uninstall

#!/bin/sh
# SPDX-License-Identifier: GPL-3.0-only
#
# This file is part of the denv project: https://github.com/tomeichlersmith/denv
#
# Copyright (C) 2021 denv contributors
#
# denv is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 3
# as published by the Free Software Foundation.
#
# denv is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with denv; if not, see <http://www.gnu.org/licenses/>.

# POSIX
set -o errexit
set -o nounset

# Print usage to stdout.
# Arguments:
#   None
# Outputs:
#   print usage with examples.
show_help() {
  cat << EOF

USAGE:
  uninstall [options]

OPTIONS:
  -p|--prefix : base path where all files were deployed (default /usr/local if root, ~/.local if not)
  -h|--help   : show this message
  -v|--verbose: show more verbosity

EOF
}

prefix=""
verbose=0
dest_path=""

# Parse arguments
while [ "$#" -gt 0 ]; do
  case $1 in
    -h | --help)
      # Call a "show_help" function to display a synopsis, then exit.
      show_help
      exit
      ;;
    -v | --verbose)
      shift
      verbose=1
      ;;
    -p | --prefix)
      if [ -n "$2" ]; then
        prefix="$2"
        shift
        shift
      fi
      ;;
    *) # Default case: If no more options then break out of the loop.
      break ;;
  esac
done

# set verbosity
if [ "${verbose}" -ne 0 ]; then
  set -o xtrace
fi

if  [ -z "${prefix}" ]; then
  prefix="/usr/local"
  # in case we're not root, default to the home directory where
  # the default is for install
  if [ "$(id -u || true)" -ne 0 ]; then
    prefix="${HOME}/.local"
  fi
fi
completion_dest_path="${prefix}/share/bash-completion/completions/"
dest_path="${prefix}/bin"
man_dest_path="${prefix}/share/man/man1"

[ ! -w "${dest_path}" ] && printf >&2 "Cannot write into %s, permission denied.\n" "${dest_path}" && exit 1
[ ! -w "${man_dest_path}" ] && printf >&2 "Cannot write into %s, permission denied.\n" "${man_dest_path}" && exit 1

# uninstall
rm -f "${dest_path}/denv"
rm -f "${dest_path}/_denv_entrypoint"
for file in "${completion_dest_path}/denv"*; do
  rm -f "${file}"
done
for file in "${man_dest_path}/denv"*; do
  rm -f "${file}"
done

printf >&2 "\033[1;31m Thank you for using denv. Uninstall complete.\n\033[0m"