Class: Webby::Apps::Generator

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/webby/apps/generator.rb

Overview

webby gen template site => creates the tmplate webby gen -h / –help webby gen => same as –help

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(output = $stdout, input = $stdin) ⇒ Generator

Initialize a new generator object.



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# File 'lib/webby/apps/generator.rb', line 27

def initialize( output = $stdout, input = $stdin )
  @options = {}
  @site = @template = nil
  @output, @input = output, input
  @journal = journal
end

Instance Attribute Details

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/webby/apps/generator.rb', line 23

def options
  @options
end

#site ⇒ Object

Returns the value of attribute site.



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# File 'lib/webby/apps/generator.rb', line 22

def site
  @site
end

#template ⇒ Object

Returns the value of attribute template.



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# File 'lib/webby/apps/generator.rb', line 22

def template
  @template
end

Class Method Details

.run(args) ⇒ Object

Create a new Generator instance and run the webby application given the command line args.



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# File 'lib/webby/apps/generator.rb', line 18

def self.run( args )
  self.new.run args
end

Instance Method Details

#abort(msg) ⇒ Object

Prints an abort message to the screen and then exits the Ruby interpreter. A non-zero return code is used to indicate an error.



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# File 'lib/webby/apps/generator.rb', line 219

def abort( msg )
  puts "\nAborting!"
  puts "    #{msg}"
  puts
  exit 1
end

#cp(file) ⇒ Object

Copy a file from the template location to the user specified site location. A message will be displayed to the screen indicating tha the file is being created.



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# File 'lib/webby/apps/generator.rb', line 189

def cp( file )
  src = template / file
  dst = site / file

  if test(?e, dst) 
    if identical?(src, dst)
      identical(dst)
      return
    end

    choice = case options[:collision]
      when :force then :force
      when :skip  then :skip
      else force_file_collision?( dst ) end

    case choice
      when :force then force(dst)
      when :skip  then skip(dst); return
      else raise "Invalid collision choice: #{choice.inspect}" end
  else
    create(dst)
  end
  return if pretend?

  FileUtils.cp(src, dst)
end

#create_site ⇒ Object

Create the site from the template specified by the user.



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# File 'lib/webby/apps/generator.rb', line 145

def create_site
  files = site_files

  # in update mode we only want to update the tasks directory
  if options[:update]
    FileUtils.mkdir_p site unless pretend?
    mkdir 'tasks'
    files['tasks'].sort.each {|file| cp file}
  else
    dirs = files.keys.concat %w[content layouts lib tasks templates]
    dirs.sort!
    dirs.uniq!

    # create the directories first
    dirs.each do |dir|
      next if dir =~ %r/^output\/.*$/
      mkdir dir
    end

    # and the create the files under each directory
    dirs.each do |dir|
      next if dir =~ %r/^output(\/.*)?$/
      files[dir].sort.each {|file| cp file}
    end
  end
end

#force_file_collision?(dst) ⇒ Boolean

Ask the user what to do about the file collision.

Returns:

  • (Boolean) 


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# File 'lib/webby/apps/generator.rb', line 260

def force_file_collision?( dst )
  dst = dst.sub(%r/#{site}\/?/, '')
  print "overwrite #{dst}? [(Y)es (n)o (q)uit] "
  case gets
    when %r/q/i  then abort 'user asked to quit'
    when %r/n/i  then :skip
    when %r/y/i  then :force
    when %r/\s*/ then :force
    else force_file_collision?(dst) end
rescue
  retry
end

#gets ⇒ Object

Reads a line text frim the input source.



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# File 'lib/webby/apps/generator.rb', line 53

def gets
  @input.gets
end

#identical?(src, dst) ⇒ Boolean

Returns true if the source file is identical to the destination file. Returns false if this is not the case.

Returns:

  • (Boolean) 


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# File 'lib/webby/apps/generator.rb', line 252

def identical?( src, dst )
  source      = IO.read(src)
  destination = IO.read(dst)
  source == destination
end

#mkdir(dir) ⇒ Object

Make a directory in the user specified site location. A message will be displayed to the screen indicating tha the directory is being created.



