Class: Amazon::Config

Inherits:
Hash
  • Object
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Defined in:
lib/amazon.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/amazon.rb', line 73

def initialize(config_str=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]
    #
    home = ENV['AMAZONRCDIR'] ||
    ENV['HOME'] || ENV['HOMEDRIVE'] + ENV['HOMEPATH'] ||
    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 )
        
        # 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
        
        self[key] = val
        
      end
    end
    
  end
  
end