Dynamic build processes with Grunt.js

Question

Dynamic build processes with Grunt.js

Is it possible to read the JSON file of child themes and variables related to each of them and create a dynamically generated build process through grunt.js?

In particular, I have a standard grunt.initConfig()for each JSON object in an external file themes.json, I want to repeat the entire assembly process of the main one grunt.initConfig(), but I need to pass variables (not always the same) through meta associated with each child theme to the assembly process.

I spent a lot of time on this, and I'm starting to think that I grunt.jsjust cannot host the build process I'm looking for. I thought that by creating a mirror hierarchy in a regular meta-value like this

module.exports = function(grunt) {
  grunt.initConfig({
    pkg: '<json:package.json>',
    _themes: '<json:themes.json>',
    recess : 'foo',
    concat : 'bar',
    mincss : 'baz
}

and then inside themes.jsonagain mirrors this structure, but is called into a root configuration file like this

   {
   "themFoo" : {
      "_meta_val_1" : "x",
      "_meta_val_2" : "y",
      "_meta_val_3" : "z",
      "recess" : "<%= recess %>",
      "concat" : "<%= concat %>",
      "mincss" : "<%= min %>"
    }