Parsing aspell CLI output with Ruby for TinyMCE

check_spell.rb

# See https://stackoverflow.com/a/63740582/1415262

class TinymceController < ApplicationController
  skip_forgery_protection

  respond_to :json

  def spellcheck
    suggestions = check_spelling_new(
      spellcheck_params[:text],
      spellcheck_params[:lang]
    )

    render json: {words: suggestions}
  end

  private

  def spellcheck_params
    params.permit(:method, :lang, :text)
  end

  def check_spelling_new(text, lang)
    suggestions = {}

    spell_check_response = `echo "#{text}" | aspell -a -l #{lang}`

    if spell_check_response.present?
      spelling_errors = spell_check_response.split(' ').slice(1..-1)

      spelling_errors.length.times do |i|
        spelling_errors[i].strip!

        if spelling_errors[i].to_s.start_with?('&')
          match_data = spelling_errors[i + 1]
          suggestion_count = spelling_errors[i + 2].to_i

          suggestions[match_data] ||= []

          suggestion_count.times do |k|
            suggestions[match_data] << spelling_errors[i + k + 4].gsub(',', '')
          end
        end
      end
    end

    suggestions
  end
end