#!/bin/sh
# Usage: clisp-link command [more args]
# where
#   command = create, add, run, install
# For more usage information, see <doc/impnotes.html#mod-overview>.
# Or <http://clisp.cons.org/modules.html#mod-overview>.
# Bruno Haible 19.10.1994
# Sam Steingold 2002-2009

# This could as well be written in Lisp, for portability, but syscalls is
# a module, so most useful scripting functionality will not be available.

# Nuisances.
(unset CDPATH) >/dev/null 2>&1 && unset CDPATH

usage () {
echo "Usage: $0 [ create | add | run | install ] ..." 1>&2
exit 1
}

normalize(){                    # dir rel -> abs path for rel
  dirname=`dirname "$2"`
  echo `cd $1; cd ${dirname}; pwd`/`basename "$2"`
}

lncp () {
  # Make a link from $1 to $2. Try symbolic link, hard link, file copying.
  rm -f "$2"
  ln -s "`normalize . $1`" "$2" 2>/dev/null || \
    ln "$1" "$2" 2>/dev/null || \
    cp -p "$1" "$2"
}

lncp_some () {
  src_dir=$1; shift
  destdir=$1; shift
  ret=''
  for f in $*; do
    b=`basename $f`
    lncp "`normalize "${src_dir}" "$f"`" "${destdir}"/$b
    ret=${ret}" "$b
  done
  echo ${ret}
}

echotab () {
cat <<!!
	$1
!!
}

# Print the commands being executed
vecho () {
  echo "$@"
}

# print an error message and exit
fail () { echo "$0: $@" 1>&2; exit 1; }

# ensure that "$1" is a directory
check_dir () { test -d "$1" || fail "$1 is not a directory"; }

# make "$1" as a new directory
make_dest () {
  if [ -r "$1" ] ; then
    if [ -d "$1" ] ; then
      fail "$1 already exists"
    else
      fail "$1 is not a directory"
    fi
  fi
  mkdir "$1"
}

LISPRUN="lisp.run"
# ensure that "$1" contains a CLISP linking set
check_linkset () {
  test -r "$1"/lisp.a -a -x "$1"/${LISPRUN} -a -r "$1"/lispinit.mem \
    -a -r "$1"/modules.h -a -r "$1"/modules.o -a -r "$1"/makevars ||
  fail "directory $1 does not contain a CLISP linking set"
}

# ensure that "$1" contains a CLISP module
check_module () {
  if test \! -r "$1/link.sh"; then
    if test -r "$1/configure"; then
      echo "$0: no $1/link.sh, running $1/configure"
      olddir=`pwd`;
      cd $1; ./configure --with-clisp=${CLISP}; cd ${olddir}
      test -f "$1/link.sh" \
        || fail "directory $1 still does not contain a CLISP module"
    else fail "directory $1 does not contain a CLISP module"
    fi
  fi
}

verbose () {
  echo "$@"
  "$@" || fail "failed in `pwd`"
}

make_lisprun () {
  # Generate new modules.o, compiled from modules.c, includes modules.h
  lncp "$absolute_linkkitdir"/modules.c modules.c
  verbose ${CC} ${CPPFLAGS} ${CFLAGS} -I"$absolute_linkkitdir" -c modules.c
  rm -f modules.c
  # Generate new ${LISPRUN}
  verbose ${CC} ${CFLAGS} ${CLFLAGS} modules.o ${LIBS} -o ${LISPRUN}
}

# func_tmpdir
# creates a temporary directory.
# Sets variable
# - tmp             pathname of freshly created temporary directory
func_tmpdir ()
{
  # Use the environment variable TMPDIR, falling back to /tmp. This allows
  # users to specify a different temporary directory, for example, if their
  # /tmp is filled up or too small.
  : ${TMPDIR=/tmp}
  {
    # Use the mktemp program if available. If not available, hide the error
    # message.
    tmp=`(umask 077 && mktemp -d -q "$TMPDIR/gtXXXXXX") 2>/dev/null` &&
    test -n "$tmp" && test -d "$tmp"
  } ||
  {
    # Use a simple mkdir command. It is guaranteed to fail if the directory
    # already exists.  $RANDOM is bash specific and expands to empty in shells
    # other than bash, ksh and zsh.  Its use does not increase security;
    # rather, it minimizes the probability of failure in a very cluttered /tmp
    # directory.
    tmp=$TMPDIR/gt$$-$RANDOM
    (umask 077 && mkdir "$tmp")
  } || fail "cannot create a temporary directory in $TMPDIR"
}

