Module: Stairs::Util::FileMutation

Defined in:
lib/stairs/util/file_mutation.rb

Class Method Summary collapse

Class Method Details

.remove(pattern, filename) ⇒ Object 



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# File 'lib/stairs/util/file_mutation.rb', line 18

def remove(pattern, filename)
  return unless File.exists? filename

  contents = File.read filename
  if contents =~ pattern
    contents.slice!(pattern)
    write contents, filename
  end
end

.replace_or_append(pattern, string, filename) ⇒ Object 



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# File 'lib/stairs/util/file_mutation.rb', line 5

def replace_or_append(pattern, string, filename)
  if File.exists? filename
    contents = File.read filename
    if contents =~ pattern
      contents.sub! pattern, string
      write contents, filename
      return
    end
  end

  write_line string, filename
end

.write(string, filename) ⇒ Object 



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# File 'lib/stairs/util/file_mutation.rb', line 38

def write(string, filename)
  File.open filename, "w+" do |file|
    file.puts string
  end
end

.write_line(string, filename) ⇒ Object 



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# File 'lib/stairs/util/file_mutation.rb', line 28

def write_line(string, filename)
  File.open filename, "a+" do |file|
    # ensure file ends with newline before appending
    last_line = file.each_line.reduce("") { |m, l| m = l }
    file.puts "" unless last_line == "" || last_line =~ /(.*)\n/

    file.puts string
  end
end