#!/bin/bash
# Internal helper design to allow helpers to use getopts to manage their arguments
#
# [internal]
#
# example: function my_helper()
# {
# local -A args_array=( [a]=arg1= [b]=arg2= [c]=arg3 )
# local arg1
# local arg2
# local arg3
# ynh_handle_getopts_args "$@"
#
# [...]
# }
# my_helper --arg1 "val1" -b val2 -c
#
# usage: ynh_handle_getopts_args "$@"
# | arg: $@ - Simply "$@" to tranfert all the positionnal arguments to the function
#
# This helper need an array, named "args_array" with all the arguments used by the helper
# that want to use ynh_handle_getopts_args
# Be carreful, this array has to be an associative array, as the following example:
# local -A args_array=( [a]=arg1 [b]=arg2= [c]=arg3 )
# Let's explain this array:
# a, b and c are short options, -a, -b and -c
# arg1, arg2 and arg3 are the long options associated to the previous short ones. --arg1, --arg2 and --arg3
# For each option, a short and long version has to be defined.
# Let's see something more significant
# local -A args_array=( [u]=user [f]=finalpath= [d]=database )
#
# NB: Because we're using 'declare' without -g, the array will be declared as a local variable.
#
# Please keep in mind that the long option will be used as a variable to store the values for this option.
# For the previous example, that means that $finalpath will be fill with the value given as argument for this option.
#
# Also, in the previous example, finalpath has a '=' at the end. That means this option need a value.
# So, the helper has to be call with --finalpath /final/path, --finalpath=/final/path or -f /final/path, the variable $finalpath will get the value /final/path
# If there's many values for an option, -f /final /path, the value will be separated by a ';' $finalpath=/final;/path
# For an option without value, like --user in the example, the helper can be called only with --user or -u. $user will then get the value 1.
#
# To keep a retrocompatibility, a package can still call a helper, using getopts, with positional arguments.
# The "legacy mode" will manage the positional arguments and fill the variable in the same order than they are given in $args_array.
# e.g. for `my_helper "val1" val2`, arg1 will be filled with val1, and arg2 with val2.
#
# Requires YunoHost version 3.2.2 or higher.
ynh_handle_getopts_args() {
# Manage arguments only if there's some provided
set +o xtrace # set +x
if [ $# -ne 0 ]; then
# Store arguments in an array to keep each argument separated
local arguments=("$@")
# For each option in the array, reduce to short options for getopts (e.g. for [u]=user, --user will be -u)
# And built parameters string for getopts
# ${!args_array[@]} is the list of all option_flags in the array (An option_flag is 'u' in [u]=user, user is a value)
local getopts_parameters=""
local option_flag=""
for option_flag in "${!args_array[@]}"; do
# Concatenate each option_flags of the array to build the string of arguments for getopts
# Will looks like 'abcd' for -a -b -c -d
# If the value of an option_flag finish by =, it's an option with additionnal values. (e.g. --user bob or -u bob)
# Check the last character of the value associate to the option_flag
if [ "${args_array[$option_flag]: -1}" = "=" ]; then
# For an option with additionnal values, add a ':' after the letter for getopts.
getopts_parameters="${getopts_parameters}${option_flag}:"
else
getopts_parameters="${getopts_parameters}${option_flag}"
fi
# Check each argument given to the function
local arg=""
# ${#arguments[@]} is the size of the array
for arg in $(seq 0 $((${#arguments[@]} - 1))); do
# Escape options' values starting with -. Otherwise the - will be considered as another option.
arguments[arg]="${arguments[arg]//--${args_array[$option_flag]}-/--${args_array[$option_flag]}\\TOBEREMOVED\\-}"
# And replace long option (value of the option_flag) by the short option, the option_flag itself
# (e.g. for [u]=user, --user will be -u)
# Replace long option with = (match the beginning of the argument)
arguments[arg]="$(echo "${arguments[arg]}" | sed "s/^--${args_array[$option_flag]}/-${option_flag} /")"
# And long option without = (match the whole line)
arguments[arg]="$(echo "${arguments[arg]}" | sed "s/^--${args_array[$option_flag]%=}$/-${option_flag} /")"
done
done
# Read and parse all the arguments
# Use a function here, to use standart arguments $@ and be able to use shift.
parse_arg() {
# Read all arguments, until no arguments are left
while [ $# -ne 0 ]; do
# Initialize the index of getopts
OPTIND=1
# Parse with getopts only if the argument begin by -, that means the argument is an option
# getopts will fill $parameter with the letter of the option it has read.
local parameter=""
getopts ":$getopts_parameters" parameter || true
if [ "$parameter" = "?" ]; then
ynh_die --message="Invalid argument: -${OPTARG:-}"
elif [ "$parameter" = ":" ]; then
ynh_die --message="-$OPTARG parameter requires an argument."