# evaluate in clisp and strip quotes
clisp_eval() {
  ${CLISP} -q -x "$*" 2>/dev/null | tail -n 1 | sed -e 's/^"//' -e 's/"$//'
}

# Where do we install?
DYNMOD="dynmod"              # should be in sync with defs1.lisp:require
LIBDIR=""
set_dynamic_module_location() {
  if test -z "${LIBDIR}"; then
    if touch ${CLISP_LIBDIR}/${DYNMOD}/.abazonk 2>/dev/null; then
      rm -f ${CLISP_LIBDIR}/${DYNMOD}/.abazonk
      LIBDIR=${CLISP_LIBDIR}
    else # cf. src/m4/clisp.m4
      CLISP_LIBDIR_USER=`clisp_eval '(and *user-lib-directory* (namestring *user-lib-directory*))'`
      test "${CLISP_LIBDIR_USER}" = "NIL" && \
        fail "Cannot determine the dynamic module directory: *lib-directory* is not writable and *user-lib-directory* is not specified"
      mkdir -p ${CLISP_LIBDIR_USER}/${DYNMOD} || \
        fail "Cannot write in *user-lib-directory*"
      if touch ${CLISP_LIBDIR_USER}/${DYNMOD}/.abazonk 2>/dev/null; then
        rm -f ${CLISP_LIBDIR_USER}/${DYNMOD}/.abazonk
        LIBDIR=${CLISP_LIBDIR_USER}
      else fail "Cannot determine the dynamic module directory: neither *lib-directory* nor *user-lib-directory* are writable"
      fi
    fi
  fi
}

current_linking_set() {
  DIR=`clisp_eval '(sys::program-name)'`
  DIR=`dirname ${DIR}`
  check_linkset ${DIR};
  echo ${DIR}
}

# setting $with_dynamic_modules overrides the default
with_dynamic_modules=${with_dynamic_modules-no}

# prepare the loading infrastructure for the current dynamic module.
# this can be invoked only after "./link.sh" and relies on its variables.
# also uses:
#   ${absolute_currentdir} : the top level directory
prepare_dynamic_module() {
  if test "$with_dynamic_modules" != no; then
    set_dynamic_module_location
    dyndir=${LIBDIR}/${DYNMOD}
    dll="lib"; for m in ${NEW_MODULES}; do dll=${dll}-$m; done; dll=${dll}.so
    lib=${dyndir}/${dll}; libs="${NEW_LIBS} "; verbose 
    # for each module there will be a hard link to a REQUIRE file
    firstmod=''; othermods=''
    for m in ${NEW_MODULES}; do
      if test -z "${firstmod}"; then
        firstmod=$m
      else
        othermods=${othermods}' '$m
      fi
    done
    # create the REQUIRE file
    reqfile=${dyndir}/${firstmod}.lisp
    rm -f ${reqfile}
    for f in ${TO_PRELOAD}; do
      # preload files are not compiled
      echo "(cl:load (cl:merge-pathnames \"../${moduledir}/${f}\" cl:*load-truename*))" >> ${reqfile}
    done
    # dll has SHREXT extension
    DM="(sys::dynload-modules (cl:merge-pathnames \"${dll}\" cl:*load-truename*) (quote ("
    for m in ${NEW_MODULES}; do
      DM=${DM}" \"$m\""
    done
    echo ${DM}" )))" >> ${reqfile}
    if test -n "${TO_LOAD}"; then
      echo ";; for def-call-out to non-existent functions" >> ${reqfile}
      echo "(ext:appease-cerrors" >> ${reqfile}
      for f in ${TO_LOAD}; do
        # module files must be compiled
        echo " (cl:load (cl:merge-pathnames \"../${moduledir}/${f}.fas\" cl:*load-truename*))" >> ${reqfile}
      done
      echo ")" >> ${reqfile}
    fi
    # create links to the REQUIRE file
    for m in ${othermods}; do
      ln ${dyndir}/$m.lisp ${reqfile}
    done
  fi
}

