dnl -*-autoconf-*-
dnl
dnl Configuration script for SOD
dnl
dnl (c) 2015 Straylight/Edgeware
dnl

dnl----- Licensing notice ---------------------------------------------------
dnl
dnl This file is part of the Sensible Object Design, an object system for C.
dnl
dnl SOD is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2 of the License, or
dnl (at your option) any later version.
dnl
dnl SOD is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with SOD; if not, write to the Free Software Foundation,
dnl Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

dnl--------------------------------------------------------------------------
dnl Initialization.

mdw_AUTO_VERSION
AC_INIT([sod], AUTO_VERSION, [mdw@distorted.org.uk])
AC_CONFIG_SRCDIR([lib/sod.h])
AC_CONFIG_AUX_DIR([config])
AM_INIT_AUTOMAKE([foreign])
mdw_SILENT_RULES

AC_PROG_CC
AM_PROG_LIBTOOL
AX_CFLAGS_WARN_ALL
mdw_LIBTOOL_VERSION_INFO

dnl--------------------------------------------------------------------------
dnl Convert the version number for ASDF.

## This is surprisingly awful.  The convention for official version numbers
## is that they look like [MAJOR.MINOR.PATCH~]MAJOR.MINOR.PATCH[.BPB]
## [-N-gHEX[+]].  ASDF insists on simple numeric things separated by dots.
## If there's no interim-version thing on the front or Git thing on the end,
## then the main version number will do fine.  If there is, then we insert
## /two/ `0's in, followed by N and the HEX converted to decimal.  Why two?
## Because if there's no brown-paper-bag number, we want to make sure that
## the first BPB release is higher than any of the preceding Git revisions.
ver=AC_PACKAGE_VERSION
case $ver in
  *-*-g*)
    case $ver in
      *~*) pre=${ver%%~*}. tail=${ver#*~} ;;
      *) pre= tail=$ver ;;
    esac
    base=${tail%%-*} tail=${tail#*-}
    n=${tail%%-*} tail=${tail#*-g}
    case $tail in *+) grubby=.0.1 tail=${tail%+} ;; *) grubby= ;; esac
    rev=$(( 0x$tail ))
    ASDF_VERSION=$pre$base.0.0.$n.$rev$grubby
    ;;
  *)
    ASDF_VERSION=$ver
    ;;
esac
AC_SUBST([ASDF_VERSION])

dnl--------------------------------------------------------------------------
dnl Common Lisp things.

AC_ARG_WITH([lisp-system],
	[AS_HELP_STRING([--with-lisp-system=SYSTEMS],
			[preference order of cl-launch Lisp systems])],
	[], [with_lisp_system="sbcl clisp"])

AC_CHECK_PROGS([CL_LAUNCH], [cl-launch], [not-found])
case "$CL_LAUNCH" in
  not-found) AC_MSG_ERROR([\`cl-launch' not found]) ;;
esac

AC_MSG_CHECKING([for best choice of Lisp system])
if ! LISPSYS=$($CL_LAUNCH -l "$with_lisp_system" \
		-ip '(string-downcase (lisp-implementation-type))'); then
  AC_MSG_ERROR([cl-launch didn't like any Lisp system])
fi
AC_SUBST([LISPSYS])
AC_MSG_RESULT([$LISPSYS])

AC_MSG_CHECKING([FASL file extension])
fasl=$($CL_LAUNCH -l $LISPSYS -ip \
	'(pathname-type (compile-file-pathname "foo.lisp"))')
AC_SUBST([fasl])
AC_MSG_RESULT([.$fasl])

AC_ARG_WITH([lisp-source-dir],
	[AS_HELP_STRING([--with-lisp-source-dir=DIR],
			[where to install Common Lisp source files])],
	[], [with_lisp_source_dir='${datadir}/common-lisp/source'])
AC_ARG_WITH([lisp-system-dir],
	[AS_HELP_STRING([--with-lisp-system-dir=DIR],
			[where to install ASDF system links])],
	[], [with_lisp_system_dir='${datadir}/common-lisp/systems'])
AC_SUBST([lispsrcdir], [$with_lisp_source_dir])
AC_SUBST([lispsysdir], [$with_lisp_system_dir])

dnl--------------------------------------------------------------------------
dnl TeX things.

