install.sh

#! /bin/sh

# Interactive installer for modernish.
# https://github.com/modernish/modernish
#
# This installer is itself an example of a modernish script (from '. modernish' on).
# For more conventional examples, see share/doc/modernish/examples
#
# --- begin license ---
# Copyright (c) 2019 Martijn Dekker <martijn@inlv.org>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
# --- end license ---

min_posix='cd -P -- / && ! { ! case x in ( x ) : ${0##*/} || : $( : ) ;; esac; }'
if (eval "$min_posix") 2>/dev/null; then
	unset -v min_posix
else
	# this is an ancient Bourne shell (e.g. Solaris 10)
	sh -c "$min_posix" 2>/dev/null && exec sh -- "$0" ${1+"$@"}
	DEFPATH=`getconf PATH` 2>/dev/null || DEFPATH=/usr/xpg4/bin:/bin:/usr/bin:/sbin:/usr/sbin
	PATH=$DEFPATH:$PATH
	export PATH
	sh -c "$min_posix" 2>/dev/null && exec sh -- "$0" ${1+"$@"}
	echo "$0: Can't escape from obsolete shell. Run me with a POSIX shell." >&2
	exit 128
fi

case ${MSH_VERSION+s} in
( s )	echo "The modernish installer cannot be run by modernish itself." >&2
	exit 128 ;;
esac

# semi-safe mode (compatible with broken shells)
set -o noglob +o noclobber +o nounset +o errexit +o allexport
IFS='
'

# find my own absolute and physical directory path
unset -v CDPATH
case $0 in
( */* )	MSH_PREFIX=${0%/*} ;;
( * )	MSH_PREFIX=. ;;
esac
case $MSH_PREFIX in
( */* | [!+-]* | [+-]*[!0123456789]* )
	MSH_PREFIX=$(cd -P -- "$PWD" && cd -- "$MSH_PREFIX" && pwd -P && echo X) ;;
( * )	MSH_PREFIX=$(cd -P -- "$PWD" && cd "./$MSH_PREFIX" && pwd -P && echo X) ;;
esac || exit
MSH_PREFIX=${MSH_PREFIX%?X}

# put the shell in standards mode
. "$MSH_PREFIX/lib/modernish/aux/std.sh"

# ensure sane default permissions
umask 022

# disable core dumps (some tested shells may crash)
ulimit -c 0 2>/dev/null

showusage() {
	echo "usage: $0 [ -nf ] [ -s SHELL ] [ -P PATH ] \\"
	echo "	[ -d INSTALLROOT ] [ -D PREFIX ] [ -B ] [ SCRIPTFILE ... ]"
	echo "	-n: non-interactive operation"
	echo "	-s: specify default shell to execute modernish"
	echo "	-f: force unconditional installation on specified shell"
	echo "	-P: specify alternative DEFPATH (be careful!)"
	echo "	-d: specify root directory for installation"
	echo "	-D: extra destination directory prefix (for packagers)"
	echo "	-B: bundle modernish with your scripts (-D required, -n implied)"
} 1>&2

# parse options
unset -v opt_relaunch opt_n opt_f opt_B opt_s DEFPATH opt_d opt_D
case ${1-} in
( --relaunch )
	opt_relaunch=''
	shift ;;
( * )	unset -v MSH_SHELL ;;
esac
while getopts 'nfs:P:d:D:B' opt; do
	case $opt in
	( \? )	showusage; exit 1 ;;
	( n )	opt_n='' ;;
	( f )	opt_f='' ;;
	( s )	opt_s=$OPTARG ;;
	( P )	DEFPATH=$OPTARG ;;
	( d )	opt_d=$OPTARG ;;
	( D )	opt_D=$OPTARG ;;
	( B )	opt_B='' ;;
	esac
done

# if -s given, relaunch
case ${opt_s+s} in
( s )	OPTARG=$opt_s
	opt_s=$(command -v "$opt_s")
	if ! test -x "$opt_s"; then
		echo "$0: shell not found: $OPTARG" >&2
		exit 1
	fi
	case ${MSH_SHELL-} in
	( "$opt_s" ) ;;
	( * )	MSH_SHELL=$opt_s
		export MSH_SHELL
		echo "Relaunching ${0##*/} with $MSH_SHELL..." >&2
		exec "$MSH_SHELL" "$MSH_PREFIX/${0##*/}" --relaunch "$@" ;;
	esac ;;
esac

