Module: Jekyll::Utils

Extended by:
Utils
Included in:
Utils
Defined in:
lib/jekyll/utils.rb,
lib/jekyll/utils/ansi.rb,
lib/jekyll/utils/platforms.rb

Defined Under Namespace

Modules: Ansi, Platforms

Constant Summary collapse

SLUGIFY_MODES =

Constants for use in #slugify

%w(raw default pretty)
SLUGIFY_RAW_REGEXP = 
Regexp.new('\\s+').freeze
SLUGIFY_DEFAULT_REGEXP = 
Regexp.new('[^[:alnum:]]+').freeze
SLUGIFY_PRETTY_REGEXP = 
Regexp.new("[^[:alnum:]._~!$&'()+,;=@]+").freeze

Instance Method Summary collapse

Instance Method Details

Add an appropriate suffix to template so that it matches the specified permalink style.

template - permalink template without trailing slash or file extension permalink_style - permalink style, either built-in or custom

The returned permalink template will use the same ending style as specified in permalink_style. For example, if permalink_style contains a trailing slash (or is :pretty, which indirectly has a trailing slash), then so will the returned template. If permalink_style has a trailing “:output_ext” (or is :none, :date, or :ordinal) then so will the returned template. Otherwise, template will be returned without modification.

Examples:

add_permalink_suffix("/:basename", :pretty)
# => "/:basename/"

add_permalink_suffix("/:basename", :date)
# => "/:basename:output_ext"

add_permalink_suffix("/:basename", "/:year/:month/:title/")
# => "/:basename/"

add_permalink_suffix("/:basename", "/:year/:month/:title")
# => "/:basename"

Returns the updated permalink template



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# File 'lib/jekyll/utils.rb', line 231

def add_permalink_suffix(template, permalink_style)
  case permalink_style
  when :pretty
    template << "/"
  when :date, :ordinal, :none
    template << ":output_ext"
  else
    template << "/" if permalink_style.to_s.end_with?("/")
    template << ":output_ext" if permalink_style.to_s.end_with?(":output_ext")
  end
  template
end

#deep_merge_hashes(master_hash, other_hash) ⇒ Object

Non-destructive version of deep_merge_hashes! See that method.

Returns the merged hashes.



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# File 'lib/jekyll/utils.rb', line 30

def deep_merge_hashes(master_hash, other_hash)
  deep_merge_hashes!(master_hash.dup, other_hash)
end

#deep_merge_hashes!(target, overwrite) ⇒ Object

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.



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# File 'lib/jekyll/utils.rb', line 43

def deep_merge_hashes!(target, overwrite)
  target.merge!(overwrite) do |key, old_val, new_val|
    if new_val.nil?
      old_val
    else
      mergable?(old_val) && mergable?(new_val) ? deep_merge_hashes(old_val, new_val) : new_val
    end
  end

  if target.respond_to?(:default_proc) && overwrite.respond_to?(:default_proc) && target.default_proc.nil?
    target.default_proc = overwrite.default_proc
  end

  target
end

#has_yaml_header?(file) ⇒ Boolean

Determines whether a given file has

Returns true if the YAML front matter is present.

Returns:

  • (Boolean) 


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# File 'lib/jekyll/utils.rb', line 135

def has_yaml_header?(file)
  !!(File.open(file, 'rb') { |f| f.readline } =~ /\A---\s*\r?\n/)
rescue EOFError
  false
end

#mergable?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/jekyll/utils.rb', line 59

def mergable?(value)
  value.is_a?(Hash) || value.is_a?(Drops::Drop)
end

#parse_date(input, msg = "Input could not be parsed.") ⇒ Object

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



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# File 'lib/jekyll/utils.rb', line 126

def parse_date(input, msg = "Input could not be parsed.")
  Time.parse(input).localtime
rescue ArgumentError
  raise Errors::FatalException.new("Invalid date '#{input}': " + msg)
end

#pluralized_array_from_hash(hash, singular_key, plural_key) ⇒ Object

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



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# File 'lib/jekyll/utils.rb', line 71

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

#safe_glob(dir, patterns, flags = 0) ⇒ Object

Work the same way as Dir.glob but seperating the input into two parts (‘dir’ + ‘/’ + ‘pattern’) to make sure the first part(‘dir’) does not act as a pattern.

