class Ini

Class with methods to read from and write into ini files.

A ini file is a text file in a specific format, it may include several fields which are sparated by field headlines which are enclosured by “[]”. Each field may include several key-value pairs.

Each key-value pair is represented by one line and the value is sparated from the key by a “=”.

Examples

Example ini file

# this is the first comment which will be saved in the comment attribute
mail=info@example.com
domain=example.com # this is a comment which will not be saved
[database]
db=example
user=john
passwd=very-secure
host=localhost
# this is another comment
[filepaths]
tmp=/tmp/example
lib=/home/john/projects/example/lib
htdocs=/home/john/projects/example/htdocs
[ texts ]
wellcome=Wellcome on my new website!
Website description = This is only a example. # and another comment

Example object

A Ini#comment stores:
"this is the first comment which will be saved in the comment attribute"

A Ini object stores:

{
 "mail" => "info@example.com",
 "domain" => "example.com",
 "database" => {
  "db" => "example",
  "user" => "john",
  "passwd" => "very-secure",
  "host" => "localhost"
 },
 "filepaths" => {
  "tmp" => "/tmp/example",
  "lib" => "/home/john/projects/example/lib",
  "htdocs" => "/home/john/projects/example/htdocs"
 }
 "texts" => {
  "wellcome" => "Wellcome on my new website!",
  "Website description" => "This is only a example."
 }
}

As you can see this module gets rid of all comments, linebreaks and unnecessary spaces at the beginning and the end of each field headline, key or value.

Using the object

Using the object is stright forward:

ini = Ini.new("path/settings.ini")
ini["mail"] = "info@example.com"
ini["filepaths"] = { "tmp" => "/tmp/example" }
ini.comment = "This is\na comment"
puts ini["filepaths"]["tmp"]
# => /tmp/example
ini.write()

Attributes

comment[RW]

:inihash is a hash which holds all ini data :comment is a string which holds the comments on the top of the file

inihash[RW]

:inihash is a hash which holds all ini data :comment is a string which holds the comments on the top of the file

Public Class Methods

new(path, load=nil) click to toggle source

Creating a new Ini object

path is a path to the ini file load if nil restores the data if possible

if true restores the data, if not possible raises an error
if false does not resotre the data
# File lib/more/facets/ini.rb, line 103
def initialize(path, load=nil)
  @path = path
  @inihash = {}
  
  if load or ( load.nil? and FileTest.readable_real? @path )
    restore()
  end
end
read_comment_from_file(path) click to toggle source

Reading comments from file

path is a path to the ini file

Returns a string with comments from the beginning of the ini file.

# File lib/more/facets/ini.rb, line 201
def Ini.read_comment_from_file(path)
  comment = ""
  
  IO.foreach(path) do |line|
    line.strip!
    break unless line[0,1] == "#" or line == ""
    
    comment << "#{line[1, line.length ].strip}\n"
  end
  
  comment
end
read_from_file(path) click to toggle source

Reading data from file

path is a path to the ini file

returns a hash which represents the data from the file

# File lib/more/facets/ini.rb, line 156
def Ini.read_from_file(path)
      
  inihash = {}
  headline = nil
  
  IO.foreach(path) do |line|

    line = line.strip.split(/#/)[0]
    
    # read it only if the line doesn't begin with a "=" and is long enough
    unless line.length < 2 and line[0,1] == "="
      
      # it's a headline if the line begins with a "[" and ends with a "]"
      if line[0,1] == "[" and line[line.length - 1, line.length] == "]"
        
        # get rid of the [] and unnecessary spaces
        headline = line[1, line.length - 2 ].strip
        inihash[headline] = {}
      else
      
        key, value = line.split(/=/, 2)
        
        key = key.strip unless key.nil?
        value = value.strip unless value.nil?
        
        unless headline.nil?
          inihash[headline][key] = value
        else
          inihash[key] = value unless key.nil?
        end
      end        
    end
  end
  
  inihash
end
to_s(inihash={}) click to toggle source

Turn a hash (up to 2 levels deepness) into a ini string

inihash is a hash representing the ini File. Default is a empty hash.

Returns a string in the ini file format.

# File lib/more/facets/ini.rb, line 246
def Ini.to_s(inihash={})
  str = ""
  
  inihash.each do |key, value|

    if value.is_a? Hash
      str << "[#{key.to_s}]\n"
      
      value.each do |under_key, under_value|
        str << "#{under_key.to_s}=#{under_value.to_s unless under_value.nil?}\n"
      end

    else
      str << "#{key.to_s}=#{value.to_s unless value2.nil?}\n"
    end
  end
  
  str
end
write_to_file(path, inihash={}, comment=nil) click to toggle source

Writing a ini hash into a file

path is a path to the ini file inihash is a hash representing the ini File. Default is a empty hash. comment is a string with comments which appear on the

top of the file. Each line will get a "#" before.
Default is no comment.
# File lib/more/facets/ini.rb, line 223
def Ini.write_to_file(path, inihash={}, comment=nil)
  raise TypeError, "String expected" unless comment.is_a? String or comment.nil?
  
  raise TypeError, "Hash expected" unless inihash.is_a? Hash
  File.open(path, "w") { |file|
    
    unless comment.nil?
      comment.each do |line|
        file << "# #{line}"
      end
    end
    
    file << Ini.to_s(inihash)
  }
end

Public Instance Methods

[](key) click to toggle source

Retrive the ini data for the key key

# File lib/more/facets/ini.rb, line 115
def [](key)
  @inihash[key]
end
[]=(key, value) click to toggle source

Set the ini data for the key key

# File lib/more/facets/ini.rb, line 122
def []=(key, value)
  raise TypeError, "String expected" unless key.is_a? String
  raise TypeError, "String or Hash expected" unless value.is_a? String or value.is_a? Hash
  
  @inihash[key] = value
end
restore() click to toggle source

Restores the data from file into the object

# File lib/more/facets/ini.rb, line 132
def restore()
  @inihash = Ini.read_from_file(@path)
  @comment = Ini.read_comment_from_file(@path)
end
to_h() click to toggle source
# File lib/more/facets/ini.rb, line 145
def to_h
  @inihash.dup
end
update() click to toggle source

Store data from the object in the file

# File lib/more/facets/ini.rb, line 140
def update()
  Ini.write_to_file(@path, @inihash, @comment)
end