Merged revisions 2136-2200,2202-2290,2292-2301 via svnmerge from

http://scons.tigris.org/svn/scons/branches/core

........
  r2145 | stevenknight | 2007-07-17 09:15:12 -0500 (Tue, 17 Jul 2007) | 3 lines

  Don't put null strings (from variable expansion) in a path list.
  (They get turned into the current directory on later expansion.)
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  r2146 | stevenknight | 2007-07-17 10:47:39 -0500 (Tue, 17 Jul 2007) | 3 lines

  Add support for optional arguments on command-line long options
  by specifying nargs='?'.
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  r2149 | stevenknight | 2007-07-17 15:22:24 -0500 (Tue, 17 Jul 2007) | 2 lines

  Remove left-over Optik mentions.
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  r2150 | stevenknight | 2007-07-17 15:39:34 -0500 (Tue, 17 Jul 2007) | 4 lines

  Add a $SWIGPATH variable for finding SWIG dependencies, with
  $SWIGINC{PREFIX,SUFFIX} for adding them to the command line.
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  r2154 | stevenknight | 2007-07-18 20:05:31 -0500 (Wed, 18 Jul 2007) | 2 lines

  Fix variable misspellings in the doc added for $SWIGOUTPUT.
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  r2155 | stevenknight | 2007-07-18 20:07:28 -0500 (Wed, 18 Jul 2007) | 2 lines

  Add the Python eggs info file to the RPM packaging build.
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  r2156 | stevenknight | 2007-07-18 20:15:08 -0500 (Wed, 18 Jul 2007) | 2 lines

  Convert documentation from DocBook SGML to XML.
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  r2158 | stevenknight | 2007-07-19 17:16:19 -0500 (Thu, 19 Jul 2007) | 3 lines

  Conditionally add the .egg-info the RPM file list only if the distutils
  in the version of Python that rpmbuild will execute knows about them.
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  r2161 | stevenknight | 2007-07-19 19:12:29 -0500 (Thu, 19 Jul 2007) | 5 lines

  Capture a test case (contributed by Tilo Prutz) where instantiation of
  a private class causes javac to generate an additional anonymous inner
  class file.  (No solution yet, but there's no sense throwing away the
  preparatory work.)
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  r2162 | stevenknight | 2007-07-20 11:29:56 -0500 (Fri, 20 Jul 2007) | 3 lines

  Support passing a list of .java files as source to the Java() builder.
  (Leanid Nazdrynau)
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  r2163 | garyo | 2007-07-20 12:00:35 -0500 (Fri, 20 Jul 2007) | 1 line

  Fixed cut-n-paste error in Touch factory method doc in users guide.
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  r2167 | stevenknight | 2007-07-21 22:59:40 -0500 (Sat, 21 Jul 2007) | 2 lines

  Don't execute the SWIGOUTDIR test if swig isn't installed.
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  r2168 | stevenknight | 2007-07-21 23:14:17 -0500 (Sat, 21 Jul 2007) | 2 lines

  Fix the test's ability to run under a path name containing spaces.
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  r2171 | stevenknight | 2007-07-24 15:54:41 -0500 (Tue, 24 Jul 2007) | 2 lines

  Handle white space in key file names in the packaging build.
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  r2172 | stevenknight | 2007-07-24 21:41:15 -0500 (Tue, 24 Jul 2007) | 2 lines

  More efficient copying of construction environments.
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  r2173 | stevenknight | 2007-07-25 10:56:02 -0500 (Wed, 25 Jul 2007) | 2 lines

  Update the SCons build for Subversion and general clean-up.
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  r2174 | stevenknight | 2007-07-25 11:35:16 -0500 (Wed, 25 Jul 2007) | 3 lines

  Suppress the [brackets] around a node in the --tree=prune output if
  the node is a source.
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  r2175 | stevenknight | 2007-07-25 12:52:18 -0500 (Wed, 25 Jul 2007) | 3 lines

  Commonize the skip_test() method and make its behavior configurable
  via a TESTCOMMON_PASS_SKIPS environment variable.
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  r2178 | stevenknight | 2007-07-25 21:43:47 -0500 (Wed, 25 Jul 2007) | 3 lines

  Add $JAVACLASSPATH and $JAVASOURCEPATH construction variables.  (Leanid
  Nazdrynau)
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  r2182 | stevenknight | 2007-07-30 12:10:20 -0500 (Mon, 30 Jul 2007) | 3 lines

