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518 lines (427 loc) · 10.4 KB
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#!/usr/bin/env ksh
# ----------------------------------------------------------------------
# loader.ksh
#
# This script implements Shell Script Loader for Ksh - the original
# Ksh (KornShell 93+), the public domain Korn shell (PD KSH), and
# MirBSD Korn shell (mksh).
#
# Please see loader.txt for more info on how to use this script.
#
# This script complies with the Requiring Specifications of
# Shell Script Loader version 0 (RS0)
#
# Version: 0.2
#
# Author: konsolebox
# Copyright Free / Public Domain
# Aug. 29, 2009 (Last Updated 2016/06/28)
# Limitations of Shell Script Loader in PD KSH:
#
# In PD KSH (not the Ksh 93+), typeset declarations inside functions
# always make variables only available within the encapsulating function
# therefore scripts that have typeset declarations that are meant to
# create global variables when called within a loader function like
# include() will only have visibility inside include().
#
# Array indices in PD KSH are currently limited to the range of 0
# through 1023 but this value is big enough for the list of search paths
# and for the call stack.
# ----------------------------------------------------------------------
if [ "$LOADER_ACTIVE" = true ]; then
echo "loader: Loader cannot be loaded twice." >&2
exit 1
fi
if ( eval '[ -n "${.sh.version}" ] && exit 10' ) >/dev/null 2>&1; [ "$?" -eq 10 ]; then
LOADER_SHELL=ksh93
else
case $KSH_VERSION in
'@(#)PD KSH '*)
LOADER_SHELL=pdksh
;;
'@(#)MIRBSD KSH '*)
LOADER_SHELL=mksh
;;
'')
if [ "$ZSH_NAME" = ksh ]; then
echo "loader: Emulated Ksh from Zsh does not work with this script." >&2
else
echo "loader: Ksh is needed to run this script." >&2
fi
exit 1
;;
*)
echo "loader: Version of Ksh is not supported." >&2
exit 1
;;
esac
fi
#### PUBLIC VARIABLES ####
LOADER_ACTIVE=true
LOADER_RS=0
LOADER_VERSION=0.2
#### PRIVATE VARIABLES ####
set -A LOADER_CS
set -A LOADER_PATHS
LOADER_CS_I=0
#### PUBLIC FUNCTIONS ####
load() {
[[ $# -eq 0 ]] && loader_fail "Function called with no argument." load
case $1 in
'')
loader_fail "File expression cannot be null." load "$@"
;;
/*|./*|../*)
if [[ -f $1 ]]; then
loader_getcleanpath "$1"
[[ -r $__ ]] || loader_fail "File not readable: $__" load "$@"
shift
loader_load "$@"
__=$?
unset 'LOADER_CS[LOADER_CS_I--]'
return "$__"
fi
;;
*)
for __ in "${LOADER_PATHS[@]}"; do
[[ -f $__/$1 ]] || continue
loader_getcleanpath "$__/$1"
[[ -r $__ ]] || loader_fail "Found file not readable: $__" load "$@"
loader_flag_ "$1"
shift
loader_load "$@"
__=$?
unset 'LOADER_CS[LOADER_CS_I--]'
return "$__"
done
;;
esac
loader_fail "File not found: $1" load "$@"
}
include() {
[[ $# -eq 0 ]] && loader_fail "Function called with no argument." include
case $1 in
'')
loader_fail "File expression cannot be null." include "$@"
;;
/*|./*|../*)
loader_getcleanpath "$1"
loader_flagged "$__" && return
if [[ -f $__ ]]; then
[[ -r $__ ]] || loader_fail "File not readable: $__" include "$@"
shift
loader_load "$@"
__=$?
unset 'LOADER_CS[LOADER_CS_I--]'
return "$__"
fi
;;
*)
loader_flagged "$1" && return
for __ in "${LOADER_PATHS[@]}"; do
loader_getcleanpath "$__/$1"
if loader_flagged "$__"; then
loader_flag_ "$1"
return 0
elif [[ -f $__ ]]; then
[[ -r $__ ]] || loader_fail "Found file not readable: $__" include "$@"
loader_flag_ "$1"
shift
loader_load "$@"
