Class: ShowoffUtils

Inherits:
Object
  • Object
show all
Defined in:
lib/showoff_utils.rb

Constant Summary collapse

HEROKU_PROCFILE = 
'Procfile'
HEROKU_GEMS_FILE = 
'Gemfile'
HEROKU_CONFIG_FILE = 
'config.ru'
TYPES = 
{
  :default      => lambda { |t,size,source,type| make_slide(t,"#{size} #{type}",source) },
  'title'       => lambda { |t,size,dontcare|    make_slide(t,size) },
  'bullets'     => lambda { |t,size,dontcare|    make_slide(t,"#{size} bullets incremental",["bullets","go","here"])},
  'smbullets'   => lambda { |t,size,dontcare|    make_slide(t,"#{size} smbullets incremental",["bullets","go","here","and","here"])},
  'code'        => lambda { |t,size,src|         make_slide(t,size,blank?(src) ? "    @@@ Ruby\n    code_here()" : src) },
  'commandline' => lambda { |t,size,dontcare|    make_slide(t,"#{size} commandline","    $ command here\n    output here")},
  'full-page'   => lambda { |t,size,dontcare|    make_slide(t,"#{size} full-page","![Image Description](image/ref.png)")},
}
EXTENSIONS = 
{
  'pl' => 'perl',
  'rb' => 'ruby',
  'erl' => 'erlang',
  # so not exhaustive, but probably good enough for now
}
REQUIRED_GEMS = 
%w(redcarpet showoff heroku)

Class Method Summary collapse

Class Method Details

.add_new_dir(dir) ⇒ Object

Adds the given directory to this presentation, appending it to the end of showoff.json as well



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# File 'lib/showoff_utils.rb', line 325

def self.add_new_dir(dir)
  puts "Creating #{dir}..."
  Dir.mkdir dir

  showoff_json = JSON.parse(File.read(ShowoffUtils.presentation_config_file))
  showoff_json["section"] = dir
  File.open(ShowoffUtils.presentation_config_file,'w') do |file|
    file.puts JSON.generate(showoff_json)
  end
  puts "#{ShowoffUtils.presentation_config_file} updated"
end

.add_slide(options) ⇒ Object

Adds a new slide to a given dir, giving it a number such that it falls after all slides in that dir. Options are:

:dir

  • dir where we put the slide (if omitted, slide is output to $stdout)

:name

  • name of the file, without the number prefix. (if omitted, a default is used)

:title

  • title in the slide. If not specified the source file name is used. If THAT is not specified, uses the value of :name. If THAT is not specified, a suitable default is used

:code

  • path to a source file to use as content (force :type to be ‘code’)

:number

  • true if numbering should be done, false if not

:type

  • the type of slide to create



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# File 'lib/showoff_utils.rb', line 299

def self.add_slide(options)

  add_new_dir(options[:dir]) if options[:dir] && !File.exist?(options[:dir])

  options[:type] = 'code' if options[:code]

  title = determine_title(options[:title],options[:name],options[:code])

  options[:name] = 'new_slide' if !options[:name]

  size,source = determine_size_and_source(options[:code])
  type = options[:type] || :default
  slide = TYPES[type].call(title,size,source)

  if options[:name]
    filename = determine_filename(options[:dir],options[:name],options[:number])
    write_file(filename,slide)
  else
    puts slide
    puts
  end

end

.adjust_size(lines, width) ⇒ Object

Determines a more optimal value for the size (e.g. small vs. smaller) based upon the size of the code being formatted.



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# File 'lib/showoff_utils.rb', line 398

def self.adjust_size(lines,width)
  size = ""
  # These values determined empircally
  size = "small" if width > 50
  size = "small" if lines > 15
  size = "smaller" if width > 57
  size = "smaller" if lines > 19
  puts "WARNING: some lines are too long and might be truncated" if width > 65
  puts "WARNING: your code is too long and may not fit on a slide" if lines > 23
  size
end

.blank?(string) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/showoff_utils.rb', line 337

def self.blank?(string)
  string.nil? || string.strip.length == 0
end

.clone(url, branch = nil, path = nil) ⇒ Object

clone a repo url, then run a provided block



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# File 'lib/showoff_utils.rb', line 235

def self.clone(url, branch=nil, path=nil)
  require 'tmpdir'
  Dir.mktmpdir do |dir|
    if branch
      system('git', 'clone', '-b', branch, '--single-branch', '--depth', '1', url, dir)
    else
      system('git', 'clone', '--depth', '1', url, dir)
    end

    dir = File.join(dir, path) if path
    Dir.chdir dir do
      yield if block_given?
    end
  end
end

