# $Id$
# $MirOS: src/bin/mksh/dot.mkshrc,v 1.136 2021/01/24 20:38:30 tg Exp $
#-
# Copyright (c) 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2010,
#		2011, 2012, 2013, 2014, 2015, 2016, 2017, 2019,
#		2020, 2021
#	mirabilos <m@mirbsd.org>
#
# Provided that these terms and disclaimer and all copyright notices
# are retained or reproduced in an accompanying document, permission
# is granted to deal in this work without restriction, including un-
# limited rights to use, publicly perform, distribute, sell, modify,
# merge, give away, or sublicence.
#
# This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
# the utmost extent permitted by applicable law, neither express nor
# implied; without malicious intent or gross negligence. In no event
# may a licensor, author or contributor be held liable for indirect,
# direct, other damage, loss, or other issues arising in any way out
# of dealing in the work, even if advised of the possibility of such
# damage or existence of a defect, except proven that it results out
# of said person's immediate fault when using the work as intended.
#-
# ${ENV:-~/.mkshrc}: mksh initialisation file for interactive shells

# catch non-mksh, non-lksh, trying to run this file
case ${KSH_VERSION:-} in
*LEGACY\ KSH*|*MIRBSD\ KSH*) ;;
*) \return 0 ;;
esac

# give MidnightBSD's laffer1 a bit of csh feeling
function setenv {
	if (( $# )); then
		\\builtin eval '\\builtin export "$1"="${2:-}"'
	else
		\\builtin typeset -x
	fi
}

# internal helper function to cat all arguments if necessary
function _dot_mkshrc_wrapped_cat {
	\\builtin typeset fn=$1
	\\builtin shift

	if [[ $# = 0 || $#,$1 = 1,- ]]; then
		"$fn"
	else
		\cat "$@" | "$fn"
	fi
}
function _dot_mkshrc_cat_for_readN {
	\\builtin typeset fn=$1
	\\builtin shift

	if (( $# )); then
		\\builtin print -nr -- "$*" | "$fn"
	elif [[ -t 0 ]]; then
		\cat | "$fn"
	else
		"$fn"
	fi
}

# pager (not control character safe)
function smores {
	\_dot_mkshrc_wrapped_cat _dot_mkshrc_smores "$@"
}
function _dot_mkshrc_smores {
	\\builtin set +e
	\\builtin typeset line llen curlin=0 x

	while IFS= \\builtin read -r line; do
		llen=${%line}
		(( llen != -1 )) || llen=${#line}
		(( llen = llen ? (llen + COLUMNS - 1) / COLUMNS : 1 ))
		if (( (curlin += llen) >= LINES )); then
			\\builtin print -nr -- $'\e[7m--more--\e[0m'
			\\builtin read -u1 x || \\builtin return $?
			[[ $x != [Qq]* ]] || \\builtin return 0
			curlin=$llen
		fi
		\\builtin print -r -- "$line"
	done
}

# customise your favourite editor here; the first one found is used
for EDITOR in "${EDITOR:-}" jupp jstar mcedit ed vi; do
	EDITOR=$(\\builtin whence -p "$EDITOR") || EDITOR=
	[[ -n $EDITOR && -x $EDITOR ]] && break
	EDITOR=
done

\\builtin alias ls=ls l='ls -F' la='l -a' ll='l -l' lo='l -al'
\: "${EDITOR:=/bin/ed}${TERM:=vt100}${USER:=$(\\builtin ulimit -c 0; id -un \
    2>/dev/null)}${HOSTNAME:=$(\\builtin ulimit -c 0; hostname 2>/dev/null)}"
[[ $HOSTNAME = ?(?(ip6-)localhost?(6)) ]] && HOSTNAME=nil; \\builtin unalias ls
\\builtin export EDITOR HOSTNAME TERM USER="${USER:-?}"

# minimal support for lksh users
if [[ $KSH_VERSION = *LEGACY\ KSH* ]]; then
	PS1='$USER@${HOSTNAME%%.*}:$PWD>'
	\\builtin return 0
fi