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# File 'lib/webby/apps/generator.rb', line 175

def mkdir( dir )
  dir = dir.empty? ? site : site / dir
  if test ?d, dir
    exists dir
  else
    create dir
    FileUtils.mkdir_p dir unless pretend?
  end
end

#parse(args) ⇒ Object

Parse out the command line options found in the args array.



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# File 'lib/webby/apps/generator.rb', line 67

def parse( args )
  opts = OptionParser.new
  opts.banner = 'Usage: webby-gen [options] template site'

  opts.separator ''
  opts.separator 'The webby-gen command is used to generate a site from a standard template.'
  opts.separator 'A new site can be created, or an existing site can be added to or updated.'

  opts.separator ''
  opts.on('-f', '--force',
          'overwrite files that already exist') {options[:collision] = :force}
  opts.on('-s', '--skip',
          'skip files that already exist') {options[:collision] = :skip}
  opts.on('-u', '--update',
          'update rake tasks for the site') {options[:update] = true}
  opts.on('-p', '--pretend',
          'run but do not make any changes') {options[:pretend] = true}

  opts.separator ''
  opts.on('-t', '--templates', 'list available templates') {
    ary = templates.map {|t| ::File.basename(t)}
    ary.delete 'webby'
    puts "\nAvailable Templates"
    puts "    #{ary.join(', ')}"
    puts
    exit
  }

  opts.separator ''
  opts.separator 'common options:'

  opts.on( '-h', '--help', 'show this message' ) {puts opts; exit}
  opts.on( '--version', 'show version' ) do
    puts "Webby #{::Webby::VERSION}"
    exit
  end

  # parse the command line arguments
  opts.parse! args
  tmpl, @site = args

  # if no site was given, see if there is a Sitefile in the current
  # directory
  if site.nil?
    self.site = '.' if test(?f, 'Sitefile')
  end

  # exit if comand line args are missing
  if site.nil? or tmpl.nil?
    puts opts
    exit 1
  end

  templates.each {|t| self.template = t if t =~ %r/\/#{tmpl}$/}
  if template.nil?
    puts opts
    abort "Could not find template '#{tmpl}'"
  end

  nil
end

#pretend? ⇒ Boolean

Returns true if we are only going to pretend to do something. All the output messages will be written, but no changes will be made on the disc.

Returns:

  • (Boolean) 


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# File 'lib/webby/apps/generator.rb', line 133

def pretend?
  options[:pretend] == true
end

#print(*args) ⇒ Object

Writes the given objects to the output destination.



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# File 'lib/webby/apps/generator.rb', line 47

def print( *args )
  @output.print(*args)
end

#puts(*args) ⇒ Object

Writes the given objects to the output destination. Each object is followed by a newline unless the object is a string with a newline already at the end.



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# File 'lib/webby/apps/generator.rb', line 41

def puts( *args )
  @output.puts(*args)
end

#run(args) ⇒ Object

Run the generator executing the commands specified by the user on the command line.



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# File 'lib/webby/apps/generator.rb', line 60

def run( args )
  parse args
  create_site
end

#site_files ⇒ Object

Iterates over all the files in the template directory and stores them in a hash.



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# File 'lib/webby/apps/generator.rb', line 229

def site_files
  exclude = %r/tmp$|bak$|~$|CVS|\.svn/o

  rgxp = %r/\A#{template}\/?/o
  paths = Hash.new {|h,k| h[k] = []}

  Find.find(template) do |p|
    next if exclude =~ p

    if test(?d, p)
      paths[p.sub(rgxp, '')]
      next
    end
    dir = ::File.dirname(p).sub(rgxp, '')
    paths[dir] << p.sub(rgxp, '')
  end

  paths
end

#templates ⇒ Object

Returns an array of available site templates.



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# File 'lib/webby/apps/generator.rb', line 139

def templates
  Dir.glob(::Webby.path('examples') / '*').sort
end