#!/bin/sh

myname="${0##*/}"

VERSION=$( cat .version )

DATE=$( date +%Y%m%d )

PREFIX_DEFAULT=/usr/local

BINDIR_set=

LIBDIR_set=

DOCDIR_set=

MANDIR_set=

LOCAL_set=

FORCE=

do_quit=

# Simply print the error message, and exit. Obvious, he?

do_error() {

    printf "${myname}: ${@}\n"

    exit 1

}

# Given an option string and the following argument,

# echoes the value of the option.

# If --var=val => echoes val and returns 0, meaning second arg was not consumed

# If --var val => echoes val and returns non null, meaning second arg was used

get_optval(){

    case "$1" in

        --*=?*)

            printf "${1#*=}"

            return 0

            ;;

        *)

            printf "${2}"

            return 1

            ;;

    esac

}

# The set_xxx functions will set the corresponding configuration variable

# They return 0 if second arg was not consumed, and non-zero if it was consumed.

set_prefix() {

    PREFIX="$( get_optval "$1" "$2" )"

}

set_bindir() {

    BINDIR_set=1

    BINDIR="$( get_optval "$1" "$2" )"

}

set_libdir() {

    LIBDIR_set=1

    LIBDIR="$( get_optval "$1" "$2" )"

}

set_docdir() {

    DOCDIR_set=1

    DOCDIR="$( get_optval "$1" "$2" )"

}

set_mandir() {

    MANDIR_set=1

    MANDIR="$( get_optval "$1" "$2" )"

}

set_tool() {

    local var_name="${1%%=*}"

    var_name="${var_name#--with-}"

    eval ${var_name}="\$( get_optval "$1" "$2" )"

}

# var_list is a list of variables, each one holding a path to a

# tool, either detected by ./configure, or specified by the user.

var_list=""

# This function adds a variable name to the above list of variable names.

# $1: the name of the variable to add to the list

add_to_var_list() {

    var_list="${var_list} ${1}"

}

# A function to test for required tools/headers/libraries

# $*: [prog|inc|lib]=<name[ name...]>

#     the name(s) of tool(s) to test for

#     mandatory

#       eg: prog=bash   prog="curl wget"

# $*: var=<var_name>

#     the name of the variable to test and set

#     optional

#       eg: var=bash    if ${bash} is set and non-null, use that,

#                       else check for bash and set bash=$(which bash)

# $*: ver=<regexp>

#     for each 'prog', test if $(prog --version) matches 'regexp'

#     optional

#       eg: ver='^GNU bash, version [34]\.'

# $*: err=<error_message>

#     the error message to print if tool is missing

#     optional, defaults to: '${prog}: none found'

#       eg: err="'bash' 3.x or above was not found"

has_or_abort() {

    local prog inc lib

    local var ver err

    local val

    local item

    local where

    local status

    for item in "${@}"; do

        case "${item}" in

            prog=*|inc=*|lib=*|var=*|ver=*|err=*)

                eval ${item%%=*}="'${item#*=}'"

                ;;

            *)  do_error "has_or_abort: incorrect parameters: '$@'";;

        esac

    done

    case "${prog}:${inc}:${lib}" in

        ?*::)

            for item in ${prog}; do

                printf "Checking for '${item}'... "

                if [ -n "${var}" ]; then

                    eval val="\${${var}}"

                    if [ -n "${val}" ]; then

                        printf "${val} (cached)\n"

                        return 0

                    fi

                fi

                where="$( which "${item}" 2>/dev/null )"

                if [ -z "${where}" ]; then

                    printf "no\n"

                    continue

                elif [ -n "${ver}" ]; then

                    str=$( "${where}" --version 2>&1 |grep -E "${ver}" |head -n 1 )

                    if [ -z "${str}" ]; then

                        printf "no\n"

                        unset where

                        continue

                    fi

                fi

                status="${where}"

                break

            done

            ;;

        :?*:)

            for item in ${inc}; do

                printf "Checking for '${item}'... "

                if printf "#include \"${item}\"" |gcc -x c -c - -o /dev/null >/dev/null 2>&1; then

                    where="${item}"

                    status=yes

                    break;

                fi

                printf "no\n"

            done

            ;;

        ::?*)

            for item in ${lib}; do

                printf "Checking for '${item}'... "

                where="$( gcc -print-file-name="${item}" )"

                if [ "${where}" != "${item}" ]; then

                    where="$( readlink -e "${where}" )"

                    status=yes

                    break;

                fi

                printf "no\n"

            done

            ;;

    esac

    if [ -z "${status}" ]; then

        printf "\n${err:-${prog}${inc}${lib}: none found}\n\n"

        printf "Either you are missing entirely the needed tool,\n"

        printf "or the version you have is too old.\n"

        if [ -n "${var}" ]; then

            printf "You can give the path to this tool using: --with-${var}=PATH\n"

        fi

        # FORCE can be set in the environment

        [ -z "${FORCE}" ] && do_error "Bailing out..."

        printf "\n"

        printf "<*                                          *>\n"

        printf "<*            FORCE in action:              *>\n"

        printf "<* Continuing despite missing pre-requisite *>\n"

        printf "<*          Prepare for breakage            *>\n"

        printf "<*                                          *>\n"

        printf "\n"

    else

        printf "${status}"

        if [ -n "${var}" ]; then

            eval ${var}='"'"${where}"'"'

            add_to_var_list "${var}"

        fi

        printf "\n"

    fi

}

do_help() {

    cat <<__EOF__

\`configure' configures crosstool-NG-${VERSION} to adapt to many kind of systems.