.command(command, error = 'command failed') ⇒ Object 



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# File 'lib/showoff_utils.rb', line 662

def self.command(command, error='command failed')
  puts "Running '#{command}'..."
  system(command) or raise error
end

.create(dirname, create_samples, dirs = 'one') ⇒ Object 



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# File 'lib/showoff_utils.rb', line 34

def self.create(dirname,create_samples,dirs='one')
  FileUtils.mkdir_p(dirname)
  Dir.chdir(dirname) do
    dirs = dirs.split(',')

    if create_samples
      dirs.each do |dir|
        # create section
        FileUtils.mkdir_p(dir)

        # create markdown file
        File.open("#{dir}/00_section.md", 'w+') do |f|
          f.puts make_slide("Section Header", "center subsection")
        end
        File.open("#{dir}/01_slide.md", 'w+') do |f|
          f.puts make_slide("My Presentation")
        end
        File.open("#{dir}/02_slide.md", 'w+') do |f|
          f.puts make_slide("Bullet Points","bullets incremental",["first point","second point","third point"])
        end
      end
    end

    # Create asset directories
    FileUtils.mkdir_p('_files/share')
    FileUtils.mkdir_p('_images')

    # create showoff.json
    File.open(ShowoffUtils.presentation_config_file, 'w+') do |f|
      sections = dirs.collect {|dir| {"section" => dir} }
      f.puts JSON.pretty_generate({ "name" => "My Preso", "sections" => sections })
    end
  end
end

.create_file_if_needed(filename, force) ⇒ Object

Creates the given filename if it doesn’t exist or if force is true

filename - String name of the file to create force - if true, the file will always be created, if false, only create

if it's not there

block - takes a block that will be given the file handle to write

data into the file IF it's being created

Examples

create_file_if_needed("config.ru",false) do |file|
  file.puts "require 'showoff'"
  file.puts "run Showoff.new"
end

Returns true if the file was created



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# File 'lib/showoff_utils.rb', line 650

def self.create_file_if_needed(filename,force)
  if !File.exist?(filename) || force
    File.open(filename, 'w+') do |f|
      yield f
    end
    true
  else
    puts "#{filename} exists; not overwriting (see showoff help heroku)"
    false
  end
end

.create_gems_file(filename, password, force, formatter, header = nil) ⇒ Object

Creates the file that lists the gems for heroku

filename - String name of the file password - Boolean to indicate if we are setting a password force - Boolean to indicate if we should overwrite the existing file formatter - Proc/lambda that takes 1 argument, the gem name, and formats it for the file

This is so we can support both the old .gems and the new bundler Gemfile

header - Proc/lambda that creates any header information in the file

Returns a boolean indicating that we had to create the file or not.



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# File 'lib/showoff_utils.rb', line 626

def self.create_gems_file(filename,password,force,formatter,header=nil)
  create_file_if_needed(filename,force) do |file|
    file.puts header.call unless header.nil?
    REQUIRED_GEMS.each { |gem| file.puts formatter.call(gem) }
    file.puts formatter.call("rack") if password
  end
end

.default_style(dir = '.') ⇒ Object 



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# File 'lib/showoff_utils.rb', line 563

def self.default_style(dir = '.')
  get_config_option(dir, 'style', '')
end

.default_style?(style, dir = '.') ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/showoff_utils.rb', line 567

def self.default_style?(style, dir = '.')
  default = default_style(dir)
  style.split('/').last.sub(/\.css$/, '') == default
end

.determine_filename(slide_dir, slide_name, number) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 358

def self.determine_filename(slide_dir,slide_name,number)
  raise "Slide name is required" unless slide_name

  if number
    next_num   = find_next_number(slide_dir)
    slide_name = "#{next_num}_#{slide_name}"
  end

  if slide_dir
    filename = "#{slide_dir}/#{slide_name}.md"
  else
    filename = "#{slide_name}.md"
  end

  filename
end

.determine_size_and_source(code) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 341

def self.determine_size_and_source(code)
  size = ""
  source = ""
  if code
    source,lines,width = read_code(code)
    size = adjust_size(lines,width)
  end
  [size,source]
end

.determine_title(title, slide_name, code) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 387

def self.determine_title(title,slide_name,code)
  if blank?(title)
    title = slide_name
    title = File.basename(code) if code
  end
  title = "Title here" if blank?(title)
  title
end

.find_next_number(slide_dir) ⇒ Object

Finds the next number in the given dir to name a slide as the last slide in the dir.



