Class: S3TarBackup::IniParser

Inherits:
Object
  • Object
show all
Defined in:
lib/s3_tar_backup/ini_parser.rb

Instance Method Summary collapse

Constructor Details

#initialize(file_path, defaults = {}) ⇒ IniParser

Returns a new instance of IniParser.



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# File 'lib/s3_tar_backup/ini_parser.rb', line 8

def initialize(file_path, defaults={})
  @file_path, @defaults = file_path, defaults
end

Instance Method Details

#[](arg) ⇒ Object 



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# File 'lib/s3_tar_backup/ini_parser.rb', line 112

def [](arg)
  get(arg)
end

#[]=(arg, value) ⇒ Object 



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# File 'lib/s3_tar_backup/ini_parser.rb', line 160

def []=(arg, value)
  set(arg, value)
end

#apply_defaults(defaults) ⇒ Object

Applies the defaults passed to the constructor



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# File 'lib/s3_tar_backup/ini_parser.rb', line 72

def apply_defaults(defaults)
  defaults.each do |key, default|
    section, key = key.match(/(.*)\.(.*)/)[1..2]

    if default.is_a?(Array)
      default_val, comment = default
    else
      default_val, comment = default, nil
    end

    @config[section] = {} unless @config.has_key?(section)
    set("#{section}.#{key}", default_val, comment)
  end
end

#each ⇒ Object 



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# File 'lib/s3_tar_backup/ini_parser.rb', line 198

def each
  @config.each_with_index do |section_key, section|
    section.each_with_index do |key, value|
      key_str = "#{section_key}#{key}"
      yield key_str, get(key_str)
    end
  end
end

#find_sections(pattern = /.*/) ⇒ Object 



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# File 'lib/s3_tar_backup/ini_parser.rb', line 194

def find_sections(pattern=/.*/)
  @config.select{ |k,v| k =~ pattern }
end

#get(arg, default = nil) ⇒ Object

Used to retrieve a config value, with an optional default. arg: The config key to get, in the form <section>.<key> default: The value to return if the key doesn’t exist. This function will use type information from self.defaults / default, if available. Example: config_object.get(‘section.key’, ‘default_value’)



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# File 'lib/s3_tar_backup/ini_parser.rb', line 121

def get(arg, default=nil)
  section, key = arg.match(/(.*)\.(.*)/)[1..2]
  section = section.to_sym
  key = key.to_sym

  unless @config.has_key?(section) && @config[section].has_key?(key)
    raise "Tried to access config key #{section}.#{key} which doesn't exist" if default.nil?
    return default
  end

  val = @config[section][key]
  # Is it one of the reserved keywords...?
  case val
  when 'True' then return true
  when 'False' then return false
  when 'None' then return nil
  end

  # Attempt to case... Is there a default?
  if default
    type = default.class
  elsif @defaults.has_key?("#{section}.#{key}")
    type = @defaults["#{section}.#{key}"].class
    # If default is of the form (value, comment)
    type = @defaults["#{section}.#{key}"][0].class if type.is_a?(Array)
  else
    type = nil
  end

  case type
  when Fixnum
    return val.to_i
  when Float
    return val.to_f
  else
    return val
  end
end

#has_section?(section) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/s3_tar_backup/ini_parser.rb', line 190

def has_section?(section)
  @config.has_key?(section.to_sym)
end

#load ⇒ Object

Loads the config from file, and parses it



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# File 'lib/s3_tar_backup/ini_parser.rb', line 13

def load
  if File.exists?(@file_path) && !File.directory?(@file_path)
    File.open(@file_path) do |f|
      @config, @comments = parse_config(f.readlines)
    end
  else
    @config, @comments = {}, {}
  end
  apply_defaults(@defaults)
  self # Allow chaining
end

#parse_config(config_lines) ⇒ Object

Parses a set of lines in a config file, turning them into sections and comments



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# File 'lib/s3_tar_backup/ini_parser.rb', line 33

def parse_config(config_lines)
  # TODO get rid of all the {:before => [], :after => nil}
  config, comments = {}, {}
  section = nil
  next_comment = {:before => [], :after => nil}

  config_lines.each do |line|
    case line.chomp
    # Section
    when /^\[([\w\-]+)(?: "([\w\-]+)")?\]$/
      section = $1.chomp
      section << ".#{$2.chomp}" if $2
      section = section.to_sym
      config[section] = {} unless config.has_key?(section)
      comments[section] = {} unless comments.has_key?(section)
      next_comment = {:before => [], :after => nil}
      # key line
    when /^([\w\-]+)\s*=\s*([^;]*?)\s*(?:;\s+(.*))?$/
      raise "Config key before section" unless section
      key = $1.chomp.to_sym
      if config[section].has_key?(key)
        config[section][key] = [config[section][key]] unless config[section][key].is_a?(Array)
        config[section][key] << $2.chomp
      else
        config[section][key] = $2.chomp
      end
      # If we found a comment at the end of the line
      next_comment[:after] = $3 if $3
      comments[section][key] = next_comment unless next_comment == {:before => [], :after => nil}
      next_comment = {:before => [], :after => nil}
    when /;\s?(.*)/
      next_comment[:before] << $1
    end
  end

  [config, comments]
end

#render_config(comments = true) ⇒ Object

Takes the current config, and renders it



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# File 'lib/s3_tar_backup/ini_parser.rb', line 88

def render_config(comments=true)
  r = ''
  @config.each do |section_key, section|
    section_key_parts = section_key.to_s.split('.')
    if section_key_parts.count > 1
      r << "\n[#{section_key_parts.shift} \"#{section_key_parts.join(' ')}\"]\n\n"
    else
      r << "\n[#{section_key}]\n\n"
    end
    section.each do |key, values|
      values = [*values]
      comments_before, comments_after = '', ''
      if comments && @comments.include?(section_key) && @comments[section_key].include?(key)
        comments_before = @comments[section_key][key][:before].inject(''){ |s,v| s << "; #{v}\n" }
        comments_after = " ; #{@comments[section_key][key][:after]}" if @comments[section_key][key][:after]
      end
      r << comments_before
      r << values.map{ |value| "#{key} = #{value}" }.join("\n")
      r << comments_after << "\n\n"
    end
  end
  r.lstrip.rstrip
end

#save ⇒ Object

Saves the config to file



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# File 'lib/s3_tar_backup/ini_parser.rb', line 26

def save
  File.open(@file_path, 'w') do |f|
    f.write(render_config)
  end
end

#set(arg, value, comments = nil) ⇒ Object

Used to set a config value, with optional comments. arg; The config key to set, in the form <section>.<key> comments: The comments to set, if any. If multiple lines are desired, they should be separated by “n” Example: config_object.set(‘section.key’, ‘value’, ‘This is the commentnExplaining section.key’)



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# File 'lib/s3_tar_backup/ini_parser.rb', line 168

def set(arg, value, comments=nil)
  section, key = arg.match(/(.*)\.(.*)/)[1..2]
  section = section.to_sym
  key = key.to_sym

  # Is it one of our special values?
  case value
  when true then value = 'True'
  when false then value = 'False'
  when nil then value = 'None'
  end

  @config[section] = {} unless @config.has_key?(section)
  @config[section][key] = value

  if comments
    comments = comments.split("\n")
    @comments[section] = {} unless @comments.has_key?(section)
    @comments[section][key] = {:before => comments, :after => nil}
  end
end