#!/bin/sh

# Defaults

APP_NAME="Prosody"

APP_DIRNAME="prosody"

PREFIX="/usr/local"

SYSCONFDIR="$PREFIX/etc/$APP_DIRNAME"

LIBDIR="$PREFIX/lib"

DATADIR="$PREFIX/var/lib/$APP_DIRNAME"

LUA_SUFFIX=""

LUA_DIR="/usr"

LUA_BINDIR="/usr/bin"

LUA_INCDIR="/usr/include"

LUA_LIBDIR="/usr/lib"

IDN_LIB="idn"

ICU_FLAGS="-licui18n -licudata -licuuc"

OPENSSL_LIB="crypto"

CC="gcc"

LD="gcc"

RUNWITH="lua"

EXCERTS="yes"

PRNG=

PRNGLIBS=

CFLAGS="-fPIC -std=c99"

CFLAGS="$CFLAGS -Wall -pedantic -Wextra -Wshadow -Wformat=2"

LDFLAGS="-shared"

IDN_LIBRARY="icu"

# Help

show_help() {

cat <<EOF

Configure $APP_NAME prior to building.

--help                      This help.

--ostype=OS                 Use one of the OS presets. May be one of:

                            debian, macosx, linux, freebsd, openbsd, netbsd

--prefix=DIR                Prefix where $APP_NAME should be installed.

                            Default is $PREFIX

--sysconfdir=DIR            Location where the config file should be installed.

                            Default is \$PREFIX/etc/$APP_DIRNAME

--libdir=DIR                Location where the server files should be stored.

                            Default is \$PREFIX/lib

--datadir=DIR               Location where the server data should be stored.

                            Default is \$PREFIX/var/lib/$APP_DIRNAME

--lua-version=VERSION       Use specific Lua version: 5.2, 5.3, or 5.4

                            Default is auto-detected.

--lua-suffix=SUFFIX         Versioning suffix to use in Lua filenames.

                            Default is "$LUA_SUFFIX" (lua$LUA_SUFFIX...)

--with-lua=PREFIX           Use Lua from given prefix.

                            Default is auto-detected (the parent directory of \$LUA_BINDIR).

--with-lua-bin=DIR          You can also specify Lua's bin dir.

                            Default is the directory of the auto-detected Lua interpreter,

                            or \$LUA_DIR/bin if --with-lua is used.

--runwith=BINARY            What Lua binary to set as runtime environment.

                            Default is $RUNWITH

--with-lua-include=DIR      You can also specify Lua's includes dir.

                            Default is \$LUA_DIR/include

--with-lua-lib=DIR          You can also specify Lua's libraries dir.

                            Default is \$LUA_DIR/lib

--with-idn=LIB              The name of the IDN library to link with.

                            Default is $IDN_LIB

--idn-library=(idn|icu)     Select library to use for IDNA functionality.

                            idn: use GNU libidn

                            icu: use ICU from IBM (default)

--with-ssl=LIB              The name of the SSL to link with.

                            Default is $OPENSSL_LIB

--with-random=METHOD        CSPRNG backend to use. One of

                            getrandom: Linux kernel

                            arc4random: OpenBSD kernel

                            openssl: OpenSSL RAND method

                            Default is to use /dev/urandom

--cflags=FLAGS              Flags to pass to the compiler

                            Default is $CFLAGS

--add-cflags=FLAGS          Adds additional CFLAGS, preserving defaults.

                            Can be repeated.

--ldflags=FLAGS             Flags to pass to the linker

                            Default is $LDFLAGS

--add-ldflags=FLAGS         Adds additional linker flags, preserving defaults.

                            Can be repeated.

--c-compiler=CC             The C compiler to use when building modules.

                            Default is $CC

--compiler-wrapper=WRAPPER  Adds a prefix to compiler and linker calls,

                            usable for eg distcc or ccache.

--linker=CC                 The linker to use when building modules.

                            Default is $LD

--no-example-certs          Disables generation of example certificates.

EOF

}

# Helper functions

find_program() {

   prog=$(command -v "$1" 2>/dev/null)

   if [ -n "$prog" ]

   then

      dirname "$prog"

   fi

}

die() {

   echo "$*"

   echo

   echo "configure failed."

   echo

   exit 1

}

# COMPAT SC2039 has been phased out, remove in the future

# shellcheck disable=SC2039,SC3037

case $(echo -n x) in

-n*) echo_n_flag='';;

*)   echo_n_flag='-n';;

esac

echo_n() {

   echo $echo_n_flag "$*"

}

# ----------------------------------------------------------------------------

# MAIN PROGRAM

# ----------------------------------------------------------------------------

# Parse options

while [ -n "$1" ]

do

   value=$(echo "$1" | sed 's/[^=]*.\(.*\)/\1/')

   key=$(echo "$1" | sed 's/=.*//')

   # shellcheck disable=SC2088

   if echo "$value" | grep "~" >/dev/null 2>/dev/null

   then

      echo

      echo '*WARNING*: the "~" sign is not expanded in flags.'