AC_DEFUN([SOD_CHECK_LATEX_FILE],
  [sod_thing="$1"; case $sod_thing in
     *.sty) sod_thing=${sod_thing%.sty} sod_what=package ;;
     *.cls) sod_thing=${sod_thing%.cls} sod_what="document class" ;;
     *.tfm) sod_thing=${sod_thing%.tfm} sod_what="font metrics" ;;
     *) sod_what="file" ;;
   esac
   AS_VAR_PUSHDEF([SOD_Pkg], [sod_cv_latex_$1])
   AC_CACHE_CHECK([for LaTeX `$sod_thing' $sod_what],
     [SOD_Pkg],
     [if $KPSEWHICH >/dev/null 2>&1 --progname=pdflatex $1
      then SOD_Pkg=yes
      else SOD_Pkg=no; fi])
   case $SOD_Pkg in
     yes) m4_default([$2], [:]) ;;
     no) m4_default([$3], [AC_MSG_ERROR([Can't find `$1'])]) ;;
   esac
   AS_VAR_POPDEF([SOD_Pkg])])

dnl See if we want to build the documentation.
AC_ARG_ENABLE([manual], [AS_HELP_STRING([--enable-manual])],
	[if test "$enableval" = "no"
	 then sod_want_latex=no sod_have_latex=no
	 else sod_want_latex=must sod_have_latex=maybe; fi],
	[sod_want_latex=maybe sod_have_latex=maybe])

dnl Make sure the TeX programs we need are available.
case $sod_have_latex in maybe)
AC_CHECK_PROGS([TEX], [tex], [none])
AC_CHECK_PROGS([PDFLATEX], [pdflatex], [none])
AC_CHECK_PROGS([KPSEWHICH], [kpsewhich], [none])
AC_CHECK_PROGS([BIBTEX], [bibtex], [none])
AC_CHECK_PROGS([MAKEINDEX], [makeindex], [none])
case ,$TEX,$PDFLATEX,$KPSEWHICH,$BIBTEX,$MAKEINDX, in
  *,none,*)
    AC_MSG_WARN([Necessary TeX programs not found: can't build manual!])
    sod_have_latex=no
    ;;
esac
;; esac

sod_have_custom_bib=no
case $sod_have_latex in maybe)
SOD_CHECK_LATEX_FILE([strayman.cls], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([fontenc.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([inputenc.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([longtable.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([makeidx.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([amssymb.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([tikz.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([at.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([footnote.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([mdwfonts.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([mdwref.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([mdwtab.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([mdwthm.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([sverb.sty], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([syntax.sty], [], [sod_have_latex=no])

SOD_CHECK_LATEX_FILE([cmr12.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([cmbx10.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([cmcsc10.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([cmex10.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([cmmi12.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([cmsy10.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([cmti10.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([msam10.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([msbm10.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([ecrm1000.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([logo10.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([pplr8r.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([pplri8r.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([pplb8r.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([phvr8r.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([phvb8r.tfm], [], [sod_have_latex=no])
SOD_CHECK_LATEX_FILE([pcrr8rn.tfm], [], [sod_have_latex=no])

SOD_CHECK_LATEX_FILE([merlin.mbs], [sod_have_custom_bib=yes], [:])

case $sod_have_latex in
  no)
    AC_MSG_WARN([Necessary LaTeX packages not found: can't build manual!])
    ;;
esac
;; esac

case $sod_want_latex,$sod_have_latex in
  must,no)
    AC_MSG_ERROR([Couldn't find necessary LaTeX support to build manual!])
    ;;
  *,maybe)
    sod_have_latex=yes
    ;;
esac
AM_CONDITIONAL([HAVE_LATEX], [test "$sod_have_latex" = "yes"])
AM_CONDITIONAL([HAVE_CUSTOM_BIB], [test "$sod_have_custom_bib" = "yes"])

dnl--------------------------------------------------------------------------
dnl Output.

AC_CONFIG_FILES(
  [Makefile]
  [src/Makefile]
  [lib/Makefile]
  [doc/Makefile]
  [test/Makefile])
AC_OUTPUT

dnl----- That's all, folks --------------------------------------------------