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# File 'lib/showoff_utils.rb', line 377

def self.find_next_number(slide_dir)
  slide_dir ||= '.'
  max = Dir.glob("#{slide_dir}/*.md").collect do |f|
    next unless f =~ /^#{slide_dir}\/(\d+)/
    $1.to_i
  end.compact.max || 0

  sprintf("%02d", max+1)
end

.get_config_option(dir, option, default = nil) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 586

def self.get_config_option(dir, option, default = nil)
  index = File.join(dir, ShowoffUtils.presentation_config_file)
  if File.exist?(index)
    data = JSON.parse(File.read(index))
    if data.is_a?(Hash)
      if default.is_a?(Hash)
        default.merge(data[option] || {})
      else
        data[option] || default
      end
    end
  else
    default
  end
end

.github ⇒ Object

generate a static version of the site into the gh-pages branch



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# File 'lib/showoff_utils.rb', line 221

def self.github
  Showoff.do_static(nil)
  FileUtils.touch 'static/.nojekyll'
  `git add -f static`
  sha = `git write-tree`.chomp
  tree_sha = `git rev-parse #{sha}:static`.chomp
  `git read-tree HEAD`  # reset staging to last-commit
  ghp_sha = `git rev-parse gh-pages 2>/dev/null`.chomp
  extra = ghp_sha != 'gh-pages' ? "-p #{ghp_sha}" : ''
  commit_sha = `echo 'static presentation' | git commit-tree #{tree_sha} #{extra}`.chomp
  `git update-ref refs/heads/gh-pages #{commit_sha}`
end

.heroku(name, force = false, password = nil) ⇒ Object

name - String containing heroku name force - boolean if .gems/Gemfile and config.ru should be overwritten if they don’t exist password - String containing password to protect your heroku site; nil means no password protection



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# File 'lib/showoff_utils.rb', line 189

def self.heroku(name, force = false, password = nil)
  modified_something = create_gems_file(HEROKU_GEMS_FILE,
                                        !password.nil?,
                                        force,
                                        lambda{ |gem| "gem '#{gem}'" },
                                        lambda{ "source :rubygems" })

  create_file_if_needed(HEROKU_PROCFILE,force) do |file|
    modified_something = true
    file.puts 'bundle exec thin start -R config.ru -e production -p $PORT'
  end

  create_file_if_needed(HEROKU_CONFIG_FILE,force) do |file|
    modified_something = true
    file.puts 'require "showoff"'
    file.puts 'require "showoff/version"'
    if password.nil?
      file.puts 'run Showoff.new'
    else
      file.puts 'require "rack"'
      file.puts 'showoff_app = Showoff.new'
      file.puts 'protected_showoff = Rack::Auth::Basic.new(showoff_app) do |username, password|'
      file.puts	"\tpassword == '#{password}'"
      file.puts 'end'
      file.puts 'run protected_showoff'
    end
  end

  modified_something
end

.info(config, json = false) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 102

def self.info(config, json = false)
  ShowoffUtils.presentation_config_file = config
  showoff = Showoff.new!
  content = showoff.slides(false, true)
  dom     = Nokogiri::HTML(content)

  data = {}
  data['files']   = self.showoff_slide_files('.')
  data['images']  = dom.css('img').map {|img| img[:src].sub(/.\/image\/+/,'') }
  data['styles']  = Dir.glob('*.css')
  data['scripts'] = Dir.glob('*.js')

  # now grep through the styles and identify referenced images
  data['styles'].each do |style|
    File.readlines(style).each do |line|
      next unless line =~ /url\(\'(\S+)\'\)/
      data['images'] << $1
    end
  end

  if json
    puts JSON.pretty_generate(data)
  else
    data.each do |key, list|
      puts "#{key.capitalize}:"
      list.each {|file| puts "    * #{file}" }
      puts
    end
  end
end

.lang(source_file) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 609

def self.lang(source_file)
  ext = File.extname(source_file).gsub(/^\./,'')
  EXTENSIONS[ext] || ext
end

.make_slide(title, classes = "", content = nil) ⇒ Object

Makes a slide as a string.

title

title of the slide

classes

any “classes” to include, such as ‘smaller’, ‘transition’, etc.

content

slide content. Currently, if this is an array, it will make a bullet list. Otherwise the string value of this will be put in the slide as-is



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# File 'lib/showoff_utils.rb', line 263

def self.make_slide(title,classes="",content=nil)
  slide = "<!SLIDE #{classes}>\n"
  slide << "# #{title}\n"
  slide << "\n"
  if content
    if content.kind_of? Array
      content.each { |x| slide << "* #{x.to_s}\n" }
    else
      slide << content.to_s
    end
  end
  slide
end