# determine and/or validate DEFPATH
. "$MSH_PREFIX/lib/modernish/aux/defpath.sh" || exit
export DEFPATH

# find a compliant POSIX shell
case ${MSH_SHELL-} in
( '' )	MSH_SHELL=$(PATH=$DEFPATH; command -v sh)	# for installation, default to sh
	. "$MSH_PREFIX/lib/modernish/aux/goodsh.sh" || exit
	case ${opt_n+n}${opt_B+B} in
	( n )	# If we're non-interactive and not bundling, relaunch early so that our shell is known.
		echo "Relaunching ${0##*/} with $MSH_SHELL..." >&2
		exec "$MSH_SHELL" "$MSH_PREFIX/${0##*/}" --relaunch "$@" ;;
	esac
	case $(command . "$MSH_PREFIX/lib/modernish/aux/fatal.sh" || echo BUG) in
	( "${PPID:-no_match_on_no_PPID}" ) ;;
	( * )	echo "Bug attack! Abandon shell!" >&2
		echo "Relaunching ${0##*/} with $MSH_SHELL..." >&2
		exec "$MSH_SHELL" "$MSH_PREFIX/${0##*/}" "$@" ;;	# no --relaunch or we'll skip the menu
	esac ;;
esac

# load modernish and some modules
. "$MSH_PREFIX/bin/modernish"
use safe				# IFS=''; set -f -u -C
use var/arith
use var/loop/find -b			# '-b' allows compatibility mode for obsolete/broken 'find' util
use var/shellquote
use var/string
use sys/base/mktemp
use sys/base/readlink
use sys/base/which
use sys/cmd/extern
use sys/cmd/harden

# abort program if any of these commands give an error
# (the default error condition is '> 0', exit status > 0;
# for some commands, such as grep, this is different)
# also make sure the system default path is used to find them (-p)
harden -p cat
harden -p -t mkdir
harden -p chmod
harden -p ln
harden -p -e '> 1' LC_ALL=C grep
harden -p sed
harden -p sort
harden -p paste
harden -p fold -w $(( ${COLUMNS:-80} - 1 ))  # make 'fold' use window size by default
harden -p -e '> 4' tput
harden -p mkfifo
isset opt_B && harden -p -t patch
isset opt_B && harden -p -t rm


# End of modernish initialisation; from now on, it's a proper modernish script.
#
# (Does the script below seem like it makes lots of newbie mistakes with not
# quoting variables and glob patterns? Think again! Using the 'safe' module
# disables field splitting and globbing, along with all their hazards: most
# variable quoting is unnecessary and glob patterns can be passed on to
# commands such as 'match' without quoting. The new modernish loop construct
# is used to split or glob values instead, without enabling field splitting
# or globbing at any point in the code. No quoting headaches here!)

# Validate a shell path input by a user.
validate_msh_shell() {
	str empty $msh_shell && return 1
	push REPLY
	which -s $msh_shell || {
		putln "$msh_shell not found or not executable. Please try again."
		return 1
	}
	msh_shell=$REPLY
	pop REPLY
	if str match $msh_shell *[!$SHELLSAFECHARS]*; then
		putln "The path '$msh_shell' contains" \
			"non-shell-safe characters. Try another path."
		return 1
	elif not str eq $$ $(PATH=$DEFPATH exec $msh_shell -c '. "$1" && v=$(command . "$2" || echo BUG) && echo "$v"' \
				$msh_shell $MSH_AUX/std.sh $MSH_AUX/fatal.sh)
	then
		putln "$msh_shell was found unable to run modernish. Try another."
		return 1
	fi
} >&2

# function that lets the user choose a shell from /etc/shells or provide their own path,
# verifies that the shell can run modernish, then relaunches the script with that shell
pick_shell_and_relaunch() {
	clear_eol=$(tput el || tput ce)	# clear to end of line (terminfo or termcap)

