gistfile1.rb

msg = ["hello","world","replace","me","with","this\n","now!"]
filename = "test_me"

def load_lines filename
  lines = []
  file = File.open(filename,"r")
  file.each_line do |f|
    lines.push(f)
  end
  lines
end

lines = load_lines(filename)

def build_sectors blocks, lines
  sectors = []
  lines.each_with_index do |l,i|
    if l.match("file: ") && (blocks[0] - 1) == i
      section = {
        :file => load_lines(l.split(":").last.strip()),
        :begin => blocks.shift(),
        :end => blocks.shift()
      }
      sectors.push(section)
    end
  end
  return sectors
end


def find_blocks(lines)
  blocks = []
  lines.each_with_index do |l,i|
    if l.match("```")
      blocks.push(i)
    end
  end
  blocks
end

def insert_msg lines, sector, offset
  start = sector[:begin] + 1 + offset
  finish = sector[:end] + offset
  sector[:file].each.with_index(start) do |m,i|
    if i >= finish
      lines.insert(i,"\n")
      offset += 1
    end
    lines[i] = m
  end
  return lines, offset
end

blocks = find_blocks(lines)
sectors = build_sectors(blocks,lines)
offset = 0
sectors.each do |s|
  lines, offset = insert_msg(lines,s,offset)
end

result = File.open("result","w")
lines.each do |l|
  result.write(l)
end

result.close()