--- a/rakelib/extensions.rb	Thu Aug 24 01:13:48 2017 +0100
+++ b/rakelib/extensions.rb	Thu Aug 24 09:25:49 2017 +0100
@@ -244,6 +244,9 @@
   # has the same name unless explicitily specified by `archive:` option. 
   # If `remove: true` option is set to true, the `directory` to archive is
   # removed after adding the archive. 
+  #
+  # If `include` is given (i.e., not `nil`), then only files within
+  # `directory` are added to the archive. 
   # 
   # The type of the archive is automatically derived from `archive` name (if 
   # provided) or defaults to `.tar.bz2` on UNIXes and to `.zip` on Windows. 
@@ -262,21 +265,25 @@
   # 
   #     zip '/tmp/build_dir', archive: 'smalltalkx', remove: true
   #  
-  def zip(directory, remove: false, archive: nil, sha256: true)        
+  def zip(directory, remove: false, archive: nil, sha256: true, include: nil)        
     archive = directory unless archive
     if !(archive.end_with? '.zip') && !(archive.end_with? '.tar.gz') && !(archive.end_with? '.tar.bz2')
       archive = "#{directory}#{win32? ? '.zip' : '.tar.bz2'}"
+    end      
+    archive = File.expand_path(archive)
+    source = [ "\"#{File.basename(directory)}\"" ]
+    unless include.nil?
+      source = include.collect { | each | "\"#{File.join(File.basename(directory), each)}\"" }
     end
-        
-    archive = File.expand_path(archive)
+
     chdir File.dirname(directory) do
       case
         when (archive.end_with? '.zip')
-          sh "zip -q -r #{remove ? '-T -m' : ''} \"#{archive}\" \"#{File.basename(directory)}\""
+          sh "zip -q -r #{remove ? '-T -m' : ''} \"#{archive}\" #{source.join(' ')}"
         when (archive.end_with? '.tar.bz2')
-          sh "tar cjf \"#{archive}\" #{remove ? '--remove-files' : ''} \"#{File.basename(directory)}\""
+          sh "tar cjf \"#{archive}\" #{remove ? '--remove-files' : ''} #{source.join(' ')}"
         when (archive.end_with? '.tar.gz')
-          sh "tar czf \"#{archive}\" #{remove ? '--remove-files' : ''} \"#{File.basename(directory)}\""
+          sh "tar czf \"#{archive}\" #{remove ? '--remove-files' : ''} #{source.join(' ')}"
         else
           raise Exception.new("Unknown archive type: #{File.basename(archive)}")
       end      

--- a/tests/tests_extensions.rb	Thu Aug 24 01:13:48 2017 +0100
+++ b/tests/tests_extensions.rb	Thu Aug 24 09:25:49 2017 +0100
@@ -10,8 +10,8 @@
     assert which('boguscommand').nil?
   end
 
-  # A helper for `test_zip()`
-  def test_zip_fmt(fmt)
+  # A helper for `test_zip_01()`
+  def test_zip_01_fmt(fmt)
     Dir.mktmpdir do | tmp |
       chdir File.join(File.dirname(__FILE__), '..') do
         archive = File.join(tmp, "rakelib#{fmt}")
@@ -20,14 +20,15 @@
         unzip archive
         assert File.exist? File.join(tmp, 'rakelib')
         assert File.exist? File.join(tmp, 'rakelib', 'extensions.rb')
+        assert File.exist? File.join(tmp, 'rakelib', 'support.rb')
       end
     end
   end  
 
   def test_zip_01()    
-    test_zip_fmt('.zip') if which 'zip'
-    test_zip_fmt('.tar.bz2') if which 'tar' and which 'bzip2'
-    test_zip_fmt('.tar.gz') if which 'tar' and which 'gzip'
+    test_zip_01_fmt('.zip') if which 'zip'
+    test_zip_01_fmt('.tar.bz2') if which 'tar' and which 'bzip2'
+    test_zip_01_fmt('.tar.gz') if which 'tar' and which 'gzip'
   end
 
   def test_zip_02()     
@@ -41,6 +42,27 @@
       end
     end
   end
+
+  # A helper for `test_zip_03()`
+  def test_zip_03_fmt(fmt)
+    Dir.mktmpdir do | tmp |
+      chdir File.join(File.dirname(__FILE__), '..') do
+        archive = File.join(tmp, "rakelib#{fmt}")
+        zip "rakelib", archive: archive, include: [ 'extensions.rb' ]
+        assert File.exist? archive
+        unzip archive
+        assert File.exist? File.join(tmp, 'rakelib')
+        assert File.exist? File.join(tmp, 'rakelib', 'extensions.rb')
+        assert (not File.exist? File.join(tmp, 'rakelib', 'support.rb'))
+      end
+    end
+  end  
+
+  def test_zip_03()    
+    test_zip_03_fmt('.zip') if which 'zip'
+    test_zip_03_fmt('.tar.bz2') if which 'tar' and which 'bzip2'
+    test_zip_03_fmt('.tar.gz') if which 'tar' and which 'gzip'
+  end
 end
 
 if __FILE__ == $0