	# find shells, eliminating non-compatible shells
	shells_to_test=$(
		{
			which -aq sh ash dash gwsh zsh5 zsh yash bash ksh ksh93 lksh mksh oksh pdksh
			if is -L reg /etc/shells && can read /etc/shells; then
				grep -E '/([bdy]?a|gw|pdk|[mlo]?k|z)?sh[0-9._-]*$' /etc/shells
			fi
		} | sort -u
	)
	valid_shells=''
	LOOP for --split=$CCn msh_shell in $shells_to_test; DO
		put "${CCr}Testing shell $msh_shell...$clear_eol"
		validate_msh_shell 2>/dev/null && append --sep=$CCn valid_shells $msh_shell
	DONE
	if str empty $valid_shells; then
		putln "${CCr}No POSIX-compliant shell found. Please specify one.$clear_eol"
		msh_shell=
		while not validate_msh_shell; do
			put "Shell command name or path: "
			read msh_shell || exit 2 "Aborting."
		done
	else
		putln "${CCr}Please choose a default shell for executing modernish scripts.$clear_eol" \
			"Either pick a shell from the menu, or enter the command name or path" \
			"of another POSIX-compliant shell at the prompt."
		PS3='Shell number, command name or path: '
		LOOP select --split=$CCn msh_shell in $valid_shells; DO
			if str empty $msh_shell; then
				if str isint $REPLY; then
					putln "Out of range." >&2
					continue
				fi
				# a path or command instead of a number was given
				msh_shell=$REPLY
				validate_msh_shell && break
			else
				# a number was chosen: already tested, so assume good
				break
			fi
		DONE || exit 2 "Aborting."  # user pressed ^D
	fi

	putln "* Relaunching installer with $msh_shell" ''
	export MSH_SHELL=$msh_shell
	exec $msh_shell $MSH_PREFIX/${0##*/} --relaunch "$@"
}

# Simple function to ask a question of a user.
yesexpr=$(PATH=$DEFPATH command locale yesexpr 2>/dev/null) && yesexpr="($yesexpr)|^[yY]" || yesexpr='^[yY]'
noexpr=$(PATH=$DEFPATH command locale noexpr 2>/dev/null) && noexpr="($noexpr)|^[nN]" || noexpr='^[nN]'
ask_q() {
	REPLY=''
	while not str ematch $REPLY "$yesexpr|$noexpr"; do
		put "$1 (y/n) "
		read -r REPLY || exit 2 'Aborting.'
	done
	str ematch $REPLY $yesexpr
}

# Function to generate arguments for 'unalias' for interactive shells and 'readonly -f' for bash and yash.
mk_readonly_f() {
	sed -n 's/^[[:blank:]]*\([a-zA-Z_][a-zA-Z_]*\)()[[:blank:]]*{.*/\1/p
		s/^[[:blank:]]*eval '\''\([a-zA-Z_][a-zA-Z_]*\)()[[:blank:]]*{.*/\1/p' \
			$1 |
		grep -Ev '(^echo$|^_Msh_initExit$|^_Msh_test|^_Msh_tmp)' |
		sort -u |
		paste -sd' ' - |
		fold -sw64 |
		sed "s/^/${CCt}${CCt}/; \$ !s/\$/\\\\/"
}

# Helper function to install one file and report its installation.
# Usage: install_file SRC DEST [ SEDSCRIPT ]
install_file() {
	if not str begin $1 '/' && not str eq $1 '-'; then
		rel_path=$1
		shift
		set -- $MSH_PREFIX/$rel_path "$@"
	else
		unset -v rel_path
	fi
	is present $2 && exit 3 "Error: '$2' already exists, refusing to overwrite"
	# Check if we're bundling, and not reading from stdin.
	if isset opt_B && isset rel_path; then
		# Prefix sed script to strip comments. Keep tag comments like # @FOO_BAR@.
		# (Note: scripts to be installed must not contain ' # ' in string literals; can escape, e.g. " #\ ")
		set -- $1 $2 '	/#.*@['${ASCIIALNUM}_']@/ n
				/^#$/ d
				/^#[[:blank:]]/ d
				s/[[:blank:]]\{1,\}#[[:blank:]].*//
			'${3:-}
		# Check if there's a patch to apply for bundling.
		diff=$MSH_PREFIX/lib/_install/$rel_path.bundle.diff
		if can read $diff; then
			tmpfile=$rel_path
			replacein -a tmpfile '/' ':'
			tmpfile=$tmpdir/patched:$tmpfile
			patch -i $diff -o $tmpfile $1
			shift
			set -- $tmpfile "$@"	# replace patched file as input
		fi
	fi
	is -L dir ${2%/*} || mkdir -p ${2%/*}
	case $# in
	( 2 )	cat $1 ;;   # supports '-' for stdin
	( 3 )	str eq $1 '-' && sed $3 || sed $3 $1 ;;
	esac > $2 || die "can't create $2"
	read -r hb < $2 || die "can't read from $2"
	if str begin $hb '#!' && hb=${hb#*/} && can exec /${hb%%[$WHITESPACE]*}; then
		chmod +x $2
		putln "- Installed: $2 (hashbang path: /$hb)"
	else
		putln "- Installed: $2"
	fi
}

