#! /bin/sh
#
# modconfig
#
# Copyright (C) 2000 - 2011 Eggheads Development Team
# Written by Fabian Knittel
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
# $Id: modconfig,v 1.21 2011/02/13 14:19:33 simple Exp $


mc_pn=`echo $0 | sed -e 's/^.*\///'`
mc_top_srcdir=
mc_srcdir=
mc_bindir=.

mc_flag_quiet=no
mc_flag_onlynew=no


#  Read options
while true; do
	case ${1} in
	--top_srcdir=*)
		mc_top_srcdir=`echo ${1} | sed -e 's/^--top_srcdir=//'`
	;;
	--top_srcdir)
		shift
		mc_top_srcdir=${1}
	;;
	--srcdir=*)
		mc_srcdir=`echo ${1} | sed -e 's/^--srcdir=//'`
	;;
	--srcdir)
		shift
		mc_srcdir=${1}
	;;
	--bindir=*)
		mc_bindir=`echo ${1} | sed -e 's/^--bindir=//'`
	;;
	--bindir)
		shift
		mc_bindir=${1}
	;;
	--quiet|-q)
		mc_flag_quiet=yes
	;;
	--only-new|-n)
		mc_flag_onlynew=yes
	;;
	--*)
		echo "${mc_pn}: warning: unknown option \`${1}'." 2>&1
	;;
	*)
		#  Non-option parameter.
		break
	;;
	esac

	#  Break out of loop if there are no more arguments to process.
	if shift; then
		:
	else
		break;
	fi
done

#  Find srcdir and top_srcdir
if test "x${mc_srcdir}" = x; then
	if test "x${mc_top_srcdir}" != x; then
		mc_srcdir=${mc_top_srcdir}/src
	else
		echo "${mc_pn}: error: could not find src directory." 2>&1
		exit 1
	fi
fi
if test "x${mc_top_srcdir}" = x; then
	if test "x${mc_srcdir}" != x; then
		mc_top_srcdir=${mc_srcdir}/..
	else
		echo "${mc_pn}: error: could not find top src directory." 2>&1
		exit 1
	fi
fi


#
#  Files
#

#  List of all selected modules (including the `.mod' at the end)
mc_fmodules=${mc_bindir}/.modules

#  List of all modules we have detected so far.
mc_fknownmods=${mc_bindir}/.known_modules

#  List of modules disabled by default
mc_fdisabledmods=${mc_top_srcdir}/disabled_modules

mc_mod_dir=${mc_srcdir}/mod

mc_mod_bin_dir=${mc_bindir}/src/mod
mc_fMakefile=${mc_mod_bin_dir}/Makefile

mc_fstatic_h=${mc_mod_dir}/static.h


#  File descriptor usage:
#    1  Standard output
#    2  Errors
#
#    6  Misc messages and warnings
#    7  Goes to /dev/null
exec 7>/dev/null
if test "${mc_flag_quiet}" = yes; then
	exec 6>&7
else
	exec 6>&1
fi

#  Detect flags needed to achieve 'echo -n' (originally from GNU autoconf) ...
if (echo "testing\c"; echo 1,2,3) | grep c >/dev/null; then
	#  Stardent Vistra SVR4 grep lacks -e, says ghazi@caip.rutgers.edu.
	if (echo -n testing; echo 1,2,3) | sed s/-n/xn/ | grep xn >/dev/null
	then
		mc_n= mc_c='
' mc_t='        '
	else
		mc_n=-n mc_c= mc_t=
	fi
else
	mc_n= mc_c='\c' mc_t=
fi

#  This helps us call ourself.
mc_self_call="$0 --srcdir=${mc_srcdir} --top_srcdir=${mc_topsrcdir}"

#  Assign parameters
mc_cmd=$1
if test "x${mc_cmd}" != x; then
	shift
	mc_paras=$*
fi

case x${mc_cmd} in
xhelp)
#
#  Display help
#

	cat 1>&6 <<EOF
Usage: ${mc_pn} [OPTIONS] COMMAND

Commands:
    add                  Add a module to the list of active eggdrop modules.
    del                  Remove a module from that list.
    clear                Clear the list.
    static.h             Create \`src/mod/static.h'.
    Makefile             Create \`src/mod/Makefile'.
    configure            Interactively select modules.
    is-configured        Exits 0/1 depending on wether modules where
                           configured or not.
    update-depends       Check all module dependencies and add modules missing.
    help                 Displays this information.
    detect-modules       Find all available modules.
    modules-still-exist  Check wether all known modules still exist.

