git pre-commit hooks to forbid DNC messages, as seen on https://guywaldman.com/blog/git-hooks

pre-commit

#!/usr/bin/env bash

# Forbidden phrases.
FORBIDDEN_PHRASES=("DNC" "DO NOT COMMIT" "TODO(PR)")

# ANSI color codes.
CLEAR="\033[0m"
RED="\033[00;31m"
BLUE="\033[00;34m"

violation_output=""

# Go over the staged changes, and if any of the forbidden phrases is used,
# add an appropriate message to the output.
for forbidden_word in "${FORBIDDEN_PHRASES[@]}"; do
	changed_file_names=$(git diff --cached --name-only)
	for changed_file_name in $changed_file_names; do
		changed_file_content=$(git diff HEAD --no-ext-diff -U0 --exit-code -a --no-prefix $changed_file_name | egrep "^\+")
		if echo $changed_file_content | grep -q "$forbidden_word"; then
			violation_output+="${CLEAR} • ${BLUE}${changed_file_name}${CLEAR} contains ${RED}\"$forbidden_word\"${CLEAR}\n"
		fi
	done
done

# If there are any violations, print the output and exit with an error code.
if [[ ! -z $violation_output ]]; then
	printf "COMMIT REJECTED DNC violation): see below for details\n"
	printf "$violation_output"
	exit 1
fi

# If there are no violations, exit without an error code.
exit 0

pre-commit.ps1

#!/usr/bin/env pwsh

# Forbidden phrases.
$FORBIDDEN_PHRASES = "DNC", "DO NOT COMMIT", "TODO(PR)"

$violations = ""

# Go over the staged changes, and if any of the forbidden phrases is used,
# add an appropriate message to the output.
foreach ($forbiddenWord in $FORBIDDEN_PHRASES) {
	$changedFileNames = "$(git diff --cached --name-only)"
	foreach ($changedFileName in $changedFileNames) {
		$changedFileContent = $(git diff HEAD --no-ext-diff --unified=0 --exit-code -a --no-prefix $changedFileName | Select-String "^\+")
		foreach ($line in $changedFileContent) {
			if ($line -Match $forbiddenWord) {
				$violations += "$($PSStyle.Reset) • "
				$violations += "$($PSStyle.Foreground.Blue)${changedFileName} contains: $($PSStyle.Reset)"
				$violations += "$($PSStyle.Foreground.Red)${forbiddenWord}$($PSStyle.Reset)"
				$violations += "`n" # PowerShell newline. Yes... I know ¯\_(ツ)_/¯
			}
		}
	}
}

# If there are any violations, print the output and exit with an error code.
if ($violations) {
	Write-Host "COMMIT REJECTED DNC violation): see below for details"
	Write-Host $violations
	exit 1
}

# If there are no violations, exit without an error code.
exit 0