# Define a function to check if a file is to be ignored/skipped.
if command -v git >/dev/null && (chdir $MSH_PREFIX; exec git check-ignore --quiet foo~ 2>/dev/null); then
	# If we're installing from git repo, make is_ignored() ask git to check against .gitignore.
	is_ignored() {
		(chdir $MSH_PREFIX; exec git check-ignore --quiet -- "$1") || { let "$? > 1" && die "is_ignored: git failed"; }
	}
else
	is_ignored() {
		case $1 in
		( "$MSH_PREFIX"/_* | */.* | *~ | *.bak | *.orig | *.rej ) ;;
		( * )	return 1 ;;
		esac
	}
fi


# --- Main ---

shift $((OPTIND - 1))	# shift out all options, leaving script arguments if bundling (-B)

if isset opt_B; then
	isset opt_P && exit 1 "option -B is incompatible with -P"
	isset opt_D || exit -u 1 "option -B requires option -D"
	let "$#" || exit -u 1 "option -B requires specifying one or more script arguments"
	for script do
		is -L reg $script && can read $script || exit 1 "can't find script to bundle: $script"
	done
	opt_n=''  # no interactivity when bundling
else
	let "$#" && exit -u 1 "specifying script arguments requires -B"
fi

if isset opt_D; then
	# ensure destdir is absolute and physical
	readlink -s -m "$opt_D" || die "internal error canonicalising destdir"
	opt_D=$REPLY
fi

if isset opt_n || isset opt_s || isset opt_relaunch; then
	msh_shell=$MSH_SHELL
	validate_msh_shell || exit
	MSH_SHELL=$msh_shell
	putln "* Modernish version $MSH_VERSION, now running on $msh_shell".
	not isset opt_B && . $MSH_AUX/id.sh
else
	putln "* Welcome to modernish version $MSH_VERSION."
	. $MSH_AUX/id.sh
	pick_shell_and_relaunch "$@"
fi

if not isset opt_B || isset opt_s; then
	putln "* Running regression test suite on $msh_shell ..."
	if $msh_shell $MSH_PREFIX/bin/modernish --test -eqq; then
		putln "* Tests passed. No bugs in modernish were detected."
	elif isset opt_n && not isset opt_f; then
		putln "* ERROR: modernish has some bug(s) in combination with this shell." \
		      "         Add the '-f' option to install with this shell anyway." >&2
		exit 1
	else
		putln "* WARNING: modernish has some bug(s) in combination with this shell." \
		      "           Run 'modernish --test' after installation for more details."
	fi

	if isset BASH_VERSION && str match $BASH_VERSION [34].*; then
		putln "  Note: bash before 5.0 is much slower than other shells. If performance" \
		      "  is important to you, it is recommended to pick another shell."
	fi
fi

if not isset opt_n && not isset opt_f; then
	ask_q "Are you happy with $msh_shell as the default shell?" \
	|| pick_shell_and_relaunch ${opt_d+-d$opt_d} ${opt_D+-D$opt_D}
fi