.parse_options(option_string = "") ⇒ Object

Helper method to parse a comma separated options string and stores the result in a dictionrary

Example:

"tpl=hpi,title=Over the rainbow"

will be stored as

  { "tpl" => "hpi", "title" => "Over the rainbow" }



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# File 'lib/showoff_utils.rb', line 13

def self.parse_options(option_string="")
  result = {}

  if option_string
    option_string.split(",").each do |element|
      pair = element.split("=")
      result[pair[0]] = pair.size > 1 ? pair[1] : nil
    end
  end

  result
end

.pause_msg(dir = '.') ⇒ Object 



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# File 'lib/showoff_utils.rb', line 559

def self.pause_msg(dir = '.')
  get_config_option(dir, 'pause_msg', 'PAUSED')
end

.presentation_config_file ⇒ Object 



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# File 'lib/showoff_utils.rb', line 26

def self.presentation_config_file
  @presentation_config_file ||= 'showoff.json'
end

.presentation_config_file=(filename) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 30

def self.presentation_config_file=(filename)
  @presentation_config_file = filename
end

.read_code(source_file) ⇒ Object

Reads the code from the source file, returning the code, indented for markdown, as well as the number of lines and the width of the largest line



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# File 'lib/showoff_utils.rb', line 413

def self.read_code(source_file)
  code = "    @@@ #{lang(source_file)}\n"
  lines = 0
  width = 0
  File.open(source_file) do |code_file|
    code_file.readlines.each do |line|
      code += "    #{line}"
      lines += 1
      width = line.length if line.length > width
    end
  end
  [code,lines,width]
end

.showoff_legacy_sections(dir, data) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 477

def self.showoff_legacy_sections(dir, data)
  # each entry in sections can be:
  # - "filename.md"
  # - { "section": "filename.md" }
  # - { "section": "directory" }
  # - { "section": [ "array.md, "of.md, "files.md"] }
  # - { "include": "sections.json" }
  sections = {}
  counters = {}
  lastpath = nil

  data.map do |entry|
    next entry if entry.is_a? String
    next nil unless entry.is_a? Hash
    next entry['section'] if entry.include? 'section'

    section = nil
    if entry.include? 'include'
      file = entry['include']
      path = File.dirname(file)
      data = JSON.parse(File.read(file))
      if data.is_a? Array
        if path == '.'
          section = data
        else
          section = data.map do |source|
            "#{path}/#{source}"
          end
        end
      end
    end
    section
  end.flatten.compact.each do |entry|
    # We do this in two passes simply because most of it was already done
    # and I don't want to waste time on legacy functionality.

    # Normalize to a proper path from presentation root
    filename = File.expand_path(entry).sub(/^#{dir}\//, '')
    # and then strip out the locale directory, if there is one
    filename.sub!(/^(locales\/[\w-]+\/)/, '')
    locale = $1

    if File.directory? filename
      path = entry
      sections[path] ||= []
      Dir.glob("#{filename}/**/*.md").sort.each do |slidefile|
        fullpath = locale.nil? ? slidefile : "#{locale}/#{slidefile}"
        sections[path] << fullpath
      end
    else
      path = File.dirname(entry)

      # this lastpath business allows us to reference files in a directory that aren't
      # necessarily contiguous.
      if path != lastpath
        counters[path] ||= 0
        counters[path]  += 1
      end

      # now record the last path we've seen
      lastpath = path

      # and if there are more than one disparate occurences of path, add a counter to this string
      path = "#{path} (#{counters[path]})" unless counters[path] == 1

      sections[path] ||= []
      sections[path]  << filename
    end
  end

  sections
end

.showoff_markdown(dir = ".") ⇒ Object 



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# File 'lib/showoff_utils.rb', line 577

def self.showoff_markdown(dir = ".")
  get_config_option(dir, "markdown", "redcarpet")
end

.showoff_pdf_options(dir = '.') ⇒ Object 



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# File 'lib/showoff_utils.rb', line 572

def self.showoff_pdf_options(dir = '.')
  opts = get_config_option(dir, 'pdf_options', {:page_size => 'Letter', :orientation => 'Landscape', :print_media_type => true})
  Hash[opts.map {|k, v| [k.to_sym, v]}] # keys must be symbols
end

.showoff_renderer_options(dir = '.', default_options = MarkdownConfig::defaults(dir)) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 581

def self.showoff_renderer_options(dir = '.', default_options = MarkdownConfig::defaults(dir))
  opts = get_config_option(dir, showoff_markdown(dir), default_options)
  Hash[opts.map {|k, v| [k.to_sym, v]}] if opts    # keys must be symbols
end

