install.sh

#!/bin/sh

##    Copyright © 2016-2017 Rowan Thorpe, initially based entirely on a "taskdb"
##    demo-app posted by Joe Bogner at http://picolisp.com/wiki/?taskdb on
##    24 August 2016, and has been developed extensively from there.
##
##    This file is part of Taskwrangle.
##
##    Taskwrangle is free software: you can redistribute it and/or modify
##    it under the terms of the GNU Affero General Public License as published by
##    the Free Software Foundation, either version 3 of the License, or
##    (at your option) any later version.
##
##    Taskwrangle 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 Affero General Public License for more details.
##
##    You should have received a copy of the GNU Affero General Public License
##    along with Taskwrangle.  If not, see <http://www.gnu.org/licenses/>.

set -e

_this="$(readlink -e "${0}")"
_thisdir="$(dirname "${_this}")"
_thisbase="$(basename "${_this}")"

_uninstall=0
_prefix='/usr/local'
_pl_prefix='/usr'
_confdir=''
_libdir=''
_execdir=''
_docdir=''

_derive_conf_dir() {
    if test '/usr' = "${_prefix}"; then
        printf '/etc'
    else
        printf '%s' "${_prefix}/etc"
    fi
}

while test 0 -ne ${#}; do
    case "${1}" in
        -h|--help)
            cat <<EOF
Usage: ${_thisbase} [-u|-p|-c|-l|-e|-d]

 -u    : uninstall                 (default: install)
 -p XX : set prefix to XX          (default: ${_prefix})
 -c XX : set confdir to XX         (default: ${_confdir:-$(_derive_conf_dir)})
 -l XX : set libdir to XX          (default: ${_libdir:-${_prefix}}/lib)
 -e XX : set execdir to XX         (default: ${_execdir:-${_prefix}}/bin)
 -d XX : set docdir to XX          (default: ${_docdir:-${_prefix}}/share/doc/taskwrangle)
 -P XX : set picolisp prefix to XX (default: ${_pl_prefix})
EOF
            exit 0
            ;;
        -u)
            _uninstall=1
            shift
            ;;
        -p)
            _prefix="$(printf '%s\n' "${2}" | sed -r -e '$ s:/+$::')"
            shift 2
            ;;
        -c)
            _confdir="$(printf '%s\n' "${2}" | sed -r -e '$ s:/+$::')"
            shift 2
            ;;
        -l)
            _libdir="$(printf '%s\n' "${2}" | sed -r -e '$ s:/+$::')"
            shift 2
            ;;
        -e)
            _execdir="$(printf '%s\n' "${2}" | sed -r -e '$ s:/+$::')"
            shift 2
            ;;
        -d)
            _docdir="$(printf '%s\n' "${2}" | sed -r -e '$ s:/+$::')"
            shift 2
            ;;
        -P)
            _pl_prefix="$(printf '%s\n' "${2}" | sed -r -e '$ s:/+$::')"
            shift 2
            ;;
        --)
            shift
            break
            ;;
        -*)
            printf 'Unknown arg "%s"\n' "${1}" >&2
            exit 1
            ;;
        *)
            break
            ;;
    esac
done
test -n "${_confdir}" || _confdir="$(_derive_conf_dir)"
test -n "${_libdir}" || _libdir="${_prefix}/lib"
test -n "${_execdir}" || _execdir="${_prefix}/bin"
test -n "${_docdir}" || _docdir="${_prefix}/share/doc/taskwrangle"

if test 1 -eq ${_uninstall}; then
    rm -fv "${_confdir}/taskwrangle.l"
    rm -fv "${_libdir}/libtaskwrangle.l"
    rm -fv "${_execdir}/taskwrangle"
    rm -fv "${_docdir}/TODO"
    rm -fv "${_docdir}/README.md"
    rm -fv "${_docdir}/COPYING"
    rmdir -v "${_docdir}"
else
    _sed_string="
        s:__CONFDIR__:${_confdir}:g
        s:__LIBDIR__:${_libdir}:g
        s:__EXECDIR__:${_execdir}:g
        s:__DOCDIR__:${_docdir}:g
        s:__PREFIX__:${_prefix}:g
        s:__PL_PREFIX__:${_pl_prefix}:g
    "
    _install_sed() {
        _srcpath="${1}"
        _dstpath="${2}"
        _chmod="${3:-u=rw,go=r}"
        shift 2
        _tmppath="$(mktemp)"
        _exists=0
        test -e "${_dstpath}" || _exists=1
        sed -e "${_sed_string}" "${_srcpath}" >"${_tmppath}"
        mkdir -p "$(dirname "${_dstpath}")"
        mv -f "${_tmppath}" "${_dstpath}"
        test 1 -eq $_exists || printf 'removed '\''%s'\''\n' "${_dstpath}"
        printf ''\''%s'\'' -> '\''%s'\''\n' "${_srcpath}" "${_dstpath}" >&2
        rm -f "${_tmppath}"
        chmod "${_chmod}" "${_dstpath}"
    }
    install -v -D -m u=rw,go=r -t "${_docdir}" "${_thisdir}/COPYING" "${_thisdir}/README.md" "${_thisdir}/TODO"
    _install_sed "${_thisdir}/taskwrangle" "${_execdir}/taskwrangle" 'u=rwx,go=rx'
    _install_sed "${_thisdir}/lib/libtaskwrangle.l" "${_libdir}/libtaskwrangle.l"
    _install_sed "${_thisdir}/conf/taskwrangle.l" "${_confdir}/taskwrangle.l"
fi