For example, Dir.glob(“path[/*”) always returns an empty array, because the method fails to find the closing pattern to ‘[’ which is ‘]’

Examples:

safe_glob("path[", "*")
# => ["path[/file1", "path[/file2"]

safe_glob("path", "*", File::FNM_DOTMATCH)
# => ["path/.", "path/..", "path/file1"]

safe_glob("path", ["**", "*"])
# => ["path[/file1", "path[/folder/file2"]

dir - the dir where glob will be executed under

(the dir will be included to each result)

patterns - the patterns (or the pattern) which will be applied under the dir flags - the flags which will be applied to the pattern

Returns matched pathes



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# File 'lib/jekyll/utils.rb', line 267

def safe_glob(dir, patterns, flags = 0)
  return [] unless Dir.exist?(dir)
  pattern = File.join(Array patterns)
  return [dir] if pattern.empty?
  Dir.chdir(dir) do
    Dir.glob(pattern, flags).map { |f| File.join(dir, f) }
  end
end

#slugify(string, mode: nil, cased: false) ⇒ Object

Slugify a filename or title.

string - the filename or title to slugify mode - how string is slugified cased - whether to replace all uppercase letters with their lowercase counterparts

When mode is “none”, return the given string.

When mode is “raw”, return the given string, with every sequence of spaces characters replaced with a hyphen.

When mode is “default” or nil, non-alphabetic characters are replaced with a hyphen too.

When mode is “pretty”, some non-alphabetic characters (._~!$&‘()+,;=@) are not replaced with hyphen.

If cased is true, all uppercase letters in the result string are replaced with their lowercase counterparts.

Examples:

slugify("The _config.yml file")
# => "the-config-yml-file"

slugify("The _config.yml file", "pretty")
# => "the-_config.yml-file"

slugify("The _config.yml file", "pretty", true)
# => "The-_config.yml file"

Returns the slugified string.



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# File 'lib/jekyll/utils.rb', line 173

def slugify(string, mode: nil, cased: false)
  mode ||= 'default'
  return nil if string.nil?

  unless SLUGIFY_MODES.include?(mode)
    return cased ? string : string.downcase
  end

  # Replace each character sequence with a hyphen
  re =
    case mode
    when 'raw'
      SLUGIFY_RAW_REGEXP
    when 'default'
      SLUGIFY_DEFAULT_REGEXP
    when 'pretty'
      # "._~!$&'()+,;=@" is human readable (not URI-escaped) in URL
      # and is allowed in both extN and NTFS.
      SLUGIFY_PRETTY_REGEXP
    end

  # Strip according to the mode
  slug = string.gsub(re, '-')

  # Remove leading/trailing hyphen
  slug.gsub!(/^\-|\-$/i, '')

  slug.downcase! unless cased
  slug
end

#stringify_hash_keys(hash) ⇒ Object

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



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# File 'lib/jekyll/utils.rb', line 115

def stringify_hash_keys(hash)
  transform_keys(hash) { |key| key.to_s rescue key }
end

#strip_heredoc(str) ⇒ Object

Takes an indented string and removes the preceding spaces on each line



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# File 'lib/jekyll/utils.rb', line 15

def strip_heredoc(str)
  str.gsub(/^[ \t]{#{(str.scan(/^[ \t]*(?=\S)/).min || "").size}}/, "")
end

#symbolize_hash_keys(hash) ⇒ Object

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



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# File 'lib/jekyll/utils.rb', line 106

def symbolize_hash_keys(hash)
  transform_keys(hash) { |key| key.to_sym rescue key }
end

#titleize_slug(slug) ⇒ Object

Takes a slug and turns it into a simple title.



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# File 'lib/jekyll/utils.rb', line 21

def titleize_slug(slug)
  slug.split("-").map! do |val|
    val.capitalize!
  end.join(" ")
end

#transform_keys(hash) ⇒ Object 



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# File 'lib/jekyll/utils.rb', line 93

def transform_keys(hash)
  result = {}
  hash.each_key do |key|
    result[yield(key)] = hash[key]
  end
  result
end

#value_from_plural_key(hash, key) ⇒ Object 



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# File 'lib/jekyll/utils.rb', line 81

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) ⇒ Object 



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# File 'lib/jekyll/utils.rb', line 77

def value_from_singular_key(hash, key)
  hash[key] if hash.key?(key) || (hash.default_proc && hash[key])
end