module DiscoverTabs

# File lib/discover_tabs.rb, line 71
def cmdline_run(argv)
  options = parse_argv(argv)

  files_with_tabs = []
  options[:files].each do |full_path|
    files_with_tabs += files_with_tab_indenting(full_path)
  end

  files_with_tabs.each { |file| puts Pathname.new(file).cleanpath.to_s }

  if options[:replace_tabs]
    replace_tabs_in_files(files_with_tabs, options[:replace_tabs])
  end

  files_with_tabs.empty? ? 1 : 0
end

# File lib/discover_tabs.rb, line 37
def file_has_tabs_indenting?(filename)
  File.readlines(filename).each do |line|
    return true if line =~ /^\t+/
  end
  false
end

# File lib/discover_tabs.rb, line 9
def files_with_tab_indenting(full_path)
  filename = File.basename(full_path)
  dirname = File.dirname(full_path)

  files_with_tabs = []
  if File.directory?(full_path)
    files_with_tabs += files_with_tab_indenting_in_dir(full_path)
  elsif filename.include?("*")
    files_with_tabs += files_with_tab_indenting_in_dir(dirname, filename)
  else
    files_with_tabs << full_path if file_has_tabs_indenting?(full_path)
  end
  files_with_tabs
end

# File lib/discover_tabs.rb, line 24
def files_with_tab_indenting_in_dir(dir, pattern = "*")
  files_with_tabs = []
  Dir["#{dir}/**/#{pattern}"].each do |file|
    begin
      unless File.directory?(file) || File.binary?(file)
        files_with_tabs << file if file_has_tabs_indenting?(file)
      end
    rescue ArgumentError
    end
  end
  files_with_tabs
end

# File lib/discover_tabs.rb, line 44
def parse_argv(argv)
  options = {}

  opt_parser = OptionParser.new do |opts|
    opts.banner = "usage: discover_tabs [options] [filename|directory]"

    opts.on("-r N", Integer, "Replace tabs intending with N spaces") do |n|
      options[:replace_tabs] = n
    end

    opts.on_tail("-h", "--help", "Show this message") do
      puts opts.to_s
      exit(0)
    end
  end
  opt_parser.parse!(argv)

  options[:files] = argv
  options[:files] = ["."] if argv.empty?


  options
rescue OptionParser::InvalidOption => error
  puts error.message
  exit 1
end

# File lib/discover_tabs.rb, line 88
def replace_tabs_in_files(files, amount_of_spaces_per_tab)
  files.each do |file|
    content = File.read(file)
    new_content = replace_tabs_with_spaces(content, amount_of_spaces_per_tab)
    File.write(file, new_content)
  end
end

# File lib/discover_tabs.rb, line 96
def replace_tabs_with_spaces(content, amount_of_spaces_per_tab)
  new_content = ""
  content.lines.each { |line| new_content += replace_tabs_with_spaces_on_line(line, amount_of_spaces_per_tab)}
  new_content
end

# File lib/discover_tabs.rb, line 102
def replace_tabs_with_spaces_on_line(string, amount_of_spaces_per_tab)
  new_string = string
  if string =~ /^(\t+)/
    replacement_spaces = " " * amount_of_spaces_per_tab * $1.size
    new_string = string.gsub(/^#{$1}/, replacement_spaces)
  end
  new_string
end