The bb and os modules are always imported so having these extra import calls
are a waste of space/execution time. They also set a bad example for people
copy and pasting code so clean them up.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

sed \
 -e 's:bb.data.\(expand([^,()]*\), *\([^) ]*\) *):\2.\1):g' \
 -i `grep -ril bb.data.expand *`

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

The dynamic message domain was introduced by Richard Purdie with the following patch:
http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=a6c48298b17e6a5844b3638b422fe226e3b67b89

Signed-off-by: Samuel Stirtzel <s.stirtzel@googlemail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Signed-off-by: Chris Larson <chris_larson@mentor.com>

This implementation consists of two components:

- Type creation python modules, whose job it is to construct objects of the
  defined type for a given variable in the metadata
- typecheck.bbclass, which iterates over all configuration variables with a
  type defined and uses oe.types to check the validity of the values

This gives us a few benefits:

- Automatic sanity checking of all configuration variables with a defined type
- Avoid duplicating the "how do I make use of the value of this variable"
  logic between its users.  For variables like PATH, this is simply a split(),
  for boolean variables, the duplication can result in confusing, or even
  mismatched semantics (is this 0/1, empty/nonempty, what?)
- Make it easier to create a configuration UI, as the type information could
  be used to provide a better interface than a text edit box (e.g checkbox for
  'boolean', dropdown for 'choice')

This functionality is entirely opt-in right now.  To enable the configuration
variable type checking, simply INHERIT += "typecheck".  Example of a failing
type check:

BAZ = "foo"
BAZ[type] = "boolean"

$ bitbake -p
FATAL: BAZ: Invalid boolean value 'foo'
$

Examples of leveraging oe.types in a python snippet:

PACKAGES[type] = "list"

python () {
    import oe.data
    for pkg in oe.data.typed_value("PACKAGES", d):
        bb.note("package: %s" % pkg)
}

LIBTOOL_HAS_SYSROOT = "yes"
LIBTOOL_HAS_SYSROOT[type] = "boolean"

python () {
    import oe.data
    assert(oe.data.typed_value("LIBTOOL_HAS_SYSROOT", d) == True)
}

Signed-off-by: Chris Larson <chris_larson@mentor.com>