while not isset installroot; do
	if not isset opt_n && not isset opt_d; then
		putln "* Enter the directory prefix for installing modernish."
	fi
	if isset opt_d; then
		installroot=$opt_d
	elif isset opt_B; then
		installroot='/bndl'
	elif isset opt_D || { is -L dir /usr/local && can write /usr/local; }; then
		if isset opt_n; then
			installroot=/usr/local
		else
			putln "  Just press 'return' to install in /usr/local."
			put "Directory prefix: "
			read -r installroot || exit 2 Aborting.
			str empty $installroot && installroot=/usr/local
		fi
	else
		if isset opt_n; then
			installroot=
		else
			putln "  Just press 'return' to install in your home directory."
			put "Directory prefix: "
			read -r installroot || exit 2 Aborting.
		fi
		if str empty $installroot; then
			# Installing in the home directory may not be as straightforward
			# as simply installing in ~/bin. Search $PATH to see if the
			# install prefix should be a subdirectory of ~.
			# Note: '--split=:' splits $PATH on ':' without activating split within the loop.
			LOOP for --split=: p in $PATH; DO
				str begin $p / || continue
				is -L dir $p && can write $p || continue
				str begin $(chdir -P -- ${opt_D-}/$p; put $PWD/) $MSH_PREFIX/ && continue
				if str eq $p ~/bin || str match $p ~/*/bin
				then #	     ^^^^^		   ^^^^^^^ note: tilde expansion, but no globbing
					installroot=${p%/bin}
					break
				fi
			DONE
			if str empty $installroot; then
				installroot=~
				putln "* WARNING: $installroot/bin is not in your PATH."
			fi
		fi
	fi
	# Canonicalise.
	if isset opt_D; then
		readlink -s -m $opt_D/$installroot || die 'internal error 1'
		str eq $REPLY $opt_D$installroot || putln "Canonicalising '$installroot' to '${REPLY#"$opt_D"}'." | fold -s
		if not str begin $REPLY $opt_D; then
			putln "Canonicalised path '$REPLY' is not within destdir '$opt_D'. Please try again." | fold -s >&2
			isset opt_n && exit 1
			unset -v installroot opt_d
			continue
		fi
		installroot=${REPLY#"$opt_D"}
	else
		readlink -s -m $installroot || die 'internal error 2'
		str eq $REPLY $installroot || putln "Canonicalising '$installroot' to '$REPLY'." | fold -s
		installroot=$REPLY
	fi
	# Verify existence.
	if str begin $REPLY/ $MSH_PREFIX/; then
		putln "The path '${opt_D-}$installroot' is within the source directory '$MSH_PREFIX'. Choose another." | fold -s >&2
		isset opt_n && exit 1
		unset -v installroot opt_d
		continue
	elif not is present ${opt_D-}$installroot; then
		if isset opt_D || { not isset opt_n && ask_q "${opt_D-}$installroot doesn't exist yet. Create it?"; }; then
			mkdir -p ${opt_D-}$installroot
		elif isset opt_n; then
			exit 1 "${opt_D-}$installroot doesn't exist."
		else
			unset -v installroot opt_d
			continue
		fi
	elif not is -L dir ${opt_D-}$installroot; then
		putln "${opt_D-}$installroot is not a directory. Please try again." | fold -s >&2
		isset opt_n && exit 1
		unset -v installroot opt_d
		continue
	fi
	# Check for shell-safe path.
	if not isset opt_B && str match $installroot *[!$SHELLSAFECHARS]*; then
		putln "The path '$installroot' contains non-shell-safe characters. Please try again." | fold -s >&2
		if isset opt_n || isset opt_D; then
			exit 1
		fi
		unset -v installroot opt_d
		continue
	fi
	# If installing in root dir, avoid concatenation creating initial double slash (UNC/Cygwin compat).
	if str eq $installroot /; then
		installroot=/.
	fi
done

# --- Begin installation ---

mktemp -dtsCC modernish-install; tmpdir=$REPLY	# use mktemp with auto-cleanup from sys/base/mktemp module

compatdir=lib/modernish/bin
if not isset opt_B; then
	mkdir -p ${opt_D-}$installroot/$compatdir

	# Ensure the sh found in $DEFPATH after installation is our known-good shell.
	ln -sf $msh_shell ${opt_D-}$installroot/$compatdir/sh
	putln "- Installed sh symlink: ${opt_D-}$installroot/$compatdir/sh -> $msh_shell"

	# Some shells are more POSIX compliant if launched as sh, in ways that cannot be achieved with
	# 'set -o posix' or 'emulate sh' after launching; so use the compat symlink as $MSH_SHELL.
	msh_shell=$installroot/$compatdir/sh

	# Solaris doesn't come with the required external '[' command, so something like
	#	find dir -exec [ -p {} ] \; -print
	# fails to work as the standard prescribes. Add a '[' to DEFPATH.
	if ! extern -pv [ >/dev/null && testcmd=$(extern -pv test); then
		ln -s $testcmd $installroot/$compatdir/[
		if $installroot/$compatdir/[ 1 -eq 1 ] 2>/dev/null; then
			putln "- Installed missing external '[': $installroot/$compatdir/["
		else
			PATH=$DEFPATH command rm $installroot/$compatdir/[
		fi
	fi
fi

