require 'active_support/core_ext/string/multibyte'
class String
# Returns the string, first removing all whitespace on both ends of
# the string, and then changing remaining consecutive whitespace
# groups into one space each.
#
# Examples:
# %{ Multi-line
# string }.squish # => "Multi-line string"
# " foo bar \n \t boo".squish # => "foo bar boo"
def squish
dup.squish!
end
# Performs a destructive squish. See String#squish.
def squish!
strip!
gsub!(/\s+/, ' ')
self
end
# Truncates a given +text+ after a given length if +text+ is longer than length.
# The last characters will be replaced with the :omission (defaults to "...")
# for a total length not exceeding :length.
#
# Pass a :separator to truncate +text+ at a natural break.
#
# ==== Examples
#
# "Once upon a time in a world far far away".truncate(30)
# # => Once upon a time in a worl...
#
# "Once upon a time in a world far far away".truncate(30, :separator => ' ')
# # => Once upon a time in a world...
#
# "Once upon a time in a world far far away".truncate(14)
# # => Once upon a...
#
# "And they found that many people were sleeping better.".truncate(25, :omission => "... (continued)")
# # => And they f... (continued)
def truncate(length, options = {})
text = self.dup
options[:omission] ||= "..."
length_with_room_for_omission = length - options[:omission].mb_chars.length
chars = text.mb_chars
stop = options[:separator] ?
(chars.rindex(options[:separator].mb_chars, length_with_room_for_omission) || length_with_room_for_omission) : length_with_room_for_omission
(chars.length > length ? chars[0...stop] + options[:omission] : text).to_s
end
end