.showoff_sections(dir, data = nil, logger = nil) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 427

def self.showoff_sections(dir, data = nil, logger = nil)
  unless logger
    logger = Logger.new(STDOUT)
    logger.level = Logger::WARN
  end

  begin
    unless data
      index = File.join(dir, ShowoffUtils.presentation_config_file)
      data  = JSON.parse(File.read(index)) rescue ["."] # default boring showoff.json
    end

    logger.debug data
    if data.is_a?(Hash)
      # dup so we don't overwrite the original data structure and make it impossible to re-localize
      sections = data['sections'].dup
    else
      sections = data.dup
    end

    if sections.is_a? Array
      sections = showoff_legacy_sections(dir, sections)
    elsif sections.is_a? Hash
      raise "Named sections are unsupported on Ruby versions less than 1.9." if RUBY_VERSION.start_with? '1.8'
      sections.each do |key, value|
        next if value.is_a? Array
        cwd  = File.expand_path(dir)
        path = File.dirname(value)
        data = JSON.parse(File.read(value))
        raise "The section file #{value} must contain an array of filenames." unless data.is_a? Array

        # get relative paths to each slide in the array
        sections[key] = data.map do |filename|
          File.expand_path("#{path}/#{filename}").sub(/^#{cwd}\//, '')
        end
      end
    else
      raise "The `sections` key must be an Array or Hash, not a #{sections.class}."
    end

  rescue => e
    logger.error "There was a problem with the presentation file #{index}"
    logger.error e.message
    logger.debug e.backtrace
    sections = {}
  end

  sections
end

.showoff_slide_files(dir, data = nil, logger = nil) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 550

def self.showoff_slide_files(dir, data = nil, logger = nil)
  data = showoff_sections(dir, data, logger)
  data.map { |key, value| value }.flatten
end

.showoff_title(dir = '.') ⇒ Object 



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# File 'lib/showoff_utils.rb', line 555

def self.showoff_title(dir = '.')
  get_config_option(dir, 'name', "Presentation")
end

.skeleton(config) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 69

def self.skeleton(config)
  if config
    unless File.expand_path(config) == File.expand_path(File.basename(config),'.')
      FileUtils.cp(config, '.')
    end
    ShowoffUtils.presentation_config_file = File.basename(config)
  end

  # Create asset directories
  FileUtils.mkdir_p('_files/share')
  FileUtils.mkdir_p('_images')

  self.showoff_slide_files('.').each do |filename|
    next if File.exist? filename

    puts "Creating: #{filename}"
    if filename.downcase.end_with? '.md'
      FileUtils.mkdir_p File.dirname(filename)

      File.open(filename, 'w+') do |f|
        if filename =~ /section/i
          # kind of looks like a section slide
          f.puts make_slide("#{filename.sub(/\.md$/, '')}", "center subsection")
        else
          f.puts make_slide("#{filename.sub(/\.md$/, '')}")
        end
      end
    else
      FileUtils.mkdir_p filename
    end
  end
end

.update(verbose = false) ⇒ Object

just update the repo in cwd



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# File 'lib/showoff_utils.rb', line 252

def self.update(verbose=false)
  puts "Updating presentation repository..." if verbose
  system('git', 'pull')
end

.validate(config) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 133

def self.validate(config)
  showoff    = Showoff.new!(:pres_file  => config)
  validators = showoff.settings.showoff_config['validators'] || {}
  files      = []
  errors     = []

  # get a list of actual filenames
  files = self.showoff_slide_files('.')
  files.each do |filename|
    unless File.exist? filename
      errors << "Missing path: #{filename}"
      next
    end

    if filename.downcase.end_with? '.md'
      print '.'
      showoff.get_code_from_slide(filename.sub('.md',''), 'all', false).each_with_index do |block, index|
        lang, code, classes = block
        validator = validators[lang]

        if classes.include? 'no-validate'
          print '-'
          next

        elsif validator
          # write out a tempfile because many validators require files to work with
          Tempfile.open('showoff-validation') do |f|
            File.write(f.path, code)
            unless system("#{validator} #{f.path}", :out => File::NULL, :err => File::NULL)
              print 'F'
              errors << "Invalid #{lang} code on #{filename} [#{index}]"
            end
          end
        end

     end
    end
  end

  puts
  puts "Found #{errors.size} errors."
  unless errors.empty?
    errors.each { |err| puts " * #{err}" }
    exit!
  end
end

.write_file(filename, slide) ⇒ Object 



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# File 'lib/showoff_utils.rb', line 351

def self.write_file(filename,slide)
  File.open(filename,'w') do |file|
    file.puts slide
  end
  puts "Wrote #{filename}"
end