      # shellcheck disable=SC2016

      echo 'If you mean the home directory, use $HOME instead.'

      echo

   fi

   case "$key" in

   --help)

      show_help

      exit 0

      ;;

   --prefix)

      [ -n "$value" ] || die "Missing value in flag $key."

      PREFIX="$value"

      PREFIX_SET=yes

      ;;

   --sysconfdir)

      [ -n "$value" ] || die "Missing value in flag $key."

      SYSCONFDIR="$value"

      SYSCONFDIR_SET=yes

      ;;

   --ostype)

      OSPRESET="$value"

      OSPRESET_SET="yes"

      ;;

   --libdir)

      LIBDIR="$value"

      LIBDIR_SET=yes

      ;;

   --datadir)

      DATADIR="$value"

      DATADIR_SET=yes

      ;;

   --lua-suffix)

      [ -n "$value" ] || die "Missing value in flag $key."

      LUA_SUFFIX="$value"

      LUA_SUFFIX_SET=yes

      ;;

   --lua-version|--with-lua-version)

      [ -n "$value" ] || die "Missing value in flag $key."

      LUA_VERSION="$value"

      [ "$LUA_VERSION" != "5.1" ] || die "Lua 5.1 is no longer supported"

      [ "$LUA_VERSION" = "5.2" ] || [ "$LUA_VERSION" = "5.3" ] || [ "$LUA_VERSION" = "5.4" ] || die "Invalid Lua version in flag $key."

      LUA_VERSION_SET=yes

      ;;

   --with-lua)

      [ -n "$value" ] || die "Missing value in flag $key."

      LUA_DIR="$value"

      LUA_DIR_SET=yes

      ;;

   --with-lua-bin)

      [ -n "$value" ] || die "Missing value in flag $key."

      LUA_BINDIR="$value"

      LUA_BINDIR_SET=yes

      ;;

   --with-lua-include)

      [ -n "$value" ] || die "Missing value in flag $key."

      LUA_INCDIR="$value"

      LUA_INCDIR_SET=yes

      ;;

   --with-lua-lib)

      [ -n "$value" ] || die "Missing value in flag $key."

      LUA_LIBDIR="$value"

      LUA_LIBDIR_SET=yes

      ;;

   --with-idn)

      IDN_LIB="$value"

      ;;

   --idn-library)

      IDN_LIBRARY="$value"

      ;;

   --with-ssl)

      OPENSSL_LIB="$value"

      ;;

   --with-random)

      case "$value" in

         getrandom)

            PRNG=GETRANDOM

            ;;

         openssl)

            PRNG=OPENSSL

            ;;

         arc4random)

            PRNG=ARC4RANDOM

            ;;

      esac

      ;;

   --cflags)

      CFLAGS="$value"

      ;;

   --add-cflags)

      CFLAGS="$CFLAGS $value"

      ;;

   --ldflags)

      LDFLAGS="$value"

      ;;

   --add-ldflags)

      LDFLAGS="$LDFLAGS $value"

      ;;

   --c-compiler)

      CC="$value"

      ;;

   --linker)

      LD="$value"

      ;;

   --runwith)

      RUNWITH="$value"

      RUNWITH_SET=yes

      ;;

    --no-example-certs)

      EXCERTS=

      ;;

   --compiler-wrapper)

      CC="$value $CC"

      LD="$value $LD"

      ;;

   *)

      die "Error: Unknown flag: $1"

      ;;

   esac

   shift

done

if [ "$OSPRESET_SET" = "yes" ]; then

	# TODO make this a switch?

   if [ "$OSPRESET" = "debian" ]; then

      CFLAGS="$CFLAGS -ggdb"

   fi

   if [ "$OSPRESET" = "macosx" ]; then

      if [ "$LUA_INCDIR_SET" != "yes" ]; then

         LUA_INCDIR=/usr/local/include;

         LUA_INCDIR_SET=yes

      fi

      if [ "$LUA_LIBDIR_SET" != "yes" ]; then

         LUA_LIBDIR=/usr/local/lib

         LUA_LIBDIR_SET=yes

      fi

      CFLAGS="$CFLAGS -mmacosx-version-min=10.3"

      LDFLAGS="-bundle -undefined dynamic_lookup"

   fi

   if [ "$OSPRESET" = "linux" ]; then

      CFLAGS="$CFLAGS -ggdb"

   fi

   if [ "$OSPRESET" = "freebsd" ] || [ "$OSPRESET" = "openbsd" ]; then

      LUA_INCDIR="/usr/local/include/lua52"

      LUA_INCDIR_SET=yes

      CFLAGS="-Wall -fPIC -I/usr/local/include"

      LDFLAGS="-I/usr/local/include -L/usr/local/lib -shared"

      LUA_SUFFIX="52"

