buildout.packagename is a zc.buildout extension which can be used
to extract the package name of an adjacent setup.py to avoid redundancy.
The extracted name is made available via the package-name variable in
the [buildout] section, i.e. as ${buildout:package-name}.
An example buildout.cfg using the extension might look like this:
[buildout]
extensions = buildout.packagename
parts = app
[app]
recipe = zc.recipe.egg
interpreter = app
eggs = ${buildout:package-name}
Please note that since using this extension only makes sense for
package-specific buildouts, the develop setting is set to "."
for added convenience.