USAGE: ./configure [OPTION]...

Defaults for the options are specified in brackets.

Configuration:

  -h, --help              display this help and exit

      --force             force configure to continue, even in case

                          some pre-requisites are missing

Installation directories:

  --prefix=PREFIX         install files in PREFIX [${PREFIX_DEFAULT}]

  --local                 don't install, and use current directory

By default, \`make install' will install all the files in

\`${PREFIX_DEFAULT}/bin', \`${PREFIX_DEFAULT}/lib' etc.  You can specify

an installation prefix other than \`${PREFIX_DEFAULT}' using \`--prefix',

for instance \`--prefix=\${HOME}'.

For better control, use the options below.

Fine tuning of the installation directories:

  --bindir=DIR            user executables [PREFIX/bin]

  --libdir=DIR            object code libraries [PREFIX/lib]

  --docdir=DIR            info documentation [PREFIX/share/doc]

  --mandir=DIR            man documentation [PREFIX/share/man]

Optional Features:

  --with-install=PATH     Specify the full PATH to GNU install

  --with-make=PATH        Specify the full PATH to GNU make >= 3.80

  --with-grep=PATH        Specify the full PATH to GNU grep

  --with-sed=PATH         Specify the full PATH to GNU sed

  --with-bash=PATH        Specify the full PATH to bash >= 3.0

__EOF__

}

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

# Set user's options

while [ $# -ne 0 ]; do

    case "$1" in

        --local)    LOCAL_set="y"; shift;;

        --prefix*)  set_prefix "$1" "$2" && shift || shift 2;;

        --bindir*)  set_bindir "$1" "$2" && shift || shift 2;;

        --libdir*)  set_libdir "$1" "$2" && shift || shift 2;;

        --docdir*)  set_docdir "$1" "$2" && shift || shift 2;;

        --mandir*)  set_mandir "$1" "$2" && shift || shift 2;;

        --with-*)   set_tool   "$1" "$2" && shift || shift 2;;

        --force)    FORCE=1; shift;;

        --help|-h)  do_help; exit 0;;

        *)          printf "Unrecognised option: '${1}'\n"; do_help; exit 1;;

    esac

done

# Use defaults

[ -z "${PREFIX}" ] && set_prefix "" "${PREFIX_DEFAULT}"

# Special case when installing locally

if [ "${LOCAL_set}" = "y" ]; then

    set_prefix "" "$( pwd )"

    set_bindir "" "$( pwd )"

    set_libdir "" "$( pwd )"

    set_docdir "" "$( pwd )/docs"

    set_mandir "" "$( pwd )/docs"

fi

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

# Some sanity checks, now

# We check for grep and sed manually, because they are used in has_or_abort

printf "Checking for 'grep'... "

if [ -n "${grep}" ]; then

    printf "${grep} (cached)\n"

else

    grep="$( which grep 2>/dev/null )"

    if [ -z "${grep}" ]; then

        printf "not found\n"

    else

        printf "${grep}\n"

        printf "Checking whether '${grep}' supports -E... "

        if echo 'foo' |"${grep}" -E 'foo' >/dev/null 2>&1; then

            printf "yes\n"

        else

            printf "no\n"

            grep=

        fi

    fi

fi

if [ -z "${grep}" ]; then

    printf "Either you are missing entirely the needed tool,\n"

    printf "or the version you have is too old.\n"

    printf "You can give the path to this tool using: --with-grep=PATH\n"

    do_error "Bailing out..."

fi

add_to_var_list grep

printf "Checking for 'sed'... "

if [ -n "${sed}" ]; then

    printf "${sed} (cached)\n"

else

    sed="$( which sed 2>/dev/null )"

    if [ -z "${sed}" ]; then

        printf "not found\n"

    else

        printf "${sed}\n"

        printf "Checking whether '${sed}' supports -i and -e... "

        touch .ct-ng.sed.test

        if "${sed}" -r -i -e 's/foo/bar/' .ct-ng.sed.test >/dev/null 2>&1; then

            printf "yes\n"

        else

            printf "no\n"

            sed=

        fi

        rm -f .ct-ng.sed.test

    fi

fi

if [ -z "${sed}" ]; then

    printf "Either you are missing entirely the needed tool,\n"

    printf "or the version you have is too old.\n"

    printf "You can give the path to this tool using: --with-sed=PATH\n"

    do_error "Bailing out..."