# mksh-specific from here
\: "${MKSH:=$(\\builtin whence -p mksh)}${MKSH:=/bin/mksh}"
\\builtin export MKSH

# prompts
PS4='[$EPOCHREALTIME] '; PS1='#'; (( USER_ID )) && PS1='$'; PS1=$'\001\r''${|
	\\builtin typeset e=$? hn=${HOSTNAME:-nil}

	(( !!e )) || REPLY+="$e|"
	REPLY+=${USER:-?}@${hn%%.*}:

	\\builtin typeset d=${PWD:-?}/ p=~; [[ $p = ?(*/) ]] || d=${d/#$p\//\~/}
	d=${d%/}; \\builtin typeset m=${%d} n p=...; (( m > 0 )) || m=${#d}
	(( m > (n = (COLUMNS/3 < 7 ? 7 : COLUMNS/3)) )) && d=${d:(-n)} || p=
	REPLY+=$p$d

	\\builtin return $e
} '"$PS1 "

# utilities
\\builtin alias doch='sudo mksh -c "$(\\builtin fc -ln -1)"'
\\builtin command -v rot13 >/dev/null || \\builtin alias rot13='tr \
    abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ \
    nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM'
if \\builtin command -v hd >/dev/null; then
	\:
elif \\builtin command -v hexdump >/dev/null; then
	function hd {
		\hexdump -e '"%08.8_ax  " 8/1 "%02X " " - " 8/1 "%02X "' \
		    -e '"  |" "%_p"' -e '"|\n"' "$@"
	}
else
	function hd {
		# cannot use _dot_mkshrc_wrapped_cat as hd_mksh sets stdin raw
		\cat "$@" | \hd_mksh
	}
fi

# NUL-safe and EBCDIC-safe hexdump (from stdin)
function hd_mksh {
	\\builtin typeset -Uui16 -Z11 pos=0
	\\builtin typeset -Uui16 -Z5 hv=2147483647
	\\builtin typeset dasc dn line i
	\\builtin set +Ue

	while \\builtin read -arn 512 line; do
		\\builtin typeset -i1 'line[*]'
		i=0
		while (( i < ${#line[*]} )); do
			dn=
			(( (hv = line[i++]) != 0 )) && dn=${line[i-1]#1#}
			if (( (pos & 15) == 0 )); then
				(( pos )) && \
				    \\builtin print -r -- "$dasc|"
				\\builtin print -nr "${pos#16#}  "
				dasc=' |'
			fi
			\\builtin print -nr "${hv#16#} "
			if [[ $dn = [[:print:]] ]]; then
				dasc+=$dn
			else
				dasc+=.
			fi
			(( (pos++ & 15) == 7 )) && \
			    \\builtin print -nr -- '- '
		done
	done
	while (( pos & 15 )); do
		\\builtin print -nr '   '
		(( (pos++ & 15) == 7 )) && \
		    \\builtin print -nr -- '- '
	done
	(( hv == 2147483647 )) || \\builtin print -r -- "$dasc|"
}

function which {
	\\builtin typeset p x c
	\\builtin typeset -i a=0 rv=2 e
	\\builtin set +e
	\\builtin set -o noglob

	while \\builtin getopts "a" x; do
		case $x {
		(a)	a=1 ;;
		(+a)	a=0 ;;
		(*)	\\builtin print -ru2 'Usage: which [-a] name [...]'
			\\builtin return 255 ;;
		}
	done
	\\builtin shift $((OPTIND - 1))

