setup.sh

#!/usr/bin/env bash

function abspath {
    if [[ -d "$1" ]]; then
        pushd "$1" >/dev/null
        pwd
        popd >/dev/null
    elif [[ -e $1 ]]; then
        pushd "$(dirname "$1")" >/dev/null
        echo "$(pwd)/$(basename "$1")"
        popd >/dev/null
    else
        echo "$1" does not exist! >&2
        return 127
    fi
}

function root_check {
	if [[ $EUID -ne 0 ]]; then
		>&2 echo "Please run script with 'sudo $(basename $0) $@', exiting..."
		exit 1
	fi
}

SCRIPT_NAME=$0
BASE_DIR=$(dirname $(abspath $0))
INSTALL_INTO=/usr/local/bin
COMMANDS='osagetlang osagitfilter'
LOG_PATH=~/Library/Logs/Catsdeep/

if [[ $1 = configure ]]; then
	echo "Trying to install the osagitfilter-commands"
  if [[ ! -d $INSTALL_INTO ]]; then
    echo "! ERROR: the folder $INSTALL_INTO doesn't exist on your system."
    echo
    echo "Create it with: sudo ${SCRIPT_NAME} create_local_bin"
    exit 1
  fi
	for CMD in $COMMANDS; do
		if [[ -f $INSTALL_INTO/$CMD ]]; then
			echo "- ERROR: the command '$CMD' is already exists in '$INSTALL_INTO'. No install."
		else
			if ln -s $BASE_DIR/$CMD.sh $INSTALL_INTO/$CMD; then
				echo "- '$CMD' installed"
			else
				echo "- ERROR: couldn't create symbolic link ($?)"
			fi
		fi
	done
	if [[ $(which git) ]]; then
		if [[ $2 == "--no-git" ]]; then
			echo "Skipping git config"
		elif [[ $2 == "--git-log" ]]; then
			echo "Configuring git with logging options switched on"
			git config --global filter.osa.clean "$INSTALL_INTO/osagitfilter clean --log %f" 
			git config --global filter.osa.smudge "$INSTALL_INTO/osagitfilter smudge --log %f" 
			git config --global filter.osa.required "true"
		else
			echo "Configuring git"
			git config --global filter.osa.clean "osagitfilter clean %f"
			git config --global filter.osa.smudge "osagitfilter smudge %f"
			git config --global filter.osa.required "true"
		fi
	else
		echo "git is not found; filter is not configured."
	fi
elif [[ $1 = reset ]]; then
	for CMD in $COMMANDS; do
		if [[ -h $INSTALL_INTO/$CMD ]]; then
			if rm -f $INSTALL_INTO/$CMD; then
				echo "- '$CMD' reset"
			else
				echo "- ERROR: couldn't remove '$CMD' ($?)"
			fi
		else
			echo "- ERROR: the command '$CMD' is not installed in '$INSTALL_INTO' as symbolic link."
		fi
	done
	if [[ $(which git) ]]; then
		echo "Removing git configuration"
		git config --global --remove-section filter.osa
	else
		echo "git is not found; filter is not removed."
	fi
elif [[ $1 = rotate ]]; then
	LOG_NAME=osagitfilter
	ROTATE_STAMP=$(date "+%Y-%m-%dT%H-%M-%S")
	if [[ -d $LOG_PATH ]]; then
		echo "Rotating log (if any) in $LOG_PATH:"
		if [[ -f $LOG_PATH/$LOG_NAME.log ]]; then
			echo "- renaming $LOG_NAME.log -> ${ROTATE_STAMP}_$LOG_NAME.log"
			mv $LOG_PATH/$LOG_NAME.log $LOG_PATH/${ROTATE_STAMP}_$LOG_NAME.log
		fi
	else
		echo "Creating log directory, nothing to rotate"
		mkdir -p $LOG_PATH
	fi
	touch $LOG_PATH/$LOG_NAME.log
elif [[ $1 = create_local_bin ]]; then
  root_check
  if [[ ! -d $INSTALL_INTO ]]; then
    echo "Creating $INSTALL_INTO"
    mkdir $INSTALL_INTO
  fi
  if [[ $(stat -f '%u' $INSTALL_INTO) != $(id -u ${SUDO_USER}) ]]; then
    echo "Change ownership to ${SUDO_USER}:admin"
    chown -R ${SUDO_USER}:admin $INSTALL_INTO
  fi
  if [[ ":$PATH:" == *":$INSTALL_INTO:"* ]]; then
    echo "The folder $INSTALL_INTO is created successfully."
    echo "Next you can run: $SCRIPT_NAME configure"
  else
    echo "You should add $INSTALL_INTO to your PATH variable. This should be the case on every macOS install."
    echo "You should solve this yourself."
    exit 1
  fi
else
	echo "usage: $SCRIPT_NAME (configure|reset|rotate) [options]"
	echo
	echo "configure: create symlinks in '$INSTALL_INTO' and add git config ('--no-git' to skip git config, or '--git-log' for logging)"
	echo "    reset: remove those symlinks and reset git configuration"
	echo "   rotate: rename any old logs in '$LOG_PATH' to something with a timestamp"
  #hidden option: when needed, this is suggested by command 'configure'
  #echo "create_local_bin: must be run with 'sudo'. Makes sure $INSTALL_INTO is created correctly."
	echo
	echo "Installation status:"
	for CMD in $COMMANDS; do
		if [[ -h $INSTALL_INTO/$CMD ]]; then
			echo "- '$CMD' is currently installed"
		else
			echo "- '$CMD' is currently NOT installed"
		fi
	done
  echo
  echo "Script location: ${BASE_DIR}"
fi