      LUA_SUFFIX_SET=yes

      LUA_DIR=/usr/local

      LUA_DIR_SET=yes

      CC=cc

      LD=ld

   fi

   if [ "$OSPRESET" = "openbsd" ]; then

      LUA_INCDIR="/usr/local/include";

      LUA_INCDIR_SET="yes"

   fi

   if [ "$OSPRESET" = "netbsd" ]; then

      LUA_INCDIR="/usr/pkg/include/lua-5.2"

      LUA_INCDIR_SET=yes

      LUA_LIBDIR="/usr/pkg/lib/lua/5.2"

      LUA_LIBDIR_SET=yes

      CFLAGS="-Wall -fPIC -I/usr/pkg/include"

      LDFLAGS="-L/usr/pkg/lib -Wl,-rpath,/usr/pkg/lib -shared"

   fi

   if [ "$OSPRESET" = "pkg-config" ]; then

      if [ "$LUA_SUFFIX_SET" != "yes" ]; then

         LUA_SUFFIX="5.4";

         LUA_SUFFIX_SET=yes

      fi

      LUA_CF="$(pkg-config --cflags-only-I lua"$LUA_SUFFIX")"

      LUA_CF="${LUA_CF#*-I}"

      LUA_CF="${LUA_CF%% *}"

      if [ "$LUA_CF" != "" ]; then

         LUA_INCDIR="$LUA_CF"

         LUA_INCDIR_SET=yes

      fi

   fi

fi

if [ "$PREFIX_SET" = "yes" ] && [ ! "$SYSCONFDIR_SET" = "yes" ]

then

   if [ "$PREFIX" = "/usr" ]

   then SYSCONFDIR=/etc/$APP_DIRNAME

   else SYSCONFDIR=$PREFIX/etc/$APP_DIRNAME

   fi

fi

if [ "$PREFIX_SET" = "yes" ] && [ ! "$DATADIR_SET" = "yes" ]

then

   if [ "$PREFIX" = "/usr" ]

   then DATADIR=/var/lib/$APP_DIRNAME

   else DATADIR=$PREFIX/var/lib/$APP_DIRNAME

   fi

fi

if [ "$PREFIX_SET" = "yes" ] && [ ! "$LIBDIR_SET" = "yes" ]

then

   LIBDIR=$PREFIX/lib

fi

detect_lua_version() {

   detected_lua=$("$1" -e 'print(_VERSION:match(" (5%.[234])$"))' 2> /dev/null)

   if [ "$detected_lua" != "nil" ]

   then

      if [ "$LUA_VERSION_SET" != "yes" ]

      then

         echo "Lua version detected: $detected_lua"

         LUA_VERSION=$detected_lua

         return 0

      elif [ "$LUA_VERSION" = "$detected_lua" ]

      then

         return 0

      fi

   fi

   return 1

}

search_interpreter() {

   suffix="$1"

   if [ "$LUA_BINDIR_SET" = "yes" ]

      then

      find_lua="$LUA_BINDIR"

   elif [ "$LUA_DIR_SET" = "yes" ]

   then

      LUA_BINDIR="$LUA_DIR/bin"

      if [ -f "$LUA_BINDIR/lua$suffix" ]

      then

         find_lua="$LUA_BINDIR"

      fi

   else

      find_lua=$(find_program lua"$suffix")

   fi

   if [ -n "$find_lua" ] && [ -x "$find_lua/lua$suffix" ]

   then

      if detect_lua_version "$find_lua/lua$suffix"

      then

         echo "Lua interpreter found: $find_lua/lua$suffix..."

         if [ "$LUA_BINDIR_SET" != "yes" ]

         then

            LUA_BINDIR="$find_lua"

         fi

         if [ "$LUA_DIR_SET" != "yes" ]

         then

            LUA_DIR=$(dirname "$find_lua")

         fi

         LUA_SUFFIX="$suffix"

         return 0

      fi

   fi

   return 1

}

lua_interp_found=no

if [ "$LUA_SUFFIX_SET" != "yes" ]

then

   if [ "$LUA_VERSION_SET" = "yes" ] && [ "$LUA_VERSION" = "5.2" ]

   then

      suffixes="5.2 52 -5.2 -52"

   elif [ "$LUA_VERSION_SET" = "yes" ] && [ "$LUA_VERSION" = "5.3" ]

   then

      suffixes="5.3 53 -5.3 -53"

   elif [ "$LUA_VERSION_SET" = "yes" ] && [ "$LUA_VERSION" = "5.4" ]

   then

      suffixes="5.4 54 -5.4 -54"

   else

      suffixes="5.2 52 -5.2 -52"

      suffixes="$suffixes 5.3 53 -5.3 -53"

      suffixes="$suffixes 5.4 54 -5.4 -54"

   fi

   for suffix in "" $suffixes

   do

      search_interpreter "$suffix" && {

      lua_interp_found=yes

      break

   }

done