# Traverse through the source directory, installing files as we go.
LOOP find F in $MSH_PREFIX \
	-type d '(' -path $MSH_PREFIX/_* -or -name .* -or -path $MSH_PREFIX/lib/_install ')' -prune \
	-or -type f -iterate
DO
	F=${F#"$MSH_PREFIX/"}	# make path relative
	if isset opt_B; then	# Bundling: skip all these
		case $F in
		( lib/modernish/tst/* | lib/modernish/aux/id.sh | share/doc/modernish/* | *.md )
			continue ;;
		esac
	fi
	if is_ignored $F; then
		continue
	fi
	destfile=${opt_D-}$installroot/$F
	case $F in
	( lib/modernish/aux/goodsh.sh | lib/modernish/aux/defpath.sh )
		# Unless we're bundling, we won't need these after installation
		isset opt_B && install_file $F $destfile
		;;
	( bin/modernish )
		mk_readonly_f $MSH_PREFIX/$F >$tmpdir/readonly_f.sh || die
		script="/@ROFUNC@/	{	r $tmpdir/readonly_f.sh
						d;	}
			/^#readonly MSH_/ {	s/^#//
						s/[[:blank:]]*#.*//;	}"
		if isset opt_B; then
			script="$script
			/^[[:blank:]]*\"Not installed. Run install\\.sh/ s/\\(.*\\)\".*\"/\\1\"Bundled version. Not for general use.\"/"
		else
			hashbang="#! $msh_shell"
			isset BASH_VERSION && hashbang="$hashbang -p"  # don't inherit exported functions in portable-form scripts
			shellquote -P defpath_q=$installroot/$compatdir:$DEFPATH
			putln "DEFPATH=$defpath_q" >$tmpdir/DEFPATH.sh || die			# hardcode $DEFPATH
			script="$script
			1 s|.*|$hashbang|
			/^MSH_PREFIX=/ s|=.*|=$installroot|
			/MSH_AUX\\/goodsh\\.sh\"/ s|.*|MSH_SHELL=$msh_shell|
			/MSH_AUX\\/defpath\\.sh\"/ {
				r $tmpdir/DEFPATH.sh
				d
			}
			/^[[:blank:]]*\"Not installed. Run install\\.sh/ d"
		fi
		install_file $F $destfile $script
		;;
	( "$compatdir"/diff.inactive )
		isset opt_B && continue
		# Determine if we have a 'diff' that refuses to read from FIFOs.
		# On Solaris, 'diff' simply never returns any differences, but on AIX 7.1, 'diff'
		# hangs when trying to read from FIFOs. So we need a test with a timeout.
		mkfifo $tmpdir/f1 $tmpdir/f2
		putln one >$tmpdir/f1 &
		putln two >$tmpdir/f2 &
		PATH=$DEFPATH command diff $tmpdir/f1 $tmpdir/f2 >/dev/null &
		diffpid=$!
		(PATH=$DEFPATH command sleep 1 || die; kill -9 $diffpid >/dev/null 2>&1) &
		wait $diffpid
		if let "$? == 1"; then
			# difference found: wrapper script not needed
			continue
		fi
		shellquote -P defpath_q=$DEFPATH
		putln "PATH=$defpath_q" >$tmpdir/diff_path.sh || die
		install_file $F ${destfile%.inactive} \
		"	1		s|.*|#! $msh_shell|
			/^PATH=/	{ r $tmpdir/diff_path.sh
					  d; }
		"
		;;
	( "$compatdir"/tput.inactive )
		isset opt_B && continue
		# Determine if we have a 'tput' that still uses old termcap codes (FreeBSD).
		if PATH=$DEFPATH TERM=xterm command tput setaf 1 >/dev/null 2>&1 \
		|| ! PATH=$DEFPATH TERM=xterm command tput AF 1 >/dev/null 2>&1; then
			# terminfo code succeeded, or termcap code failed: wrapper script not needed
			continue
		fi
		systput=$(extern -pv tput) || die "internal error: tput gone?"
		shellquote -P systput
		putln "systput=$systput" >$tmpdir/systput.sh || die
		install_file $F ${destfile%.inactive} \
		"	1		s|.*|#! $msh_shell|
			/^systput=/	{ r $tmpdir/systput.sh
					  d; }
		"
		;;
	( */* )
		install_file $F $destfile
		;;
	( *.md | [$ASCIIUPPER][$ASCIIUPPER]* )
		# a top-level documentation file
		not isset opt_B && install_file $F ${opt_D-}$installroot/share/doc/modernish/$F
		;;
	# ignore other files at top level
	esac
DONE

if isset opt_B; then
	. $MSH_PREFIX/lib/_install/bundle_wrapup.sh || die
	put "${CCn}Modernish $MSH_VERSION has been bundled successfully with your script(s)." \
		"You should now add any missing extra files, test-run, and check things over before packaging it.${CCn}" | fold -s
else
	putln '' "Modernish $MSH_VERSION installed successfully with default shell $msh_shell." \
		"Be sure $installroot/bin is in your \$PATH before starting."
fi