	#        vvvvvvvvvvvvvvvvvvvv should be def_path
	p=${PATH-/usr/bin$PATHSEP/bin}
	#       ^ no colon!

	# trailing PATHSEP vs field splitting
	[[ $p = *"$PATHSEP" ]] && p+=.

	IFS=$PATHSEP
	\\builtin set -A p -- ${p:-.}
	IFS=$' \t\n'

	for x in "$@"; do
		if (( !a )) || [[ $x = */* ]]; then
			\\builtin whence -p -- "$x"
			e=$?
		else
			e=1
			for c in "${p[@]}"; do
				PATH=${c:-.} \\builtin whence -p -- "$x" && e=0
			done
		fi
		(( rv = (e == 0) ? (rv & ~2) : (rv == 2 ? 2 : 1) ))
	done
	\\builtin return $rv
}

# Berkeley C shell compatible dirs, popd, and pushd functions
# Z shell compatible chpwd() hook, used to update DIRSTACK[0]
DIRSTACKBASE=$(\\builtin realpath ~/. 2>/dev/null || \
    \\builtin print -nr -- "${HOME:-/}")
\\builtin set -A DIRSTACK
function chpwd {
	DIRSTACK[0]=$(\\builtin realpath . 2>/dev/null || \
	    \\builtin print -nr -- "$PWD")
	[[ $DIRSTACKBASE = ?(*/) ]] || \
	    DIRSTACK[0]=${DIRSTACK[0]/#$DIRSTACKBASE/\~}
	\:
}
\chpwd .
cd() {
	\\builtin cd "$@" || \\builtin return $?
	\chpwd "$@"
}
function cd_csh {
	\\builtin typeset d t=${1/#\~/$DIRSTACKBASE}

	if ! d=$(\\builtin cd "$t" 2>&1); then
		\\builtin print -ru2 "${1}: ${d##*cd: $t: }."
		\\builtin return 1
	fi
	\cd "$t"
}
function dirs {
	\\builtin set +e
	\\builtin typeset d dwidth
	\\builtin typeset -i fl=0 fv=0 fn=0 cpos=0

	while \\builtin getopts ":lvn" d; do
		case $d {
		(l)	fl=1 ;;
		(v)	fv=1 ;;
		(n)	fn=1 ;;
		(*)	\\builtin print -ru2 'Usage: dirs [-lvn].'
			\\builtin return 1 ;;
		}
	done
	\\builtin shift $((OPTIND - 1))
	if (( $# > 0 )); then
		\\builtin print -ru2 'Usage: dirs [-lvn].'
		\\builtin return 1
	fi
	if (( fv )); then
		fv=0
		while (( fv < ${#DIRSTACK[*]} )); do
			d=${DIRSTACK[fv]}
			(( fl )) && d=${d/#\~/$DIRSTACKBASE}
			\\builtin print -r -- "$fv	$d"
			(( ++fv ))
		done
	else
		fv=0
		while (( fv < ${#DIRSTACK[*]} )); do
			d=${DIRSTACK[fv]}
			(( fl )) && d=${d/#\~/$DIRSTACKBASE}
			(( dwidth = (${%d} > 0 ? ${%d} : ${#d}) ))
			if (( fn && (cpos += dwidth + 1) >= 79 && \
			    dwidth < 80 )); then
				\\builtin print
				(( cpos = dwidth + 1 ))
			fi
			\\builtin print -nr -- "$d "
			(( ++fv ))
		done
		\\builtin print
	fi
	\\builtin return 0
}
function popd {
	\\builtin typeset d fa
	\\builtin typeset -i n=1

	while \\builtin getopts ":0123456789lvn" d; do
		case $d {
		(l|v|n)	fa+=" -$d" ;;
		(+*)	n=2
			\\builtin break ;;
		(*)	\\builtin print -ru2 'Usage: popd [-lvn] [+<n>].'
			\\builtin return 1 ;;
		}
	done
	\\builtin shift $((OPTIND - n))
	n=0
	if (( $# > 1 )); then
		\\builtin print -ru2 popd: Too many arguments.
		\\builtin return 1
	elif [[ $1 = ++([0-9]) && $1 != +0 ]]; then
		if (( (n = ${1#+}) >= ${#DIRSTACK[*]} )); then
			\\builtin print -ru2 popd: Directory stack not that deep.
			\\builtin return 1
		fi
	elif [[ -n $1 ]]; then
		\\builtin print -ru2 popd: Bad directory.
		\\builtin return 1
	fi
	if (( ${#DIRSTACK[*]} < 2 )); then
		\\builtin print -ru2 popd: Directory stack empty.
		\\builtin return 1
	fi
	\\builtin unset DIRSTACK[n]
	\\builtin set -A DIRSTACK -- "${DIRSTACK[@]}"
	\cd_csh "${DIRSTACK[0]}" || \\builtin return 1
	\dirs $fa
}
function pushd {
	\\builtin typeset d fa
	\\builtin typeset -i n=1