__=$?
unset 'LOADER_CS[LOADER_CS_I--]'
return "$__"
fi
done
;;
esac
loader_fail "File not found: $1" include "$@"
}
call() {
[[ $# -eq 0 ]] && loader_fail "Function called with no argument." call
case $1 in
'')
loader_fail "File expression cannot be null." call "$@"
;;
/*|./*|../*)
if [[ -f $1 ]]; then
loader_getcleanpath "$1"
[[ -r $__ ]] || loader_fail "File not readable: $__" call "$@"
(
shift
loader_load "$@"
)
return
fi
;;
*)
for __ in "${LOADER_PATHS[@]}"; do
[[ -f $__/$1 ]] || continue
loader_getcleanpath "$__/$1"
[[ -r $__ ]] || loader_fail "Found file not readable: $__" call "$@"
(
loader_flag_ "$1"
shift
loader_load "$@"
)
return
done
;;
esac
loader_fail "File not found: $1" call "$@"
}
loader_addpath() {
for __ in "$@"; do
[[ -d $__ ]] || loader_fail "Directory not found: $__" loader_addpath "$@"
[[ -x $__ ]] || loader_fail "Directory not accessible: $__" loader_addpath "$@"
[[ -r $__ ]] || loader_fail "Directory not searchable: $__" loader_addpath "$@"
loader_getcleanpath "$__"
loader_addpath_ "$__"
done
}
loader_flag() {
[[ $# -eq 1 ]] || loader_fail "Function requires a single argument." loader_flag "$@"
loader_getcleanpath "$1"
loader_flag_ "$__"
}
loader_reset() {
if [[ $# -eq 0 ]]; then
loader_reset_flags
loader_reset_paths
elif [[ $1 == flags ]]; then
loader_reset_flags
elif [[ $1 == paths ]]; then
loader_reset_paths
else
loader_fail "Invalid argument: $1" loader_reset "$@"
fi
}
loader_finish() {
LOADER_ACTIVE=false
loader_reset_flags
unset -v LOADER_CS LOADER_CS_I LOADER_FLAGS LOADER_PATHS \
LOADER_PATHS_FLAGS
unset -f load include call loader_addpath loader_addpath_ \
loader_fail loader_flagged loader_flag loader_flag_ \
loader_getcleanpath loader_load loader_reset
}
#### PRIVATE FUNCTIONS ####
loader_load() {
loader_flag_ "$__"
LOADER_CS[++LOADER_CS_I]=$__
. "$__"
}
loader_getcleanpath() {
case $1 in
.|'')
__=$PWD
;;
/)
__=/
;;
..|../*|*/..|*/../*|./*|*/.|*/./*|*//*)
loader_getcleanpath_ "$1"
;;
/*)
__=${1%/}
;;
*)
__=${PWD%/}/${1%/}
;;
esac
}
loader_fail() {
MESSAGE=$1 FUNC=$2
shift 2
{
echo "loader: $FUNC(): $MESSAGE"
echo
echo " Current scope:"
if [[ LOADER_CS_I -gt 0 ]]; then
print -r " ${LOADER_CS[LOADER_CS_I]}"
else
echo " (main)"
fi
echo
if [[ $# -gt 0 ]]; then
echo " Command:"
print -rn " $FUNC"
for __; do
print -rn " \"$__\""
done
echo
echo
fi
if [[ LOADER_CS_I -gt 0 ]]; then
echo " Call stack:"
echo " (main)"
I=1
while [[ I -le LOADER_CS_I ]]; do
print -r " -> ${LOADER_CS[I]}"
(( ++I ))
done
echo
fi
echo " Search paths:"
if [[ ${#LOADER_PATHS[@]} -gt 0 ]]; then
for __ in "${LOADER_PATHS[@]}"; do
echo " $__"
done
else
echo " (empty)"
fi
echo
echo " Working directory:"
print -r " $PWD"
echo
} >&2
exit 1
}
#### VERSION DEPENDENT FUNCTIONS AND VARIABLES ####
if [[ $LOADER_SHELL == ksh93 ]]; then
eval '
LOADER_FLAGS=([.]=.)
LOADER_PATHS_FLAGS=([.]=.)
loader_addpath_() {
if [[ -z ${LOADER_PATHS_FLAGS[$1]} ]]; then
LOADER_PATHS[${#LOADER_PATHS[@]}]=$1
LOADER_PATHS_FLAGS[$1]=.
fi
}
loader_flag_() {
LOADER_FLAGS[$1]=.
