figbot/figbot.rb

require 'figlet'
require 'sinatra'
require 'dotenv/load'

def fig(input)
  opts = parse(input)

  banners = []

  font = Figlet::Font.new(File.expand_path('./lib/banner.flf'))
  figlet = Figlet::Typesetter.new(font)

  chunks = opts[:message].chars.to_a.each_slice(5).to_a.map{|chunk| chunk.join}

  chunks.each do |chunk|
    banner = figlet[chunk.strip].gsub(/#/, opts[:ink]).gsub(/ /, opts[:space])

    unless uses_emoji(opts)
      banner = "```#{banner}```"
    end

    banners << banner
  end

  banners.join("\n")
end

def parse(input)
  opts = {
    :message => String.new,
    :space => " ",
    :ink => "#",
  }

  position = 0

  encountered_options = false

  while position < input.length
    if m = input.slice(position..-1).match(/^space=(\S+)/)
      encountered_options = true
      opts[:space] = m[1].strip
      position += m[0].length
    elsif m = input.slice(position..-1).match(/^ink=(\S+)/)
      encountered_options = true
      opts[:ink] = m[1].strip
      position += m[0].length
    elsif m = input.slice(position..-1).match(/^font=(\S+)/)
      encountered_options = true
      opts[:font] = m[1].strip
      position += m[0].length
    else
      if not encountered_options
        opts[:message] << input[position]
      end
      position += 1
    end

  end

  opts[:message] = opts[:message].strip

  opts
end

def uses_emoji(opts)
  (opts[:space][0] == ':' and opts[:space][-1] == ':') or (opts[:ink][0] == ':' and opts[:ink][-1] == ':')
end

post '/' do
    content_type :json
    {
      response_type: 'in_channel',
      text: fig(params[:text])
    }.to_json
end