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obackup/dev/tests/shunit2/lib/shflags
deajan 0a17c17c28 Updated shunit2 test framework
2018-09-30 16:31:34 +02:00

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# vim:et:ft=sh:sts=2:sw=2
#
# Copyright 2008-2017 Kate Ward. All Rights Reserved.
# Released under the Apache License 2.0 license.
# http://www.apache.org/licenses/LICENSE-2.0
#
# shFlags -- Advanced command-line flag library for Unix shell scripts.
# https://github.com/kward/shflags
#
# Author: kate.ward@forestent.com (Kate Ward)
#
# This module implements something like the gflags library available
# from https://github.com/gflags/gflags.
#
# FLAG TYPES: This is a list of the DEFINE_*'s that you can do. All flags take
# a name, default value, help-string, and optional 'short' name (one-letter
# name). Some flags have other arguments, which are described with the flag.
#
# DEFINE_string: takes any input, and interprets it as a string.
#
# DEFINE_boolean: does not take any arguments. Say --myflag to set
# FLAGS_myflag to true, or --nomyflag to set FLAGS_myflag to false. For short
# flags, passing the flag on the command-line negates the default value, i.e.
# if the default is true, passing the flag sets the value to false.
#
# DEFINE_float: takes an input and interprets it as a floating point number. As
# shell does not support floats per-se, the input is merely validated as
# being a valid floating point value.
#
# DEFINE_integer: takes an input and interprets it as an integer.
#
# SPECIAL FLAGS: There are a few flags that have special meaning:
# --help (or -?) prints a list of all the flags in a human-readable fashion
# --flagfile=foo read flags from foo. (not implemented yet)
# -- as in getopt(), terminates flag-processing
#
# EXAMPLE USAGE:
#
# -- begin hello.sh --
# #! /bin/sh
# . ./shflags
# DEFINE_string name 'world' "somebody's name" n
# FLAGS "$@" || exit $?
# eval set -- "${FLAGS_ARGV}"
# echo "Hello, ${FLAGS_name}."
# -- end hello.sh --
#
# $ ./hello.sh -n Kate
# Hello, Kate.
#
# CUSTOMIZABLE BEHAVIOR:
#
# A script can override the default 'getopt' command by providing the path to
# an alternate implementation by defining the FLAGS_GETOPT_CMD variable.
#
# NOTES:
#
# * Not all systems include a getopt version that supports long flags. On these
# systems, only short flags are recognized.
#==============================================================================
# shFlags
#
# Shared attributes:
# flags_error: last error message
# flags_output: last function output (rarely valid)
# flags_return: last return value
#
# __flags_longNames: list of long names for all flags
# __flags_shortNames: list of short names for all flags
# __flags_boolNames: list of boolean flag names
#
# __flags_opts: options parsed by getopt
#
# Per-flag attributes:
# FLAGS_<flag_name>: contains value of flag named 'flag_name'
# __flags_<flag_name>_default: the default flag value
# __flags_<flag_name>_help: the flag help string
# __flags_<flag_name>_short: the flag short name
# __flags_<flag_name>_type: the flag type
#
# Notes:
# - lists of strings are space separated, and a null value is the '~' char.
#
### ShellCheck (http://www.shellcheck.net/)
# $() are not fully portable (POSIX != portable).
# shellcheck disable=SC2006
# [ p -a q ] are well defined enough (vs [ p ] && [ q ]).
# shellcheck disable=SC2166
# Return if FLAGS already loaded.
[ -n "${FLAGS_VERSION:-}" ] && return 0
FLAGS_VERSION='1.2.3pre'
# Return values that scripts can use.
FLAGS_TRUE=0
FLAGS_FALSE=1
FLAGS_ERROR=2
# Logging levels.
FLAGS_LEVEL_DEBUG=0
FLAGS_LEVEL_INFO=1
FLAGS_LEVEL_WARN=2
FLAGS_LEVEL_ERROR=3
FLAGS_LEVEL_FATAL=4
__FLAGS_LEVEL_DEFAULT=${FLAGS_LEVEL_WARN}
# Determine some reasonable command defaults.
__FLAGS_EXPR_CMD='expr --'
__FLAGS_UNAME_S=`uname -s`
if [ "${__FLAGS_UNAME_S}" = 'BSD' ]; then
__FLAGS_EXPR_CMD='gexpr --'
else
_flags_output_=`${__FLAGS_EXPR_CMD} 2>&1`
if [ $? -eq ${FLAGS_TRUE} -a "${_flags_output_}" = '--' ]; then
# We are likely running inside BusyBox.
__FLAGS_EXPR_CMD='expr'
fi
unset _flags_output_
fi
# Commands a user can override if desired.
FLAGS_EXPR_CMD=${FLAGS_EXPR_CMD:-${__FLAGS_EXPR_CMD}}
FLAGS_GETOPT_CMD=${FLAGS_GETOPT_CMD:-getopt}
# Specific shell checks.
if [ -n "${ZSH_VERSION:-}" ]; then
setopt |grep "^shwordsplit$" >/dev/null
if [ $? -ne ${FLAGS_TRUE} ]; then
_flags_fatal 'zsh shwordsplit option is required for proper zsh operation'
fi
if [ -z "${FLAGS_PARENT:-}" ]; then
_flags_fatal "zsh does not pass \$0 through properly. please declare' \
\"FLAGS_PARENT=\$0\" before calling shFlags"
