Class: Configuration

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

Overview

Indexing

Author: Stefan Rusterholz Contact: [email protected]> Version: 1.0.0 Date: 2007-10-12

About

Map configuration keys/data to files

Synopsis

config = Configuration.new("my/config")
config["some/key"] = "Some value"
config["some/key"] = config["some/key"].upcase # can't use upcase!

Defined Under Namespace

Modules: VERSION Classes: ConfFile, InvalidKey

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(base, dir_tree = []) ⇒ Configuration

Returns a new instance of Configuration.



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# File 'lib/configuration.rb', line 53

def initialize(base, dir_tree=[])
	# make it resistant against Dir.chdir
	@base  = File.expand_path(base).freeze
	@files = {}

	unless File.directory?(@base) && File.exist?("#@base/.configdir.yaml") then
		if File.file?(@base) then
			raise "Can't create directory #@base because of existing file #@base"
		end
		if File.exist?(@base) then
			raise "Directory #@base already exists and is not a configuration directory"
		end
	end
	unless File.exist?(@base) then
		FileUtils.mkdir_p(@base)
		File.open("#@base/.configdir.yaml", "w") { |fh|
			fh.write({
				:created  => Time.now,
				:modified => Time.now,
				:revision => 1,
			}.to_yaml)
		}
	end
	setup(dir_tree)
end

Instance Attribute Details

#base ⇒ Object (readonly)

Returns the value of attribute base.



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# File 'lib/configuration.rb', line 51

def base
  @base
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/configuration.rb', line 79

def [](key)
	file, key = split(key)
	return nil unless key_exist?(file, key)
	key ? @files[file][key] : @files[file]
end

#[]=(key, value) ⇒ Object 



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# File 'lib/configuration.rb', line 85

def []=(key, value)
	file, key = split(key)
	load(file)
	if key then
		if Hash === @files[file] then
			@files[file][key] = value
		else
			@files[file] = {key => value}
		end
	else
		@files[file] = value
	end
	store(file)
	value
end

#delete(key) ⇒ Object 



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# File 'lib/configuration.rb', line 107

def delete(key)
	file, key = split(key)
	return nil unless key_exist?(file, key) and File.exist?(file)
	if key.empty? then
		File.delete(file)
	else
		load(file)
		@files[file].delete(key)
		store(file)
	end
end

#exist?(key) ⇒ Boolean Also known as: has_key?

Returns:

  • (Boolean) 


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# File 'lib/configuration.rb', line 101

def exist?(key)
	file, key = split(key)
	key_exist?(file, key)
end

#setup(dirs) ⇒ Object 



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# File 'lib/configuration.rb', line 119

def setup(dirs)
	FileUtils.mkdir_p(dirs.map { |dir| "#@base/#{dir}" })
end