#!/usr/bin/env ruby
# encoding: utf-8

=begin

quick little script to generate individual files from a single file such that 
they can be used within https://github.com/cmatheson/cli-present

syntax notes:

* lines starting with `##` are formated as headings
* lines starting with `sh` are created as shell scripts

* `\\` is broken into multiple lines within the same outputted file

./build.rb file_with_notes output_dir

replace `output_dir` with `-p` to print to stdout

=end
BUFFER = 12

def heading? line
  line.match /##/
end

def breaks? line
  line.match /\\/
end

def shell? line
  line.match /^sh\s/
end

def shellit line
  line = line[3..-1]
  "#!/usr/bin/env bash\n#{line}"
end

def breakem line
  parts = line.split /\\/
  parts.each &:strip!
  parts.join("\n")
end


def buffer length
  b = "|"
  length.times {|x| b += ' '}
  b += "|\n"
  b
end

def center line
  pad = (BUFFER / 2)
  b = ''
  pad.times {|x| b += ' '}
  "|#{b}#{line}#{b}|\n"
end


def heading_box line
  line = line.strip
  line = line[3..-1]
  l = line.length + BUFFER
  new_line = "+"
  l.times {|x| new_line += '-'}
  new_line += "+\n"
  b = buffer(l)
  output =  "#{new_line}#{b}#{center(line)}#{b}#{new_line}"
end

def build_name(count, shell)
  ext = shell ? '.sh' : ''
  fname = "%04d_slide%s" % [count, ext]
  "#{SLIDES_DIR}/#{fname}"
end


NOTES_PATH = ARGV[0] || 'notes.txt'
SLIDES_DIR = ARGV[1] || 'slides'

write = true
if SLIDES_DIR == '-p'
  write = false
end

if write
  `rm -rf #{SLIDES_DIR}`
  `mkdir #{SLIDES_DIR}`
end

count = 0
lines = File.readlines(NOTES_PATH).each do |line|
  count += 1
  shell = false
  line = line.strip
  if line.size > 0
    if (heading? line)
      line = heading_box line
    end
    if (breaks? line)
      line = breakem line
    end
    if shell? line
      shell = true
      line = shellit line
    end
    if write
      name = build_name count, shell
      File.open(name, 'w') {|f| f.write line }
    else
      puts "#{line}\n\n"
    end
  end
end

if write
  Dir["#{SLIDES_DIR}/**/*.sh"].each do |f|
    `chmod a+x #{f}`
  end
end