fi
fi
# Can we use built-ins?
( echo "${FLAGS_TRUE#0}"; ) >/dev/null 2>&1
if [ $? -eq ${FLAGS_TRUE} ]; then
__FLAGS_USE_BUILTIN=${FLAGS_TRUE}
else
__FLAGS_USE_BUILTIN=${FLAGS_FALSE}
fi
#
# Constants.
#
# Reserved flag names.
__FLAGS_RESERVED_LIST=' ARGC ARGV ERROR FALSE GETOPT_CMD HELP PARENT TRUE '
__FLAGS_RESERVED_LIST="${__FLAGS_RESERVED_LIST} VERSION "
# Determined getopt version (standard or enhanced).
__FLAGS_GETOPT_VERS_STD=0
__FLAGS_GETOPT_VERS_ENH=1
# shellcheck disable=SC2120
_flags_getopt_vers() {
_flags_getopt_cmd_=${1:-${FLAGS_GETOPT_CMD}}
case "`${_flags_getopt_cmd_} -lfoo '' --foo 2>&1`" in
' -- --foo') echo ${__FLAGS_GETOPT_VERS_STD} ;;
' --foo --') echo ${__FLAGS_GETOPT_VERS_ENH} ;;
# Unrecognized output. Assuming standard getopt version.
*) echo ${__FLAGS_GETOPT_VERS_STD} ;;
esac
unset _flags_getopt_cmd_
}
# shellcheck disable=SC2119
__FLAGS_GETOPT_VERS=`_flags_getopt_vers`
# getopt optstring lengths
__FLAGS_OPTSTR_SHORT=0
__FLAGS_OPTSTR_LONG=1
__FLAGS_NULL='~'
# Flag info strings.
__FLAGS_INFO_DEFAULT='default'
__FLAGS_INFO_HELP='help'
__FLAGS_INFO_SHORT='short'
__FLAGS_INFO_TYPE='type'
# Flag lengths.
__FLAGS_LEN_SHORT=0
__FLAGS_LEN_LONG=1
# Flag types.
__FLAGS_TYPE_NONE=0
__FLAGS_TYPE_BOOLEAN=1
__FLAGS_TYPE_FLOAT=2
__FLAGS_TYPE_INTEGER=3
__FLAGS_TYPE_STRING=4
# Set the constants readonly.
__flags_constants=`set |awk -F= '/^FLAGS_/ || /^__FLAGS_/ {print $1}'`
for __flags_const in ${__flags_constants}; do
# Skip certain flags.
case ${__flags_const} in
FLAGS_HELP) continue ;;
FLAGS_PARENT) continue ;;
esac
# Set flag readonly.
if [ -z "${ZSH_VERSION:-}" ]; then
readonly "${__flags_const}"
continue
fi
case ${ZSH_VERSION} in
[123].*) readonly "${__flags_const}" ;;
*) readonly -g "${__flags_const}" ;; # Declare readonly constants globally.
esac
done
unset __flags_const __flags_constants
#
# Internal variables.
#
# Space separated lists.
__flags_boolNames=' ' # Boolean flag names.
__flags_longNames=' ' # Long flag names.
__flags_shortNames=' ' # Short flag names.
__flags_definedNames=' ' # Defined flag names (used for validation).
__flags_columns='' # Screen width in columns.
__flags_level=0 # Default logging level.
__flags_opts='' # Temporary storage for parsed getopt flags.
#------------------------------------------------------------------------------
# Private functions.
#
# Logging functions.
_flags_debug() {
[ ${__flags_level} -le ${FLAGS_LEVEL_DEBUG} ] || return
echo "flags:DEBUG $*" >&2
}
_flags_info() {
[ ${__flags_level} -le ${FLAGS_LEVEL_INFO} ] || return
echo "flags:INFO $*" >&2
}
_flags_warn() {
[ ${__flags_level} -le ${FLAGS_LEVEL_WARN} ] || return
echo "flags:WARN $*" >&2
}
_flags_error() {
[ ${__flags_level} -le ${FLAGS_LEVEL_ERROR} ] || return
echo "flags:ERROR $*" >&2
}
_flags_fatal() {
[ ${__flags_level} -le ${FLAGS_LEVEL_FATAL} ] || return
echo "flags:FATAL $*" >&2
exit ${FLAGS_ERROR}
}
# Get the logging level.
flags_loggingLevel() { echo ${__flags_level}; }
# Set the logging level.
#
# Args:
# _flags_level_: integer: new logging level
# Returns:
# nothing
flags_setLoggingLevel() {
[ $# -ne 1 ] && _flags_fatal "flags_setLevel(): logging level missing"
_flags_level_=$1
[ "${_flags_level_}" -ge "${FLAGS_LEVEL_DEBUG}" \
-a "${_flags_level_}" -le "${FLAGS_LEVEL_FATAL}" ] \
|| _flags_fatal "Invalid logging level '${_flags_level_}' specified."
__flags_level=$1
unset _flags_level_
}
# Define a flag.
#
# Calling this function will define the following info variables for the
# specified flag:
# FLAGS_flagname - the name for this flag (based upon the long flag name)
# __flags_<flag_name>_default - the default value
# __flags_flagname_help - the help string
# __flags_flagname_short - the single letter alias
# __flags_flagname_type - the type of flag (one of __FLAGS_TYPE_*)
#
# Args:
# _flags_type_: integer: internal type of flag (__FLAGS_TYPE_*)
# _flags_name_: string: long flag name
# _flags_default_: default flag value
# _flags_help_: string: help string
# _flags_short_: string: (optional) short flag name
# Returns:
# integer: success of operation, or error
_flags_define() {
if [ $# -lt 4 ]; then
flags_error='DEFINE error: too few arguments'
flags_return=${FLAGS_ERROR}
_flags_error "${flags_error}"
return ${flags_return}
fi
_flags_type_=$1
_flags_name_=$2
_flags_default_=$3
_flags_help_=${4:-§} # Special value '§' indicates no help string provided.
