set up configuration to input subproject's urls and docpath

[pri22296]

Description

• add two new env var SUBPROJECT_URLS and SUBPROJECT_DOCPATHS which would contain comma seperated urls and docpaths respectively.
  A user would be able to set it from the .yaydoc.yml file like this

metadata:
  projectname: testYaydoc2
  author: Priyam Singh
  debug: true
  subproject:
    - url: https://github.com/testYaydoc2.git
      docpath: 'docs'
    - url: https://github.com/testYaydoc.git
      docpath: 'doc'

Resultant output

export DOCTHEME="fossasia_theme"
export SUBPROJECT_DOCPATHS="docs,doc"
export SUBPROJECT_URLS="https://github.com/testYaydoc2.git,https://github.com/testYaydoc.git"
export MARKDOWN_FLAVOUR="markdown_github"
export LOGO=""
export AUTHOR="Priyam Singh"
export VERSION="Jun 21, 2017"
export DOCPATH="docs"
export PROJECTNAME="testYaydoc2"

Related Issue

#160

Motivation and Context

This is required so that user's would be easily able to specify subprojects

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix
• New feature

Checklist:

• I have read the Contribution & Best practices Guide and my PR follows them.
• There is a corresponding issue for this pull request.
• Mentioned the Issue number in the pull request commit message Fixes #<number> commit message
• There is only one commit per issue.

[pri22296]

@imujjwal96 @Sch00lb0y Please review

[imujjwal96]

Looks good to me

[imujjwal96]

Can you show how these Env Vars would look with your example yaml

[pri22296]

@imujjwal96 I have updated the description with the output

[imujjwal96]

@pri22296 any token to check if subprojects exist? Or the presence of values in these two env vars is enuff?

[pri22296]

That logic would have to be handled by the script which clones the subprojects. I think config.py should be limited to reading values from .yaydoc.yml and exporting env vars from that.

[imujjwal96]

@pri22296 What about the name of the subprojects?

[pri22296]

For now let's default with the repository name? or maybe i could add an extra field for it and default it with reponame extracted from the url? any other fields we should expose in the subproject section?

[imujjwal96]

I don't think so

[pri22296]

okay a query! where would we need the subproject's name in the build process?

[imujjwal96]

I guess we won't 👌
We can work with splitting the reponames.