Convert Stimulus 1.x target syntax to Stimulus 2.0 target syntax

convert_stimulus_targets.rb

# Convert Stimulus 1.x target syntax to Stimulus 2.0 target syntax
#
# ack data-target app/views | cut -f 1 -d : | sort -u | while read FILE; do ruby convert_targets.rb $FILE; done
# ack data app/views | grep target: | cut -f 1 -d : | sort -u | while read FILE; do ruby convert_targets.rb $FILE; done

unless filename = ARGV[0]
  puts "Filename is required"
  exit(-1)
end

new_content = ""

File.readlines(filename).each do |line|
  if captures = line.match(/data-target="([^\.]+)\.([a-zA-Z-]+)"/)
    new = %Q{data-#{captures[1]}-target="#{captures[2]}"}
    new_content << line.gsub(captures[0], new)
  elsif captures = line.match(/target: "([a-z-]+)\.([a-zA-Z-]+)"/)
    new = %Q{#{captures[1].gsub("-", "_")}_target: "#{captures[2]}"}
    new_content << line.gsub(captures[0], new)
  else
    new_content << line
  end
end

File.write(filename, new_content)