_flags_short_=${5:-${__FLAGS_NULL}}
_flags_debug "type:${_flags_type_} name:${_flags_name_}" \
"default:'${_flags_default_}' help:'${_flags_help_}'" \
"short:${_flags_short_}"
_flags_return_=${FLAGS_TRUE}
_flags_usName_="`_flags_underscoreName "${_flags_name_}"`"
# Check whether the flag name is reserved.
_flags_itemInList "${_flags_usName_}" "${__FLAGS_RESERVED_LIST}"
if [ $? -eq ${FLAGS_TRUE} ]; then
flags_error="flag name (${_flags_name_}) is reserved"
_flags_return_=${FLAGS_ERROR}
fi
# Require short option for getopt that don't support long options.
if [ ${_flags_return_} -eq ${FLAGS_TRUE} \
-a "${__FLAGS_GETOPT_VERS}" -ne "${__FLAGS_GETOPT_VERS_ENH}" \
-a "${_flags_short_}" = "${__FLAGS_NULL}" ]
then
flags_error="short flag required for (${_flags_name_}) on this platform"
_flags_return_=${FLAGS_ERROR}
fi
# Check for existing long name definition.
if [ ${_flags_return_} -eq ${FLAGS_TRUE} ]; then
if _flags_itemInList "${_flags_usName_}" "${__flags_definedNames}"; then
flags_error="definition for ([no]${_flags_name_}) already exists"
_flags_warn "${flags_error}"
_flags_return_=${FLAGS_FALSE}
fi
fi
# Check for existing short name definition.
if [ ${_flags_return_} -eq ${FLAGS_TRUE} \
-a "${_flags_short_}" != "${__FLAGS_NULL}" ]
then
if _flags_itemInList "${_flags_short_}" "${__flags_shortNames}"; then
flags_error="flag short name (${_flags_short_}) already defined"
_flags_warn "${flags_error}"
_flags_return_=${FLAGS_FALSE}
fi
fi
# Handle default value. Note, on several occasions the 'if' portion of an
# if/then/else contains just a ':' which does nothing. A binary reversal via
# '!' is not done because it does not work on all shells.
if [ ${_flags_return_} -eq ${FLAGS_TRUE} ]; then
case ${_flags_type_} in
${__FLAGS_TYPE_BOOLEAN})
if _flags_validBool "${_flags_default_}"; then
case ${_flags_default_} in
true|t|0) _flags_default_=${FLAGS_TRUE} ;;
false|f|1) _flags_default_=${FLAGS_FALSE} ;;
esac
else
flags_error="invalid default flag value '${_flags_default_}'"
_flags_return_=${FLAGS_ERROR}
fi
;;
${__FLAGS_TYPE_FLOAT})
if _flags_validFloat "${_flags_default_}"; then
:
else
flags_error="invalid default flag value '${_flags_default_}'"
_flags_return_=${FLAGS_ERROR}
fi
;;
${__FLAGS_TYPE_INTEGER})
if _flags_validInt "${_flags_default_}"; then
:
else
flags_error="invalid default flag value '${_flags_default_}'"
_flags_return_=${FLAGS_ERROR}
fi
;;
${__FLAGS_TYPE_STRING}) ;; # Everything in shell is a valid string.
*)
flags_error="unrecognized flag type '${_flags_type_}'"
_flags_return_=${FLAGS_ERROR}
;;
esac
fi
if [ ${_flags_return_} -eq ${FLAGS_TRUE} ]; then
# Store flag information.
eval "FLAGS_${_flags_usName_}='${_flags_default_}'"
eval "__flags_${_flags_usName_}_${__FLAGS_INFO_TYPE}=${_flags_type_}"
eval "__flags_${_flags_usName_}_${__FLAGS_INFO_DEFAULT}=\
\"${_flags_default_}\""
eval "__flags_${_flags_usName_}_${__FLAGS_INFO_HELP}=\"${_flags_help_}\""
eval "__flags_${_flags_usName_}_${__FLAGS_INFO_SHORT}='${_flags_short_}'"
# append flag names to name lists
__flags_shortNames="${__flags_shortNames}${_flags_short_} "
__flags_longNames="${__flags_longNames}${_flags_name_} "
[ "${_flags_type_}" -eq "${__FLAGS_TYPE_BOOLEAN}" ] && \
__flags_boolNames="${__flags_boolNames}no${_flags_name_} "
# Append flag names to defined names for later validation checks.
__flags_definedNames="${__flags_definedNames}${_flags_usName_} "
[ "${_flags_type_}" -eq "${__FLAGS_TYPE_BOOLEAN}" ] && \
__flags_definedNames="${__flags_definedNames}no${_flags_usName_} "
fi
flags_return=${_flags_return_}
unset _flags_default_ _flags_help_ _flags_name_ _flags_return_ \
_flags_short_ _flags_type_ _flags_usName_
[ ${flags_return} -eq ${FLAGS_ERROR} ] && _flags_error "${flags_error}"
return ${flags_return}
}
# Underscore a flag name by replacing dashes with underscores.
#
# Args:
# unnamed: string: log flag name
# Output:
# string: underscored name
_flags_underscoreName() {
echo "$1" |tr '-' '_'