	while \\builtin getopts ":0123456789lvn" d; do
		case $d {
		(l|v|n)	fa+=" -$d" ;;
		(+*)	n=2
			\\builtin break ;;
		(*)	\\builtin print -ru2 'Usage: pushd [-lvn] [<dir>|+<n>].'
			\\builtin return 1 ;;
		}
	done
	\\builtin shift $((OPTIND - n))
	if (( $# == 0 )); then
		if (( ${#DIRSTACK[*]} < 2 )); then
			\\builtin print -ru2 pushd: No other directory.
			\\builtin return 1
		fi
		d=${DIRSTACK[1]}
		DIRSTACK[1]=${DIRSTACK[0]}
		\cd_csh "$d" || \\builtin return 1
	elif (( $# > 1 )); then
		\\builtin print -ru2 pushd: Too many arguments.
		\\builtin return 1
	elif [[ $1 = ++([0-9]) && $1 != +0 ]]; then
		if (( (n = ${1#+}) >= ${#DIRSTACK[*]} )); then
			\\builtin print -ru2 pushd: Directory stack not that deep.
			\\builtin return 1
		fi
		while (( n-- )); do
			d=${DIRSTACK[0]}
			\\builtin unset DIRSTACK[0]
			\\builtin set -A DIRSTACK -- "${DIRSTACK[@]}" "$d"
		done
		\cd_csh "${DIRSTACK[0]}" || \\builtin return 1
	else
		\\builtin set -A DIRSTACK -- placeholder "${DIRSTACK[@]}"
		\cd_csh "$1" || \\builtin return 1
	fi
	\dirs $fa
}

# base64 encoder and decoder, RFC compliant, NUL safe, not EBCDIC safe
function Lb64decode {
	\\builtin set +Ue
	\\builtin typeset c s t
	if (( $# )); then
		s="$*"
	elif [[ -t 0 ]]; then
		s=$(\cat || \\builtin exit $?; \\builtin print x) || \
		    \\builtin return $?
		s=${s%x}
	else
		\\builtin read -rN-1 s || \\builtin return $?
	fi
	\\builtin typeset -i i=0 j=0 n=${#s} p=0 v x
	\\builtin typeset -i16 o

	while (( i < n )); do
		c=${s:(i++):1}
		case $c {
		(=)	\\builtin break ;;
		([A-Z])	(( v = 1#$c - 65 )) ;;
		([a-z])	(( v = 1#$c - 71 )) ;;
		([0-9])	(( v = 1#$c + 4 )) ;;
		(+)	v=62 ;;
		(/)	v=63 ;;
		(*)	\\builtin continue ;;
		}
		(( x = (x << 6) | v ))
		case $((p++)) {
		(0)	\\builtin continue ;;
		(1)	(( o = (x >> 4) & 255 )) ;;
		(2)	(( o = (x >> 2) & 255 )) ;;
		(3)	(( o = x & 255 ))
			p=0
			;;
		}
		t+=\\x${o#16#}
		(( ++j & 4095 )) && \\builtin continue
		\\builtin print -n -- "$t"
		t=
	done
	\\builtin print -n -- "$t"
}
function Lb64encode {
	\_dot_mkshrc_cat_for_readN _dot_mkshrc_b64encode "$@"
}
function _dot_mkshrc_b64encode {
	\\builtin set +Ue
	\\builtin typeset c s t table
	\\builtin set -A table -- A B C D E F G H I J K L M N O P Q R S T U V W X Y Z \
	    a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9 + /
	\\builtin read -raN-1 s || \\builtin return $?
	\\builtin typeset -i i=0 n=${#s[*]} v

