Module: FileMutate::ReplaceContent::ClassMethods

Defined in:
lib/file_mutate/replace_content.rb

Instance Method Summary collapse

Instance Method Details

#replace_content_from(file_name, options = {}, &block) ⇒ Object Also known as: replace_content_in

replaces content found at replacement_expr with content resulting from yielding block File.replace_content_from ‘myfile.txt’, where => /HelloWorld/, with => ‘GoodBye’

Raises:

  • (ArgumentError) 


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# File 'lib/file_mutate/replace_content.rb', line 10

def replace_content_from file_name, options = {}, &block
  replacement_expr = options[:where] || options[:content]
  new_content = options[:with]

  begin
    replacement_expr = replacement_expr.to_regexp
  rescue
    raise ArgumentError, "Content to be replaced must be specified as either a String or Regexp in a :where or :content option"
  end

  file = get_file file_name

  # get existing file content
  content = file.read

  # return nil if no mathing replacement found
  return nil if !(content =~ replacement_expr)

  new_content ||= yield if block

  raise ArgumentError, "Content to be replaced with must be specified as a :with option or as a block" if !new_content

  # remove content that matches expr, by replacing with empty
  mutated_content = content.gsub replacement_expr, new_content

  # write mutated content as new file
  file.overwrite mutated_content

  true # signal success!
end