}
# Return valid getopt options using currently defined list of long options.
#
# This function builds a proper getopt option string for short (and long)
# options, using the current list of long options for reference.
#
# Args:
# _flags_optStr: integer: option string type (__FLAGS_OPTSTR_*)
# Output:
# string: generated option string for getopt
# Returns:
# boolean: success of operation (always returns True)
_flags_genOptStr() {
_flags_optStrType_=$1
_flags_opts_=''
for _flags_name_ in ${__flags_longNames}; do
_flags_usName_="`_flags_underscoreName "${_flags_name_}"`"
_flags_type_="`_flags_getFlagInfo "${_flags_usName_}" "${__FLAGS_INFO_TYPE}"`"
[ $? -eq ${FLAGS_TRUE} ] || _flags_fatal 'call to _flags_type_ failed'
case ${_flags_optStrType_} in
${__FLAGS_OPTSTR_SHORT})
_flags_shortName_="`_flags_getFlagInfo \
"${_flags_usName_}" "${__FLAGS_INFO_SHORT}"`"
if [ "${_flags_shortName_}" != "${__FLAGS_NULL}" ]; then
_flags_opts_="${_flags_opts_}${_flags_shortName_}"
# getopt needs a trailing ':' to indicate a required argument.
[ "${_flags_type_}" -ne "${__FLAGS_TYPE_BOOLEAN}" ] && \
_flags_opts_="${_flags_opts_}:"
fi
;;
${__FLAGS_OPTSTR_LONG})
_flags_opts_="${_flags_opts_:+${_flags_opts_},}${_flags_name_}"
# getopt needs a trailing ':' to indicate a required argument
[ "${_flags_type_}" -ne "${__FLAGS_TYPE_BOOLEAN}" ] && \
_flags_opts_="${_flags_opts_}:"
;;
esac
done
echo "${_flags_opts_}"
unset _flags_name_ _flags_opts_ _flags_optStrType_ _flags_shortName_ \
_flags_type_ _flags_usName_
return ${FLAGS_TRUE}
}
# Returns flag details based on a flag name and flag info.
#
# Args:
# string: underscored flag name
# string: flag info (see the _flags_define function for valid info types)
# Output:
# string: value of dereferenced flag variable
# Returns:
# integer: one of FLAGS_{TRUE|FALSE|ERROR}
_flags_getFlagInfo() {
# Note: adding gFI to variable names to prevent naming conflicts with calling
# functions
_flags_gFI_usName_=$1
_flags_gFI_info_=$2
# Example: given argument usName (underscored flag name) of 'my_flag', and
# argument info of 'help', set the _flags_infoValue_ variable to the value of
# ${__flags_my_flag_help}, and see if it is non-empty.
_flags_infoVar_="__flags_${_flags_gFI_usName_}_${_flags_gFI_info_}"
_flags_strToEval_="_flags_infoValue_=\"\${${_flags_infoVar_}:-}\""
eval "${_flags_strToEval_}"
if [ -n "${_flags_infoValue_}" ]; then
# Special value '§' indicates no help string provided.
[ "${_flags_gFI_info_}" = ${__FLAGS_INFO_HELP} \
-a "${_flags_infoValue_}" = '§' ] && _flags_infoValue_=''
flags_return=${FLAGS_TRUE}
else
# See if the _flags_gFI_usName_ variable is a string as strings can be
# empty...
# Note: the DRY principle would say to have this function call itself for
# the next three lines, but doing so results in an infinite loop as an
# invalid _flags_name_ will also not have the associated _type variable.
# Because it doesn't (it will evaluate to an empty string) the logic will
# try to find the _type variable of the _type variable, and so on. Not so
# good ;-)
#
# Example cont.: set the _flags_typeValue_ variable to the value of
# ${__flags_my_flag_type}, and see if it equals '4'.
_flags_typeVar_="__flags_${_flags_gFI_usName_}_${__FLAGS_INFO_TYPE}"
_flags_strToEval_="_flags_typeValue_=\"\${${_flags_typeVar_}:-}\""
eval "${_flags_strToEval_}"
# shellcheck disable=SC2154
if [ "${_flags_typeValue_}" = "${__FLAGS_TYPE_STRING}" ]; then
flags_return=${FLAGS_TRUE}
else
flags_return=${FLAGS_ERROR}
flags_error="missing flag info variable (${_flags_infoVar_})"
fi
fi
echo "${_flags_infoValue_}"
unset _flags_gFI_usName_ _flags_gfI_info_ _flags_infoValue_ _flags_infoVar_ \
_flags_strToEval_ _flags_typeValue_ _flags_typeVar_
[ ${flags_return} -eq ${FLAGS_ERROR} ] && _flags_error "${flags_error}"
return ${flags_return}
}
# Check for presence of item in a list.
#
# Passed a string (e.g. 'abc'), this function will determine if the string is
# present in the list of strings (e.g. ' foo bar abc ').
#
# Args:
# _flags_str_: string: string to search for in a list of strings
# unnamed: list: list of strings
# Returns:
# boolean: true if item is in the list
_flags_itemInList() {
_flags_str_=$1
shift
case " ${*:-} " in
*\ ${_flags_str_}\ *) flags_return=${FLAGS_TRUE} ;;
*) flags_return=${FLAGS_FALSE} ;;
esac
unset _flags_str_
return ${flags_return}
}
# Returns the width of the current screen.
#
# Output:
# integer: width in columns of the current screen.
_flags_columns() {
if [ -z "${__flags_columns}" ]; then
if eval stty size >/dev/null 2>&1; then
# stty size worked :-)
# shellcheck disable=SC2046
set -- `stty size`
__flags_columns="${2:-}"
fi
fi
if [ -z "${__flags_columns}" ]; then
if eval tput cols >/dev/null 2>&1; then
# shellcheck disable=SC2046
set -- `tput cols`
__flags_columns="${1:-}"
fi
fi
echo "${__flags_columns:-80}"