	while (( i < n )); do
		(( v = s[i++] << 16 ))
		(( v |= s[i++] << 8 ))
		(( v |= s[i++] ))
		t+=${table[v >> 18]}${table[v >> 12 & 63]}
		c=${table[v >> 6 & 63]}
		if (( i <= n )); then
			t+=$c${table[v & 63]}
		elif (( i == n + 1 )); then
			t+=$c=
		else
			t+===
		fi
		if (( ${#t} == 76 || i >= n )); then
			\\builtin print -r -- "$t"
			t=
		fi
	done
	\:
}

# Better Avalanche for the Jenkins Hash
\\builtin typeset -Z11 -Uui16 Lbafh_v
function Lbafh_init {
	Lbafh_v=0
}
function Lbafh_add {
	\_dot_mkshrc_cat_for_readN _dot_mkshrc_bafh_add "$@"
}
function _dot_mkshrc_bafh_add {
	\\builtin set +Ue
	\\builtin typeset s
	\\builtin read -raN-1 s || \\builtin return $?
	\\builtin typeset -i i=0 n=${#s[*]}

	while (( i < n )); do
		((# Lbafh_v = (Lbafh_v + s[i++] + 1) * 1025 ))
		((# Lbafh_v ^= Lbafh_v >> 6 ))
	done
	\:
}
function Lbafh_finish {
	\\builtin set +e
	\\builtin typeset -Ui t

	((# t = (((Lbafh_v >> 7) & 0x01010101) * 0x1B) ^ \
	    ((Lbafh_v << 1) & 0xFEFEFEFE) ))
	((# Lbafh_v = t ^ (t ^> 8) ^ (Lbafh_v ^> 8) ^ \
	    (Lbafh_v ^> 16) ^ (Lbafh_v ^> 24) ))
	\:
}

# strip comments (and leading/trailing whitespace if IFS is set) from
# any file(s) given as argument, or stdin if none, and spew to stdout
function Lstripcom {
	\_dot_mkshrc_wrapped_cat _dot_mkshrc_stripcom "$@"
}
function _dot_mkshrc_stripcom {
	\\builtin typeset line x
	\\builtin set -o noglob
	while \\builtin read -r line; do
		while [[ $line = *\\ && $line != *'#'* ]] && \
		    \\builtin read -r x; do
			line=${line%\\}$x
		done
		line=${line%%#*}
		[[ -z $line ]] || \\builtin print -r -- $line
	done
	\:
}

# toggle built-in aliases and utilities, and aliases and functions from mkshrc
function enable {
	\\builtin typeset doprnt=0 mode=1 x y z rv=0
	\\builtin typeset b_alias i_alias i_func nalias=0 nfunc=0 i_all
	\\builtin set -A b_alias
	\\builtin set -A i_alias
	\\builtin set -A i_func

	# accumulate mksh built-in aliases, in ASCIIbetical order
	i_alias[nalias]=autoload; b_alias[nalias++]='\\builtin typeset -fu'
	i_alias[nalias]=functions; b_alias[nalias++]='\\builtin typeset -f'
	i_alias[nalias]=hash; b_alias[nalias++]='\\builtin alias -t'
	i_alias[nalias]=history; b_alias[nalias++]='\\builtin fc -l'
	i_alias[nalias]=integer; b_alias[nalias++]='\\builtin typeset -i'
	i_alias[nalias]=local; b_alias[nalias++]='\\builtin typeset'
	i_alias[nalias]=login; b_alias[nalias++]='\\builtin exec login'
	i_alias[nalias]=nameref; b_alias[nalias++]='\\builtin typeset -n'
	i_alias[nalias]=nohup; b_alias[nalias++]='nohup '
	i_alias[nalias]=r; b_alias[nalias++]='\\builtin fc -e -'
	i_alias[nalias]=type; b_alias[nalias++]='\\builtin whence -v'

