#!/bin/bash
##
# argparser – command line argument parser library
#
# Copyright © 2013 Mattias Andrée (maandree@member.fsf.org)
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This library 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 this library. If not, see <http://www.gnu.org/licenses/>.
##
# I could make maps or Bash, but I really prefer not to, therefore
# /tmp/argparser_$$ is used instead to let the fs constructor sets.
# :int Option takes no arguments
args_ARGUMENTLESS=0
# :int Option takes one argument per instance
args_ARGUMENTED=1
# :int Option consumes all following arguments
args_VARIADIC=2
# Constructor.
# The short description is printed on same line as the program name
#
# @param $1:str Short, single-line, description of the program
# @param $2:str Formated, multi-line, usage text, empty for none
# @param $3:str Long, multi-line, description of the program, empty for none
# @param $4:str The name of the program, empty for automatic
# @param $5:str Output channel, by fd
function args_init
{
test "$TERM" = linux
args_linuxvt=$?
args_program="$4"
if [ "$args_program" = "" ]; then
args_program="$0"
fi
args_description="$1"
args_usage="$2"
args_longdescription="$3"
args_options=()
args_opts_alts=()
args_opts="/tmp/argparser_$$/opts"
args_optmap="/tmp/argparser_$$/optmap"
mkdir -p "${args_opts}"
mkdir -p "${args_optmap}"
args_out="$5"
if [ "$args_out" = "" ]; then
args_out="1"
fi
args_out="$(realpath "/proc/$$/fd/${args_out}")"
args_files=()
}
# Disposes of resources, you really should be doing this when you are done with this module
#
# @param $1:int The ID of process that alloceted the resources, empty for the current process
function args_dispose
{
local pid=$1
if [ "$pid" = "" ]; then
pid=$$
fi
rm -r "/tmp/argparser_${pid}"
}
# Gets the name of the parent process
#
# @param $1:int The number of parents to walk, 0 for self, and 1 for direct parent
# @return :str The name of the parent process, empty if not found
# @exit 0 of success, 1 if not found
function args_parent_name
{
local pid=$$ lvl=$1 found=0 line arg
while (( $lvl > 1 )) && [ $found = 0 ]; do
while read line; do
if [ "${line:5}" = "PPid:" ]; then
line="${line:5}"
line="${line/$(echo -e \\t)/}"
pid="${line/ /}"
(( lvl-- ))
found=1
break
fi
done < "/proc/${pid}/cmdline"
done
if [ $found = 0 ]; then
return 1
fi
if [ -e "/proc/${pid}/cmdline" ]; then
for arg in "$(cat /proc/${pid}/cmdline | sed -e 's/\x00/\n/g')" ; do
echo "$arg"
return 0
done
fi
return 1
}
# Maps up options that are alternatives to the first alternative for each option
function args_support_alternatives
{
local alt
for alt in "$(ls "${args_optmap}")"; do
ln -s "${args_opts}/$(head -n 1 < "${args_optmap}/${alt}")" "${args_opts}/${alt}"
done
}
# Checks for option conflicts
#
# @param $@:(str) Exclusive options
# @exit Whether at most one exclusive option was used
function args_test_exclusiveness
{
local used used_use used_std opt msg i=0 n
used=()
opts_use=()
opts_std=()
for opt in "$@"; do
echo "$opt"
done > "/tmp/argparser_$$/tmp"
comm -12 <(ls "${args_opts}" | sort) <(cat "/tmp/argparser_$$/tmp" | sort) |
while read opt; do
if [ -e "${args_opts}/${opt}" ]; then
opts_use+=( "${opt}" )
opts_std+=( "$(head -n 1 < ${args_optmap}/${opt})" )
fi
done
rm "/tmp/argparser_$$/tmp"
n=${#used[@]}
if (( $n > 1 )); then
msg="${args_program}: conflicting options:"
while (( $i < $n )); do
if [ "${used_use[$i]}" = "${used_std[$i]}" ]; then
msg="${msg} ${used_use[$i]}"
else
msg="${msg} ${used_use[$i]}(${used_std[$i]})"
fi
(( i++ ))
done
echo "$msg" > "${args_out}"
return 1
fi
return 0
}
# Checks for out of context option usage
#
# @param @:(str) Allowed options
# @exit Whether only allowed options was used
function args_test_allowed
{
local opt msg std rc=0
for opt in "$@"; do
echo "$opt"
done > "/tmp/argparser_$$/tmp"
comm -23 <(ls "${args_opts}" | sort) <(cat "/tmp/argparser_$$/tmp" | sort) |
while read opt; do
if [ -e "${args_opts}/${opt}" ]; then
msg="${args_program}: option used out of context: ${opt}"
std="$(head -n 1 < "${args_optmap}/${opt}")"
if [ ! "${opt}" = "${std}" ]; then
msg="${msg}(${std})"
fi
echo "$msg" > "${args_out}"
rc=1
fi
done
rm "/tmp/argparser_$$/tmp"
return $rc
}
# Checks the correctness of the number of used non-option arguments
#
# @param $1:int The minimum number of files
# @param $2:int? The maximum number of files, empty for unlimited
# @exit Whether the usage was correct
function args_test_files
{
local min=$1 max=$2 n=${#args_files[@]}
if [ "$max" = "" ]; then
max=$n
fi
(( $min <= $n )) && (( $n <= $max ))
return $?
}
# Add option that takes no arguments
#
# @param $1:int The default argument's index
# @param $2:str Short description, use empty to hide the option
# @param ...:(str) Option names
function args_add_argumentless
{
local default="$1" help="$2" std alts alt
shift 2
args_options+=( ${args_ARGUMENTLESS} "" "${help}" ${#args_opts_alts[@]} $# )
args_opts_alts+=( "$@" )
alts=( "$@" )
std="${alts[$default]}"
for alt in "${alts[@]}"; do
echo "$std" > "${args_optmap}/${alt}"
echo ${args_ARGUMENTLESS} >> "${args_optmap}/${alt}"
done
}
# Add option that takes one argument
#
# @param $1:int The default argument's index
# @param $2:str The name of the takes argument, one word
# @param $3:str Short description, use empty to hide the option
# @param ...:(str) Option names
function args_add_argumented
{
local default="$1" arg="$2" help="$3" std alts alt
shift 3
if [ "${arg}" = "" ]; then
arg="ARG"
fi
args_options+=( ${args_ARGUMENTED} "${arg}" "${help}" ${#args_opts_alts[@]} $# )
args_opts_alts+=( "$@" )
alts=( "$@" )
std="${alts[$default]}"
for alt in "${alts[@]}"; do
echo "$std" > "${args_optmap}/${alt}"
echo ${args_ARGUMENTED} >> "${args_optmap}/${alt}"
done
}
# Add option that takes all following arguments
#
# @param $1:int The default argument's index
# @param $2:str The name of the takes argument, one word
# @param $3:str Short description, use empty to hide the option
# @param ...:(str) Option names
function args_add_variadic
{
local default="$1" arg="$2" help="$3" std alts alt
shift 3
if [ "${arg}" = "" ]; then
arg="ARG"
fi
args_options+=( ${args_VARIADIC} "${arg}" "${help}" ${#args_opts_alts[@]} $# )
args_opts_alts+=( "$@" )
alts=( "$@" )
std="${alts[$default]}"
for alt in "${alts[@]}"; do
echo "$std" > "${args_optmap}/${alt}"
echo ${args_VARIADIC} >> "${args_optmap}/${alt}"
done
}
