Pass changed file as template parameter to watchers

[artsparkAI]

This change makes it so that the watcher command can be passed the changed file path as an argument. This is very useful for running tests without having to re-run the entire suite. It's especially useful for fast iteration when used in conjunction with single test isolation such as it.only.

Changed file as argument

The path of the changed file can be inserted into positional arguments using the template parameter {path}. This speeds up iteration in testing, especially if using single test isolation (for example, by using it.only("test") in mocha.)

Example:

module.exports = {
  watcher: {
    test: {
      tasks: [{ command: 'test', params: { testFiles: ['{path}'] } }],
      files: ['./test/**/*'],
      verbose: true
    }
  }
}

[xanderdeseyn]

Hi, this looks good, thanks for the PR! Is there a reason you removed the dist folder from gitignore?

If possible, please add dist back and remove the build files from the PR, then I will merge :)

[artsparkAI]

Oh sorry I will fix that. That was just a temporary hack for myself so I could point to github directly rather than having to go through NPM publish/install cycle.

[artsparkAI]

@N1ghtly Okay done

[xanderdeseyn]

Merged, thank you for the contribution!