duerst	2019-01-06 20:41:12 +0900 (Sun, 06 Jan 2019)

  New Revision: 66738

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66738

  Log:
    simplify filename-related code
    
    (Thanks to Nobuyoshi Nakada for the hint!)

  Modified files:
    trunk/tool/downloader.rb
Index: tool/downloader.rb
===================================================================
--- tool/downloader.rb	(revision 66737)
+++ tool/downloader.rb	(revision 66738)
@@ -84,7 +84,7 @@ class Downloader https://github.com/ruby/ruby/blob/trunk/tool/downloader.rb#L84
           index_file = super(UNICODE_PUBLIC+name_dir_part, "#{name_dir_part}index.html", dir, true, index_options)
           INDEX[:index] = IO.read index_file
         end
-        file_base = name.sub(/^.*\//, '').sub(/\.txt$/, '')
+        file_base = File.basename(name, '.txt')
         beta_name = INDEX[:index].match(/#{file_base}(-[0-9.]+d\d+)?\.txt/)[0]
         # make sure we always check for new versions of files,
         # because they can easily change in the beta period

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