	# accumulate mksh built-in utilities, in definition order, even ifndef
	i_func[nfunc++]=.
	i_func[nfunc++]=:
	i_func[nfunc++]='['
	i_func[nfunc++]=alias
	i_func[nfunc++]=break
	# \\builtin cannot, by design, be overridden
	i_func[nfunc++]=builtin
	i_func[nfunc++]=cd
	i_func[nfunc++]=chdir
	i_func[nfunc++]=command
	i_func[nfunc++]=continue
	i_func[nfunc++]=echo
	i_func[nfunc++]=eval
	i_func[nfunc++]=exec
	i_func[nfunc++]=exit
	i_func[nfunc++]=export
	i_func[nfunc++]=false
	i_func[nfunc++]=fc
	i_func[nfunc++]=getopts
	i_func[nfunc++]=jobs
	i_func[nfunc++]=kill
	i_func[nfunc++]=let
	i_func[nfunc++]=print
	i_func[nfunc++]=pwd
	i_func[nfunc++]=read
	i_func[nfunc++]=readonly
	i_func[nfunc++]=realpath
	i_func[nfunc++]=rename
	i_func[nfunc++]=return
	i_func[nfunc++]=set
	i_func[nfunc++]=shift
	i_func[nfunc++]=source
	i_func[nfunc++]=suspend
	i_func[nfunc++]=test
	i_func[nfunc++]=times
	i_func[nfunc++]=trap
	i_func[nfunc++]=true
	i_func[nfunc++]=typeset
	i_func[nfunc++]=ulimit
	i_func[nfunc++]=umask
	i_func[nfunc++]=unalias
	i_func[nfunc++]=unset
	i_func[nfunc++]=wait
	i_func[nfunc++]=whence
	i_func[nfunc++]=bg
	i_func[nfunc++]=fg
	i_func[nfunc++]=bind
	i_func[nfunc++]=mknod
	i_func[nfunc++]=printf
	i_func[nfunc++]=extproc

	# accumulate aliases from dot.mkshrc, in definition order
	i_alias[nalias]=l; b_alias[nalias++]='ls -F'
	i_alias[nalias]=la; b_alias[nalias++]='l -a'
	i_alias[nalias]=ll; b_alias[nalias++]='l -l'
	i_alias[nalias]=lo; b_alias[nalias++]='l -al'
	i_alias[nalias]=doch; b_alias[nalias++]='sudo mksh -c "$(\\builtin fc -ln -1)"'
	i_alias[nalias]=rot13; b_alias[nalias++]='tr abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM'
	i_alias[nalias]=cls; b_alias[nalias++]='\\builtin print -n \\ec'

	# accumulate functions from dot.mkshrc, in definition order
	i_func[nfunc++]=setenv
	i_func[nfunc++]=smores
	i_func[nfunc++]=hd
	i_func[nfunc++]=hd_mksh
	i_func[nfunc++]=which
	i_func[nfunc++]=chpwd
	i_func[nfunc++]=cd
	i_func[nfunc++]=cd_csh
	i_func[nfunc++]=dirs
	i_func[nfunc++]=popd
	i_func[nfunc++]=pushd
	i_func[nfunc++]=Lb64decode
	i_func[nfunc++]=Lb64encode
	i_func[nfunc++]=Lbafh_init
	i_func[nfunc++]=Lbafh_add
	i_func[nfunc++]=Lbafh_finish
	i_func[nfunc++]=Lstripcom
	i_func[nfunc++]=enable