}
# Validate a boolean.
#
# Args:
# _flags__bool: boolean: value to validate
# Returns:
# bool: true if the value is a valid boolean
_flags_validBool() {
_flags_bool_=$1
flags_return=${FLAGS_TRUE}
case "${_flags_bool_}" in
true|t|0) ;;
false|f|1) ;;
*) flags_return=${FLAGS_FALSE} ;;
esac
unset _flags_bool_
return ${flags_return}
}
# Validate a float.
#
# Args:
# _flags_float_: float: value to validate
# Returns:
# bool: true if the value is a valid integer
_flags_validFloat() {
flags_return=${FLAGS_FALSE}
[ -n "$1" ] || return ${flags_return}
_flags_float_=$1
if _flags_validInt "${_flags_float_}"; then
flags_return=${FLAGS_TRUE}
elif _flags_useBuiltin; then
_flags_float_whole_=${_flags_float_%.*}
_flags_float_fraction_=${_flags_float_#*.}
if _flags_validInt "${_flags_float_whole_:-0}" -a \
_flags_validInt "${_flags_float_fraction_}"; then
flags_return=${FLAGS_TRUE}
fi
unset _flags_float_whole_ _flags_float_fraction_
else
flags_return=${FLAGS_TRUE}
case ${_flags_float_} in
-*) # Negative floats.
_flags_test_=`${FLAGS_EXPR_CMD} "${_flags_float_}" :\
'\(-[0-9]*\.[0-9]*\)'`
;;
*) # Positive floats.
_flags_test_=`${FLAGS_EXPR_CMD} "${_flags_float_}" :\
'\([0-9]*\.[0-9]*\)'`
;;
esac
[ "${_flags_test_}" != "${_flags_float_}" ] && flags_return=${FLAGS_FALSE}
unset _flags_test_
fi
unset _flags_float_ _flags_float_whole_ _flags_float_fraction_
return ${flags_return}
}
# Validate an integer.
#
# Args:
# _flags_int_: integer: value to validate
# Returns:
# bool: true if the value is a valid integer
_flags_validInt() {
flags_return=${FLAGS_FALSE}
[ -n "$1" ] || return ${flags_return}
_flags_int_=$1
case ${_flags_int_} in
-*.*) ;; # Ignore negative floats (we'll invalidate them later).
-*) # Strip possible leading negative sign.
if _flags_useBuiltin; then
_flags_int_=${_flags_int_#-}
else
_flags_int_=`${FLAGS_EXPR_CMD} "${_flags_int_}" : '-\([0-9][0-9]*\)'`
fi
;;
esac
case ${_flags_int_} in
*[!0-9]*) flags_return=${FLAGS_FALSE} ;;
*) flags_return=${FLAGS_TRUE} ;;
esac
unset _flags_int_
return ${flags_return}
}
# Parse command-line options using the standard getopt.
#
# Note: the flag options are passed around in the global __flags_opts so that
# the formatting is not lost due to shell parsing and such.
#
# Args:
# @: varies: command-line options to parse
# Returns:
# integer: a FLAGS success condition
_flags_getoptStandard() {
flags_return=${FLAGS_TRUE}
_flags_shortOpts_=`_flags_genOptStr ${__FLAGS_OPTSTR_SHORT}`
# Check for spaces in passed options.
for _flags_opt_ in "$@"; do
# Note: the silliness with the x's is purely for ksh93 on Ubuntu 6.06.
_flags_match_=`echo "x${_flags_opt_}x" |sed 's/ //g'`
if [ "${_flags_match_}" != "x${_flags_opt_}x" ]; then
flags_error='the available getopt does not support spaces in options'
flags_return=${FLAGS_ERROR}
break
fi
done
if [ ${flags_return} -eq ${FLAGS_TRUE} ]; then
__flags_opts=`getopt "${_flags_shortOpts_}" "$@" 2>&1`
_flags_rtrn_=$?
if [ ${_flags_rtrn_} -ne ${FLAGS_TRUE} ]; then
_flags_warn "${__flags_opts}"
flags_error='unable to parse provided options with getopt.'
flags_return=${FLAGS_ERROR}
fi
fi
unset _flags_match_ _flags_opt_ _flags_rtrn_ _flags_shortOpts_
return ${flags_return}
}
# Parse command-line options using the enhanced getopt.
#
# Note: the flag options are passed around in the global __flags_opts so that
# the formatting is not lost due to shell parsing and such.
#
# Args:
# @: varies: command-line options to parse
# Returns:
# integer: a FLAGS success condition
_flags_getoptEnhanced() {
flags_return=${FLAGS_TRUE}
_flags_shortOpts_=`_flags_genOptStr ${__FLAGS_OPTSTR_SHORT}`
_flags_boolOpts_=`echo "${__flags_boolNames}" \
|sed 's/^ *//;s/ *$//;s/ /,/g'`
_flags_longOpts_=`_flags_genOptStr ${__FLAGS_OPTSTR_LONG}`
__flags_opts=`${FLAGS_GETOPT_CMD} \
-o "${_flags_shortOpts_}" \
-l "${_flags_longOpts_},${_flags_boolOpts_}" \
-- "$@" 2>&1`
_flags_rtrn_=$?
if [ ${_flags_rtrn_} -ne ${FLAGS_TRUE} ]; then
_flags_warn "${__flags_opts}"
flags_error='unable to parse provided options with getopt.'