# Remove the comment to Set debugging output on
#set -x

# Exit immediately if some command fails.
set -e

# Check number of arguments. Need at least one argument.
if [ $# = 0 ] ; then
  usage
fi

# Where is clisp?
if test -z "${CLISP}"; then
  CLISP=`dirname $0`
  CLISP=`cd ${CLISP}; pwd`/clisp
fi
# cd src/m4/clisp.m4
${CLISP} --version 2>/dev/null | head -n 1 | grep "GNU CLISP" >/dev/null 2>&1 \
  || fail "${CLISP} is not GNU CLISP"
CLISP_LIBDIR=`${CLISP} -b`

# Where is the link kit?
if [ -n "$CLISP_LINKKIT" ] ; then
  linkkitdir="$CLISP_LINKKIT"
else
  linkkitdir=${CLISP_LIBDIR}/linkkit
fi

test -r "$linkkitdir"/modules.c -a -r "$linkkitdir"/clisp.h ||
  fail "No link kit found in $linkkitdir (is CLISP_LINKKIT set?)"
absolute_linkkitdir=`cd "$linkkitdir" ; /bin/pwd`

# Dispatch according to the first argument.
case "$1" in

  create)
    # Usage: clisp-link create moduledir {file}*
    case $# in
      0 | 1) echo "Usage: $0 create moduledir file ..." 1>&2
             exit 1 ;;
    esac
    moduledir="$2"
    shift
    shift
    files="$*"
    make_dest "$moduledir"
    modulename=`echo "$moduledir" | sed -e 's,^.*/,,'`
    files_c=''
    files_o=''
    for file in $files; do
      file=`echo "$file" | sed -e 's,\.c$,,'`.c
      filename=`echo "$file" | sed -e 's,^.*/,,'`
      case "$file" in
        /*) relative_file="$file" ;;
        *)  case "$moduledir" in
              /*) relative_file="$file" ;;
              *)  relative_file=`echo "$moduledir"/ | sed -e 's,[^/][^/]*/*/,../,g'`"$file" ;;
            esac ;;
      esac
      ln -s "$relative_file" "$moduledir"/"$filename" || ln "$file" "$moduledir"/"$filename" || cp -p "$file" "$moduledir"/"$filename"
      files_c="$files_c"' '"$filename"
      files_o="$files_o"' '`echo "$filename" | sed -e 's,\.c$,,'`.o
    done
    if false; then
      # No Makefile
      (echo "file_list=''"
       for fc in $files_c; do
         fo=`echo "$fc" | sed -e 's,\.c$,,'`.o
         echo 'if test -r '"$fc"'; then'
         echo "  if test '"'!'"' -f $fo || test $fo -ot $fc; then"
         echo '    ${CC} ${CPPFLAGS} ${CFLAGS} -I"$absolute_linkkitdir" -c '"$fc"
         echo '  fi'
         echo '  file_list="$file_list"'"' $fo'"
         echo 'fi'
       done
       echo 'NEW_FILES="$file_list"'
       echo 'NEW_LIBS="$file_list"'
       echo "TO_LOAD=''"
      ) > "$moduledir"/link.sh
    else
      # With Makefile
      (echo "# Makefile for CLISP module set $modulename"
       echo
       echo "srcdir = ."
       echo "CC ="
       echo "CPPFLAGS ="
       echo "CFLAGS ="
       echo "CLISP = clisp -q -norc"
       echo 'CLISP_LINKKIT = $$($(CLISP) -b)/linkkit'
       echo "LN = ln"
       echo "MAKE = make"
       echo "SHELL = /bin/sh"
       echo
       echo "DISTRIBFILES ="
       echo "distribdir ="
       echo
       for fc in $files_c; do
         fo=`echo "$fc" | sed -e 's,\.c$,,'`.o
         echo "$fo : \$(srcdir)/$fc"
         echotab '$(CC) $(CPPFLAGS) $(CFLAGS) -I$(CLISP_LINKKIT) -c $<'
         echo
       done
       echo "clisp-module :$files_o"
       echo
       echo 'clisp-module-distrib : clisp-module force'
       echotab '$(LN) $(DISTRIBFILES) $(distribdir)'
       echo
      ) > "$moduledir"/Makefile
      (echo "file_list=''"
       echo "mod_list=''"
       for fc in $files_c; do
         fo=`echo "$fc" | sed -e 's,\.c$,,'`.o
         mod=`echo "$fc" | sed -e 's,\.c$,,' | sed -e 's,[^A-Za-z0-9_],_,g'`
         # The last sed command must agree with foreign1.lisp:to-module-name.
         echo 'if test -r '"$fc"'; then'
         echo '  file_list="$file_list"'"' $fo'"
         echo '  mod_list="$mod_list"'"' $mod'"
         echo 'fi'
       done
       echo 'make clisp-module CC="${CC}" CPPFLAGS="${CPPFLAGS}" CFLAGS="${CFLAGS}" CLISP_LINKKIT="$absolute_linkkitdir" SHREXT=${SHREXT} $(CLISP)=${CLISP}'
       echo 'NEW_FILES="$file_list"'
       echo 'NEW_LIBS="$file_list"'
       echo 'NEW_MODULES="$mod_list"'
       echo "TO_LOAD=''"
       echo "TO_PRELOAD=''"
      ) > "$moduledir"/link.sh
    fi
    ;;

