Class: Amazon::Config

Inherits:
Hash
  • Object
show all
Defined in:
lib/ruby-paa.rb

Overview

A Class for dealing with configuration files, such as /etc/amazonrc and ~/.amazonrc.

Defined Under Namespace

Classes: ConfigError

Instance Method Summary collapse

Constructor Details

#initialize(config_str = nil) ⇒ Config

A configuration may be passed in as a string. Otherwise, the files /etc/amazonrc and ~/.amazonrc are read if they exist and are readable.



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# File 'lib/ruby-paa.rb', line 74

def initialize(config_str=nil)
  locale = nil

  if config_str

    # We have been passed a config file as a string.
    #
    config_files = [ config_str ]
    config_class = StringIO

  else

    # Perform the usual search for the system and user config files.
    #
    config_files = [ File.join( '', 'etc', 'amazonrc' ) ]

    # Figure out where home is. The locations after HOME are for Windows.
    # [ruby-core:12347]
    #
    hp = nil
    if ENV.key?( 'HOMEDRIVE' ) && ENV.key?( 'HOMEPATH' )
      hp = ENV['HOMEDRIVE'] + ENV['HOMEPATH']
    end
    home = ENV['AMAZONRCDIR'] || ENV['HOME'] || hp || ENV['USERPROFILE']

    user_rcfile = ENV['AMAZONRCFILE'] || '.amazonrc'

    if home
      config_files << File.expand_path( File.join( home, user_rcfile ) )
    end

    config_class = File
  end

  config_files.each do |cf|

    if config_class == StringIO
      readable = true
    else
      # We must determine whether the file is readable.
      #
      readable = File.exists?( cf ) && File.readable?( cf )
    end

    if readable

      Amazon.dprintf( 'Opening %s ...', cf ) if config_class == File

      config_class.open( cf ) { |f| lines = f.readlines }.each do |line|
        line.chomp!

        # Skip comments and blank lines.
        #
        next if line =~ /^(#|$)/

        Amazon.dprintf( 'Read: %s', line )

        # Determine whether we're entering the subsection of a new locale.
        #
        if match = line.match( /^\[(\w+)\]$/ )
          locale = match[1]
          Amazon.dprintf( "Config locale is now '%s'.", locale )
          next
        end

        # Store these, because we'll probably find a use for these later.
        #
        begin
          match = line.match( /^\s*(\S+)\s*=\s*(['"]?)([^'"]+)(['"]?)/ )
          key, begin_quote, val, end_quote = match[1, 4]
          raise ConfigError if begin_quote != end_quote

        rescue NoMethodError, ConfigError
          raise ConfigError, "bad config line: #{line}"
        end

        if locale && locale != 'global'
          self[locale] ||= {}
          self[locale][key] = val
        else
          self[key] = val
        end

      end
    end

  end

end