Options:
    --top_srcdir=DIR     Top directory         (At least one of these two
    --srcdir=DIR         Source directory       directories MUST be supplied.)
    --bindir=DIR         Binary directory
    --quiet [-q]         Quiet mode. Only show errors.

Options specific to the \`configure' command:

    --only-new [-n]      Only query new modules.
EOF
;;
xis-configured)
#
#  Determine wether the modules were configured yet.
#

	if test -r "${mc_fmodules}"; then
		exit 0
	else
		exit 1
	fi
;;
xmodules-still-exist)
#
#  Check wether all known modules still exist.
#

	if ${mc_self_call} -q is-configured; then
		mc_known_mods=`cat ${mc_fknownmods}`

		echo ${mc_n} "Checking for removed modules...${mc_c}" 1>&6
		#  Check wether all known mods still exist
		for mc_mod in ${mc_known_mods}; do
			echo ${mc_n} ".${mc_c}" >&6
			if test ! -d ${mc_mod_dir}/${mc_mod}; then
				grep -v "^${mc_mod}$" ${mc_fknownmods} > ${mc_fknownmods}_new
				mv ${mc_fknownmods}_new ${mc_fknownmods}
			fi
		done
		echo " done." 1>&6
	fi
;;
xdetect-modules)
#
#  Detect modules. Active modules will be added to the `.modules' file. The
#  behaviour changes as soon as `.modules' already exists.
#

	echo ${mc_n} "Detecting modules...${mc_c}" >&6

	if ${mc_self_call} -q is-configured; then
		mc_mods_configured=yes

		mv ${mc_fmodules} ${mc_fmodules}_old

		mc_fmodules_old=${mc_fmodules}
		mc_fmodules=${mc_fmodules}_old
	else
		mc_mods_configured=no

		mc_fmodules_old=
	fi

	mc_mods=`echo ${mc_srcdir}/mod/*.mod | sed -e 's/\.mod//g'`
	if test "${mc_mods}" = "${mc_srcdir}/mod/*"; then
		echo "${mc_pn}: error: no modules detected." >&2
		exit 1
	fi

	#  Add them again.
	mc_mods=`echo ${mc_mods} | sed -e 's/\.mod//g'`
	for mc_mod in ${mc_mods}; do
		mc_mod=`echo ${mc_mod} | sed -e 's/.*\///g'`
		mc_new_mod_state=disabled
		echo ${mc_n} ".${mc_c}" >&6

		#  Do we have an existing configuration?
		if (test "${mc_mods_configured}" = yes); then
			#  Is the module active?
			if (grep "^${mc_mod}\.mod\$" ${mc_fmodules} 1>&7 2>&1)
			then
				mc_new_mod_state=enabled
			else
				#  Was it configured before?
				if (grep "^${mc_mod}\.mod\$" ${mc_fknownmods} 1>&7 2>&1); then
					:
				else
					mc_new_mod_state=enabled
				fi
			fi
		else
			if (sed s/\ //g ${mc_fdisabledmods} 2>&1 | grep "^${mc_mod}\$" 1>&7 2>&1)
			then
				:
			else
				mc_new_mod_state=enabled
			fi
		fi
		if test "${mc_new_mod_state}" = enabled; then
			${mc_self_call} -q add ${mc_mod}
		else
			${mc_self_call} -q del ${mc_mod}
		fi
	done

	if test "x${mc_fmodules_old}" != x; then
		# mc_fmodules actually points to the .modules_old file.
		rm -f ${mc_fmodules}
		touch ${mc_fmodules_old}
	fi

	echo " done." >&6
;;
xMakefile)
#
#  Build `src/mod/Makefile'
#

	echo ${mc_n} "Building ${mc_fMakefile}... ${mc_c}" 1>&6

	#  Check for selected modules
	if test -r ${mc_fmodules}; then
		#  Convert newlines to spaces.
		mc_sel_modules=`cat ${mc_fmodules} | \
					awk '{ printf("%s ", $0); }'`
	else
		echo "${mc_pn}: error: no modules selected. You did not run \`make config' yet." 1>&2;
		exit 1
	fi

	mc_mod_objs=`echo ${mc_sel_modules} | sed -e 's/\.mod/.mod_o/g'`
	mc_mod_libs=`echo ${mc_sel_modules} | sed -e 's/\.mod/.mod_so/g'`

	if test ! -f ${mc_fMakefile}; then
		echo "failed." 1>&6
		echo "${mc_pn}: error: make file template not found." 1>&2
		exit 1
	fi