  add)
    # Usage: clisp-link add source-dir destination-dir moduledir...
    if [ $# -lt 3 ] ; then
      echo "Usage: $0 add source-dir destination-dir moduledir..." 1>&2
      exit 1
    fi
    sourcedir="$2"
    destinationdir="$3"
    shift
    shift
    shift
    moduledirs="$@"
    check_dir "$sourcedir"
    make_dest "$destinationdir"
    for moduledir in $moduledirs; do check_dir "$moduledir"; done
    absolute_currentdir=`/bin/pwd`
    absolute_sourcedir=`cd "$sourcedir" ; /bin/pwd`
    absolute_destinationdir=`cd "$destinationdir" ; /bin/pwd`
    installbasedir=`dirname "$sourcedir"`
    # What to do if we abort.
    trap 'rm -rf "$absolute_destinationdir"' 1 2 15
    test "$absolute_sourcedir" = "$absolute_destinationdir" &&
      fail "directories $sourcedir and $destinationdir may not be the same"
    check_linkset "$sourcedir"
    for moduledir in $moduledirs; do check_module "$moduledir"; done
    # Read the variables CC, CPPFLAGS, CFLAGS, CLFLAGS, LIBS, X_LIBS, RANLIB, FILES
    . "$sourcedir"/makevars
    if [ -z "$moduledirs" ] ; then
      # Just make links from $destinationdir to $sourcedir
      lncp_some "$sourcedir" "$destinationdir" ${LISPRUN} lispinit.mem modules.h modules.o makevars ${FILES};
    else
      cp "$sourcedir"/modules.h "$destinationdir"/modules.h
      chmod +w ""$destinationdir"/modules.h"
      FILES=`lncp_some "$sourcedir" "$destinationdir" ${FILES}`
      # Prepare the module directories and read their variables
      PRELOAD=''
      LOAD=''
      for moduledir in $moduledirs; do
        modulename=`basename "$moduledir"`
        # Prepare the module directory and read the variables NEW_FILES, NEW_LIBS
        NEW_FILES=''
        NEW_LIBS=''
        NEW_MODULES=''
        TO_PRELOAD=''
        TO_LOAD=''
        SHREXT=.so
        cd "$moduledir"
        . ./link.sh
        cd "$absolute_currentdir"
        for mod in $NEW_MODULES ; do # update modules.h
          echo 'MODULE('"$mod"')' >> "$destinationdir"/modules.h
        done
        FILES=${FILES}' '`lncp_some "$moduledir" "$destinationdir" ${NEW_FILES}`
        LIBS=${NEW_LIBS}' '${LIBS}
        for f in $TO_PRELOAD; do
          PRELOAD=${PRELOAD}' -i '"$moduledir/$f"
        done
        for f in $TO_LOAD; do
          LOAD=${LOAD}' -i '"$moduledir/$f"
        done
        cd "$destinationdir"
        prepare_dynamic_module
        cd "$absolute_currentdir"
      done
      start_dir=`pwd`
      cd "$destinationdir"
      make_lisprun
      cd "${start_dir}"
      if [ -n "$PRELOAD" ] ; then
        # Generate new preliminary lispinit.mem
        verbose "$sourcedir"/${LISPRUN} -B "$installbasedir" -M "$sourcedir"/lispinit.mem -norc -q ${PRELOAD} -x "(saveinitmem \"$destinationdir/lispinit.mem\")"
      fi
      # Generate new lispinit.mem
      if [ -n "$PRELOAD" ] ; then
        verbose "$destinationdir"/${LISPRUN} -B "$installbasedir" -M "$destinationdir"/lispinit.mem -norc -q ${LOAD} -x "(saveinitmem \"$destinationdir/lispinit.mem\")"
      else
        verbose "$destinationdir"/${LISPRUN} -B "$installbasedir" -M "$sourcedir"/lispinit.mem -norc -q ${LOAD} -x "(saveinitmem \"$destinationdir/lispinit.mem\")"
      fi
      # Generate new makevars
      sed_escape_commas='s/,/\\,/g'
      LIBS_escaped=`echo "$LIBS" | sed -e "$sed_escape_commas"`
      sed -e "s,^LIBS=.*\$,LIBS='${LIBS_escaped}'," -e "s,^FILES=.*\$,FILES='${FILES}'," < "$sourcedir"/makevars > "$destinationdir"/makevars
    fi
    # Done.
    trap '' 1 2 15
    ;;