flags_return=${FLAGS_ERROR}
fi
unset _flags_boolOpts_ _flags_longOpts_ _flags_rtrn_ _flags_shortOpts_
return ${flags_return}
}
# Dynamically parse a getopt result and set appropriate variables.
#
# This function does the actual conversion of getopt output and runs it through
# the standard case structure for parsing. The case structure is actually quite
# dynamic to support any number of flags.
#
# Args:
# argc: int: original command-line argument count
# @: varies: output from getopt parsing
# Returns:
# integer: a FLAGS success condition
_flags_parseGetopt() {
_flags_argc_=$1
shift
flags_return=${FLAGS_TRUE}
if [ "${__FLAGS_GETOPT_VERS}" -ne "${__FLAGS_GETOPT_VERS_ENH}" ]; then
# The @$ must be unquoted as it needs to be re-split.
# shellcheck disable=SC2068
set -- $@
else
# Note the quotes around the `$@' -- they are essential!
eval set -- "$@"
fi
# Provide user with the number of arguments to shift by later.
# NOTE: the FLAGS_ARGC variable is obsolete as of 1.0.3 because it does not
# properly give user access to non-flag arguments mixed in between flag
# arguments. Its usage was replaced by FLAGS_ARGV, and it is being kept only
# for backwards compatibility reasons.
FLAGS_ARGC=`_flags_math "$# - 1 - ${_flags_argc_}"`
export FLAGS_ARGC
# Handle options. note options with values must do an additional shift.
while true; do
_flags_opt_=$1
_flags_arg_=${2:-}
_flags_type_=${__FLAGS_TYPE_NONE}
_flags_name_=''
# Determine long flag name.
case "${_flags_opt_}" in
--) shift; break ;; # Discontinue option parsing.
--*) # Long option.
if _flags_useBuiltin; then
_flags_opt_=${_flags_opt_#*--}
else
_flags_opt_=`${FLAGS_EXPR_CMD} "${_flags_opt_}" : '--\(.*\)'`
fi
_flags_len_=${__FLAGS_LEN_LONG}
if _flags_itemInList "${_flags_opt_}" "${__flags_longNames}"; then
_flags_name_=${_flags_opt_}
else
# Check for negated long boolean version.
if _flags_itemInList "${_flags_opt_}" "${__flags_boolNames}"; then
if _flags_useBuiltin; then
_flags_name_=${_flags_opt_#*no}
else
_flags_name_=`${FLAGS_EXPR_CMD} "${_flags_opt_}" : 'no\(.*\)'`
fi
_flags_type_=${__FLAGS_TYPE_BOOLEAN}
_flags_arg_=${__FLAGS_NULL}
fi
fi
;;
-*) # Short option.
if _flags_useBuiltin; then
_flags_opt_=${_flags_opt_#*-}
else
_flags_opt_=`${FLAGS_EXPR_CMD} "${_flags_opt_}" : '-\(.*\)'`
fi
_flags_len_=${__FLAGS_LEN_SHORT}
if _flags_itemInList "${_flags_opt_}" "${__flags_shortNames}"; then
# Yes. Match short name to long name. Note purposeful off-by-one
# (too high) with awk calculations.
_flags_pos_=`echo "${__flags_shortNames}" \
|awk 'BEGIN{RS=" ";rn=0}$0==e{rn=NR}END{print rn}' \
e="${_flags_opt_}"`
_flags_name_=`echo "${__flags_longNames}" \
|awk 'BEGIN{RS=" "}rn==NR{print $0}' rn="${_flags_pos_}"`
fi
;;
esac
# Die if the flag was unrecognized.
if [ -z "${_flags_name_}" ]; then
flags_error="unrecognized option (${_flags_opt_})"
flags_return=${FLAGS_ERROR}
break
fi
# Set new flag value.
_flags_usName_=`_flags_underscoreName "${_flags_name_}"`
[ ${_flags_type_} -eq ${__FLAGS_TYPE_NONE} ] && \
_flags_type_=`_flags_getFlagInfo \
"${_flags_usName_}" ${__FLAGS_INFO_TYPE}`
case ${_flags_type_} in
${__FLAGS_TYPE_BOOLEAN})
if [ ${_flags_len_} -eq ${__FLAGS_LEN_LONG} ]; then
if [ "${_flags_arg_}" != "${__FLAGS_NULL}" ]; then
eval "FLAGS_${_flags_usName_}=${FLAGS_TRUE}"
else
eval "FLAGS_${_flags_usName_}=${FLAGS_FALSE}"
fi
else
_flags_strToEval_="_flags_val_=\
\${__flags_${_flags_usName_}_${__FLAGS_INFO_DEFAULT}}"
eval "${_flags_strToEval_}"
# shellcheck disable=SC2154
if [ "${_flags_val_}" -eq ${FLAGS_FALSE} ]; then
eval "FLAGS_${_flags_usName_}=${FLAGS_TRUE}"
else
eval "FLAGS_${_flags_usName_}=${FLAGS_FALSE}"
fi
fi
;;
${__FLAGS_TYPE_FLOAT})
if _flags_validFloat "${_flags_arg_}"; then
eval "FLAGS_${_flags_usName_}='${_flags_arg_}'"
else
flags_error="invalid float value (${_flags_arg_})"
flags_return=${FLAGS_ERROR}
break
fi
;;
${__FLAGS_TYPE_INTEGER})
if _flags_validInt "${_flags_arg_}"; then
eval "FLAGS_${_flags_usName_}='${_flags_arg_}'"
else
flags_error="invalid integer value (${_flags_arg_})"
flags_return=${FLAGS_ERROR}
break
fi
;;
${__FLAGS_TYPE_STRING})
eval "FLAGS_${_flags_usName_}='${_flags_arg_}'"
;;
esac
# Handle special case help flag.
if [ "${_flags_usName_}" = 'help' ]; then
# shellcheck disable=SC2154
if [ "${FLAGS_help}" -eq ${FLAGS_TRUE} ]; then
flags_help
flags_error='help requested'
