Need help with generating GUID/UUID values for context variables

• Cookiecutter version: 1.6
• Template project url: none
• Python version: 3.7 (virtual env created using win python 3.7 x64)
• Operating System: Windows 10, 64 Bit

Description:

First off many thanks for creating this project ! Here is some context of what I am trying to do and where I need some guidance

• I am trying to use CC to generate new a Visual Studio 2017 solution and project files with a particular folder/file organization that I like
• I was able to most of it working but for the below:
• Parts of the above project, solution files involves generating several unique GUIDs
• my first approach was creating a pre_gen_project.py inside the hooks folder and update/create new variables that could be added to the ones loaded from cookiecutter.json or entered by the user
• I was however blocked as I could not figure out how to access the context being used by CC and the jinja2 engine
• I proceeded to go over the many issues on github and found some related ones like the following: #60, #102, #180, #288 but no clear answer on how to achieve what I’d like
• I also followed some others issues that suggested creating custom jinja2 extension/filter (#944) but I couldnt figure out how or where to put them in the template folder so the cookiecutter.exe can identify them and pick them up
• Lastly, I also tried going over the CC source code and tried to create a new executable from my script (similar to cli.py) that passes the guids via the extra_context to cookiecutter.main(...) but ran into some other problems that I am still trying to figure out

Appreciate any pointers on how I can inject GUID values for the context variables

[gmr]

Having a pre-hook for computing values that are injected into the context for use in templates would be very useful.

[glenfant]

Computing new Jinja context variables in the pre hook would be a great feature.