#!/usr/bin/env bash

H=$(head -1 bashrc.head)
T=$(head -1 bashrc.tail)

BASHRC_FILENAME="${HOME}/.bashrc"

HEAD_EXISTS="0"
TAIL_EXISTS="0"

grep --fixed-strings "${H}" "${BASHRC_FILENAME}"
if [ "$?" -eq "0" ]
then
	HEAD_EXISTS="1"
fi

grep --fixed-strings "${T}" "${BASHRC_FILENAME}"
if [ "$?" -eq "0" ]
then
	TAIL_EXISTS="1"
fi


if [ "${HEAD_EXISTS}" -eq "0" ]
then
	cat bashrc.head "${BASHRC_FILENAME}" > "${BASHRC_FILENAME}.in"
	cat "${BASHRC_FILENAME}.in" > "${BASHRC_FILENAME}"
	rm -vf "${BASHRC_FILENAME}.in"
fi

if [ "${TAIL_EXISTS}" -eq "0" ]
then
	cat "${BASHRC_FILENAME}" bashrc.tail > "${BASHRC_FILENAME}.in"
	cat "${BASHRC_FILENAME}.in" > "${BASHRC_FILENAME}"
	rm -vf "${BASHRC_FILENAME}.in"
fi