  Refactor Builder suffix-adjusting into its own method, so we can
  (potentially) re-use it for Builders with attached source Builders.
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  r2183 | stevenknight | 2007-07-30 14:51:53 -0500 (Mon, 30 Jul 2007) | 2 lines

  More efficient source-builder suffix matching.
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  r2184 | stevenknight | 2007-07-30 16:01:42 -0500 (Mon, 30 Jul 2007) | 4 lines

  Encapsulate initialization of the default FS object by an accessor
  function in SCons.Node.FS.  (This also gets rid of an unnecessary
  reference to SCons.Node.FS.default_fs in the LaTeX scanner.)
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  r2193 | stevenknight | 2007-07-30 18:24:07 -0500 (Mon, 30 Jul 2007) | 3 lines

  Fix interpretation of source arguments that have no suffix when the
  called Builder has both a src_suffix and a src_builder.
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  r2194 | stevenknight | 2007-07-31 10:25:31 -0500 (Tue, 31 Jul 2007) | 2 lines

  Increase the number of tries for random output from three to ten.
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  r2195 | stevenknight | 2007-07-31 10:52:28 -0500 (Tue, 31 Jul 2007) | 3 lines

  Skip the test gracefully if the zipfile module can't read the file it
  just wrote (which is the case for Python 2.1 on 64-bit systems).
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  r2196 | stevenknight | 2007-07-31 13:06:21 -0500 (Tue, 31 Jul 2007) | 2 lines

  Move the "import zipfile" so it doesn't fail on Python <= 2.0.
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  r2197 | stevenknight | 2007-07-31 14:51:50 -0500 (Tue, 31 Jul 2007) | 3 lines

  Commonize initialization of the various Java builders so they can be
  hooked up into a multi-stage Builder chain.  (Leanid Nazdrynau)
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  r2198 | stevenknight | 2007-07-31 16:15:18 -0500 (Tue, 31 Jul 2007) | 3 lines

  Fix use of ${TARGET.dir} and ${SOURCE.dir} expansions in $FORTRANMODDIR
  $JARCHDIR, $JARFLAGS, $LEXFLAGS, $SWIGFLAGS, $SWIGOUTDIR and $YACCFLAGS.
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  r2199 | stevenknight | 2007-07-31 16:25:48 -0500 (Tue, 31 Jul 2007) | 2 lines

  Remove left-over Trace() call.
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  r2202 | stevenknight | 2007-08-01 12:31:48 -0500 (Wed, 01 Aug 2007) | 3 lines

  Bail out via test.skip_test() if wix ("candle") isn't found.
  Put the main body of code flush left instead of under an if: block.
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  r2203 | stevenknight | 2007-08-01 15:35:55 -0500 (Wed, 01 Aug 2007) | 5 lines

  Fix Tool.packaging.rpm.package() so it doesn't always overwrite
  $RPMFLAGS with -ta.
  Set --buildroot in RPM packaging tests so they don't overwrite
  each other when run simultaneously.
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  r2204 | stevenknight | 2007-08-01 15:37:36 -0500 (Wed, 01 Aug 2007) | 2 lines

  Fix a nested scope issue with the internal build_sources() function.
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  r2205 | stevenknight | 2007-08-01 15:46:08 -0500 (Wed, 01 Aug 2007) | 5 lines

  Normalize (X out) the CreationDate field inside embedded, compressed
  PostScript streams within the generated PDF files.  Also normalize
  preceding Length field, since compression length is affected by different
  patterns of input, including the variable CreationDate value.
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  r2211 | stevenknight | 2007-08-02 08:52:06 -0500 (Thu, 02 Aug 2007) | 2 lines

  Add the new modules from branches/packaging to the SCons packaging build.
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  r2212 | stevenknight | 2007-08-02 19:59:01 -0500 (Thu, 02 Aug 2007) | 2 lines

  Fix the JAVACLASSPATH test when javah isn't on the default $PATH.
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  r2214 | stevenknight | 2007-08-03 15:05:21 -0500 (Fri, 03 Aug 2007) | 4 lines

  Hook up the Java builders into a multi-step chain underneath a Java()
  pseudo-builder (wrapper) that examines its arguments and calls the
  appropriate underlying file-or-dir builder.
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  r2215 | stevenknight | 2007-08-03 15:49:58 -0500 (Fri, 03 Aug 2007) | 2 lines

