compile solidity files gulp task

gulpfile.js

gulp.task('solc', function() {

  glob([
    'app/contracts/*.sol',
  ], {
    cwd: '.'
  }, function(error, files) {
    var allfiles = '';
    var destpath = '';

    files.forEach(function(file) {
      console.log('compiling sol file', file);

      var fileContent = fs.readFileSync(file, "utf8");

      allfiles += fileContent;
      destpath = require('path').dirname(file);
    });

    // save combined SOL file for later reference
    var combinedFileName = destpath + '/tmp_combined.txt';
    fs.writeFile(combinedFileName, allfiles, 'utf8');

    var solc = require('solc');
    var input = allfiles;
    var output = solc.compile(input, 1); // 1 activates the optimiser
    //console.log(output);
    for (var contractName in output.contracts) {
      var data = {
        bytecode: output.contracts[contractName].bytecode,
        abi: JSON.parse(output.contracts[contractName].interface)
      }
      var outputFileName = destpath + '/' + contractName + ".json";
      console.log('saving to', outputFileName);

      fs.writeFile(outputFileName, JSON.stringify(data), 'utf8');

    }

  });
});