module GetText

makes dynamic translation messages readable for the gettext parser. _(fruit) cannot be understood by the gettext parser. To help the parser find all your translations, you can add fruit = N_("Apple") which does not translate, but tells the parser: “Apple” needs translation.

• msgid: the message id.

• Returns: msgid.

# File lib/gettext.rb, line 245
def N_(msgid)
  msgid
end

This is same function as #N_ but for ngettext.

• msgid: the message id.

• msgid_plural: the plural message id.

• Returns: msgid.

# File lib/gettext.rb, line 253
def Nn_(msgid, msgid_plural)
  [msgid, msgid_plural]
end

bindtextdomain(domainname, options = {})

Bind a textdomain(%{path}/%{locale}/LC_MESSAGES/%{domainname}.mo) to your program. Normally, the texdomain scope becomes the class/module(and parent classes/included modules).

• domainname: the textdomain name.

• options: options as an Hash.

  • :path - the path to the mo-files. When the value is nil, it will search default paths such as /usr/share/locale, /usr/local/share/locale)

  • :output_charset - The output charset. Same with #set_output_charset. Usually, L10n library doesn't use this option. Application may use this once.

• Returns: the GetText::TextDomainManager.

# File lib/gettext.rb, line 64
def bindtextdomain(domainname, *options)
  bindtextdomain_to(self, domainname, *options)
end

Includes GetText module and bind a textdomain to a class.

• klass: the target ruby class.

• domainname: the textdomain name.

• options: options as an Hash. See #bindtextdomain.

# File lib/gettext.rb, line 72
def bindtextdomain_to(klass, domainname, *options)
  if options[0].kind_of? Hash
    opts = options[0]
  else
    # for backward compatibility.
    opts = {}
    opts[:path] = options[0] if options[0]
    opts[:output_charset] = options[2] if options[2]
  end
  unless (klass.kind_of? GetText or klass.include? GetText)
    klass.__send__(:include, GetText)
  end
  TextDomainManager.bind_to(klass, domainname, opts)
end

Gets the CGI object. If it is nil, returns new CGI object. This methods is appeared when requiring “gettext/cgi”.

• Returns: the CGI object

# File lib/gettext/cgi.rb, line 35
def cgi
  Locale.cgi
end

Same as #set_cgi. This methods is appeared when requiring “gettext/cgi”.

• cgi_: CGI object

• Returns: cgi_

# File lib/gettext/cgi.rb, line 28
def cgi=(cgi_)
  set_cgi(cgi_)
  cgi_
end

Creates mo-files using #{po_root}/#{lang}/*.po an put them to #{targetdir}/#{targetdir_rule}/.

This is a convenience function of GetText.rmsgfmt for multiple target files.

• options: options as a Hash.

  • verbose: true if verbose mode, otherwise false

  • po_root: the root directory of po-files.

  • mo_root: the target root directory where the mo-files are stored.

  • mo_path_rule: the target directory for each mo-files.

# File lib/gettext/tools.rb, line 101
def create_mofiles(options = {})
  options = {:po_root => "./po"}.merge(options)

  Dir.glob(File.join(options[:po_root], "*/*.po")) do |po_file|
    mo_file = mo_file_from_po_file(po_file,options)
    $stderr.print %Q[#{po_file} -> #{mo_file} ... ] if options[:verbose]
    FileUtils.mkdir_p(File.dirname(mo_file))
    Tools::MsgFmt.run(po_file, "-o", mo_file)
    $stderr.puts "Done." if options[:verbose]
  end
end

Translates msgid and return the message. This doesn't make a copy of the message.

You need to use String#dup if you want to modify the return value with destructive functions.

(e.g.1) _(“Hello ”).dup << “world”

But e.g.1 should be rewrite to:

(e.g.2) _(“Hello %{val}”) % {:val => “world”}

Because the translator may want to change the position of “world”.

• msgid: the message id.

• Returns: localized text by msgid. If there are not binded mo-file, it will return msgid.

# File lib/gettext.rb, line 128
def gettext(msgid)
  TextDomainManager.translate_singular_message(self, msgid)
end

Merges two Uniforum style .po files together.

Note This function requires “msgmerge” tool included in GNU GetText. So you need to install GNU GetText.

The def.po file is an existing PO file with translations which will be taken over to the newly created file as long as they still match; comments will be preserved, but extracted comments and file positions will be discarded.

The ref.pot file is the last created PO file with up-to-date source references but old translations, or a PO Template file (generally created by rxgettext); any translations or comments in the file will be discarded, however dot comments and file positions will be preserved. Where an exact match cannot be found, fuzzy matching is used to produce better results.

Usually you don't need to call this function directly. Use #update_pofiles instead.

• defpo: a po-file. translations referring to old sources

• refpo: a po-file. references to new sources

• app_version: the application information which appears “Project-Id-Version: #{app_version}” in the pot/po-files.