  run)
    # This is functionally the same as an add command, followed
    # by running the resulting linking set, but is faster and requires less
    # disk space if dynamic loading is available.
    # Usage: clisp-link run source-dir moduledir...
    if [ $# -lt 2 ] ; then
      echo "Usage: $0 run source-dir moduledir..." 1>&2
      exit 1
    fi
    sourcedir="$2"
    installbasedir=`dirname "$sourcedir"`
    shift
    shift
    if test "$with_dynamic_modules" != no; then
      moduledirs="$@"
      check_dir "$sourcedir"
      for moduledir in $moduledirs; do check_dir "$moduledir"; done
      absolute_currentdir=`/bin/pwd`
      check_linkset  "$sourcedir"
      for moduledir in $moduledirs; do check_module "$moduledir"; done
      # Read the variables CC, CPPFLAGS, CFLAGS, CLFLAGS, LIBS, X_LIBS, RANLIB, FILES
      . "$sourcedir"/makevars
      if [ -z "$moduledirs" ] ; then
        "$sourcedir"/${LISPRUN} -B "$installbasedir" -M "$sourcedir"/lispinit.mem
      else
        func_tmpdir
        FILES=`lncp_some "$sourcedir" "$tmp" ${FILES}`
        # Prepare the module directories and read their variables
        PRELOAD=''
        LIBS=''
        MODULES=''
        LOAD=''
        for moduledir in $moduledirs; do
          modulename=`basename "$moduledir"`
          # Prepare the module directory and read the variables NEW_FILES, NEW_LIBS
          NEW_FILES=''
          NEW_LIBS=''
          NEW_MODULES=''
          TO_PRELOAD=''
          TO_LOAD=''
          SHREXT=.so
          cd "$moduledir"
          . ./link.sh
          cd "$absolute_currentdir"
          for f in $TO_PRELOAD; do
            PRELOAD=${PRELOAD}' '"$moduledir/$f"
          done
          FILES=${FILES}' '`lncp_some "$moduledir" "$tmp" ${NEW_FILES}`
          LIBS=${NEW_LIBS}' '${LIBS}
          for mod in $NEW_MODULES; do
            MODULES=${MODULES}' '"$mod"
          done
          for f in $TO_LOAD; do
            LOAD=${LOAD}' '"$moduledir/$f"
          done
        done
        tmpsharedlib="$tmp/clisplink.so"
        tmpinitlisp="$tmp/clisplink.lisp"
        # What to do if we abort.
        trap 'rm -rf "$tmp"' 0 1 2 15
        # Create an initialization file with a couple of load forms.
        (for f in $PRELOAD; do echo "(load \"${f}\")"; done
         echo "(system::dynload-modules \"$tmpsharedlib\" (quote ("
         for mod in $MODULES; do echo "  \"${mod}\""; done
         echo ")))"
         for f in $LOAD; do echo "(load \"${f}\")"; done ) > "$tmpinitlisp"
        # Create a shared library.
        start_dir=`pwd`; cd $tmp;
        lib="$tmpsharedlib"; libs="$LIBS"; verbose 
        cd "$start_dir"
        # Run clisp, attach the shared library and load the Lisp stuff.
        "$sourcedir"/${LISPRUN} -B "$installbasedir" -M "$sourcedir"/lispinit.mem -i "$tmpinitlisp"
        rm -rf "$tmp"
        trap '' 0 1 2 15
      fi
    else
      func_tmpdir
      destinationdir="$tmp"
      # What to do if we abort.
      trap 'rm -rf "$tmp"' 0 1 2 15
      rm -rf $destinationdir # must not exist for make_dest; bug #[ 1469663 ]
      "$0" add "$sourcedir" "$destinationdir" "$@" && "$destinationdir"/${LISPRUN} -B "$installbasedir" -M "$destinationdir"/lispinit.mem
      rm -rf "$tmp"
      trap '' 0 1 2 15
    fi
    ;;

