Formatting Dart code before every git commit

Dart's dartfmt tool is a really neat utility to automatically format your code. Use the dartfmt tool in your workflow to ensure your code complies with the Dart style guide.

Of course, you don't want to manually run dartfmt. Instead, you want to automate it. Use git's pre-commit hook to ensure your code is formatted, before it is committed.

Add the following code to your .git/hooks/pre-commit script for your local repo, and make sure the script is executable.

#!/bin/bash

DARTFMT_OUTPUT=`dartfmt -w . | grep Formatted`

if [ -n "$DARTFMT_OUTPUT" ]; then
  echo $DARTFMT_OUTPUT
  echo "Re-attempt commit."
  exit 1
else
  echo "All Dart files formatted correctly. Yay!"
  exit 0

fi

If your code needs formatting, it will be formatted and written to disk. The commit will fail, so you have a chance to inspect the changes.

You can enforce formatting with your Continuous Integration system. Try these instructions to use dartfmt with Travis CI, and fail a build if a file isn't formatted.

Have you integrated dartfmt into your workflow? Let us know in the comments below!

Popular posts from this blog

Lists and arrays in Dart

(This is Part 3 in a series about Dart. Check out Part 2, Function in Dart .) Warning : We expect the Dart libraries to undergo potentially sweeping changes before Dart goes to alpha. This document is relevant as of 2011-12-22. Intro Dart is a "batteries included" effort to help app developers build modern web apps. An important "battery" is the bundled core Dart libraries, providing common and rich functionality. Dart is building a solution for large, complex web apps, and providing well tested, integrated, and common libraries is key to helping a web app developer be more productive out of the box. The Collection libraries are a crucial set of APIs that Dart developers get for free. Much more than simple arrays and maps, the Collection library includes standard ways to filter, iterate, inspect, compose, and sort your data. This post specifically looks at List<E> , Dart's ordered, indexable collection of objects. Aside: The Dart project is lucky
Read more

The 29 Healthiest Foods on the Planet

The 29 Healthiest Foods on the Planet > The following is a "healthy food hot list" consisting of the 29 food that will give you the biggest nutritional bang for you caloric buck, as well as decrease your risk for deadly illnesses like cancer, diabetes and heart disease.
Read more

Converting Array to List in Scala

Now, this has to have a built-in somewhere in Scala , because it just seems too common. So, how to convert an Array to a List in Scala? Why do I need this? I needed to drop to Java for some functionality, which in this case returns an Array. I wanted to get that Array into a List to practice my functional programming skillz. **Update**: I figured out how to convert Arrays to Lists the Scala way. Turns out it's a piece of cake. val myList = List.fromArray(Array("one", "two", "three")) or val myList = Array("one","two","three").elements.toList The call to elements returns an Iterator , and from there you can convert to a List via toList . Nice. Because my first version wasn't actually tail recursive, what follows is a true tail recursive solution, if I were to implement this by hand. The above, built in mechanism is much better, though. object ArrayUtil { def toList[a](array: Array[a]): List[a] = { d
Read more