jdhuntington/watch-markdown-in-browser.rb

## watch-markdown-in-browser.rb
#!/usr/bin/env ruby

require 'tempfile'
require 'rubygems'
require 'kramdown'

abort "Usage: #{__FILE__} <target file path>" unless ARGV[0]

TARGET_FILE = File.expand_path(ARGV[0])

OUTPUT_FILE = begin
                f = Tempfile.new('markdown')
                f.close
                File.expand_path(f.path + ".html")
              ensure
                f.unlink
              end

# Fetch bootstrap css if it doesn't exist
BOOTSTRAP_FILE_LOCATION = begin
                            f = Tempfile.new('bootstrap.css')
                            f.close
                            File.expand_path(f.path + ".css")
                          ensure
                            f.unlink
                          end
BOOTSTRAP_URL = "http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/2.0.4/css/bootstrap.min.css"

def open_in_browser
  `open #{OUTPUT_FILE}`
end

def ensure_bootstrap_local
  unless File.exist?(BOOTSTRAP_FILE_LOCATION)
    out = `curl -s #{BOOTSTRAP_URL} > #{BOOTSTRAP_FILE_LOCATION}`
  end
end

def body
  Kramdown::Document.new(File.read(TARGET_FILE)).to_html
end

def header
  <<EOS
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>#{ARGV[0].inspect} preview</title>
  <link href="file://#{BOOTSTRAP_FILE_LOCATION}" rel="stylesheet">
<head><body><div class="container">
EOS
end

def footer
  "</div></body></html>"
end

def convert_target
  File.open(OUTPUT_FILE, 'w') do |f|
    f.print header
    f.print body
    f.print footer
  end
end

filestat = nil

ensure_bootstrap_local
STDERR.puts "Watching #{TARGET_FILE} for changes."
while true
  if (new_filestat = File.stat(TARGET_FILE)) != filestat
    filestat = new_filestat
    convert_target
    open_in_browser
  end
  sleep 0.3
end
	#!/usr/bin/env ruby

	require 'tempfile'
	require 'rubygems'
	require 'kramdown'

	abort "Usage: #{__FILE__} <target file path>" unless ARGV[0]

	TARGET_FILE = File.expand_path(ARGV[0])

	OUTPUT_FILE = begin
	f = Tempfile.new('markdown')
	f.close
	File.expand_path(f.path + ".html")
	ensure
	f.unlink
	end

	# Fetch bootstrap css if it doesn't exist
	BOOTSTRAP_FILE_LOCATION = begin
	f = Tempfile.new('bootstrap.css')
	f.close
	File.expand_path(f.path + ".css")
	ensure
	f.unlink
	end
	BOOTSTRAP_URL = "http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/2.0.4/css/bootstrap.min.css"

	def open_in_browser
	`open #{OUTPUT_FILE}`
	end

	def ensure_bootstrap_local
	unless File.exist?(BOOTSTRAP_FILE_LOCATION)
	out = `curl -s #{BOOTSTRAP_URL} > #{BOOTSTRAP_FILE_LOCATION}`
	end
	end

	def body
	Kramdown::Document.new(File.read(TARGET_FILE)).to_html
	end

	def header
	<<EOS
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>#{ARGV[0].inspect} preview</title>
	<link href="file://#{BOOTSTRAP_FILE_LOCATION}" rel="stylesheet">
	<head><body><div class="container">
	EOS
	end

	def footer
	"</div></body></html>"
	end

	def convert_target
	File.open(OUTPUT_FILE, 'w') do \|f\|
	f.print header
	f.print body
	f.print footer
	end
	end

	filestat = nil

	ensure_bootstrap_local
	STDERR.puts "Watching #{TARGET_FILE} for changes."
	while true
	if (new_filestat = File.stat(TARGET_FILE)) != filestat
	filestat = new_filestat
	convert_target
	open_in_browser
	end
	sleep 0.3
	end