#!/bin/sh
#
# This file is in the public domain.

set -o errexit
LC_ALL=C

ident='$FreeBSD$'

t=$(mktemp -d -t makeman)
trap 'test -d $t && rm -rf $t' exit

srcdir=$(realpath ../../..)
make="make -C $srcdir -m $srcdir/share/mk"

#
# usage: no_targets all_targets yes_targets
#
no_targets()
{
	for t1 in $1 ; do
		for t2 in $2 ; do
			if [ "${t1}" = "${t2}" ] ; then
				continue 2
			fi
		done
		echo ${t1}
	done
}

show_options()
{
	ALL_TARGETS=$(echo $(${make} targets | tail -n +2))
	rm -f $t/settings
	for target in ${ALL_TARGETS} ; do
		${make} showconfig \
		    SRCCONF=/dev/null __MAKE_CONF=/dev/null \
		    TARGET_ARCH=${target#*/} TARGET=${target%/*} |
		while read var _ val ; do
			opt=${var#MK_}
			case ${val} in
			yes)
				echo ${opt} ${target}
				;;
			no)
				echo ${opt}
				;;
			*)
				echo 'make showconfig broken' >&2
				exit 1
				;;
			esac
		done > $t/settings.target
		if [ -r $t/settings ] ; then
			join -t\  $t/settings $t/settings.target > $t/settings.new
			mv $t/settings.new $t/settings
		else
			mv $t/settings.target $t/settings
		fi
	done

	cat $t/settings | while read opt targets ; do
		if [ "${targets}" = "${ALL_TARGETS}" ] ; then
			echo "WITHOUT_${opt}"
		elif [ -z "${targets}" ] ; then
			echo "WITH_${opt}"
		else
			echo "WITHOUT_${opt}" $(no_targets "${ALL_TARGETS}" "${targets}")
			echo "WITH_${opt} ${targets}"
		fi
	done
}

#
# usage: show { settings | with | without } ...
#
show()
{

	mode=$1 ; shift
	case ${mode} in
	settings)
		yes_prefix=WITH
		no_prefix=WITHOUT
		;;
	with)
		yes_prefix=WITH
		no_prefix=WITH
		;;
	without)
		yes_prefix=WITHOUT
		no_prefix=WITHOUT
		;;
	*)
		echo 'internal error' >&2
		exit 1
		;;
	esac
	${make} "$@" showconfig __MAKE_CONF=/dev/null |
	while read var _ val ; do
		opt=${var#MK_}
		case ${val} in
		yes)
			echo ${yes_prefix}_${opt}
			;;
		no)
			echo ${no_prefix}_${opt}
			;;
		*)
			echo 'make showconfig broken' >&2
			exit 1
			;;
		esac
	done
}

main()
{

	ident=${ident#$}
	ident=${ident% $}
	fbsdid='$'FreeBSD'$'
	cat <<EOF
.\" DO NOT EDIT-- this file is automatically generated.
.\" from ${ident}
.\" ${fbsdid}
.Dd $(echo $(LC_TIME=C date +'%B %e, %Y'))
.Dt SRC.CONF 5
.Os
.Sh NAME
.Nm src.conf
.Nd "source build options"
.Sh DESCRIPTION
The
.Nm
file contains settings that will apply to every build involving the
.Fx
source tree; see
.Xr build 7 .
.Pp
The
.Nm
file uses the standard makefile syntax.
However,
.Nm
should not specify any dependencies to
.Xr make 1 .
Instead,
.Nm
is to set
.Xr make 1
variables that control the aspects of how the system builds.
.Pp
The default location of
.Nm
is
.Pa /etc/src.conf ,
though an alternative location can be specified in the
.Xr make 1
variable
.Va SRCCONF .
Overriding the location of
.Nm
may be necessary if the system-wide settings are not suitable
for a particular build.
For instance, setting
.Va SRCCONF
to
.Pa /dev/null
effectively resets all build controls to their defaults.
.Pp
The only purpose of
.Nm
is to control the compilation of the
.Fx
source code, which is usually located in
.Pa /usr/src .
As a rule, the system administrator creates
.Nm
when the values of certain control variables need to be changed
from their defaults.
.Pp
In addition, control variables can be specified
for a particular build via the
.Fl D
option of
.Xr make 1
or in its environment; see
.Xr environ 7 .
.Pp
The values of variables are ignored regardless of their setting;
even if they would be set to
.Dq Li FALSE
or
.Dq Li NO .
Just the existence of an option will cause
it to be honoured by
.Xr make 1 .
.Pp
The following list provides a name and short description for variables
that can be used for source builds.
.Bl -tag -width indent
EOF
	show settings SRCCONF=/dev/null | sort > $t/config_default
	# Work around WITH_LDNS_UTILS forcing BIND_UTILS off by parsing the
	# actual config that results from enabling every WITH_ option.  This
	# can be reverted if/when we no longer have options that disable
	# others.
	show with SRCCONF=/dev/null | sort | sed 's/$/=/' > $t/src.conf
	show settings SRCCONF=$t/src.conf | sort > $t/config_WITH_ALL
	show without SRCCONF=/dev/null | sort > $t/config_WITHOUT_ALL

