Pyerector

-- Issue 33 - Traverse up the directory to find the right VCS.

-- Issue 25 - Move BaseIterator and FileMapper logic to Iterator and
Mapper respectively; remove BaseIterator.
-- Issue 26 - Add directory attribute to pyerector.vcs.base.Base
subclasses; move vcs_check under Base as a classmethod.
-- Issue 27 - lazy-evaluating Path works, but not properly integrated
with the rest of the modules.
-- Issue 28 - Allow a cons as a valid return type of Iterator.next;
handle that specially in Mapper.next.
-- Issue 29 - The InitVCS target has been deprecated. The VCS() function
is called just before the package finishes being impored.
-- Issue 30 - pyerector.version.Version is now exported from the package;
it is callable with release number strings to compare with the the
current release number. If greater than the current release,
terminate with an error message.
New target
-- Testonly performs the Unittest task and the Test target now has
the dependencies of "Build, Testonly", with no tasks. This allows
calling the "testonly" target without rebuilding everything.
New task
-- Touch which is similar to the touch(1) command, creating files if
they do not exist.
New type
-- FileVariable allows some deferred resolution; file is loaded when
accessed, not when created.
Other fixes/enhancements:
-- The Exclusions object now accepts three values: True, False and None;
False will still include VCS().directory, and None will not include
any extra values.
-- Change vcs modules to a plugin type setup, using same registration
as being used by Initer; plugins loaded automatically when
pyerector.vcs.VCS is called.
-- Get the proper information back from Mercurial; previously only the
tip was retrieve.
-- Allow for mappers in Tokenize.
-- Typo in Symlinki task.
-- Add *.user and *.date variables from VCS.current_info.
-- Fix the template string for git-log; add an assertion.
-- Tokenize now allows for multiple Iterators/Mappers to be passed.
-- Various fixes to Iterators and Mappers; add uptodates entries in
pyerect.
-- Do not use assertions for type checking.
-- Initer.asserttype returns TypeError now.
-- Blank values for version strings.
-- Get a closer timestamp for svn.date comparison in unittests.
-- Allow an Iterator to be passed to Iterator.adjust.
-- Use th proper version variables.
-- Remove unused u() function.
-- Fix unit tests after making Base.args into a tuple.

-- Issue 9 - Propagate iterator parameters in Initer.get_files.
-- Issue 23 - Add an 'api' module to aid programming
New tasks
-- Scp, perform remote copies (via scp)
-- Ssh, perform a remote command (via ssh)
New iterator/mapper
-- IdentityMapper, destination file is always the destdir value.
Other fixes/enhancements:
-- Allow a Variable instance in a dependencies or tasks sequence.
-- Code cleanup using PyCharm and pylint.
-- Collapse FileSet into BaseIterator, make FileSet same as FileIterator.
-- Greatly simplified the calling system, now allows for nested calls of
Sequential/Parallel.
-- Refactor the "allow" condition in BaseIterator.next to be more
straightforward.
-- Fix the RealClean target, including a fix to Exclusions.
-- Fix to Help target for Targets with no docstring.
-- Fix how the regression module sets the proper sys.path value.
-- Fix condition where exception was shown on Abort.
-- Fixes to Subcommand calls.
-- Change Regression to a Target from a SubPyErector subclass so it can be
called by itself.
-- Create symlinks under regression/ to the proper (local) distribution,
thus overriding sys.path.
-- Move unittest driver script, named "unit-test.py" (to prevent imports)
outside of tasks.py; pass the parameters as a string instead of a
filename.

Other fixes/enhancements:
-- Add (initial) regression tests.
-- Fix BaseIterators to properly handle empty directories with
noglob=True; have Clean Target use DirList.
-- Fix bug when iterator has an empty sequence.
-- Have the Help target depend on InitVCS.
-- Unittest fix for Python3.
-- Fixes found during analysis from PyCharm and pylint.
-- Use short-cut class instead of function-with-mutables for initialization.
-- Some SCM cleanup.

-- Issue 12 - Add ability to specify variables on the command-line (update)
-- Issue 15 - Redesign iterators/mappers
-- Issue 19 - Dirlist does not work as might be expected
-- Issue 20 - Thread-safe operations (update)
-- Issue 21 - Backward compatibility for Verbose
New tasks
-- Echo, displays message
Other fixes/enhancements:
-- Add pyerector.pool.size variable, default to 10, to limit how many
PyThread instances can be created (not including the PyErector instance).
-- Update pyerect to better use iterators.
-- Handle that PyErector always returns an exception, mainly SystemExit
-- Mark as "Failed." instead of "Done." if an error occurs; have
PyErector handle a proper exit status on failure.
-- Update inheritance for LogFormatter - on py2.6, super() throws a TypeError
-- Use of Verbose and Config classes now raise DeprecationWarnings
-- Move noop and noTimer to config module.

-- Issue 11 - Better use of variables; including showing variables on
verbose output of "help" target.
-- Issue 12 - Add ability to specify variables on the command-line:
If a target has an equal sign ("="), then it is taken as a variable
assignment.
-- Issue 13 - Update Version model.
-- Issue 16 - Convert from Config to Variable; Initer.config is kept for
backward compatibility, but just references Variable
-- Issue 18 - Replace Verbose instances with Python's logging module.
-- Add a "DISPLAY" log level above ERROR; keep the display() routine
-- Use new State class instead for noop and noTimer.
-- Issue 20 - Make the product thread-safe
New targets
-- InitVCS, initializes the version control support
New tasks
-- SubPyErector, call other PyErector projects
Other fixes/enhancements:
-- Two new constructs: Sequential and Parallel; Parallel is a subclass of
Sequential; "uptodates", "dependencies" and "tasks" members of implicitly
instances of Sequential; "uptodates" cannot be Parallel, but the other
two can be. Parallel targets/tasks are executed in separate threads but
may access Variables without concern (see Issue 20).
-- Add execution stacks for Target and Task instances; this stack is
displayed instead of Python's on errors.
-- Add default variables on startup:
-- basedir (set by PyErector and Initer instantiation)
-- pyerector.vcs.version
-- pyerector.vcs.branch
-- pyerector.vcs.tags
-- pyerector.release.product
-- pyerector.release.number
-- Handle PYERECTOR_PREFIX envvar better.
-- Remove extraneous "hasformat" functionality.
-- Fixes to unit tests.
-- Better help strings.