else
local shift_value=1
# Use the long option, corresponding to the short option read by getopts, as a variable
# (e.g. for [u]=user, 'user' will be used as a variable)
# Also, remove '=' at the end of the long option
# The variable name will be stored in 'option_var'
local option_var="${args_array[$parameter]%=}"
# If this option doesn't take values
# if there's a '=' at the end of the long option name, this option takes values
if [ "${args_array[$parameter]: -1}" != "=" ]; then
# 'eval ${option_var}' will use the content of 'option_var'
eval ${option_var}=1
else
# Read all other arguments to find multiple value for this option.
# Load args in a array
local all_args=("$@")
# If the first argument is longer than 2 characters,
# There's a value attached to the option, in the same array cell
if [ ${#all_args[0]} -gt 2 ]; then
# Remove the option and the space, so keep only the value itself.
all_args[0]="${all_args[0]#-${parameter} }"
# At this point, if all_args[0] start with "-", then the argument is not well formed
if [ "${all_args[0]:0:1}" == "-" ]; then
ynh_die --message="Argument \"${all_args[0]}\" not valid! Did you use a single \"-\" instead of two?"
fi
# Reduce the value of shift, because the option has been removed manually
shift_value=$((shift_value - 1))
fi
# Declare the content of option_var as a variable.
eval ${option_var}=""
# Then read the array value per value
local i
for i in $(seq 0 $((${#all_args[@]} - 1))); do
# If this argument is an option, end here.
if [ "${all_args[$i]:0:1}" == "-" ]; then
# Ignore the first value of the array, which is the option itself
if [ "$i" -ne 0 ]; then
break
fi
else
# Ignore empty parameters
if [ -n "${all_args[$i]}" ]; then
# Else, add this value to this option
# Each value will be separated by ';'
if [ -n "${!option_var}" ]; then
# If there's already another value for this option, add a ; before adding the new value
eval ${option_var}+="\;"
fi
# Remove the \ that escape - at beginning of values.
all_args[i]="${all_args[i]//\\TOBEREMOVED\\/}"
# For the record.
# We're using eval here to get the content of the variable stored itself as simple text in $option_var...
# Other ways to get that content would be to use either ${!option_var} or declare -g ${option_var}
# But... ${!option_var} can't be used as left part of an assignation.
# declare -g ${option_var} will create a local variable (despite -g !) and will not be available for the helper itself.
# So... Stop fucking arguing each time that eval is evil... Go find an other working solution if you can find one!
eval ${option_var}+='"${all_args[$i]}"'
fi
shift_value=$((shift_value + 1))
fi
done
fi
fi
# Shift the parameter and its argument(s)
shift $shift_value
done
}
# LEGACY MODE
# Check if there's getopts arguments
if [ "${arguments[0]:0:1}" != "-" ]; then
# If not, enter in legacy mode and manage the arguments as positionnal ones..
# Dot not echo, to prevent to go through a helper output. But print only in the log.
set -x
echo "! Helper used in legacy mode !" >/dev/null
set +x
local i
for i in $(seq 0 $((${#arguments[@]} - 1))); do
# Try to use legacy_args as a list of option_flag of the array args_array
# Otherwise, fallback to getopts_parameters to get the option_flag. But an associative arrays isn't always sorted in the correct order...
# Remove all ':' in getopts_parameters
getopts_parameters=${legacy_args:-${getopts_parameters//:/}}
# Get the option_flag from getopts_parameters, by using the option_flag according to the position of the argument.
option_flag=${getopts_parameters:$i:1}
if [ -z "$option_flag" ]; then
ynh_print_warn --message="Too many arguments ! \"${arguments[$i]}\" will be ignored."
continue
fi
# Use the long option, corresponding to the option_flag, as a variable
# (e.g. for [u]=user, 'user' will be used as a variable)
# Also, remove '=' at the end of the long option
# The variable name will be stored in 'option_var'
local option_var="${args_array[$option_flag]%=}"
# Store each value given as argument in the corresponding variable
# The values will be stored in the same order than $args_array
eval ${option_var}+='"${arguments[$i]}"'
done
unset legacy_args
else
# END LEGACY MODE
# Call parse_arg and pass the modified list of args as an array of arguments.
parse_arg "${arguments[@]}"
fi
fi
set -o xtrace # set -x
}