  Fix for old Python versions:  use apply() instead of *args, **kw.
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  r2216 | stevenknight | 2007-08-03 16:49:31 -0500 (Fri, 03 Aug 2007) | 2 lines

  Hook up the SWIG builder as a source builder for .java files.
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  r2217 | stevenknight | 2007-08-03 17:28:19 -0500 (Fri, 03 Aug 2007) | 2 lines

  Don't use .endswith(), which didn't appear until later Python versions.
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  r2218 | stevenknight | 2007-08-03 17:29:38 -0500 (Fri, 03 Aug 2007) | 2 lines

  Replace tabs with spaces.
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  r2219 | stevenknight | 2007-08-04 08:06:23 -0500 (Sat, 04 Aug 2007) | 3 lines

  Initialize a loop-invariant lambda for matching .java suffixes outside
  the loop.
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  r2220 | stevenknight | 2007-08-07 15:06:13 -0500 (Tue, 07 Aug 2007) | 2 lines

  Refactor parallel class-generation loops into one.
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  r2221 | stevenknight | 2007-08-07 16:04:06 -0500 (Tue, 07 Aug 2007) | 5 lines

  Have the Java multi-step builder test actually check for generated files,
  and fix the generation of .java and .class file names, and interaction
  with the SWIG builder, so that the files are generated in the correct
  place.
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  r2222 | stevenknight | 2007-08-07 16:45:05 -0500 (Tue, 07 Aug 2007) | 3 lines

  Fix dependencies on SWIG-generated .java files so they don't have to
  be built in multiple passes.
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  r2226 | stevenknight | 2007-08-07 18:00:22 -0500 (Tue, 07 Aug 2007) | 2 lines

  Fix SWIG when used with BuildDir().
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  r2227 | stevenknight | 2007-08-07 22:15:55 -0500 (Tue, 07 Aug 2007) | 5 lines

  User's guide updates:
  - Make the multiple files example match its text.
  - Expand a truncated sentence about being able to use Python function actions
    in the Command() Builder.
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  r2228 | stevenknight | 2007-08-07 23:25:18 -0500 (Tue, 07 Aug 2007) | 3 lines

  Don't generate an error if a #include file matches a same-named
  directory in $CPPPATH (or $FORTRANPATH, etc.).
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  r2229 | stevenknight | 2007-08-07 23:40:00 -0500 (Tue, 07 Aug 2007) | 2 lines

  Fix a code example.  (Gary Oberbrunner)
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  r2230 | stevenknight | 2007-08-08 00:05:43 -0500 (Wed, 08 Aug 2007) | 3 lines

  Capture a test case to make sure AddPostAction() doesn't interfere
  with normal linking.  (Matt Doar, Gary Oberbrunner)
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  r2233 | stevenknight | 2007-08-08 14:15:44 -0500 (Wed, 08 Aug 2007) | 2 lines

  Fix documentation typo in a construction variable cross-reference.
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  r2234 | stevenknight | 2007-08-08 17:03:25 -0500 (Wed, 08 Aug 2007) | 2 lines

  Changes to SCons packaging to support checkpoint releases.
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  r2235 | stevenknight | 2007-08-09 10:10:01 -0500 (Thu, 09 Aug 2007) | 2 lines

  Sidestep false negatives on heavily loaded systems.
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  r2236 | garyo | 2007-08-09 11:16:26 -0500 (Thu, 09 Aug 2007) | 1 line

  Allow unpackaged files (e.g. *.pyo) to exist in the build dir without being packaged in the RPM.  Without this, on some systems the rpmbuild may error out.
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  r2237 | stevenknight | 2007-08-09 11:27:56 -0500 (Thu, 09 Aug 2007) | 5 lines

  Fix test/SWIG/build-dir.py so it works on old Python versions without
  distutils.sysconfig.
  Instead of just cutting-and-pasting initialization code from other
  SWIG tests, centralize it in some new TestSCons methods.
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  r2238 | garyo | 2007-08-09 11:30:58 -0500 (Thu, 09 Aug 2007) | 1 line

  Use docbook 4.3 instead of 4.4 for the XML doctype since some older(?) jade parsers can't handle new 4-byte Unicode chars in the 4.4 version of isogrk4.ent.
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  r2240 | stevenknight | 2007-08-09 16:35:06 -0500 (Thu, 09 Aug 2007) | 2 lines

