module Pry::CommandBase::CommandBaseHelpers

def bold(text)
  Pry.color ? "\e[1m#{text}\e[0m" : text
end

def command_dependencies_met?(options)
  return true if !options[:requires_gem]
  Array(options[:requires_gem]).all? do |g|
    gem_installed?(g)
  end
end

def create_command_stub(names, description, options, block)
  Array(names).each do |name|
    commands[name] = {
      :description => "Not available. Execute `#{name}` command for more information.",
      :action => stub_proc(name, options),
      :stub_info => options
    }
  end
end

def gem_installed?(gem_name)
  require 'rubygems'
  !!Gem.source_index.find_name(gem_name).first
end

def heading(text)
  text = "#{text}\n--"
  Pry.color ? "\e[1m#{text}\e[0m": text
end

def lesspipe(*args)
  if args.any? and args.last.is_a?(Hash)
    options = args.pop
  else
    options = {}
  end
  
  output = args.first if args.any?
  
  params = []
  params << "-R" unless options[:color] == false
  params << "-S" unless options[:wrap] == true
  params << "-F" unless options[:always] == true
  if options[:tail] == true
    params << "+\\>"
    $stderr.puts "Seeking to end of stream..."
  end
  params << "-X"
  
  IO.popen("less #{params * ' '}", "w") do |less|
    if output
      less.puts output
    else
      yield less
    end
  end
end      

def page_size
  27
end

def simple_pager(text)
  text_array = text.lines.to_a
  text_array.each_slice(page_size) do |chunk|
    output.puts chunk.join
    break if chunk.size < page_size
    if text_array.size > page_size
      output.puts "\n<page break> --- Press enter to continue ( q<enter> to break ) --- <page break>" 
      break if $stdin.gets.chomp == "q"
    end
  end
end

def stagger_output(text)
  if text.lines.count < page_size
    output.puts text
    return
  end
  lesspipe { |less| less.puts text }
rescue Exception
  simple_pager(text)
end

def stub_proc(name, options)
  gems_needed = Array(options[:requires_gem])
  gems_not_installed = gems_needed.select { |g| !gem_installed?(g) }
  proc do
    output.puts "\n`#{name}` requires the following gems to be installed: `#{gems_needed.join(", ")}`"
    output.puts "Command not available due to dependency on gems: `#{gems_not_installed.join(", ")}` not being met."
    output.puts "Type `install #{name}` to install the required gems and activate this command."
  end
end