	show_options |
	while read opt targets ; do
		if [ ! -f ${opt} ] ; then
			echo "no description found for ${opt}, skipping" >&2
			continue
		fi

		echo ".It Va ${opt}"
		sed -e's/\$\(FreeBSD: .*\) \$/from \1/' ${opt}
		if [ -n "${targets}" ] ; then
			echo '.Pp'
			echo 'It is a default setting on'
			echo $(echo ${targets} | sed -e's/ /, /g' -e's/\(.*\), /\1 and /').
		fi

		if [ "${opt%%_*}" = 'WITHOUT' ] ; then
			sed -n "/^WITH_${opt#WITHOUT_}$/!s/$/=/p" $t/config_WITH_ALL > $t/src.conf
			show settings SRCCONF=$t/src.conf -D${opt} | sort > $t/config_WITH_ALL_${opt}
			comm -13 $t/config_WITH_ALL $t/config_WITH_ALL_${opt} | sed -n "/^${opt}$/!p" > $t/deps
		elif [ "${opt%%_*}" = 'WITH' ] ; then
			sed -n "/^WITHOUT${opt#WITH}$/!s/$/=/p" $t/config_WITHOUT_ALL > $t/src.conf
			show settings SRCCONF=$t/src.conf -D${opt} | sort > $t/config_WITHOUT_ALL_${opt}
			comm -13 $t/config_WITHOUT_ALL $t/config_WITHOUT_ALL_${opt} | sed -n "/^${opt}$/!p" > $t/deps
		else
			echo 'internal error' >&2
			exit 1
		fi

		show settings SRCCONF=/dev/null -D${opt} | sort > $t/config_${opt}
		comm -13 $t/config_default $t/config_${opt} | sed -n "/^${opt}$/!p" |
		comm -13 $t/deps - > $t/deps2

		# Work around BIND_UTILS=no being the default when every WITH_
		# option is enabled.
		if [ "$(cat $t/deps2)" = WITHOUT_BIND_UTILS ]; then
			sort $t/deps $t/deps2 > $t/_deps
			mv $t/_deps $t/deps
			:> $t/deps2
		fi

		if [ -s $t/deps ] ; then
			echo 'When set, it also enforces the following options:'
			echo '.Pp'
			echo '.Bl -item -compact'
			cat $t/deps | while read opt2 ; do
				echo '.It'
				echo ".Va ${opt2}"
			done
			echo '.El'
		fi

		if [ -s $t/deps2 ] ; then
			if [ -s $t/deps ] ; then
				echo '.Pp'
			fi
			echo 'When set, the following options are also in effect:'
			echo '.Pp'
			echo '.Bl -inset -compact'
			cat $t/deps2 | while read opt2 ; do
				echo ".It Va ${opt2}"
				noopt=$(echo ${opt2} | sed -e's/WITH_/WITHOUT_/;t' -e's/WITHOUT_/WITH_/')
				echo '(unless'
				echo ".Va ${noopt}"
				echo 'is set explicitly)'
			done
			echo '.El'
		fi
		twiddle >&2
	done
	cat <<EOF
.El
.Sh FILES
.Bl -tag -compact -width Pa
.It Pa /etc/src.conf
.It Pa /usr/share/mk/bsd.own.mk
.El
.Sh SEE ALSO
.Xr make 1 ,
.Xr make.conf 5 ,
.Xr build 7 ,
.Xr ports 7
.Sh HISTORY
The
.Nm
file appeared in
.Fx 7.0 .
.Sh AUTHORS
This manual page was autogenerated.
EOF
}

twiddle_pos=0
twiddle()
{
	local c0='|' c1='/' c2='-' c3='\'

	eval printf '%c\\b' '$c'${twiddle_pos}
	twiddle_pos=$(((twiddle_pos+1)%4))
}

main