SwiftLint was developed by the nice folks @realm. It’s a great open-source tool for establishing and enforcing a formal coding style in Swift. It runs on the command-line, but it can be hooked into Xcode directly too. It also has an “autocorrect” feature, which sweeps through your code and automatically fixes the most trivial violations (e.g., colon positioning, double white spaces, etc.). I created a Git commit hook which does exactly this, every time a team member makes changes.

The shell script itself is simple. Only files changed within the commit will be autocorrected. To prevent inadvertent file corrections, these changes are not automatically included in the current changeset. You will have the chance to review the corrections, and make a new commit to finalize them, or amend the previous commit.

git diff --cached --name-only | grep .swift | while read filename; do
    /usr/local/bin/swiftlint autocorrect --path "$filename"

Install this shell script under the .git/hooks directory of your Git repository. Be sure to name it pre-commit (no file extension).

This commit hook should work fine with whichever Git GUI tool you use, as well as the command-line of course.

Note that each team member has to repeat this installation individually. There is no way to automatically distribute git commit hooks.

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Android device debugging on Linux Mint: “error: insufficient permissions for device: udev requires plugdev group membership”

As I rejoiced in the achievement of finally finding a Linux distro which plays well with my Dell XPS 13 (2019 edition, model 9380), I plugged in my Moto test device, intending to continue working on an Android app. Pressing the Run button promptly made Android Studio (3.4) do its compilation magic, but got stopped in its tracks rather quickly. An angry-looking error message awaited me:

error: insufficient permissions for device: udev requires plugdev group membership

Oops, no device debugging for you.

Android Studio also left a note pointing me to their developer page on the subject. As I suspected, it seemed I had some configuration work left to get device debugging working on Linux. However, following Google’s instructions on setting up adb didn’t do much to resolve my problem. The part about adding yourself to the udev group is important, though, as it’s linked to the actual solution described in the next paragraph.

sudo usermod -aG plugdev $LOGNAME

Adds your user to the plugdev group.

Update: Someone mentioned recently that the below steps may not actually be required; just logging out and back in again at this point, should also do the trick. YMMV of course :-).

An ill-timed dog walk (let’s just say I hadn’t expected to be caught in the middle of a downpour), and a few mildly frustrated Google searches later, I ran across a blog post from 2013 (!) on the subject of “Adding udev rules for USB debugging Android devices“, by Janos Gyerik.

I will not pretend to know why this extra configuration is required, but it describes looking up the device’s identifier and adding it to the aforementioned plugdev access group, so Android Studio can properly access the USB device.

And there you go, a working USB debugging connection to my Android device, thanks to some great advice from 2013!