A Git hook written in Swift using NLP to enforce commit message formatting. Checks if the first word of a message is a verb and has an uppercased first letter. chmod +x swibang and then mv to .git/hooks/commit-msg in your repo. Requires Xcode/Command Line tools, and just for fun

swibang

#!/usr/bin/env xcrun swift

import NaturalLanguage

let str = try! String(contentsOfFile: CommandLine.arguments[1]).trimmingCharacters(in: .whitespacesAndNewlines)

print("Analyzing commit message: '\(str)'")
if !str.first!.isUppercase {
  print("\u{001B}[0;31mUppercase the first word of your commit message bro wtf")
  exit(1)
}

let tagger = NLTagger(tagSchemes: [.lexicalClass])
tagger.string = str
let range = str.startIndex ..< str.endIndex

tagger.enumerateTags(in: range, unit: .word, scheme: .lexicalClass) { (tag, _) -> Bool in
  if let tag = tag, tag == .verb {
    print("\u{001B}[0;32mCommit message first word was a verb and had an uppercased first letter - your teammates will thank you")
    exit(0)
  }
  print("\u{001B}[0;31mCommit message first word was not a verb - what kinda message is that?")
  exit(1)
}