[sauerbraten]

The code in the screenshot is valid Go (switching on strings, no parentheses around the if condition, incrementing a map value using ++) and could even be the output of go fmt (with the { on the same line as the if).

The app itself appears to be written in Ruby (the github link is posted elsewhere in the comments), and looking at the image included in the article further down I assume the code is from a Go app that takes the Ruby app's logs and generates some statistics.