Class: TTY::File::CompareFiles

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/tty/file/compare_files.rb

Instance Method Summary collapse

Constructor Details

#initialize(format: :unified, header: true, context_lines: 5, verbose: true, color: :green, noop: false, diff_colors: nil) ⇒ CompareFiles

Returns a new instance of CompareFiles.



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# File 'lib/tty/file/compare_files.rb', line 10

def initialize(format: :unified, header: true, context_lines: 5,
               verbose: true, color: :green, noop: false, diff_colors: nil)
  @format = format
  @header = header
  @context_lines = context_lines
  @verbose = verbose
  @color = color
  @noop = noop
  @diff_colors = diff_colors
end

Instance Method Details

#call(file_a, file_b, file_a_path, file_b_path) ⇒ Object

Compare files



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# File 'lib/tty/file/compare_files.rb', line 24

def call(file_a, file_b, file_a_path, file_b_path)
  differ = Differ.new(format: @format, context_lines: @context_lines)
  block_size = file_a.lstat.blksize
  file_a_chunk = file_a.read(block_size)
  file_b_chunk = file_b.read(block_size)
  hunks = differ.(file_a_chunk, file_b_chunk)

  return "" if file_a_chunk.empty? && file_b_chunk.empty?
  return "No differences found\n" if hunks.empty?

  output = []

  if %i[unified context old].include?(@format) && @header
    output << "#{differ.delete_char * 3} #{file_a_path}\n"
    output << "#{differ.add_char * 3} #{file_b_path}"
  end

  output << "\n" unless hunks =~ /\A\n+@@/
  output << hunks
  while !file_a.eof? && !file_b.eof?
    output << differ.(file_a.read(block_size), file_b.read(block_size))
  end
  color_diff_lines(output.join)
end