  User's Guide updates (post packaging changes).
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  r2243 | stevenknight | 2007-08-10 10:31:51 -0500 (Fri, 10 Aug 2007) | 3 lines

  Fix the User's Guide build to use openjade, and to accomodate a change
  in the name of the main generated file (book1.html => index.html).
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  r2245 | stevenknight | 2007-08-10 11:09:16 -0500 (Fri, 10 Aug 2007) | 2 lines

  Update the {CHANGES,RELEASE}.txt datestamp lines.
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  r2253 | stevenknight | 2007-08-10 16:21:54 -0500 (Fri, 10 Aug 2007) | 2 lines

  Fix the wix Tool module's ability to handle null entries in $PATH.
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  r2261 | stevenknight | 2007-08-11 23:08:12 -0500 (Sat, 11 Aug 2007) | 3 lines

  Remove unnecessary files (.svnt/*, .{ae,cvs}ignore, www/*) from the
  scons-src packages.
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  r2262 | stevenknight | 2007-08-11 23:24:49 -0500 (Sat, 11 Aug 2007) | 2 lines

  Add missing __revision__ lines.
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  r2263 | stevenknight | 2007-08-11 23:33:42 -0500 (Sat, 11 Aug 2007) | 2 lines

  Skip the test if the MANIFEST file hasn't been built.
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  r2264 | stevenknight | 2007-08-11 23:36:30 -0500 (Sat, 11 Aug 2007) | 2 lines

  Add recent compatibility modules to the relevant exceptions lists.
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  r2265 | stevenknight | 2007-08-11 23:39:00 -0500 (Sat, 11 Aug 2007) | 3 lines

  Update __VERSION__ strings in the QMTest/*.py modules, so that packaging
  tests (src/test_*.py) will pass after builds of checkpoint releases.
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  r2266 | stevenknight | 2007-08-12 07:36:19 -0500 (Sun, 12 Aug 2007) | 2 lines

  Add a comment about why we construct the __VERSION__ string at run time.
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  r2267 | stevenknight | 2007-08-12 07:42:30 -0500 (Sun, 12 Aug 2007) | 2 lines

  Avoid reading the MANIFEST file twice.  (Courtesy review by Greg Noel.)
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  r2268 | stevenknight | 2007-08-12 08:14:53 -0500 (Sun, 12 Aug 2007) | 3 lines

  Shift Install() and InstallAs() from being documented as functions
  to being documented as Builders.
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  r2269 | garyo | 2007-08-13 08:49:52 -0500 (Mon, 13 Aug 2007) | 1 line

  Tests: Skip some more Java tests if javac is not installed on the test machine so they don't get marked as failing.
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  r2270 | garyo | 2007-08-13 11:09:39 -0500 (Mon, 13 Aug 2007) | 1 line

  Fixed typo in test (shows up on non-Linux platforms).
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  r2271 | garyo | 2007-08-13 14:09:05 -0500 (Mon, 13 Aug 2007) | 4 lines

  Test portability fixes for Darwin/OSX and IRIX.
  This does not make all the tests pass on those OSes,
  but it takes care of some of the more obvious errors that
  I have time for right now.  More to come.
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  r2272 | stevenknight | 2007-08-13 15:33:29 -0500 (Mon, 13 Aug 2007) | 2 lines

  Tab => space fix.
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  r2273 | stevenknight | 2007-08-13 15:33:52 -0500 (Mon, 13 Aug 2007) | 2 lines

  Test for swig, too, which is used to build from the .i file.
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  r2277 | garyo | 2007-08-14 10:40:00 -0500 (Tue, 14 Aug 2007) | 8 lines

  Test portability on IRIX: test/Actions/pre-post creates target file
  before building target, then IRIX CC does not chmod +x afterwards.
  I think this change is safe on all OSes.

  test/AS/ml.py: I think this is only supposed to be run on win32
  (not skipped only on win32); the sense of the skip test was backwards.
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  r2278 | stevenknight | 2007-08-14 11:04:40 -0500 (Tue, 14 Aug 2007) | 2 lines

  Add -tt when running tests, to catch inconsistent tab usage.
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  r2279 | stevenknight | 2007-08-14 14:00:43 -0500 (Tue, 14 Aug 2007) | 2 lines

  Minor refactor of logic in File.retrieve_from_cache().
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  r2280 | stevenknight | 2007-08-15 01:11:40 -0500 (Wed, 15 Aug 2007) | 2 lines