fi

add_to_var_list sed

# The regular list of tools we can now easily check for

has_or_abort prog=bash                              \

             var=bash                               \

             ver='^GNU bash, version (3\.[1-9]|4)'  \

             err="'bash' 3.1 or above was not found"

has_or_abort prog=cut

has_or_abort prog=install var=install

has_or_abort prog=make                                  \

             var=make                                   \

             ver='^GNU Make (3.[89][[:digit:]]|[4-9])'  \

             err="GNU 'make' 3.80 or above was not found"

has_or_abort prog=gcc

has_or_abort prog="awk gawk" ver='^GNU Awk' err="GNU 'awk' was not found"

has_or_abort prog=bison

has_or_abort prog=flex

has_or_abort prog=makeinfo

has_or_abort prog=automake                                                      \

             ver='\(GNU automake\) (1\.[[:digit:]]{2,}|[2-9][[:digit:]]*\.)'    \

             err="'automake' 1.10 or above was not found"

has_or_abort prog=libtool                                                                           \

             ver='\(GNU libtool.*\) (2[[:digit:]]*\.|1\.6[[:digit:]]*\.|1\.5\.[2-9][[:digit:]]+)'   \

             err="'libtool' 1.5.26 or above was not found"

has_or_abort prog=stat ver='GNU coreutils'

has_or_abort prog="curl wget"

has_or_abort prog=cvs

has_or_abort prog=patch

has_or_abort prog=tar

has_or_abort prog=gzip

has_or_abort prog=bzip2

has_or_abort prog=lzma

has_or_abort prog=readlink

has_or_abort inc="ncurses/ncurses.h ncurses/curses.h ncurses.h curses.h"    \

             err="'ncurses' headers files were not found"

ncurses_libs="$( for l in ncursesw ncurses curses; do   \

                     for x in so a dylib; do            \

                         printf "lib$l.$x ";            \

                     done;                              \

                 done                                   \

               )"

has_or_abort lib="${ncurses_libs}"                  \

             err="'ncurses' library was not found"

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

# Compute the version string

# If this version is a svn snapshot, try to get the revision number

# If we can't get the revision number, use date

case "${VERSION}" in

    *+hg|hg)

        has_or_abort prog=hg

        printf "Computing version string... "

        REVISION="$( hg id -n 2>/dev/null )"

        case "${REVISION}" in

            "")

                VERSION="${VERSION}_unknown@$( date +%Y%m%d.%H%M%S )";;

            *)

                VERSION="${VERSION}_$( hg id -b )@${REVISION%%+}_$( hg id -i )"

                ;;

        esac

        # Arrange to have no / in the directory name, no need to create an

        # arbitrarily deep directory structure

        VERSION="$( printf "${VERSION}\n" |"${sed}" -r -e 's|/+|_|g;' )"

        ;;

esac

echo "${VERSION}"

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

# Compute and check install paths

# Now we have the version string, we can build up the paths

[ -z "${BINDIR_set}" ] && BINDIR="${PREFIX}/bin"

[ -z "${LIBDIR_set}" ] && LIBDIR="${PREFIX}/lib/ct-ng-${VERSION}"

[ -z "${DOCDIR_set}" ] && DOCDIR="${PREFIX}/share/doc/ct-ng-${VERSION}"

[ -z "${MANDIR_set}" ] && MANDIR="${PREFIX}/share/man/man1"

# Check that install PATHs are absolute

for p in BIN LIB DOC MAN; do

    var="${p}DIR"

    eval v='"${'"${var}"'}"'

    case "${v}" in

        /*) ;;

        *)  do_error "'${var}' is not an absolute path: '${v}'"

    esac

done

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

# That's all, folks!

printf "Building up Makefile... "

var_sed="$( for var_name in ${var_list}; do

                eval echo 's,@@${var_name}@@,${'"${var_name}"'},g'

            done 

          )"

"${sed}" -r -e "s,@@BINDIR@@,${BINDIR},g

                s,@@LIBDIR@@,${LIBDIR},g

                s,@@DOCDIR@@,${DOCDIR},g

                s,@@MANDIR@@,${MANDIR},g

                s,@@VERSION@@,${VERSION},g

                s,@@DATE@@,${DATE},g

                ${var_sed}

                s,@@LOCAL@@,${LOCAL_set},g"  Makefile.in >Makefile

echo "done"

cat <<__EOF__

crosstool-NG configured as follows:

  PREFIX='${PREFIX}'

  BINDIR='${BINDIR}'

  LIBDIR='${LIBDIR}'

  DOCDIR='${DOCDIR}'

  MANDIR='${MANDIR}'

Now run:

  make

__EOF__

if [ "${LOCAL_set}" != "y" ]; then

    printf "  make install\n"

fi