#!/usr/bin/env bash

# Autohook
# A very, very small Git hook manager with focus on automation
# Author:   Nik Kantar <http://nkantar.com>
# Version:  2.1.1
# Website:  https://github.com/nkantar/Autohook
# License: MIT -

# MIT License
#
# Copyright (c) 2017 Nikola Kantar
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


echo() {
    builtin echo "[Autohook] $@";
}


install() {
    hook_types=(
        "applypatch-msg"
        "commit-msg"
        "post-applypatch"
        "post-checkout"
        "post-commit"
        "post-merge"
        "post-receive"
        "post-rewrite"
        "post-update"
        "pre-applypatch"
        "pre-auto-gc"
        "pre-commit"
        "pre-push"
        "pre-rebase"
        "pre-receive"
        "prepare-commit-msg"
        "update"
    )

    repo_root=$(git rev-parse --show-toplevel)
    hooks_dir="$repo_root/.git/hooks"
    autohook_filename="$repo_root/tools/hooks/autohook.sh"
    autohook_path=$(realpath $autohook_filename)
    for hook_type in "${hook_types[@]}"
    do
        hook_symlink="$hooks_dir/$hook_type"
        ln -sf $autohook_path $hook_symlink
    done
}


main() {
    calling_file=$(basename $0)

    if [[ $calling_file == "autohook.sh" ]]
    then
        command=$1
        if [[ $command == "install" ]]
        then
            install
        fi
    else
        repo_root=$(git rev-parse --show-toplevel)
        hook_type=$calling_file
        symlinks_dir="$repo_root/tools/hooks/$hook_type"
        files=("$symlinks_dir"/*)
        number_of_symlinks="${#files[@]}"
        if [[ $number_of_symlinks == 1 ]]
        then
            if [[ "$(basename ${files[0]})" == "*" ]]
            then
                number_of_symlinks=0
            fi
        fi
        echo "Looking for $hook_type scripts to run...found $number_of_symlinks!"
        if [[ $number_of_symlinks -gt 0 ]]
        then
            hook_exit_code=0
            for file in "${files[@]}"
            do
                scriptname=$(basename $file)
                echo "BEGIN $scriptname"
                eval $file &> /dev/null
                script_exit_code=$?
                if [[ $script_exit_code != 0 ]]
                then
                  hook_exit_code=$script_exit_code
                fi
                echo "FINISH $scriptname"
            done
            if [[ $hook_exit_code != 0 ]]
            then
              echo "A $hook_type script yielded negative exit code $hook_exit_code"
              exit $hook_exit_code
            fi
        fi
    fi
}


main "$@"