  Refactor CacheDir support into its own module.
........
  r2281 | stevenknight | 2007-08-15 07:24:51 -0500 (Wed, 15 Aug 2007) | 2 lines

  Move the cachepath() method from FS.File to the CacheDir class.
........
  r2282 | stevenknight | 2007-08-15 08:31:34 -0500 (Wed, 15 Aug 2007) | 2 lines

  Python 1.5.2 fix in the new Null class.
........
  r2283 | stevenknight | 2007-08-15 10:45:53 -0500 (Wed, 15 Aug 2007) | 5 lines

  Refactor CacheDir unit tests to:
  - restore functionality that was dropped in the transition;
  - commonize creation of test Nodes and other (mock) objects
  - separate CacheDir tests from tests of CacheDir through Node.FS.File.
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  r2284 | stevenknight | 2007-08-15 11:46:38 -0500 (Wed, 15 Aug 2007) | 3 lines

  Replace the Executor.Null.NullEnvironment object with a real Null object,
  so it will absorb the CacheDir method calls as well.
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  r2285 | stevenknight | 2007-08-15 11:52:57 -0500 (Wed, 15 Aug 2007) | 5 lines

  Add a get_CacheDir() method to a construction environment, which will
  be used to fetch per-environment CacheDir specifications.  (Right now
  all calls to it still just return the one attached to underlying default
  FS object.)
........
  r2286 | stevenknight | 2007-08-15 15:15:46 -0500 (Wed, 15 Aug 2007) | 2 lines

  Support per-construction-environment configuration of CacheDir().
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  r2287 | stevenknight | 2007-08-15 15:33:04 -0500 (Wed, 15 Aug 2007) | 2 lines

  Move the tests of CacheDir()-related command-line options into test/CacheDir.
........
  r2293 | stevenknight | 2007-08-16 11:14:49 -0500 (Thu, 16 Aug 2007) | 3 lines

  Add the Package() builder description to the documentation build,
  fixing the XML so that it will build.
........
  r2294 | stevenknight | 2007-08-16 12:51:19 -0500 (Thu, 16 Aug 2007) | 3 lines

  Reorganize packaging documentation:  alphabetize the variable definitions
  (and function names), document Tag() as a function, not a builder.
........
  r2296 | stevenknight | 2007-08-16 12:55:01 -0500 (Thu, 16 Aug 2007) | 2 lines

  Add a build command.
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  r2300 | stevenknight | 2007-08-16 16:49:13 -0500 (Thu, 16 Aug 2007) | 2 lines

  First cut at documenting packaging variables.
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  r2301 | stevenknight | 2007-08-16 16:51:21 -0500 (Thu, 16 Aug 2007) | 3 lines

  Construct the .src.rpm and .arch.rpm file names independnetly, not
  by trying to massage one into the other.
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1 files changed, 425 insertions, 0 deletions

