class VhdlHelper

# File lib/vhdl_helper.rb, line 11
def initialize
  puts "-- "+"="*60
  puts "-- VHDL Helper. #{VERSION}. JC Le Lann 2017-2018"
  puts "-- "+"="*60
  @date = Time.now.strftime('%c')
  @options={}
end

# File lib/vhdl_helper.rb, line 19
def analyze_options args
  args << "-h" if args.empty?

  opt_parser = OptionParser.new do |opts|
    opts.banner = "Usage: vhdl_help <keyword>"

    opts.on("-k", "--keywords" ,"list concepts handled for far") do |n|
      show_keywords
      abort
    end

    opts.on("-gen", "generates a VHDL file") do |n|
      @options[:gen]=true
    end

    opts.on("-v","--version", "Prints version") do |n|
      puts VERSION
      abort
    end

    opts.on("-h", "--help", "Prints this help") do
      puts "Provides basic code examples in VHDL"
      puts opts
      exit
    end
  end

  begin
    opt_parser.parse!(args)
    @args=args
  rescue Exception => e
    #puts e
    #puts e.backtrace
    exit
  end
end

# File lib/vhdl_helper.rb, line 109
def find_closer word
  files=Dir[__dir__+"/templates/*.vhd"].collect{|f| File.basename(f,'.vhd')}
  concept_h=files.inject({}){|h,name| h[name]=name.similar(word);h}
end

# File lib/vhdl_helper.rb, line 93
def generate what
  concept_h=find_closer(what)
  concept=concept_h.sort_by{|k,v| v}.reverse.first
  concept,value=concept
  # puts "closer concept : #{concept}"
  filename=__dir__+"/templates/#{concept}.vhd"
  unless value > 50.0
    puts "Sorry...I cannot help you concerning '#{what}'"
  else
    template=IO.read(filename)
    renderer = ERB.new(template,nil,'>')
    code = renderer.result(binding)
    write_file code,"#{what}.vhd"
  end
end

# File lib/vhdl_helper.rb, line 72
def header filename
  code=[]
  code << "-- generated : #{@date}"
  code << "-- design    : #{filename}"
  code << "-- author    : "
  code << "-- "+"="*60
  code.join("\n")
end

# File lib/vhdl_helper.rb, line 57
def help
  @args.each{|arg| generate(arg)}
end

# File lib/vhdl_helper.rb, line 61
def show_keywords
  puts "Here are the keywords I know about :"
  path=__dir__+"/templates/*.vhd"
  files=Dir[path]
  concepts=files.collect{|filename| filename.split("/").last.match(/(.*).vhd/)[1]}
  concepts.sort!
  concepts.each do |concept|
    puts "- #{concept}"
  end
end

# File lib/vhdl_helper.rb, line 81
def write_file code,filename
  vhdl=[]
  vhdl << header(filename)
  vhdl << code
  vhdl=vhdl.join("\n")
  puts vhdl
  if @options[:gen]
    File.open(filename,'w'){|f| f.puts vhdl}
    puts "VHDL code written in : #{filename}"
  end
end