project type detection heuristic predicate

gistfile1.js

// Detection predicate for Python language & known frameworks
{
  // "exists" property can be a glob as supported by node-glob
  // https://github.com/isaacs/node-glob
  //
  // "grep" property is a JavaScript regular expression as described at
  // https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/RegExp

  // grep looks for the regular expression inside of the 
  // Array predicates have an implicit OR
  // i.e. whichever rule evaluates to true first wins.
  //
  // implicit AND within rules, i.e. each property must be true for the result to be true.
  rules: [
    // If setup.py exists AND it contains the lowercase string "pyramid", it is language python and framework pyramid
    {exists:"setup.py", grep:/pyramid/i, framework:"pyramid", language:"python"},
    // If manage.py exists AND it contains the lowercase string "django", it is language python and framework django
    {exists:"manage.py", grep:/django/i, framework:"django", language:"python"},
    // If setup.py exists, it is language python and framework null (unknown)
    {exists:"setup.py", language:"python", framework:null}
  ]
}