new(
          %r{^#! ?/usr/bin/(env )?perl$},
          20, # the length of "#! /usr/bin/env perl"
          perl_path,
        )
      end
    end
  end
end