grunt-sass multiple src/dest on same structure - sass

Question

I'm working on a multi-website project where all the website share the same structure:
-sites
-site1
-css
-scss
-site2
-css
-scss
In my gruntfile.js i have my sass task wrote this way:
sass: {
options: {
sourceMap: true,
outputStyle: 'compressed'
},
pippo: {
files: {
'sites/site1/css/main.css': 'sites/site1/css/sass/main.scss',
'sites/site2/css/main.css': 'sites/site2/css/sass/main.scss',
}
}
}
is it possible to write it in this way?
sass: {
options: {
sourceMap: true,
outputStyle: 'compressed'
},
pippo: {
files: {
'sites/**/css/main.css': 'sites/**/css/sass/main.scss'
}
}
}
I tested it and it is adding a new ** folder when I build it... Any advice?

Answer 1

after a couple of hours I found a working solution, at the very top of the grunt file I added:
module.exports = function(grunt) {
var fs = require('fs');
console.log("Inside the gruntfile");
//create dynamic list of scss file paths
var objDestSource = {
'public/css/main.css': 'public/css/sass/main.scss'
};
fs.readdirSync('sites').forEach(function(folder){
objDestSource['sites/'+folder+'/css/main.css'] = 'sites/'+folder+'/css/sass/main.scss';
});
console.log(objDestSource);
// end scss function
while in the grunt sass task I just changed to:
sass: {
options: {
sourceMap: true,
outputStyle: 'compressed'
},
taskName: {
files: objDestSource
}
}
and the watch task:
watch: {
sass: {
files: [
'public/css/sass/**/*.scss',
'sites/**/css/sass/**/*.scss'
],
tasks: ['sass'],
options: {
spawn: false
}
}
}
This way I can add a new sub-website without have to edit the gruntfile each time!