Class: Rack::Svelte::Cogs

Inherits:
Object
  • Object
show all
Defined in:
lib/rack/svelte/cogs.rb

Overview

This class is the interface between Rack and the svelte-ruby gem

Constant Summary collapse

DEFAULT_SVELTE_OPTS =

defaults for the Svelte gem config

{}
DEFAULT_ROOT = 
'/'
DEFAULT_COMPONENTS_IN = 
'/app/components'
DEFAULT_COMPONENTS_OUT = 
'/public/app/js'
DEFAULT_DIR_OUT_OVERWRITE = 
false
DEFAULT_DIR_OUT_CLEAR = 
false

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}) ⇒ Cogs

Returns a new instance of Cogs.



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# File 'lib/rack/svelte/cogs.rb', line 26

def initialize(app, options = {})
  @app                      = app
  symbolize_keys!(options)
  self.app_root_dir         = options.delete(:app_root_dir)       || DEFAULT_ROOT
  self.components_dir_in    = options.delete(:components_dir_in)  || DEFAULT_COMPONENTS_IN
  self.components_dir_out   = options.delete(:components_dir_out) || DEFAULT_COMPONENTS_OUT
  self.dir_out_overwrite    = options.delete(:dir_out_overwrite)  || DEFAULT_DIR_OUT_OVERWRITE
  self.dir_out_clear        = options.delete(:dir_out_clear)      || DEFAULT_DIR_OUT_CLEAR
  self.svelte_options       = DEFAULT_SVELTE_OPTS.merge(options)
end

Instance Attribute Details

#app_root_dir ⇒ Object

options for Rack::Svelte processing



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# File 'lib/rack/svelte/cogs.rb', line 20

def app_root_dir
  @app_root_dir
end

#components_dir_in ⇒ Object

Returns the value of attribute components_dir_in.



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# File 'lib/rack/svelte/cogs.rb', line 21

def components_dir_in
  @components_dir_in
end

#components_dir_out ⇒ Object

Returns the value of attribute components_dir_out.



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# File 'lib/rack/svelte/cogs.rb', line 22

def components_dir_out
  @components_dir_out
end

#dir_out_clear ⇒ Object

Returns the value of attribute dir_out_clear.



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# File 'lib/rack/svelte/cogs.rb', line 24

def dir_out_clear
  @dir_out_clear
end

#dir_out_overwrite ⇒ Object

Returns the value of attribute dir_out_overwrite.



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# File 'lib/rack/svelte/cogs.rb', line 23

def dir_out_overwrite
  @dir_out_overwrite
end

#svelte_options ⇒ Object

svelte-ruby gem options, see github.com/sveltejs/svelte#options



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# File 'lib/rack/svelte/cogs.rb', line 17

def svelte_options
  @svelte_options
end

Instance Method Details

#call(env) ⇒ Object

method required by Rack interface



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# File 'lib/rack/svelte/cogs.rb', line 38

def call(env)
  call! env
end

#call!(env) ⇒ Object

thread safe version using shallow copy of env



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# File 'lib/rack/svelte/cogs.rb', line 43

def call!(env)
  dir_in  = File.join(self.app_root_dir, self.components_dir_in)
  dir_out = File.join(self.app_root_dir, self.components_dir_out)

  raise "ERROR: Dir In cannot be found: #{dir_in}" unless Dir.exist? dir_in
  raise "ERROR: Dir Out cannot be found: #{dir_out}" unless Dir.exist? dir_out

  FileUtils.rm File.join(dir_out, '*') if self.dir_out_clear

  Dir.glob(File.join(dir_in, '**/*')).each do |filename_in|
    # only html components
    next unless filename_in =~ /.\.html$/i

    # create output filename
    fn_in           = filename_in[dir_in.length..-1]  # remove input dir
    fn_out_basename = File.basename(fn_in).split('.')[0] + '.js'
    fn_out_dir      = File.dirname(fn_in)
    fn_out          = File.join(dir_out, fn_out_dir, fn_out_basename) # Kenny Powers

    # ensure output dir
    FileUtils.mkdir_p(fn_out_dir) unless Dir.exist?(fn_out_dir)

    # compile
    sv_hash = ::Svelte.exec_method('svelte.compile', filename_in, *self.svelte_options)

    unless self.dir_out_overwrite
      raise "Error: file exists: #{fn_out}\n  use option: 'dir_out_overwrite: true'" if File.exist?(fn_out)
    end

    # write
    IO.write(fn_out, sv_hash['code'])
  end

  ##
  # TODO: research thread safety (the following is adopted)
  @env = env.dup
  @app.call(@env)
end