	#  The following sed expression modifies src/mod/Makefile to
	#  hold the new module names.
	if (cat "${mc_fMakefile}" | \
	    sed -e "s/^\(mods =\).*$/\1 ${mc_sel_modules}/g"  \
		-e "s/^\(mod_objs =\).*$/\1 ${mc_mod_objs}/g" \
		-e "s/^\(mod_libs =\).*$/\1 ${mc_mod_libs}/g" \
	    1> "${mc_fMakefile}_new"); then
		mv "${mc_fMakefile}_new" "${mc_fMakefile}"
	else
		echo "failed." 1>&6
		echo "${mc_pn}: sed failed to build ${mc_fMakefile}." 1>&2
		exit 1
	fi

	echo "done." 1>&6
;;
xstatic.h)
#
#  Build `static.h'
#

	echo ${mc_n} "Building static.h..." 1>&6

	#  Check for selected modules
	if test ! -r ${mc_fmodules}; then
		echo " failed." 1>&6
		echo "${mc_pn}: error: no modules selected. You did not run \`make config' yet." 1>&2;
		exit 1
	fi
	mc_sel_modules=`cat ${mc_fmodules} | sed -e 's/\.mod//g'`


	#  Note:  All data is written to `src/mod/static.h' which is
	#         later included into `src/main.c'.

	#  Remove old static.h
	rm -f ${mc_fstatic_h}

	#  Header
	cat 1>> ${mc_fstatic_h} << EOF
/* src/mod/static.h -- header file for static compiles.
 *
 * NOTE: Do not edit directly. Instead, re-run \`make config'.
 */

#ifndef _EGG_MOD_STATIC_H
#define _EGG_MOD_STATIC_H

EOF

	#  Create declarations for module _start functions
	for mc_mod in ${mc_sel_modules}; do
		echo ${mc_n} ".${mc_c}" 1>&6
		echo "char *${mc_mod}_start();" 1>> ${mc_fstatic_h}
	done
	echo 1>> ${mc_fstatic_h}

	#  The link_statics() function ...
	echo "static void link_statics()" 1>> ${mc_fstatic_h}
	echo "{" 1>> ${mc_fstatic_h}
	for mc_mod in ${mc_sel_modules}; do
		echo "  check_static(\"${mc_mod}\", ${mc_mod}_start);" 1>> ${mc_fstatic_h}
	done
	cat 1>> ${mc_fstatic_h} << EOF
}

#endif /* _EGG_MOD_STATIC_H */
EOF

	echo " done." 1>&6
;;
xdel)
#
#  Remove a module from the list
#

	if test "x${mc_paras}" = x; then
		echo "${mc_pn}: error: no modules specified." 2>&1
		exit 1
	fi

	mc_nfmodules="${mc_fmodules}_new"

	#  Remove trailing `.mod'
	mc_mods=`echo ${mc_paras} | sed -e 's/\.mod//g'`
	for mc_mod in ${mc_mods}; do
		#  Remove any path information
		mc_mod=`echo ${mc_mod} | sed -e 's/.*\///'`
		echo "${mc_pn}: disabling eggdrop module: ${mc_mod}" 1>&6

		#  Add module to the list of known modules.
		if grep "^${mc_mod}\.mod$" ${mc_fknownmods} 1>&7 2>&7; then
			if test ! -d ${mc_mod_dir}/${mc_mod}.mod; then
				grep -v "^${mc_mod}\.mod$" ${mc_fknownmods} \
					> ${mc_fknownmods}_new
				mv ${mc_fknownmods}_new ${mc_fknownmods}
			fi
		else
			if test ! -d ${mc_mod_dir}/${mc_mod}.mod; then
				:
			else
				echo ${mc_mod}.mod 1>> ${mc_fknownmods}
			fi
		fi

		# In case there are any active modules ...
		if test -r ${mc_fmodules}; then
			#  Remove module from list of active modules.
			if grep -v "^${mc_mod}\.mod$" ${mc_fmodules} \
				1> ${mc_nfmodules}
			then
				:
			else
				echo "${mc_pn}: error: building new module file failed" 1>&2
				echo "Grepping for ${mc_mod}.mod in ${mc_fmodules} and writing to ${mc_nfmodules}."
				kill -STOP $$
				exit 1
			fi
			mv ${mc_nfmodules} ${mc_fmodules}
		fi
	done
;;
xadd)
#
#  Add a module to the list
#

	if test "x${mc_paras}" = x; then
		echo "${mc_pn}: error: no modules specified." 2>&1
		exit 1
	fi

