module Jekyll::Utils

Public Instance Methods

deep_merge_hashes(master_hash, other_hash) click to toggle source

Merges a master hash with another hash, recursively.

master_hash - the “parent” hash whose values will be overridden other_hash - the other hash whose values will be persisted after the merge

This code was lovingly stolen from some random gem: gemjack.com/gems/tartan-0.1.1/classes/Hash.html

Thanks to whoever made it.

# File lib/jekyll/utils.rb, line 14
def deep_merge_hashes(master_hash, other_hash)
  target = master_hash.dup

  other_hash.each_key do |key|
    if other_hash[key].is_a? Hash and target[key].is_a? Hash
      target[key] = Utils.deep_merge_hashes(target[key], other_hash[key])
      next
    end

    target[key] = other_hash[key]
  end

  target
end
has_yaml_header?(file) click to toggle source

Determines whether a given file has

Returns true if the YAML front matter is present.

# File lib/jekyll/utils.rb, line 101
def has_yaml_header?(file)
  !!(File.open(file, 'rb') { |f| f.read(5) } =~ /\A---\r?\n/)
end
parse_date(input, msg = "Input could not be parsed.") click to toggle source

Parse a date/time and throw an error if invalid

input - the date/time to parse msg - (optional) the error message to show the user

Returns the parsed date if successful, throws a FatalException if not

# File lib/jekyll/utils.rb, line 92
def parse_date(input, msg = "Input could not be parsed.")
  Time.parse(input)
rescue ArgumentError
  raise Errors::FatalException.new("Invalid date '#{input}': " + msg)
end
pluralized_array_from_hash(hash, singular_key, plural_key) click to toggle source

Read array from the supplied hash favouring the singular key and then the plural key, and handling any nil entries.

hash - the hash to read from singular_key - the singular key plural_key - the plural key

Returns an array

# File lib/jekyll/utils.rb, line 37
def pluralized_array_from_hash(hash, singular_key, plural_key)
  [].tap do |array|
    array << (value_from_singular_key(hash, singular_key) || value_from_plural_key(hash, plural_key))
  end.flatten.compact
end
slugify(string) click to toggle source

Slugify a filename or title.

name - the filename or title to slugify

Returns the given filename or title in lowercase, with every sequence of spaces and non-alphanumeric characters replaced with a hyphen.

# File lib/jekyll/utils.rb, line 112
def slugify(string)
  unless string.nil?
    string            # Replace each non-alphanumeric character sequence with a hyphen
      .gsub(/[^a-z0-9]+/i, '-')            # Remove leading/trailing hyphen
      .gsub(/^\-|\-$/i, '')            # Downcase it
      .downcase
  end
end
stringify_hash_keys(hash) click to toggle source

Apply to_s to all keys in the Hash

hash - the hash to which to apply this transformation

Returns a new hash with stringified keys

# File lib/jekyll/utils.rb, line 81
def stringify_hash_keys(hash)
  transform_keys(hash) { |key| key.to_s rescue key }
end
symbolize_hash_keys(hash) click to toggle source

Apply to_sym to all keys in the hash

hash - the hash to which to apply this transformation

Returns a new hash with symbolized keys

# File lib/jekyll/utils.rb, line 72
def symbolize_hash_keys(hash)
  transform_keys(hash) { |key| key.to_sym rescue key }
end
transform_keys(hash) { |key| ... } click to toggle source
# File lib/jekyll/utils.rb, line 59
def transform_keys(hash)
  result = {}
  hash.each_key do |key|
    result[yield(key)] = hash[key]
  end
  result
end
value_from_plural_key(hash, key) click to toggle source
# File lib/jekyll/utils.rb, line 47
def value_from_plural_key(hash, key)
  if hash.key?(key) || (hash.default_proc && hash[key])
    val = hash[key]
    case val
    when String
      val.split
    when Array
      val.compact
    end
  end
end
value_from_singular_key(hash, key) click to toggle source
# File lib/jekyll/utils.rb, line 43
def value_from_singular_key(hash, key)
  hash[key] if (hash.key?(key) || (hash.default_proc && hash[key]))
end