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authorAdam James <atj@pulsewidth.org.uk>2009-06-16 23:27:50 +0100
committerAdam James <atj@pulsewidth.org.uk>2009-06-29 23:23:33 +0100
commit561f183fb8c91867bade293c340a90a87a3b8c84 (patch)
tree93dc64d42837fe1aa78977c97d6c065ec8968d82 /lib/rbot
parentdd1b52cacce13c8c66d210215c3cfe38356e67cf (diff)
core/utils/extends.rb: add #conjoin for Array
Diffstat (limited to 'lib/rbot')
-rw-r--r--lib/rbot/core/utils/extends.rb39
1 files changed, 39 insertions, 0 deletions
diff --git a/lib/rbot/core/utils/extends.rb b/lib/rbot/core/utils/extends.rb
index 083f2b85..332a1629 100644
--- a/lib/rbot/core/utils/extends.rb
+++ b/lib/rbot/core/utils/extends.rb
@@ -125,6 +125,45 @@ class ::Array
end
end
+ # This method is an advanced version of #join
+ # allowing fine control of separators:
+ #
+ # [1,2,3].conjoin(', ', ' and ')
+ # => "1, 2 and 3
+ #
+ # [1,2,3,4].conjoin{ |i, a, b| i % 2 == 0 ? '.' : '-' }
+ # => "1.2-3.4"
+ #
+ # Code lifted from the ruby facets project:
+ # <http://facets.rubyforge.org>
+ # git-rev: c8b7395255b977d3c7de268ff563e3c5bc7f1441
+ # file: lib/core/facets/array/conjoin.rb
+ def conjoin(*args, &block)
+ return first.to_s if size < 2
+
+ sep = []
+
+ if block_given?
+ (size - 1).times do |i|
+ sep << yield(i, *slice(i, 2))
+ end
+ else
+ options = (Hash === args.last) ? args.pop : {}
+ separator = args.shift || ""
+ options[-1] = args.shift unless args.empty?
+
+ sep = [separator] * (size - 1)
+
+ if options.key?(:last)
+ options[-1] = options.delete(:last)
+ end
+ options[-1] ||= _(" and ")
+
+ options.each{ |i, s| sep[i] = s }
+ end
+
+ zip(sep).join
+ end
end
# Extensions to the Range class