diff --git a/doc/user/factories.xml b/doc/user/factories.xml
new file mode 100644
index 0000000..7c09e4b
--- /dev/null
+++ b/doc/user/factories.xml
@@ -0,0 +1,425 @@
+<!--
+
+  __COPYRIGHT__
+
+  Permission is hereby granted, free of charge, to any person obtaining
+  a copy of this software and associated documentation files (the
+  "Software"), to deal in the Software without restriction, including
+  without limitation the rights to use, copy, modify, merge, publish,
+  distribute, sublicense, and/or sell copies of the Software, and to
+  permit persons to whom the Software is furnished to do so, subject to
+  the following conditions:
+
+  The above copyright notice and this permission notice shall be included
+  in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+  KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+  WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+-->
+
+  <para>
+
+  &SCons; provides a number of platform-independent functions,
+  called <literal>factories</literal>,
+  that perform common file system manipulations
+  like copying, moving or deleting files and directories,
+  or making directories.
+  These functions are <literal>factories</literal>
+  because they don't perform the action
+  at the time they're called,
+  they each return an &Action; object
+  that can be executed at the appropriate time.
+
+  </para>
+
+  <section>
+  <title>Copying Files or Directories:  The &Copy; Factory</title>
+
+    <para>
+
+    Suppose you want to arrange to make a copy of a file,
+    and the &Install; builder isn't appropriate
+    because it may make a hard link on POSIX systems.
+    One way would be to use the &Copy; action factory
+    in conjunction with the &Command; builder:
+
+    </para>
+
+    <programlisting>
+        Command("file.out", "file.in", Copy("$TARGET", "$SOURCE"))
+    </programlisting>
+
+    <para>
+
+    Notice that the action returned by the &Copy; factory
+    will expand the &cv-link-TARGET; and &cv-link-SOURCE; strings
+    at the time &file_out; is built,
+    and that the order of the arguments
+    is the same as that of a builder itself--that is,
+    target first, followed by source:
+
+    </para>
+
+    <screen>
+       % <userinput>scons -Q</userinput>
+       Copy("file.out", "file.in")
+    </screen>
+
+    <para>
+
+    You can, of course, name a file explicitly
+    instead of using &cv-TARGET; or &cv-SOURCE;:
+
+    </para>
+
+    <programlisting>
+      Command("file.out", [], Copy("$TARGET", "file.in"))
+    </programlisting>
+
+    <para>
+
+    Which executes as:
+
+    </para>
+
+    <screen>
+      % <userinput>scons -Q</userinput>
+      Copy("file.out", "file.in")
+    </screen>
+
+    <para>
+
+    The usefulness of the &Copy; factory
+    becomes more apparent when
+    you use it in a list of actions
+    passed to the &Command; builder.
+    For example, suppose you needed to run a
+    file through a utility that only modifies files in-place,
+    and can't "pipe" input to output.
+    One solution is to copy the source file
+    to a temporary file name,
+    run the utility,
+    and then copy the modified temporary file to the target,
+    which the &Copy; factory makes extremely easy:
+
+    </para>
+
+    <programlisting>
+      Command("file.out", "file.in",
+              [
+                Copy("tempfile", "$SOURCE"),
+                "modify tempfile",
+                Copy("$TARGET", "tempfile"),
+              ])
+    </programlisting>
+
+    <para>
+
+    The output then looks like:
+
+    </para>
+
+    <screen>
+      % <userinput>scons -Q</userinput>
+      Copy("tempfile", "file.in")
+      modify tempfile
+      Copy("file.out", "tempfile")
+    </screen>
+
+  </section>
+
+  <section>
+  <title>Deleting Files or Directories:  The &Delete; Factory</title>
+
+    <para>
+
+    If you need to delete a file,
+    then the &Delete; factory
+    can be used in much the same way as
+    the &Copy; factory.
+    For example, if we want to make sure that
+    the temporary file
+    in our last example doesn't exist before
+    we copy to it,
+    we could add &Delete; to the beginning
+    of the command list:
+
+    </para>
+
+    <programlisting>
+      Command("file.out", "file.in",
+              [
+                Delete("tempfile"),
+                Copy("tempfile", "$SOURCE"),
+                "modify tempfile",
+                Copy("$TARGET", "tempfile"),
+              ])
+    </programlisting>
+
+    <para>
+
+    When then executes as follows:
+
+    </para>
+
+    <screen>
+      % <userinput>scons -Q</userinput>
+      Delete("tempfile")
+      Copy("tempfile", "file.in")
+      modify tempfile
+      Copy("file.out", "tempfile")
+    </screen>
+
+    <para>
+
+    Of course, like all of these &Action; factories,
+    the &Delete; factory also expands
+    &cv-link-TARGET; and &cv-link-SOURCE; variables appropriately.
+    For example:
+
+    </para>
+
+    <programlisting>
+      Command("file.out", "file.in",
+              [
+                Delete("$TARGET"),
+                Copy("$TARGET", "$SOURCE")
+              ])
+    </programlisting>
+
+    <para>
+
+    Executes as:
+
+    </para>
+
+    <screen>
+      % <userinput>scons -Q</userinput>
