Release 0.4: tagging released revisiondocutils-0.4

git-svn-id: http://svn.code.sf.net/p/docutils/code/tags/docutils-0.4@4268 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

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+===============================================
+ Inside A Docutils Command-Line Front-End Tool
+===============================================
+
+:Author: David Goodger
+:Contact: goodger@python.org
+:Date: $Date$
+:Revision: $Revision$
+:Copyright: This document has been placed in the public domain.
+
+`The Docutils Publisher`_ class was set up to make building
+command-line tools easy.  All that's required is to choose components
+and supply settings for variations.  Let's take a look at a typical
+command-line front-end tool, ``tools/rst2html.py``, from top to
+bottom.
+
+On Unixish systems, it's best to make the file executable (``chmod +x
+file``), and supply an interpreter on the first line, the "shebang" or
+"hash-bang" line::
+
+    #!/usr/bin/env python
+
+Windows systems can be set up to associate the Python interpreter with
+the ``.py`` extension.
+
+Next are some comments providing metadata::
+
+    # Author: David Goodger
+    # Contact: goodger@python.org
+    # Revision: $Revision: ...
+    # Date: $Date: ...
+    # Copyright: This module has been placed in the public domain.
+
+The module docstring describes the purpose of the tool::
+
+    """
+    A minimal front end to the Docutils Publisher, producing HTML.
+    """
+
+This next block attempts to invoke locale support for
+internationalization services, specifically text encoding.  It's not
+supported on all platforms though, so it's forgiving::
+
+    try:
+        import locale
+        locale.setlocale(locale.LC_ALL, '')
+    except:
+        pass
+
+The real work will be done by the code that's imported here::
+
+    from docutils.core import publish_cmdline, default_description
+
+We construct a description of the tool, for command-line help::
+
+    description = ('Generates (X)HTML documents from standalone '
+                   'reStructuredText sources.  ' + default_description)
+
+Now we call the Publisher convenience function, which takes over.
+Most of it's defaults are used ("standalone" Reader,
+"reStructuredText" Parser, etc.).  The HTML Writer is chosen by name,
+and a description for command-line help is passed in::
+
+    publish_cmdline(writer_name='html', description=description)
+
+That's it!  `The Docutils Publisher`_ takes care of the rest.
+
+.. _The Docutils Publisher: ./publisher.html