gistfile1.rb

#code_block_replacer
#A Search and Replace Utilty that insert source code into your document.
class CodeBlockReplacer
  
  def load_lines filename
    lines = []
    file = File.open(filename,"r")
    file.each_line do |f|
      lines.push(f)
    end
    lines
  end

  def build_sectors blocks, lines
    sectors = []
    lines.each_with_index do |l,i|
      if l.match("File: ") && (blocks[0] - 2) == 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

  def process_file input, output = input
    lines = load_lines(input)
    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(output,"w")
    lines.each do |l|
      result.write(l)
    end

    result.close()
  end
end