	# collect all identifiers, sorted ASCIIbetically
	\\builtin set -sA i_all -- "${i_alias[@]}" "${i_func[@]}"

	# handle options, we don't do dynamic loading
	while \\builtin getopts "adf:nps" x; do
		case $x {
		(a)
			mode=-1
			;;
		(d)
			# deliberately causing an error, like bash-static
			;|
		(f)
			\\builtin print -ru2 enable: dynamic loading not available
			\\builtin return 2
			;;
		(n)
			mode=0
			;;
		(p)
			doprnt=1
			;;
		(s)
			\\builtin set -sA i_all -- . : break continue eval \
			    exec exit export readonly return set shift times \
			    trap unset
			;;
		(*)
			\\builtin print -ru2 enable: usage: \
			    "enable [-adnps] [-f filename] [name ...]"
			\\builtin return 2
			;;
		}
	done
	\\builtin shift $((OPTIND - 1))

	# display builtins enabled/disabled/all/special?
	if (( doprnt || ($# == 0) )); then
		for x in "${i_all[@]}"; do
			y=$(\\builtin alias "$x") || y=
			[[ $y = "$x='\\\\builtin whence -p $x >/dev/null || (\\\\builtin print -r mksh: $x: not found; \\\\builtin exit 127) && \$(\\\\builtin whence -p $x)'" ]]; z=$?
			case $mode:$z {
			(-1:0|0:0)
				\\builtin print -r -- "enable -n $x"
				;;
			(-1:1|1:1)
				\\builtin print -r -- "enable $x"
				;;
			}
		done
		\\builtin return 0
	fi

	for x in "$@"; do
		z=0
		for y in "${i_alias[@]}" "${i_func[@]}"; do
			[[ $x = "$y" ]] || \\builtin continue
			z=1
			\\builtin break
		done
		if (( !z )); then
			\\builtin print -ru2 enable: "$x": not a shell builtin
			rv=1
			\\builtin continue
		fi
		if (( !mode )); then
			# disable this
			\\builtin alias "$x=\\\\builtin whence -p $x >/dev/null || (\\\\builtin print -r mksh: $x: not found; \\\\builtin exit 127) && \$(\\\\builtin whence -p $x)"
		else
			# find out if this is an alias or not, first
			z=0
			y=-1
			while (( ++y < nalias )); do
				[[ $x = "${i_alias[y]}" ]] || \\builtin continue
				z=1
				\\builtin break
			done
			if (( z )); then
				# re-enable the original alias body
				\\builtin alias "$x=${b_alias[y]}"
			else
				# re-enable the original utility/function
				\\builtin unalias "$x"
			fi
		fi
	done
	\\builtin return $rv
}

\: place customisations below this line

# some defaults / samples which you are supposed to adjust to your
# liking; by default we add ~/.etc/bin and ~/bin (whichever exist)
# to $PATH, set $SHELL to mksh, set some defaults for man and less
# and show a few more possible things for users to begin moving in

for p in ~/.etc/bin ~/bin; do
	[[ -d $p/. ]] || \\builtin continue
	[[ $PATHSEP$PATH$PATHSEP = *"$PATHSEP$p$PATHSEP"* ]] || \
	    PATH=$p$PATHSEP$PATH
done

\\builtin export SHELL=$MKSH MANWIDTH=80 LESSHISTFILE=-
\\builtin alias cls='\\builtin print -n \\ec'

#\\builtin unset LC_ADDRESS LC_COLLATE LC_CTYPE LC_IDENTIFICATION \
#    LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER \
#    LC_TELEPHONE LC_TIME LANGUAGE LANG LC_ALL
#p=en_GB.UTF-8
#\\builtin export LANG=C LC_CTYPE=$p LC_MEASUREMENT=$p LC_MESSAGES=$p LC_PAPER=$p
#\\builtin export LANG=C.UTF-8 LC_CTYPE=C.UTF-8
#\\builtin export LC_ALL=C.UTF-8
#\\builtin set -U
#[[ ${LC_ALL:-${LC_CTYPE:-${LANG:-}}} = *[Uu][Tt][Ff]?(-)8* ]] || \\builtin set +U

\\builtin unset p

\: place customisations above this line