install_hooks.sh

#! /usr/bin/env sh

dir=`realpath $(dirname "$BASH_SOURCE:-0")`
githookdir=`git rev-parse --git-dir`/hooks

# Space separated list of hooks to install
declare -a HOOKS=("pre-commit" "commit-msg")

hookConfigExists="$(git hook list pre-commit 2>/dev/null >> /dev/null ; echo $?)"

for hook in ${HOOKS[@]}; do
    if [ ! -f "${dir}/${hook}" ]; then
        continue
    fi
    # Soft remove the old script in .git/hooks so that git doesn't try to run
    # multiple hooks.
    if [ -f "${githookdir}/${hook}" ]; then
        mv "${githookdir}/${hook}" "${githookdir}/${hook}.old"
    fi
    if [ "$hookConfigExists" -eq "0" ]; then
        git config --unset-all hook.${hook}.command
        git config --add hook.${hook}.command "${dir}/${hook}"
        # There should be a single hook per line and it should point to the
        # git-hooks repository.
        git hook list "${hook}"
    else
        cp ${dir}/${hook} ${githookdir}/${hook}
    fi
done

if [ "$hookConfigExists" -eq "0" ]; then
    echo "If a single command is listed per hook, then this script was succesful."
    echo "Checks will be run at pre-submit."
else
    echo "The 'git hook' command is not available on this device."
    echo "The hooks will be copied to ${githookdir}, but will not automatically remain up-to-date with the git-hooks repository"
done