#!/bin/bash

# Create a pre-push hook driver in this repo. The hook will run all
# excutable scripts in ~/.githooks/<repo name>/pre-push

# Find out the repo name and where the .git directory is for this repo
origin="`git config remote.origin.url`"
repo="`basename -s .git $origin`"
tld="`git rev-parse --show-toplevel`"

# Location for the hooks.
# WARNING: if you change this you'll need to change the value of the
# "hooksdir" variable in the heredoc below as well
hooksdir="$HOME/.githooks/$repo/pre-push"

usage() {
    echo "Usage: `basename $0` [-f|-h]"
    echo
    echo "Install a pre-push hook in $tld/.git/hooks"
    echo "  -f force overwriting existing hooks"
    echo "  -h print this help"
    echo
    exit 0
}

# --- Command line options ---
force=0
while getopts fh opt_arg; do
    case $opt_arg in
        f) force=1 ;;
        *) usage   ;;
    esac
done
shift `expr $OPTIND - 1`
# ----------------------------

set -e

# If there's already a pre-push hook installed bail out, we don't want to
# overwrite it (unless -f is passed in the command line)
pre_push_hook="$tld/.git/hooks/pre-push"

if [ -e "$pre_push_hook" -a $force -eq 0 ]; then
    echo "ERROR: found an existing pre-push hook: $pre_push_hook"
    exit 1
fi

echo -n "Installing pre-push hook in $pre_push_hook: "

cat > $pre_push_hook <<'EOF'
#!/bin/bash

# set GITHOOKS_QUIET to anything to anything to make this script quiet
quiet=${GITHOOKS_QUIET:-""}

origin="`git config remote.origin.url`"
repo="`basename -s .git $origin`"

hooksdir="$HOME/.githooks/$repo/pre-push"
if [ ! -d "$hooksdir" ]; then
    echo
    echo "WARNING:"
    echo "  hooks directory doesn't exist: $hooksdir"
    echo "  pushing anyway"
    echo
    sleep 1
    exit 0
fi

hooksrun=0
allhooks="`/bin/ls -1 $hooksdir 2>/dev/null`"

for hook in `echo $allhooks` ; do
    if [ -x "$hooksdir/$hook" ]; then
        [ -z "$quiet" ] && echo -e "\n=== running hook: $hooksdir/$hook"
        $hooksdir/$hook "$@"
        rc=$?
        hooksrun=$((hooksrun + 1))
        if [ $rc -ne 0 ]; then
            echo
            echo "ERROR: hook $hooksdir/$hook returned non-zero status: $rc"
            echo
            exit $rc
        else
            [ -z "$quiet" ] && echo "=== done."
        fi
    fi
done

if [ $hooksrun -eq 0 ]; then
    echo
    echo "WARNING:"
    echo "  couldn't find any pre-push hooks to run in $hooksdir"
    echo "  pushing anyway"
    sleep 1
fi

echo
exit 0
EOF

chmod +x $pre_push_hook

echo "done."

mkdir -p "$hooksdir"
echo "Now add your favorite pre-push scripts to: $hooksdir"