	#  Remove trailing `.mod'
	mc_mods=`echo ${mc_paras} | sed -e 's/\.mod//g'`
	for mc_mod in ${mc_mods}; do
		#  Remove any path information
		mc_mod=`echo ${mc_mod} | sed -e 's/.*\///'`

		#  Add module to the list of known modules.
		if grep "^${mc_mod}\.mod$" ${mc_fknownmods} 1>&7 2>&7; then
			if test ! -d ${mc_mod_dir}/${mc_mod}.mod; then
				grep -v "^${mc_mod}\.mod$" ${mc_fknownmods} \
					> ${mc_fknownmods}_new
				mv ${mc_fknownmods}_new ${mc_fknownmods}
			fi
		else
			if test ! -d ${mc_mod_dir}/${mc_mod}.mod; then
				:
			else
				echo ${mc_mod}.mod 1>> ${mc_fknownmods}
			fi
		fi

		#  Add module to the list of active modules.
		if grep "^${mc_mod}\.mod$" ${mc_fmodules} 1>&7 2>&7; then
			:
		else
			if test ! -d ${mc_mod_dir}/${mc_mod}.mod; then
				echo "${mc_pn}: warning: module does not exist: \`${mc_mod}', ignoring." 1>&2
			else
				echo "${mc_pn}: enabling eggdrop module: ${mc_mod}" 1>&6

				#  Add it to the file
				echo ${mc_mod}.mod 1>> ${mc_fmodules}
			fi
		fi
	done
;;
xclear)
#
#  Clear list of modules
#

	echo "${mc_pn}: cleared list of eggdrop modules." 1>&6
	rm -f ${mc_fmodules}
	touch ${mc_fmodules}
;;
xupdate-depends)
#
#  Check the dependencies and add modules which are depended on, but
#  aren't enabled.
#

	mc_all_depends=
	mc_missing=

	echo ${mc_n} "Calculating dependencies...${mc_c}" 1>&6

	#  Check for selected modules
	if test ! -r ${mc_fmodules}; then
		echo " failed." 1>&6
		echo "${mc_pn}: error: no modules selected. You did not run configure yet." 1>&2
		exit 1
	fi
	mc_sel_modules=`cat ${mc_fmodules}`

	mc_new_mods="${mc_sel_modules}"
	while (test "x${mc_new_mods}" != x); do
		mc_mod_list="${mc_new_mods}"
		mc_new_mods=

		#  Go through every module in the list
		for mc_mod in ${mc_mod_list}; do
			echo ${mc_n} ".${mc_c}" 1>&6

			#  We have an info file, don't we?
			if (test ! -f ${mc_mod_dir}/${mc_mod}/modinfo); then
				continue
			fi

			#  Figure out the module's dependencies
			mc_mod_depends=`grep "^DEPENDS:" ${mc_mod_dir}/${mc_mod}/modinfo | sed -e 's/^DEPENDS://'`

			#  Check wether the dependencies are fulfilled
			for mc_m_depend in ${mc_mod_depends}; do
				if (echo ${mc_sel_modules} | \
					grep " ${mc_m_depend}" 1>&7 2>&7) || \
				    (echo ${mc_sel_modules} | \
					grep "^${mc_m_depend}" 1>&7 2>&7)
				then
					:
				else
					#  Does the module actually exist?
					if test ! -d ${mc_mod_dir}/${mc_m_depend}.mod
					then
						mc_missing="${mc_missing} ${mc_m_depend}"
						continue
					fi

					#  This one is missing. Add it to the
					#  list.
					mc_all_depends="${mc_all_depends} ${mc_m_depend}"
					mc_sel_modules="${mc_sel_modules} ${mc_m_depend}"

					#  Add to list of modules to check in
					#  next dependency cycle.
					mc_new_mods="${mc_new_mods} ${mc_m_depend}.mod"
				fi
			done
		done
	done
	echo " done." 1>&6

	#  Warn about missing modules.
	if test "x${mc_missing}" != x; then
		cat 1>&2 <<EOF
${mc_pn}: warning:

   The following modules were not found but are needed:

      `echo ${mc_missing} | sed -e 's/ /, /g'`

EOF
		echo ${mc_n} "Press enter to continue... ${mc_c}"
		read mc_ask_response
	fi

	if test "x${mc_all_depends}" != x; then
		echo ${mc_n} "Adding modules needed to match dependencies... ${mc_c}" 1>&6
		echo ${mc_all_depends} | sed -e 's/ /, /g' 1>&6

