gourmet-generator/lib/runner.js

Code generator using Javascript scripts and mustache templates

var fs = require('fs')
var path = require('path')

var mustache = require('mustache')

// base is the folder where the tt script is located
// all file stuff are related to this base path
var Runner = module.exports.Runner = function() {
  this.scriptPath = null;
  this.base = null;
  this.script = null;
}

Runner.prototype.load = function(scriptPath) {
  this.scriptPath = scriptPath;
  this.base = path.dirname(scriptPath);
  this.script = fs.readFileSync(scriptPath, 'utf8');
}

var API = {
  __base: null,
  args: null,
  write: function(filePath, text) {
    var fp = path.join(API.__base, filePath)
    fs.writeFileSync(fp, text, 'utf8');
  },
  read: function(filePath) {
    var fp = path.join(API.__base, filePath)
    var result = fs.readFileSync(fp, 'utf8');
    return result;
  },
  mustache: function(template, values) {
    var output = mustache.render(template, values);
    return output;
  },
  init: function(filePath, args) {
    var fp = path.join(API.__base, filePath)
    var runner = new Runner();
    runner.load(fp);
    var result = runner.execute(args);
    return result;
  }
}

Runner.prototype.execute = function(args) {

  console.log('--- ---')
  console.log('--- --- Starting runner execute')
  console.log('--- --- path:' + this.scriptPath)
  console.log('--- --- base: ' + this.base)
  console.log('--- --- args: ' + args)
  console.log('--- --- script: ' + this.script)
  console.log('--- ---\n')
  
  var container = '\nfunction execute () {\n' + this.script + '\n}\n\n result = execute();\n'

  var self = this;

  // result is updated inside eval
  var result = null;

  function context () {
    'use strict'

    // put the API on the eval context with name tt
    var tt = API;

    // update the folder of the tt script being executed
    tt.__base = self.base;

    // add the arguments (used when this script is being started by another script)
    tt.args = args;

    eval(container);
  }

  context();

  return result;
}