ZopeSkel is a great tool for generating plone projects structure from
paste templates.
You can install it with:
$ easy_install \
http://svn.plone.org/svn/collective/ZopeSkel/trunk#egg=ZopeSkel-dev
You can list the available templates:
$ paster create --list-templates
Available templates:
archetype: A Plone project that uses Archetypes
basic_namespace: A project with a namespace package
basic_package: A basic setuptools-enabled package
basic_zope: A Zope project
nested_namespace: A project with two nested namespaces.
paste_deploy: A web application deployed through paste.deploy
plone: A Plone project
plone2.5_buildout: A buildout for Plone 2.5 projects
plone2.5_theme: A Theme for Plone 2.5
plone2_theme: A Theme Product for Plone 2.1 & Plone 2.5
plone3_buildout: A buildout for Plone 3 projects
plone3_portlet: A Plone 3 portlet
plone3_theme: A Theme for Plone 3.0
plone_app: A Plone App project
You can start a new project:
$ paster create -t archetypes myproject
...
You have to answer many questions and in the end you will get an archetype based skeleton to start your project.
Now what will you do to add a new plone content type, Zope 3 utility, ...etc ?
You have to create the new files by hand and copy/paste code from other projects. This is not the best approach to the problem.
Martin Aspeli comes with the idea of implementing a paster local commands/templates so one can just add plone content types by running paster local commands inside the project directory.
zopeskel.localcommands is one implementation of such idea.
How to use zopeskel.localcommands
To try it, create a test environment with virtualenv:
$ virtualenv myenv
$ cd myenv
Install my ZopeSkel branch:
$ ./bin/easy_install \
http://svn.plone.org/svn/collective/ZopeSkel/branches/mustap#egg=ZopeSkel-dev
You can check the available templates:
$ ./bin/paster create --list-templates
Nothing special :)
check now the available commands:
$ ./bin/paster --help
...
Commands:
create Create the file layout for a Python distribution
help Display help
make-config Install a package and create a fresh config file/directory
points Show information about entry points
serve Serve the described application
setup-app Setup an application, given a config file
Nothing special too :)
Now create an archetype project as described above, cd to the project folder and
check the available commands:
$ cd myproject
myproject$ ../bin/paster --help
...
Commands:
create Create the file layout for a Python distribution
grep Search project for symbol
help Display help
make-config Install a package and create a fresh config file/directory
points Show information about entry points
serve Serve the described application
setup-app Setup an application, given a config file
ZopeSkel local commands:
addcontent Add plone content types to your project
You get a new section called "ZopeSkel local commands" with one command called "addcontent". This new section is only available if paster detects that your project is "addcontent" aware (more about this later) . To see the list of available templates from this command:
myproject$ ../bin/paster addcontent --list
Available templates:
portlet: A portlet skeleton
To add a portlet to your project, run the following command from anywhere inside your project (you don't need to be in the project's root folder):
myproject$ ../bin/paster addcontent portlet
Enter portlet_name (Portlet name (human readable)) ['Example portlet']: My Portlet
Enter portlet_type_name (Portlet type name (should not contain spaces)) ['ExamplePortlet']: MyPortlet
Enter description (Portlet description) )['']: My Portlet
Recursing into portlets
Copying +portlet_filename+.pt_tmpl to /home/mustapha/Projects/pylonsenv/test/plone/example/portlets/myportlet.pt
Copying +portlet_filename+.py_tmpl to /home/mustapha/Projects/pylonsenv/test/plone/example/portlets/myportlet.py
Recursing into profiles
Recursing into default
Recursing into tests
Copying +portlet_filename+_base.py_tmpl to /home/mustapha/Projects/pylonsenv/test/plone/example/tests/myportlet_base.py
Copying test_+portlet_filename+.py_tmpl to /home/mustapha/Projects/pylonsenv/test/plone/example/tests/test_myportlet.py
You get new files and if you check the configure.zcml in the portlets folder and the portlet.xml in the profiles/default folder, you will see that they are updated too.
How to add new templates ?
The python part is very similar to what you know from ZopeSkel. The only difference is that your template class must inherit from ZopeSkelLocalTemplate.
The template structure on the file system is the same as what you know from ZopeSkel with one difference: if your project has a file with the same name as a template file, the "addcontent" command will try to operate in insert-mode.
To make things easy, let's take Martin's plone 3 portlet template and transform it to zopeskel.localcommands template so you can add as many portlets as you want to your project. Here is the files and the structure we use:
portlets/
+portlet_filename+.pt_tmpl
+portlet_filename+.py_tmpl
configure.zcml_insert
profiles/
default/
portlets.xml_insert
tests/
base_+portlet_filename+.py_tmpl
test_+portlet_filename+portlet.py_tmpl
The files that end with "_tmpl" will be handled as normal ZopeSkel templates.