• Returns: self

# File lib/gettext/tools.rb, line 69
def msgmerge(defpo, refpo, app_version, options={})
  verbose = options.delete(:verbose)
  puts "msgmerge called" if verbose
  $stderr.print defpo + " "

  content = merge_po_files(defpo,refpo,options.delete(:msgmerge),verbose)

  if content.empty?
    # report failure
    failed_filename = refpo + "~"
    FileUtils.cp(refpo, failed_filename)
    $stderr.puts _("Failed to merge with %{defpo}") % {:defpo => defpo}
    $stderr.puts _("New .pot was copied to %{failed_filename}") %{:failed_filename => failed_filename}
    raise _("Check these po/pot-files. It may have syntax errors or something wrong.")
  else
    # update version and save merged data
    content.sub!(/(Project-Id-Version\:).*$/, "\\1 #{app_version}\\n\"")
    File.open(defpo, "w") {|f|f.write(content)}
  end

  self
end

The ngettext is similar to the gettext function as it finds the message catalogs in the same way. But it takes two extra arguments for plural form.

• msgid: the singular form.

• msgid_plural: the plural form.

• n: a number used to determine the plural form.

• Returns: the localized text which key is msgid_plural if n is plural(follow plural-rule) or msgid. “plural-rule” is defined in po-file.

# File lib/gettext.rb, line 180
def ngettext(msgid, msgid_plural, n = nil)
  TextDomainManager.translate_plural_message(self, msgid, msgid_plural, n)
end

The npgettext is similar to the nsgettext function.

e.g.) np_("Special", "An apple", "%{num} Apples", num) == ns_("Special|An apple", "%{num} Apples", num)

• msgctxt: the message context.

• msgid: the singular form.

• msgid_plural: the plural form.

• n: a number used to determine the plural form.

• Returns: the localized text which key is msgid_plural if n is plural(follow plural-rule) or msgid. “plural-rule” is defined in po-file.

# File lib/gettext.rb, line 217
def npgettext(msgctxt, msgids, arg2 = nil, arg3 = nil)
  if msgids.kind_of?(Array)
    msgid = msgids[0]
    msgid_ctxt = "#{msgctxt}\0004#{msgid}"
    msgid_plural = msgids[1]
    opt1 = arg2
    opt2 = arg3
  else
    msgid = msgids
    msgid_ctxt = "#{msgctxt}\0004#{msgid}"
    msgid_plural = arg2
    opt1 = arg3
    opt2 = nil
  end

  msgstr = TextDomainManager.translate_plural_message(self, msgid_ctxt, msgid_plural, opt1, opt2)
  if msgstr == msgid_ctxt
    msgid
  else
    msgstr
  end
end

The nsgettext is similar to the ngettext. But if there are no localized text, it returns a last part of msgid separeted “div”.

• msgid: the singular form with “div”. (e.g. “Special|An apple”)

• msgid_plural: the plural form. (e.g. “%{num} Apples”)

• n: a number used to determine the plural form.

• Returns: the localized text which key is msgid_plural if n is plural(follow plural-rule) or msgid. “plural-rule” is defined in po-file.

# File lib/gettext.rb, line 199
def nsgettext(msgid, msgid_plural, n="|", seperator = "|")
  TextDomainManager.translate_plural_message(self, msgid, msgid_plural, n, seperator)
end

Gets the current #output_charset which is set using #set_output_charset.

• Returns: output_charset.

# File lib/gettext.rb, line 268
def output_charset
  TextDomainManager.output_charset
end

Translates msgid with msgctxt. This methods is similer with s_().

e.g.) p_("File", "New")   == s_("File|New")
      p_("File", "Open")  == s_("File|Open")

• msgctxt: the message context.

• msgid: the message id.

• Returns: the localized text by msgid. If there are no localized text, it returns msgid.

See: www.gnu.org/software/autoconf/manual/gettext/Contexts.html

# File lib/gettext.rb, line 162
def pgettext(msgctxt, msgid)
  TextDomainManager.translate_singular_message(self, "#{msgctxt}\0004#{msgid}", "\0004")
end

Sets a CGI object. This methods is appeared when requiring “gettext/cgi”.

• cgi_: CGI object

• Returns: self

# File lib/gettext/cgi.rb, line 21
def set_cgi(cgi_)
  Locale.set_cgi(cgi_)
end

Set the locale to the current thread. Note that if set_locale is set, this value is ignored. If you need, #set_locale(nil); #set_current_locale(lang)

# File lib/gettext.rb, line 284
def set_current_locale(lang)
  Locale.current = lang
end

Set the locale. This value forces the locale whole the programs. This method calls Locale.set_app_language_tags, Locale.default, Locale.current. Use Locale methods if you need to handle locales more flexible.

