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diff --git a/lib/sisu/v5/zap.rb b/lib/sisu/v5/zap.rb
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+# encoding: utf-8
+=begin
+
+ * Name: SiSU
+
+ * Description: a framework for document structuring, publishing and search
+
+ * Author: Ralph Amissah
+
+ * Copyright: (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
+   2007, 2008, 2009, 2010, 2011, 2012, 2013 Ralph Amissah, All Rights Reserved.
+
+ * License: GPL 3 or later:
+
+   SiSU, a framework for document structuring, publishing and search
+
+   Copyright (C) Ralph Amissah
+
+   This program is free software: you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the Free
+   Software Foundation, either version 3 of the License, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+   more details.
+
+   You should have received a copy of the GNU General Public License along with
+   this program. If not, see <http://www.gnu.org/licenses/>.
+
+   If you have Internet connection, the latest version of the GPL should be
+   available at these locations:
+   <http://www.fsf.org/licensing/licenses/gpl.html>
+   <http://www.gnu.org/licenses/gpl.html>
+
+   <http://www.sisudoc.org/sisu/en/manifest/gpl.fsf.html>
+
+ * SiSU uses:
+   * Standard SiSU markup syntax,
+   * Standard SiSU meta-markup syntax, and the
+   * Standard SiSU object citation numbering and system
+
+ * Hompages:
+   <http://www.jus.uio.no/sisu>
+   <http://www.sisudoc.org>
+
+ * Download:
+   <http://www.sisudoc.org/sisu/en/SiSU/download.html>
+
+ * Git
+   <http://sources.sisudoc.org/gitweb/?p=code/sisu.git;a=summary>
+   <http://sources.sisudoc.org/?p=code/sisu.git;a=blob;f=lib/sisu/v5/zap.rb;hb=HEAD>
+
+ * Ralph Amissah
+   <ralph@amissah.com>
+   <ralph.amissah@gmail.com>
+
+ ** Description: zap wipe clean previous output of the type specified
+
+=end
+module SiSU_Zap
+  require_relative 'sysenv'                             # sysenv.rb
+    include SiSU_Env
+  pwd=Dir.pwd
+  class Source
+    def initialize(opt)
+      @opt=opt
+      @env=SiSU_Env::InfoEnv.new(opt.fns)
+    end
+    def read
+      zap_path="#{@env.path.output}/#{@env.fnb}"
+      z=SiSU_Env::CleanOutput.new(@opt)
+      if SiSU_Env::InfoSettings.new.permission?('zap')
+        unless @opt.cmd =~/q/
+          tell=SiSU_Screen::Ansi.new(@opt.cmd,"Clean files related to processing #{@opt.cmd} ->","#{@opt.fns} -> #{zap_path}")
+          tell.warn
+        end
+        z.zap.remove_output
+      else
+        unless @opt.cmd =~/q/
+          tell=SiSU_Screen::Ansi.new(@opt.cmd,'use of -Z (zap) has not enabled in sisurc.yml')
+          tell.warn
+        end
+      end
+    end
+  end
+end
+__END__