		#  Add the modules
		${mc_self_call} -q add ${mc_all_depends}

		#  Update the makefile
		${mc_self_call} -q Makefile
	fi
;;
xconfigure)
#
#  Interactive module selection
#

	cat 1>&6 <<EOF

            -*-    Eggdrop Interactive Module Selection    -*-

EOF

	#  Check for selected modules
	if test ! -r ${mc_fmodules}; then
		echo "${mc_pn}: error: no modules selected. You did not run configure yet." 1>&2
		exit 1
	fi

	#  Read current list
	mc_sel_modules=`cat ${mc_fmodules}`

	#  Detect available modules
	mc_mods=`echo ${mc_mod_dir}/*.mod`

	#  Error out if we have no available modules
	if test "${mc_mods}" = "echo ${mc_mod_dir}/*.mod"; then
		echo "${mc_pn}: error: no modules found." 1>&2
		exit 1
	fi

	#  Loop through each available module
	for mc_mod in ${mc_mods}; do
		#  Remove directory information from name
		mc_mod=`echo ${mc_mod} | sed -e 's/.*\///'`

		#  Only ask for new modules?
		if test "${mc_flag_onlynew}" = yes; then
			#  Did we already query for that module?
			if grep "^${mc_mod}$" ${mc_fknownmods} 1>&7 2>&7; then
				continue
			fi
		fi

		#  Remove .mod ending
		mc_modname=`echo ${mc_mod} | sed -e 's/\.mod//g'`

		#  Note: We need to make sure that we only catch module names
		#        that match _exactly_. e.g. don't mix bseen and seen.
		if (echo ${mc_sel_modules} | grep " ${mc_mod}" 1>&7 2>&7) ||
		    (echo ${mc_sel_modules} | grep "^${mc_mod}" 1>&7 2>&7)

		then
			#  The module is selected.
			mc_mstate="enabled"
			mc_mdisp="(E)nable / (d)isable [E/d] ->"
		else
			#  The module is NOT selected.
			mc_mstate="disabled"
			mc_mdisp="(e)nable / (D)isable [e/D] ->"
		fi

		#  Display description
		if test -r ${mc_mod_dir}/${mc_mod}/modinfo; then
			echo "" 1>&6
			grep "^DESC:" ${mc_mod_dir}/${mc_mod}/modinfo | \
				sed -e 's/^DESC:/   /' 1>&6
			echo "" 1>&6
		fi

		while true; do
			echo ${mc_n} "\`${mc_modname}' is ${mc_mstate}: ${mc_mdisp} ${mc_c} " 1>&6
			read mc_ask_response;

			if (test "${mc_ask_response}" = D); then
				mc_ask_response=d;
			fi
			if (test "${mc_ask_response}" = E); then
				mc_ask_response=e;
			fi

			#  If the user just presses [return] or
			#  if the selected state matches the old state,
			#  then we change nothing.
			if test "x${mc_ask_response}" = x || \
			    (test "${mc_ask_response}" = d && \
			     test "${mc_mstate}" = disabled) || \
			    (test "${mc_ask_response}" = e && \
			     test "${mc_mstate}" = enabled); then
				echo "Changing nothing." 1>&6
				break;
			fi
			if (test "${mc_ask_response}" = e); then
				#  Add it to the list.
				mc_sel_modules="${mc_sel_modules} ${mc_mod}"
				echo "Enabled module '${mc_modname}'." 1>&6
				break;
			fi
			if (test "${mc_ask_response}" = d); then
				#  Remove module from list.
				mc_sel_modules=`echo ${mc_sel_modules} | sed -e "s/ ${mc_mod}//g" -e "s/^${mc_mod}//g"`
				echo "Disabled module '${mc_modname}'." 1>&6
				break;
			fi
		done
		echo "" 1>&6
	done

	echo ${mc_n} "Recreating list of active modules...${mc_c}" 1>&6
	${mc_self_call} -q clear
	if (${mc_self_call} -q add ${mc_sel_modules}); then
		echo " done." 1>&6
	else
		echo " failed!" 1>&6
		exit 1
	fi
;;
*)
	if test "x${mc_cmd}" = x; then
		echo "${mc_pn}: error: no command supplied." 1>&2
	else
		echo "${mc_pn}: error: ${mc_cmd}: unknown command." 1>&2
	fi
	${mc_self_call} help
;;
esac

exit 0