Git pre-commit hook to detect debugging stuff that shouldn't be commited.

pre-commit

#!/bin/sh
# commit without hook:
# git commit --no-verify
#

declare -i REJECTED
REJECTED=0

red="\033[31m"
reset="\033[m"
bold="\033[1m"

git stash -q --keep-index

# detect forbidden strings

while read path
do
    if [ "${path}" != "" ] ; then
        diff=`git diff --cached | grep ^+`
        if [[ -n $diff ]] ; then
            forbidden=`echo "${diff}" | \
                     GREP_COLOR='4;5;37;41' grep -E \
                     --regexp='DO NOT COMMIT' \
                     --regexp='#del'
                     `
            if [[ -n $forbidden ]] ; then
                REJECTED=1
                echo ${bold}${path}
                echo ${reset}${forbidden}
                echo
            fi
        fi
    fi
done <<<  `git diff --cached --name-only | egrep '\.(swift|h|m)$'`

git stash pop -q

if [ $REJECTED -eq 1 ] ; then
    echo ${red}${bold}⚠️" REJECTED COMMIT"
    echo ${red}Found forbidden strings.${reset}
    exit 1
fi

exit 0

I wrap experimental or debugging code with this (using an Xcode snippet):

#warning /////////////////////// DO NOT COMMIT { //////////////////////////////
<#here#>
#warning /////////////////////// } DO NOT COMMIT //////////////////////////////

Then, when I forget to remove them, this is what I see:

And the commit is aborted.

I use tig or just the command line for commits. I didn't test the hook with a GUI git client.