Insert Word (a file handling problem by Marcos Souza)

first_attempt.rb

#something like this, it's a snippet : 

f = File.open("plaintext.txt", "r+")

bytes_per_line = f.readline.length+1

f.seek(bytes_per_line*5, IO::SEEK_SET)

fourth_attempt.rb

def open_file_and_getlines(filename)
  lines = []
  File.open(filename) do |f|
    lines = f.readlines
  end
  lines
end

def seek_target_word(lines, word)
  pos = -1
  lines.each_with_index do |line, index|
    pos = index if line.split(" ").include?(word)
  end
  pos
end

def insert_new_word(lines, word, new_word, pos)
  target = -1
  lines[pos].split(" ").each_with_index do |element, index|
	   target = index if element == word
  end
  lines[pos] =  lines[pos].split.to_a.insert(target, new_word).join(" ")
  lines
end

def replace_file_contents(filename, lines)
  File.open(filename, "w+") do |f|
    lines.each do |line|
      f.puts line
    end
  end
end

print "Enter filename : "
fname = gets.chomp!
print "Enter target word : "
word = gets.chomp!
print "Enter word to be inserted : "
new_word = gets.chomp!
target_position = seek_target_word(open_file_and_getlines(fname), word)
if target_position >= 0
  modded_lines = insert_new_word(open_file_and_getlines(fname), word, new_word, target_position) 
  replace_file_contents(fname, modded_lines)
else
  puts "Word not found!"
end

second_attempt.rb

def open_file_and_get_lines(file_name)
	f = File.open(file_name, "r")
	a = f.readlines
	f.close
	a
end

def find_line_to_be_replaced(lines)
	lines.each_with_index do |line, index|
		tmp = line.split(" ")
		return index if tmp.include?("word")
	end 
	puts "Word not found!"
	exit
end

def clear_file_and_rewrite(file_name, lines)
	f = File.open(file_name, "w+")
	lines.each {|line| f.puts line}
	f.close
end

puts "Enter file name : "
fname = gets.chomp!
lines_arr = open_file_and_get_lines(fname)
index = find_line_to_be_replaced(lines_arr)
lines_arr[index] = "test test inserted word test test"
clear_file_and_rewrite(fname, lines_arr)

third_attempt.rb

def open_file(filename)
  lines_arr = []
  File.open(filename) do |f|
    lines_arr = f.readlines
  end
  lines_arr
end
 
def insert_and_replace_file(filename, lines)
  lines[5].insert(10, 'inserted ')
  File.open(filename, "w+") do |f|
    lines.each do |line|
      f.puts line
    end
  end
end
 
insert_and_replace_file("plaintext.txt", open_file("plaintext.txt"))