# File lib/gettext.rb, line 275
def set_locale(lang)
  Locale.set_app_language_tags(lang)
  Locale.default = lang
  Locale.current = lang
end

Sets charset(String) such as “euc-jp”, “sjis”, “CP932”, “utf-8”, … You shouldn't use this in your own Libraries.

• charset: an #output_charset

• Returns: self

# File lib/gettext.rb, line 261
def set_output_charset(charset)
  TextDomainManager.output_charset = charset
  self
end

Translates msgid, but if there are no localized text, it returns a last part of msgid separeted “div”.

• msgid: the message id.

• separator: separator or nil for no seperation.

• Returns: the localized text by msgid. If there are no localized text, it returns a last part of the msgid separeted by “seperator”. Movie|Location -> Location

See: www.gnu.org/software/gettext/manual/html_mono/gettext.html#SEC151

# File lib/gettext.rb, line 145
def sgettext(msgid, seperator = "|")
  TextDomainManager.translate_singular_message(self, msgid, seperator)
end

At first, this creates the #{po_root}/#{domainname}.pot file using GetText::XGetText.run. In the second step, this updates(merges) the #{po_root}/#{domainname}.pot and all of the #{po_root}/#{lang}/#{domainname}.po files under “po_root” using “msgmerge”.

Note “msgmerge” tool is included in GNU GetText. So you need to install GNU GetText.

See <HOWTO maintain po/mo files(www.yotabanana.com/hiki/ruby-gettext-howto-manage.html)> for more detals.

• domainname: the textdomain name.

• targetfiles: An Array of target files, that should be parsed for messages (See GetText::XGetText.run for more details).

• app_version: the application information which appears “Project-Id-Version: #{app_version}” in the pot/po-files.

• options: a hash with following possible settings

  :lang    - update files only for one language - the language specified by this option
  :po_root - the root directory of po-files
  :msgmerge - an array with the options, passed through to the gnu msgmerge tool
              symbols are automatically translated to options with dashes,
              example: [:no_wrap, :no_fuzzy_matching, :sort_output] translated to '--no-fuzzy-matching --sort-output'
  :verbose - true to show verbose messages. default is false.

Example: #update_pofiles(“myapp”, Dir.glob(“lib/*.rb”), “myapp 1.0.0”, :verbose => true)

# File lib/gettext/tools.rb, line 135
def update_pofiles(textdomain, files, app_version, options = {})
  puts options.inspect if options[:verbose]

  #write found messages to tmp.pot
  temp_pot = "tmp.pot"
  Tools::XGetText.run("-o", temp_pot, *files)

  #merge tmp.pot and existing pot
  po_root = options.delete(:po_root) || "po"
  FileUtils.mkdir_p(po_root)
  msgmerge("#{po_root}/#{textdomain}.pot", temp_pot, app_version, options.dup)

  #update local po-files
  only_one_language = options.delete(:lang)
  if only_one_language
    msgmerge("#{po_root}/#{only_one_language}/#{textdomain}.po", temp_pot, app_version, options.dup)
  else
    Dir.glob("#{po_root}/*/#{textdomain}.po") do |po_file|
      msgmerge(po_file, temp_pot, app_version, options.dup)
    end
  end

  File.delete(temp_pot)
end

convert an array of String/Symbol to cli options

# File lib/gettext/tools.rb, line 178
def array_to_cli_options(array)
  [*array].map do |o|
    o.kind_of?(Symbol) ? "--#{o}".gsub('_','-') : o.to_s
  end.join(' ')
end

Merge 2 po files, using msgmerge

# File lib/gettext/tools.rb, line 163
def merge_po_files(po_a,po_b,msgmerge_options=[],verbose=false)
  return File.read(po_b) unless FileTest.exist? po_a

  cmd = ENV["MSGMERGE_PATH"] || "msgmerge"
  ensure_command_exists(cmd)

  remove_bom(po_a)

  cmd_params = array_to_cli_options(msgmerge_options)
  to_run = "#{cmd} #{cmd_params} #{po_a} #{po_b}"
  puts "\nrunning #{to_run}" if verbose
  %x#{to_run}`
end

where lies the mo file for a given po_file generare directory unless it exists

# File lib/gettext/tools.rb, line 193
def mo_file_from_po_file(po_file,options)
  options = {
    :mo_root => "./data/locale",
    :mo_path_rule => "%{lang}/LC_MESSAGES"
  }.merge(options)

  lang, textdomain = %r[/([^/]+?)/(.*)\.po].match(po_file[options[:po_root].size..-1]).to_a[1,2]

  mo_dir_rule = File.join(options[:mo_root], options[:mo_path_rule])
  mo_dir = mo_dir_rule % {:lang => lang}
  File.join(mo_dir, "#{textdomain}.mo")
end