Class: Ruber::ProjectBackend

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

Overview

Backend for SettingsContainer used by the project class. It is similar to YamlSettingsBackend, except for the fact that it produces three files instead of one: one only contains options of type :global (and is referred to as the project file), another one contains only options of type :user and the last contains only options of type :session

Constant Summary collapse

EXTENSIONS =

Associates each option type (:global, :user and :session) with the extension of the file where those options will be stored

{:global => '.ruprj', :user => '.ruusr', :session => '.ruses'}

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ ProjectBackend

Creates a new ProjectBackend. file is the name of the project file. The name of the file for the user options and the session options is obtained by appending the appropriate extension to the project file:

  • .ruusr for the user options file

  • .ruses for the session options file

If file has the .ruprj extension, that extension will be removed before adding the extensions above. If it has any other extension (or no extension at all), they’ll be kept.

For example, if file is /home/stefano/xyz.ruprj, the other two files will be /home/stefano/xyz.ruusr and /home/stefano/xyz.ruses. Instead, if file is /home/stefano/xyz.abc, the other two files will be /home/stefano/xyz.abc.ruusr and /home/stefano/xyz.abc.ruses

If either the file for the global or the user options already exists but doesn’t have the correct format, YamlSettingsBackend::InvalidSettingsFile will be raised. If the same happens for the session options file, instead, a warning will be emitted, default values will be used for the session options and they will never be saved to file.



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# File 'lib/ruber/project_backend.rb', line 61

def initialize file
  @backends = {}
  base_file = file.sub(/#{EXTENSIONS[:global]}$/, '')
  @backends[:global] = YamlSettingsBackend.new file
  @backends[:user] = YamlSettingsBackend.new base_file + EXTENSIONS[:user]
  @backends[:session] = begin YamlSettingsBackend.new base_file + EXTENSIONS[:session]
  rescue YamlSettingsBackend::InvalidSettingsFile
    warn "The file #{base_file + '.ruses'} already exists but it's not a valid session file. Session options won't be saved"
    YamlSettingsBackend.new ''
  end
end

Instance Method Details

#[](opt) ⇒ Object

Returns the value of the option described by the option object opt (see SettingsContainer#add_option).

The value will be retrieved from the backend corresponding to the type of the option



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# File 'lib/ruber/project_backend.rb', line 86

def [] opt
  @backends[opt.type][opt]
end

#file ⇒ Object

Returns the path of the file were the global options are stored



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# File 'lib/ruber/project_backend.rb', line 76

def file
  @backends[:global].file
end

#write(opts) ⇒ Object

Writes the options opts back to disk. The options contained in opts will be grouped according to their types and the appropriate backend will be used to save each group.



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# File 'lib/ruber/project_backend.rb', line 95

def write opts
  options = {:global => {}, :user => {}, :session => {}}
  opts.each{|k, v| options[k.type][k] = v}
  @backends[:global].write options[:global]
  @backends[:user].write options[:user]
  @backends[:session].write options[:session] unless @backends[:session].file.empty?
end