module StringInFile

add_beginning(str_to_add, path) click to toggle source

# File lib/string_in_file.rb, line 55
def self.add_beginning(str_to_add, path)
  path_old = "#{path}.old"
  system("mv #{path} #{path_old}")

  # Create a new file and write to it
  file_to_write = File.open(path, 'w')
  file_to_write.puts str_to_add
  File.foreach(path_old) do |line|
    file_to_write.puts line
  end
  file_to_write.close

  # Delete the old file
  system("rm -f #{path_old}")
end

add_end(str_to_add, path) click to toggle source

# File lib/string_in_file.rb, line 71
def self.add_end(str_to_add, path)
  path_old = "#{path}.old"
  system("mv #{path} #{path_old}")

  # Create a new file and write to it
  file_to_write = File.open(path, 'w')
  File.foreach(path_old) do |line|
    file_to_write.puts line
  end
  file_to_write.puts str_to_add
  file_to_write.close

  # Delete the old file
  system("rm -f #{path_old}")
end

present(str_to_find, path) click to toggle source

# File lib/string_in_file.rb, line 42
def self.present(str_to_find, path)
  begin
    # loop through each line in the file
    File.foreach(path) do |line|
      # does the line contain our string?
      return true if line.include?(str_to_find)
    end
    return false
  rescue
    return false
  end
end

read(path) click to toggle source

Put contents of file into string Thanks to Keith R. Bennett for suggesting this solution on ruby.mn. Please note that newlines are removed. Thus, this is designed to work with 1-line strings.

# File lib/string_in_file.rb, line 9
def self.read(path)
  str_output = File.readlines(path).join('')
  str_output = str_output.delete("\n")
end

replace(string1, string2, path) click to toggle source

Replace all instances of string1 in a file with string2 If string1 does not exist in the file, or if the file does not exist, no action is taken.

# File lib/string_in_file.rb, line 22
def self.replace(string1, string2, path)
  path_old = "#{path}.old"
  system("mv #{path} #{path_old}")

  # Create a new file and write to it
  file_to_write = File.open(path, 'w')
  File.foreach(path_old) do |line|
    # does the line contain our string?
    if line.include?(string1)
      file_to_write.puts line.gsub!(string1, string2)
    else
      file_to_write.puts line
    end
  end
  file_to_write.close

  # Delete the old file
  system("rm -f #{path_old}")
end

write(str_to_write, path) click to toggle source

Writes the value of a string into a file

# File lib/string_in_file.rb, line 15
def self.write(str_to_write, path)
  File.open(path, 'w') { |f| f.write(str_to_write) }
end

Constants

Public Class Methods