}
loader_flagged() {
[[ -n ${LOADER_FLAGS[$1]} ]]
}
loader_reset_flags() {
LOADER_FLAGS=()
}
loader_reset_paths() {
set -A LOADER_PATHS
LOADER_PATHS_FLAGS=()
}
'
else
loader_addpath_() {
for __ in "${LOADER_PATHS[@]}"; do
[[ $1 == "$__" ]] && return
done
LOADER_PATHS[${#LOADER_PATHS[@]}]=$1
}
if [[ $LOADER_SHELL == mksh ]]; then
loader_flag_() {
typeset V=${1//./_dt_}
V=${V// /_sp_}
V=${V//\//_sl_}
V=LOADER_FLAGS_${V//[!a-zA-Z0-9_]/_ot_}
typeset -n R=$V
R=.
}
loader_flagged() {
typeset V=${1//./_dt_}
V=${V// /_sp_}
V=${V//\//_sl_}
V=LOADER_FLAGS_${V//[!a-zA-Z0-9_]/_ot_}
typeset -n R=$V
[[ -n $R ]]
}
else
hash sed
loader_flag_() {
eval "LOADER_FLAGS_$(echo "$1" | sed 's/\./_dt_/g; s/\//_sl_/g; s/ /_sp_/g; s/[^[:alnum:]_]/_ot_/g')=."
}
loader_flagged() {
eval "[[ -n \$LOADER_FLAGS_$(echo "$1" | sed 's/\./_dt_/g; s/\//_sl_/g; s/ /_sp_/g; s/[^[:alnum:]_]/_ot_/g') ]]"
}
fi
hash grep cut
loader_reset_flags() {
typeset IFS='
'
unset $(set | grep -a ^LOADER_FLAGS_ | cut -f 1 -d =)
}
loader_reset_paths() {
set -A LOADER_PATHS
}
fi
if [[ $LOADER_SHELL == ksh93 || $LOADER_SHELL == mksh ]]; then
__='{
typeset T1 T2 I=0 IFS=/
[[ $1 == /* ]] && __=${1#/} || __=${PWD#/}/$1
read -rA T1 << .
$__
.
for __ in "${T1[@]}"; do
case $__ in
..)
[[ I -gt 0 ]] && unset T2\[--I\]
continue
;;
.|"")
continue
;;
esac
T2[I++]=$__
done
__="/${T2[*]}"
}'
if [[ $LOADER_SHELL == ksh93 ]]; then
eval "function loader_getcleanpath_ $__"
else
eval "loader_getcleanpath_() $__"
fi
else
loader_getcleanpath_() {
typeset A IFS=/ T I=0
[[ $1 == /* ]] && A=${1#/} || A=${PWD#/}/$1
while
__=${A%%/*}
case $__ in
..)
[[ I -gt 0 ]] && unset 'T[--I]'
;;
.|'')
;;
*)
T[I++]=$__
;;
esac
[[ $A == */* ]]
do
A=${A#*/}
done
__="/${T[*]}"
}
fi
unset -v LOADER_SHELL
# ----------------------------------------------------------------------
# * In some if not all versions of Ksh, "${@:X[:Y]}" always presents a
# single null string if no positional parameter is matched.
# * In some versions of Ksh, 'read <<< "$VAR"' includes '"' in the
# string.
# * Using 'set -- $VAR' to split strings inside variables will sometimes
# yield different strings if one of the strings contain globs
# characters like *, ? and the brackets [ and ] that are also valid
# characters in filenames.
# * Changing the IFS causes buggy behaviors in PD KSH.
# * Newer versions of Ksh93 crashes with test (at least starting with
# 2011-02-08). 2007-03-28 works. Other versions still need testing.
# * Unsetting functions requires explicit use of -f option.
# * PD KSH and mksh does not expand ${@:2}.
# * PD KSH and mksh interpretes backslash sequences in a single-quote
# string so we should be careful with it.
# * In PD KSH or mksh, it doesn't matter whether we use the 'function'
# keyword or not when defining a function that uses local variables.
# * 'echo' and 'print' interprets some backslash characters by default
# in PD KSH and mksh. We use 'print -r' instead. It also musn't be
# confused with how single quote strings are stored.
# * Sometimes in a function declared with the 'function' keyword, Ksh93
# keeps a variable local even though it wasn't declared with
# 'typeset'. The changes on the variable does not reflect on the
# calling function if the calling function declares the variable as
# local with 'typeset'.
# * Declaring functions in bourne-shell format is intuitively more
# efficient for PD KSH and mksh since it doesn't touch $0 and doesn't
# store OPTIND and shell options for local scoping.
# ----------------------------------------------------------------------
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