class RuboCop::Cop::Style::FileWrite


File.binwrite(filename, content)
# good
end
f.write(content)
File.open(filename, ‘wb’) do |f|
File.open(filename, ‘wb’).write(content)
# bad
## binary mode
@example
File.write(filename, content)
# good
end
f.write(content)
File.open(filename, ‘w’) do |f|
File.open(filename, ‘w’).write(content)
# bad
## text mode
@example
Favor ‘File.(bin)write` convenience methods.

def evidence(node) 

def evidence(node)
  file_open?(node) do |filename, mode|
    file_open_write?(node.parent) do |content|
      yield(filename, mode, content, node.parent)
    end
  end
end

def file_open_write?(node) 

def file_open_write?(node)
  content = send_write?(node) || block_write?(node) do |block_arg, lvar, write_arg|
    write_arg if block_arg == lvar
  end
  yield(content) if content
end

def on_send(node) 

def on_send(node)
  evidence(node) do |filename, mode, content, write_node|
    message = format(MSG, write_method: write_method(mode))
    add_offense(write_node, message: message) do |corrector|
      range = range_between(node.loc.selector.begin_pos, write_node.loc.expression.end_pos)
      replacement = "#{write_method(mode)}(#{filename.source}, #{content.source})"
      corrector.replace(range, replacement)
    end
  end
end

def write_method(mode) 

def write_method(mode)
  mode.end_with?('b') ? :binwrite : :write
end