flags_return=${FLAGS_FALSE}
break
fi
fi
# Shift the option and non-boolean arguments out.
shift
[ "${_flags_type_}" != ${__FLAGS_TYPE_BOOLEAN} ] && shift
done
# Give user back non-flag arguments.
FLAGS_ARGV=''
while [ $# -gt 0 ]; do
FLAGS_ARGV="${FLAGS_ARGV:+${FLAGS_ARGV} }'$1'"
shift
done
unset _flags_arg_ _flags_len_ _flags_name_ _flags_opt_ _flags_pos_ \
_flags_strToEval_ _flags_type_ _flags_usName_ _flags_val_
return ${flags_return}
}
# Perform some path using built-ins.
#
# Args:
# $@: string: math expression to evaluate
# Output:
# integer: the result
# Returns:
# bool: success of math evaluation
_flags_math() {
if [ $# -eq 0 ]; then
flags_return=${FLAGS_FALSE}
elif _flags_useBuiltin; then
# Variable assignment is needed as workaround for Solaris Bourne shell,
# which cannot parse a bare $((expression)).
# shellcheck disable=SC2016
_flags_expr_='$(($@))'
eval echo ${_flags_expr_}
flags_return=$?
unset _flags_expr_
else
eval expr "$@"
flags_return=$?
fi
return ${flags_return}
}
# Cross-platform strlen() implementation.
#
# Args:
# _flags_str: string: to determine length of
# Output:
# integer: length of string
# Returns:
# bool: success of strlen evaluation
_flags_strlen() {
_flags_str_=${1:-}
if [ -z "${_flags_str_}" ]; then
flags_output=0
elif _flags_useBuiltin; then
flags_output=${#_flags_str_}
else
flags_output=`${FLAGS_EXPR_CMD} "${_flags_str_}" : '.*'`
fi
flags_return=$?
unset _flags_str_
echo "${flags_output}"
return ${flags_return}
}
# Use built-in helper function to enable unit testing.
#
# Args:
# None
# Returns:
# bool: true if built-ins should be used
_flags_useBuiltin() { return ${__FLAGS_USE_BUILTIN}; }
#------------------------------------------------------------------------------
# public functions
#
# A basic boolean flag. Boolean flags do not take any arguments, and their
# value is either 1 (false) or 0 (true). For long flags, the false value is
# specified on the command line by prepending the word 'no'. With short flags,
# the presence of the flag toggles the current value between true and false.
# Specifying a short boolean flag twice on the command results in returning the
# value back to the default value.
#
# A default value is required for boolean flags.
#
# For example, lets say a Boolean flag was created whose long name was 'update'
# and whose short name was 'x', and the default value was 'false'. This flag
# could be explicitly set to 'true' with '--update' or by '-x', and it could be
# explicitly set to 'false' with '--noupdate'.
DEFINE_boolean() { _flags_define ${__FLAGS_TYPE_BOOLEAN} "$@"; }
# Other basic flags.
DEFINE_float() { _flags_define ${__FLAGS_TYPE_FLOAT} "$@"; }
DEFINE_integer() { _flags_define ${__FLAGS_TYPE_INTEGER} "$@"; }
DEFINE_string() { _flags_define ${__FLAGS_TYPE_STRING} "$@"; }
# Parse the flags.
#
# Args:
# unnamed: list: command-line flags to parse
# Returns:
# integer: success of operation, or error
FLAGS() {
# Define a standard 'help' flag if one isn't already defined.
[ -z "${__flags_help_type:-}" ] && \
DEFINE_boolean 'help' false 'show this help' 'h'
# Parse options.
if [ $# -gt 0 ]; then
if [ "${__FLAGS_GETOPT_VERS}" -ne "${__FLAGS_GETOPT_VERS_ENH}" ]; then
_flags_getoptStandard "$@"
else
_flags_getoptEnhanced "$@"
fi
flags_return=$?
else
# Nothing passed; won't bother running getopt.
__flags_opts='--'
flags_return=${FLAGS_TRUE}
fi
if [ ${flags_return} -eq ${FLAGS_TRUE} ]; then
_flags_parseGetopt $# "${__flags_opts}"
flags_return=$?
fi
[ ${flags_return} -eq ${FLAGS_ERROR} ] && _flags_fatal "${flags_error}"
return ${flags_return}
}
# This is a helper function for determining the 'getopt' version for platforms
# where the detection isn't working. It simply outputs debug information that
# can be included in a bug report.
#
# Args:
# none
# Output:
# debug info that can be included in a bug report
# Returns:
# nothing
flags_getoptInfo() {
# Platform info.
_flags_debug "uname -a: `uname -a`"
_flags_debug "PATH: ${PATH}"
# Shell info.
if [ -n "${BASH_VERSION:-}" ]; then
_flags_debug 'shell: bash'
_flags_debug "BASH_VERSION: ${BASH_VERSION}"
elif [ -n "${ZSH_VERSION:-}" ]; then
_flags_debug 'shell: zsh'
_flags_debug "ZSH_VERSION: ${ZSH_VERSION}"
fi
# getopt info.
${FLAGS_GETOPT_CMD} >/dev/null
_flags_getoptReturn=$?
