* lib/pathname.rb (Pathname#sub_ext): new method. [ruby-list:44608]

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@15461 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 1 deletions

diff --git a/lib/pathname.rb b/lib/pathname.rb
index e4ca5489c..b2e119db1 100644
--- a/lib/pathname.rb
+++ b/lib/pathname.rb
@@ -255,11 +255,22 @@ class Pathname
   end
 
   if File::ALT_SEPARATOR
-    SEPARATOR_PAT = /[#{Regexp.quote File::ALT_SEPARATOR}#{Regexp.quote File::SEPARATOR}]/
+    SEPARATOR_LIST = "#{Regexp.quote File::ALT_SEPARATOR}#{Regexp.quote File::SEPARATOR}"
+    SEPARATOR_PAT = /[#{SEPARATOR_LIST}]/
   else
+    SEPARATOR_LIST = "#{Regexp.quote File::SEPARATOR}"
     SEPARATOR_PAT = /#{Regexp.quote File::SEPARATOR}/
   end
 
+  # Return a pathname which the extention of the basename is substituted by
+  # <i>repl</i>.
+  #
+  # If self has no extension part, <i>repl</i> is appended.
+  def sub_ext(repl)
+    ext = File.extname(@path)
+    self.class.new(@path.chomp(ext) + repl)
+  end
+
   # chop_basename(path) -> [pre-basename, basename] or nil
   def chop_basename(path)
     base = File.basename(path)