  install)
    # Usage: clisp-link install moduledir...
    if [ $# -lt 1 ] ; then
      echo "Usage: $0 install moduledir..." 1>&2
      exit 1
    fi
    sourcedir=`current_linking_set`
    shift
    moduledirs="$@"
    absolute_currentdir=`/bin/pwd`
    absolute_sourcedir=`cd "$sourcedir" ; /bin/pwd`
    for moduledir in $moduledirs; do
      check_dir "$moduledir"
      check_module "$moduledir"
      test -r "${moduledir}"/Makefile || \
        fail "No Makefile in ${moduledir}, cannot install"
    done
    # Read the variables CC, CPPFLAGS, CFLAGS, CLFLAGS, LIBS, X_LIBS, RANLIB, FILES
    . "$sourcedir"/makevars
    # Prepare the module directories and read their variables
    for moduledir in $moduledirs; do
      modulename=`basename "$moduledir"`
      # Prepare the module directory
      NEW_FILES=''
      NEW_LIBS=''
      NEW_MODULES=''
      TO_PRELOAD=''
      TO_LOAD=''
      SHREXT=.so
      cd "$moduledir"
      absolute_moduledir=`/bin/pwd`
      . ./link.sh
      prepare_dynamic_module  # sets LIBDIR
      mkdir -p "${LIBDIR}/$moduledir"
      # when running "CLISP=./clisp ./clisp-link install <modname>"
      # in the build directory, avoid "cp: `...' and `...' are the same file"
      absolute_distribdir=`cd "${LIBDIR}/$moduledir"; /bin/pwd`
      test "${absolute_moduledir}" = "${absolute_distribdir}" || \
        make clisp-module-distrib LN=cp distribdir="${LIBDIR}/$moduledir"
      cd "$absolute_currentdir"
    done
    ;;

  *) usage;;
esac