_flags_debug "getopt return: ${_flags_getoptReturn}"
_flags_debug "getopt --version: `${FLAGS_GETOPT_CMD} --version 2>&1`"
unset _flags_getoptReturn
}
# Returns whether the detected getopt version is the enhanced version.
#
# Args:
# none
# Output:
# none
# Returns:
# bool: true if getopt is the enhanced version
flags_getoptIsEnh() {
test "${__FLAGS_GETOPT_VERS}" -eq "${__FLAGS_GETOPT_VERS_ENH}"
}
# Returns whether the detected getopt version is the standard version.
#
# Args:
# none
# Returns:
# bool: true if getopt is the standard version
flags_getoptIsStd() {
test "${__FLAGS_GETOPT_VERS}" -eq "${__FLAGS_GETOPT_VERS_STD}"
}
# This is effectively a 'usage()' function. It prints usage information and
# exits the program with ${FLAGS_FALSE} if it is ever found in the command line
# arguments. Note this function can be overridden so other apps can define
# their own --help flag, replacing this one, if they want.
#
# Args:
# none
# Returns:
# integer: success of operation (always returns true)
flags_help() {
if [ -n "${FLAGS_HELP:-}" ]; then
echo "${FLAGS_HELP}" >&2
else
echo "USAGE: ${FLAGS_PARENT:-$0} [flags] args" >&2
fi
if [ -n "${__flags_longNames}" ]; then
echo 'flags:' >&2
for flags_name_ in ${__flags_longNames}; do
flags_flagStr_=''
flags_boolStr_=''
flags_usName_=`_flags_underscoreName "${flags_name_}"`
flags_default_=`_flags_getFlagInfo \
"${flags_usName_}" ${__FLAGS_INFO_DEFAULT}`
flags_help_=`_flags_getFlagInfo \
"${flags_usName_}" ${__FLAGS_INFO_HELP}`
flags_short_=`_flags_getFlagInfo \
"${flags_usName_}" ${__FLAGS_INFO_SHORT}`
flags_type_=`_flags_getFlagInfo \
"${flags_usName_}" ${__FLAGS_INFO_TYPE}`
[ "${flags_short_}" != "${__FLAGS_NULL}" ] && \
flags_flagStr_="-${flags_short_}"
if [ "${__FLAGS_GETOPT_VERS}" -eq "${__FLAGS_GETOPT_VERS_ENH}" ]; then
[ "${flags_short_}" != "${__FLAGS_NULL}" ] && \
flags_flagStr_="${flags_flagStr_},"
# Add [no] to long boolean flag names, except the 'help' flag.
[ "${flags_type_}" -eq ${__FLAGS_TYPE_BOOLEAN} \
-a "${flags_usName_}" != 'help' ] && \
flags_boolStr_='[no]'
flags_flagStr_="${flags_flagStr_}--${flags_boolStr_}${flags_name_}:"
fi
case ${flags_type_} in
${__FLAGS_TYPE_BOOLEAN})
if [ "${flags_default_}" -eq ${FLAGS_TRUE} ]; then
flags_defaultStr_='true'
else
flags_defaultStr_='false'
fi
;;
${__FLAGS_TYPE_FLOAT}|${__FLAGS_TYPE_INTEGER})
flags_defaultStr_=${flags_default_} ;;
${__FLAGS_TYPE_STRING}) flags_defaultStr_="'${flags_default_}'" ;;
esac
flags_defaultStr_="(default: ${flags_defaultStr_})"
flags_helpStr_=" ${flags_flagStr_} ${flags_help_:+${flags_help_} }${flags_defaultStr_}"
_flags_strlen "${flags_helpStr_}" >/dev/null
flags_helpStrLen_=${flags_output}
flags_columns_=`_flags_columns`
if [ "${flags_helpStrLen_}" -lt "${flags_columns_}" ]; then
echo "${flags_helpStr_}" >&2
else
echo " ${flags_flagStr_} ${flags_help_}" >&2
# Note: the silliness with the x's is purely for ksh93 on Ubuntu 6.06
# because it doesn't like empty strings when used in this manner.
flags_emptyStr_="`echo \"x${flags_flagStr_}x\" \
|awk '{printf "%"length($0)-2"s", ""}'`"
flags_helpStr_=" ${flags_emptyStr_} ${flags_defaultStr_}"
_flags_strlen "${flags_helpStr_}" >/dev/null
flags_helpStrLen_=${flags_output}
if [ "${__FLAGS_GETOPT_VERS}" -eq "${__FLAGS_GETOPT_VERS_STD}" \
-o "${flags_helpStrLen_}" -lt "${flags_columns_}" ]; then
# Indented to match help string.
echo "${flags_helpStr_}" >&2
else
# Indented four from left to allow for longer defaults as long flag
# names might be used too, making things too long.
echo " ${flags_defaultStr_}" >&2
fi
fi
done
fi
unset flags_boolStr_ flags_default_ flags_defaultStr_ flags_emptyStr_ \
flags_flagStr_ flags_help_ flags_helpStr flags_helpStrLen flags_name_ \
flags_columns_ flags_short_ flags_type_ flags_usName_
return ${FLAGS_TRUE}
}
# Reset shflags back to an uninitialized state.
#
# Args:
# none
# Returns:
# nothing
flags_reset() {
for flags_name_ in ${__flags_longNames}; do
flags_usName_=`_flags_underscoreName "${flags_name_}"`
flags_strToEval_="unset FLAGS_${flags_usName_}"
for flags_type_ in \
${__FLAGS_INFO_DEFAULT} \
${__FLAGS_INFO_HELP} \
${__FLAGS_INFO_SHORT} \
${__FLAGS_INFO_TYPE}
do
flags_strToEval_=\
"${flags_strToEval_} __flags_${flags_usName_}_${flags_type_}"
done
eval "${flags_strToEval_}"
done
# Reset internal variables.
__flags_boolNames=' '
__flags_longNames=' '
__flags_shortNames=' '
__flags_definedNames=' '
# Reset logging level back to default.
flags_setLoggingLevel ${__FLAGS_LEVEL_DEFAULT}
unset flags_name_ flags_type_ flags_strToEval_ flags_usName_
}
#
# Initialization
#
# Set the default logging level.
flags_setLoggingLevel ${__FLAGS_LEVEL_DEFAULT}
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