+      Delete("file.out")
+      Copy("file.out", "file.in")
+    </screen>
+
+    <para>
+
+    (Note, however, that you typically don't need to
+    call the &Delete; factory explicitly in this way;
+    by default, &SCons; deletes its target(s)
+    for you before executing any action.
+
+    </para>
+
+  </section>
+
+  <section>
+  <title>Moving (Renaming) Files or Directories:  The &Move; Factory</title>
+
+    <para>
+
+    The &Move; factory
+    allows you to rename a file or directory.
+    For example, if we don't want to copy the temporary file,
+    we could:
+
+    </para>
+
+    <programlisting>
+      Command("file.out", "file.in",
+              [
+                Copy("tempfile", "$SOURCE"),
+                "modify tempfile",
+                Move("$TARGET", "tempfile"),
+              ])
+    </programlisting>
+
+    <para>
+
+    Which would execute as:
+
+    </para>
+
+    <screen>
+      % <userinput>scons -Q</userinput>
+      Copy("tempfile", "file.in")
+      modify tempfile
+      Move("file.out", "tempfile")
+    </screen>
+
+  </section>
+
+  <section>
+  <title>Updating the Modification Time of a File:  The &Touch; Factory</title>
+
+    <para>
+
+    If you just need to update the
+    recorded modification time for a file,
+    use the &Touch; factory:
+
+    </para>
+
+    <programlisting>
+      Command("file.out", "file.in",
+              [
+                Copy("$TARGET", "$SOURCE"),
+                Touch("$TARGET"),
+              ])
+    </programlisting>
+
+    <para>
+
+    Which executes as:
+
+    </para>
+
+    <screen>
+      % <userinput>scons -Q</userinput>
+      Copy("file.out", "file.in")
+      Touch("file.out")
+    </screen>
+
+  </section>
+
+  <section>
+  <title>Creating a Directory:  The &Mkdir; Factory</title>
+
+    <para>
+
+    If you need to create a directory,
+    use the &Mkdir; factory.
+    For example, if we need to process
+    a file in a temporary directory
+    in which the processing tool
+    will create other files that we don't care about, 
+    you could:
+
+    </para>
+
+    <programlisting>
+      Command("file.out", "file.in",
+              [
+                Delete("tempdir"),
+                Mkdir("tempdir"),
+                Copy("tempdir/${SOURCE.file}", "$SOURCE"),
+                "process tempdir",
+                Move("$TARGET", "tempdir/output_file"),
+                Delete("tempdir"),
+              ])
+    </programlisting>
+
+    <para>
+
+    Which executes as:
+
+    </para>
+
+    <screen>
+      % <userinput>scons -Q</userinput>
+      Delete("tempdir")
+      Mkdir("tempdir")
+      Copy("tempdir/file.in", "file.in")
+      process tempdir
+      Move("file.out", "tempdir/output_file")
+      scons: *** [file.out] No such file or directory
+    </screen>
+
+  </section>
+
+  <section>
+  <title>Changing File or Directory Permissions:  The &Chmod; Factory</title>
+
+    <para>
+
+    To change permissions on a file or directory,
+    use the &Chmod; factory.
+    The permission argument uses POSIX-style
+    permission bits and should typically
+    be expressed as an octal,
+    not decimal, number:
+
+    </para>
+
+    <programlisting>
+      Command("file.out", "file.in",
+              [
+                Copy("$TARGET", "$SOURCE"),
+                Chmod("$TARGET", 0755),
+              ])
+    </programlisting>
+
+    <para>
+
+    Which executes:
+
+    </para>
+
+    <screen>
+      % <userinput>scons -Q</userinput>
+      Copy("file.out", "file.in")
+      Chmod("file.out", 0755)
+    </screen>
+
+  </section>
+
+  <section>
+  <title>Executing an action immediately:  the &Execute; Function</title>
+
+    <para>
+
+    We've been showing you how to use &Action; factories
+    in the &Command; function.
+    You can also execute an &Action; returned by a factory
+    (or actually, any &Action;)
+    at the time the &SConscript; file is read
+    by wrapping it up in the &Execute; function.
+    For example, if we need to make sure that
+    a directory exists before we build any targets,
+
+
+    </para>
+
+    <programlisting>
+      Execute(Mkdir('/tmp/my_temp_directory'))
+    </programlisting>
+
+    <para>
+
+    Notice that this will
+    create the directory while
+    the &SConscript; file is being read:
+
+    </para>
+
+    <screen>
+      % <userinput>scons</userinput>
+      scons: Reading SConscript files ...
+      Mkdir("/tmp/my_temp_directory")
+      scons: done reading SConscript files.
+      scons: Building targets ...
+      scons: `.' is up to date.
+      scons: done building targets.
+    </screen>
+
+    <para>
+
+    If you're familiar with Python,
+    you may wonder why you would want to use this
+    instead of just calling the native Python
+    <function>os.mkdir()</function> function.
+    The advantage here is that the &Mkdir;
+    action will behave appropriately if the user
+    specifies the &SCons; <option>-n</option> or
+    <option>-q</option> options--that is,
+    it will print the action but not actually
+    make the directory when <option>-n</option> is specified,
+    or make the directory but not print the action
+    when <option>-q</option> is specified.
+
+    </para>
+
+  </section>