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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 <tt>length</tt> if +text+ is longer than <tt>length</tt>:
#
# "Once upon a time in a world far far away".truncate(27)
# # => "Once upon a time in a wo..."
#
# Pass a <tt>:separator</tt> to truncate +text+ at a natural break:
#
# "Once upon a time in a world far far away".truncate(27, :separator => ' ')
# # => "Once upon a time in a..."
#
# The last characters will be replaced with the <tt>:omission</tt> string (defaults to "...")
# for a total length not exceeding <tt>:length</tt>:
#
# "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
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