1.4.0

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@520 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/tempfile.rb

@@ -0,0 +1,94 @@
+#
+# $Id$
+#
+# The class for temporary files.
+#  o creates a temporary file, which name is "basename.pid.n" with mode "w+".
+#  o Tempfile objects can be used like IO object.
+#  o with tmpfile.close(true) created temporary files are removed.
+#  o created files are also removed on script termination.
+#  o with Tempfile#open, you can reopen the temporary file.
+#  o file mode of the temporary files are 0600.
+
+require 'delegate'
+require 'final'
+
+class Tempfile < SimpleDelegator
+  Max_try = 10
+
+  def Tempfile.callback(path)
+    lambda{
+      print "removing ", path, "..." if $DEBUG
+      if File.exist?(path)
+	File.unlink(path) 
+      end
+      if File.exist?(path + '.lock')
+	Dir.rmdir(path + '.lock')
+      end
+      print "done\n" if $DEBUG
+    }
+  end
+
+  def initialize(basename, tmpdir=ENV['TMPDIR']||ENV['TMP']||ENV['TEMP']||'/tmp')
+    umask = File.umask(0177)
+    begin
+      n = 0
+      while true
+	begin
+	  tmpname = sprintf('%s/%s%d.%d', tmpdir, basename, $$, n)
+	  lock = tmpname + '.lock'
+	  unless File.exist?(tmpname) or File.exist?(lock)
+	    Dir.mkdir(lock)
+	    break
+	  end
+	rescue
+	  raise "cannot generate tmpfile `%s'" % tmpname if n >= Max_try
+	  #sleep(1)
+	end
+	n += 1
+      end
+
+      @clean_files = Tempfile.callback(tmpname)
+      ObjectSpace.define_finalizer(self, @clean_files)
+
+      @tmpfile = File.open(tmpname, 'w+')
+      @tmpname = tmpname
+      super(@tmpfile)
+      Dir.rmdir(lock)
+    ensure
+      File.umask(umask)
+    end
+  end
+
+  def Tempfile.open(*args)
+    Tempfile.new(*args)
+  end
+
+  def open
+    @tmpfile.close if @tmpfile
+    @tmpfile = File.open(@tmpname, 'r+')
+    __setobj__(@tmpfile)
+  end
+
+  def close(real=false)
+    @tmpfile.close if @tmpfile
+    @tmpfile = nil
+    if real
+      @clean_files.call
+      ObjectSpace.undefine_finalizer(self)
+    end
+  end
+
+  def path
+    @tmpname
+  end
+end
+
+if __FILE__ == $0
+#  $DEBUG = true
+  f = Tempfile.new("foo")
+  f.print("foo\n")
+  f.close
+  f.open
+  p f.gets # => "foo\n"
+  f.close(true)
+end