But the new thing here is the files that end with "_insert". The content of these files will be inserted in the correspondent files of the destination project. As example here is the content of the file portlet.xml_insert:
#<?xml version="1.0"?>
# <!-- This file is used to register new types of
# portlets. It can also be used to register
# completely new column types. See CMFPlone's
# version of this file for more information.
# -->
# <portlets>
# <!-- -*- extra stuff goes here -*- -->
<portlet
addview="${dotted_name}.${portlet_type_name}"
title="${portlet_name}"
description="${description}"
/>
#</portlets>
Here, some notes are needed:
1. If your project contains a file named "profile/default/portlets.xml", only the lines not starting with "#" will be inserted
2. If your project doesn't contain the file "profile/default/portlets.xml", the "#"'s in the beginning of lines will be removed and a profile/default/portlets.xml" file will be created with the hole content. So it is a good idea when creating a new local template to think about how the file will look like if it has to be created from scratch. Look at the zcmlmeta template as example.
Now, if you are asking how "zopeskel.localcommands" knows where (in the destination file) to insert the content of the source file, keep reading.
NOTE: The "_insert" in the end of the name of the template file is required for .py files and optional for other kind of files. For zopeskel.localcommands there is no difference between configure.zcml_insert" and "configure.zcml". Both will be treated in insert-mode. In the case of .py files if you don't add "_insert" in the end of their name, setuptools will fail with 'SyntaxError' when installing ZopeSkel. That's normal because of the template variables in the file. For readability I recommand using the '_insert' syntax.
Now, take a look to the python part. Here is the Portlet class:
from zopeskel import var
from zopeskel.localcommands import ZopeSkelLocalTemplate
class MyPortlet(ZopeSkelLocalTemplate):
"""
A plone 3 portlet skeleton
"""
_template_dir = 'templates/portlet'
summary = "A Plone 3 portlet"
use_cheetah = True
vars = []
vars.append(var('portlet_name',
'Portlet name (human readable)',
default="Example portlet"))
vars.append(var('portlet_type_name',
'Portlet type name (should not contain spaces)',
default="ExamplePortlet"))
vars.append(var('description',
'Portlet description',
default=""))
def pre(self, command, output_dir, vars):
"""
you can use package_namespace, package_namespace2,
package and package_dotted_name of the parent
package here. you get them for free in the vars
argument. ie:
vars['package_namespace'] contains 'plone'
vars['package_namespace2'] contains 'test' or ''
vars['package'] contains 'example'
vars['package_dotted_name'] contains 'plone.test.example'
"""
vars['portlet_filename'] = \
vars['portlet_type_name'].lower()
vars['dotted_name'] = "%s.portlets" % \
vars['package_dotted_name']
Three things to say here:
1. Your template class has to inherit from ZopeSkelLocalTemplate
2. You can get the parent project namespaces and package name for free in the vars argument as you see in the "pre" method.
3. The ZopeSkelLocalTemplate class defines an attribute named "marker_name" like this:
marker_name = "extra stuff goes here"
Your can override it in your template class if you want. The purpose of this marker_name is to tell "addcontent" command where to insert the content if it has to insert something in a file. The correspondent file must include a line containing " -*- marker_name -*-" in our case:
-*- extra stuff goes here -*-
if you look in portlet.xml of your project you will find a line containing:
<!-- -*- extra stuff goes here -*- -->
If you want to know more about marker_name look at insert_into_file method of paste.script.command.Command.
OK, now we have the file system structure and the template class. We need just one more thing: add an egg entry point for our template class to make it available for the "addcontent" command. As I said before it is very similar to how you add a normal ZopeSkel template. The difference is that for normal ZopeSkel templates the entry point is added under [paste.paste_create_template] section, but zopeskel.localcommands adds a new kind of entry points named [zopeskel.zopeskel_sub_template] and our templates have to be added under that section. If you look in the setup.py file of ZopeSkel to the entry_points argument, you will find:
[zopeskel.zopeskel_sub_template]
portlet = zopeskel.localcommands.templates:MyPortlet
Enable "addcontent" in other ZopeSkel templates
To enable "addcontent" command in your current project add a line with "ZopeSkel" to your paster_plugins.txt file of your egg-info folder.
For the moment the "addcontent" command is only enabled for ZopeSkel's archetype template. You can enable "addcontent" command for other ZopeSkel templates by addinng an "egg_plugins" attribute to the template class like this:
egg_plugins = ['ZopeSkel']
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