Pre-commit hook to block commits that change models without adding a migration script

pre-commit

#!/Users/scottmac/.nvm/v6.3.0/bin/node

/**
 * Pre-commit hook to prevent commits that change models unless they
 * also include a migration file.
 *
 * To skip, use the `--no-verify` option when committing.
 * (useful if you just added a comment to a model)
 */

var exec = require('child_process').exec;
var _ = require('@sailshq/lodash');

// Get the current Git status (in shorthand mode)
exec('git status -s', function(err, stdout, stderr) {
  if (err) { process.exit(0); }

  // Split into individual lines.
  var lines = stdout.split('\n');

  // Flag indicating that a model file has been modified.
  var modifiedModel = false;
  // Flag indicating that a migration file has been added.
  var addedMigration = false;

  // Loop through each line in the output, checking for entries about model files or migrations.
  _.each(lines, function(line) {
    if (line.match(/^[MAD]\s+api\/models\//)) { modifiedModel = true; }
    if (line.match(/^A\s+db\/migrations\//)) { addedMigration = true; }
  });

  // If a model was modified, but no migration was added, bail.
  if (modifiedModel && !addedMigration) {
    console.error('Attempted to commit a new/modified/deleted model without a migration file!');
    process.exit(1);
  }
  process.exit(0);
});