#!/bin/bash

set -e

###############################################
###
### check for environment variables
###

if test -z $MAKE; then
  MAKE=make
fi

###############################################
###
### read lib
###

canonicalname(){
    if test $# -ne 1; then
        echo Usage: canonicalname path >&2
        return 1
    fi
    file="`eval echo $1`" # expand ~
    if test ! -e "$file"; then
        echo $file: file not found >&2
        return 1
    fi
    # if this is a symlink, then follow the symlink
    if test -L "$file"; then
        fdir="`dirname \"$file\"`"
        flink="`readlink \"$file\"`"
        if test -e "$flink"; then
            # these are absolute links, or links in the CWD
            canonicalname "$flink"
        else
            canonicalname "$fdir/$flink"
        fi
    else
        # if this is a file, then remember the filename and
        # canonicalize the directory name
        if test -f "$file"; then
            fdir="`dirname \"$file\"`"
            fname="`basename \"$file\"`"
            fdir="`canonicalname \"$fdir\"`"
            echo "$fdir/$fname"
        fi
        # if this is a directory, then create an absolute
        # directory name and we are done
        if test -d "$file"; then
            (cd "$file"; pwd)
        fi
    fi
}

canonicalpath(){
  if test $# -ne 1; then
     echo Usage: canonicalpath path >&2
     return 1
  fi
  dirname "`canonicalname "$1"`"
}

checkdebug () {
  while test $# -gt 0; do
    if test x$1 = x--debug; then
      echo yes
      return
    fi
    shift
  done
  echo no
}

DEBUG=`checkdebug $@`
if test "x$DEBUG" = "xyes"; then
  set -x
  set -v
fi

export PREFIX_DIR="`canonicalpath "$0"`/.."

# create PKG_CONFIG_PATH for installed dune modules
if test -d "$PREFIX_DIR/lib/pkgconfig"; then
  export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$PREFIX_DIR/lib/pkgconfig"
fi

# Read the modules find part
. "$PREFIX_DIR/lib/dunemodules.lib"

###############################################

onbuildfailure() {
  echo "Terminating $(basename "$0") due to previous errors!" >&2
  exit 1
}

#
# for each module load the $CONTROL script part and run $command
#
# parameters:
# $1 list of modules
# $2-$* commands + parameters to execute
#
build_module() {
  local module=$1
  shift
  while test $# -gt 0; do
    # get command
    command=$1
    shift

    # only load other parameters
    load_opts NONE
    # get command options
    CMD_FLAGS=
    while test $# -gt 0 && test "$1" != ":"; do
      COMMAND=$(echo $command | tr '[:lower:]' '[:upper:]')
      # setup paramter list
      CMD_FLAGS="$CMD_FLAGS \"$1\""
      shift
    done
    if test -z "$CMD_FLAGS"; then
      load_opts $command
    else
      # disable usage of opts file
      if test "x$DUNE_OPTS_FILE" != "x"; then
        echo "WARNING: commandline parameters will overwrite setting in opts file \"$DUNE_OPTS_FILE\""
      fi
    fi

    # skip command delimiter
    if test "$1" = ":"; then shift; fi

    # actually run the commands (we already know that these are valid commands)
    local runcommand=run_$command

    # build the modules
    local path="$(eval "echo \$PATH_${module}")"
    eval echo "--- calling $command for \$NAME_${module} ---"
	trap onbuildfailure EXIT
    if ! (
      set -e
      cd "$path"
      export module
      eval_control $runcommand "$path/$CONTROL"
    ); then eval echo "--- Failed to build \$NAME_${module} ---"; exit 1; fi
	trap onfailure EXIT

    eval echo "--- \$NAME_${module} done ---"
  done
}

#
# load command options from an opts file
# the name of the opts file is stored in the global variable $DUNE_OPTS_FILE
#
# parameters:
# $1 command
#
load_opts() {
  local command=$1
  local COMMAND=$(echo $command | tr '[:lower:]' '[:upper:]')
  CMD_FLAGS="$(eval echo \$${COMMAND}_FLAGS)"
  local CMD_FLAGS_FROM_FILE=""
  if test "$command" = "NONE"; then
    BUILDDIR=$DUNE_BUILDDIR
    USE_CMAKE=$DUNE_USE_CMAKE
    if test "x$DUNE_OPTS_FILE" != "x"; then
      if test -z "$BUILDDIR"; then
        # no builddir set yet, use build dir from opts file if set
        # Note: if --use-buiddir is used BUILDDIR will be set already
        OPTS_FILE_BUILDDIR="$(eval BUILDDIR=""; . $DUNE_OPTS_FILE; eval echo \$BUILDDIR)"
        if test -n "$OPTS_FILE_BUILDDIR"; then
          BUILDDIR="$OPTS_FILE_BUILDDIR"
        fi
      fi
      if test -z "$USE_CMAKE"; then
        # no USE_CMAKE set yet, use USE_CMAKE from opts file if set
        # Note: if --use-cmake is used USE_CMAKE will be set already
        OPTS_FILE_USE_CMAKE="$(eval USE_CMAKE=""; . $DUNE_OPTS_FILE; eval echo \$USE_CMAKE)"
        if test -n "$OPTS_FILE_USE_CMAKE"; then
          USE_CMAKE="$OPTS_FILE_USE_CMAKE"
        fi
      fi
      if test -n "$USE_CMAKE" && test -z "$CMAKE"; then
	# We use cmake for building, but CMAKE is not yet set.
	# Check the opts file for it
        OPTS_FILE_CMAKE="$(eval CMAKE=""; . $DUNE_OPTS_FILE; eval echo \$CMAKE)"
        if test -n "$OPTS_FILE_CMAKE"; then
          CMAKE="$OPTS_FILE_CMAKE"
        fi
      fi
    fi
  fi
  if test -n "$USE_CMAKE" && test -z "$CMAKE"; then
       # fall back to system cmake
          CMAKE=cmake
  fi
  if test "x$DUNE_OPTS_FILE" != "x"; then
    if test "$command" = "configure"; then
      CMAKE_FLAGS="$(. $DUNE_OPTS_FILE; eval echo \$CMAKE_FLAGS)"
    fi
    CMD_FLAGS_FROM_FILE="$(eval ${COMMAND}_FLAGS=""; . $DUNE_OPTS_FILE; eval echo \$${COMMAND}_FLAGS)"
  fi
  if test -n "$CMD_FLAGS_FROM_FILE"; then
    echo "----- using default flags \$${COMMAND}_FLAGS from $DUNE_OPTS_FILE -----"
    CMD_FLAGS=$CMD_FLAGS_FROM_FILE
  elif test -n "$CMD_FLAGS"; then
    echo "----- using default flags \$${COMMAND}_FLAGS from environment -----"
  fi
  
  if test "x$USE_CMAKE" = "xyes"; then
    if test -z "$BUILDDIR"; then
      echo "No build directory provided. Defaulting to the sub directory build-cmake"
      export BUILDDIR=build-cmake
    fi
  fi
}

###############################################
###
### Commands
###

# check all parameter
check_commands() {
  while test $# -gt 0; do
    # get command
    command=$1
    shift
    # skip command options
    while test $# -gt 0 && test "$1" != ":"; do
      shift
    done
    # skip command delimiter
    if test "$1" = ":"; then shift; fi
    # test the commands
    if ! is_command $command; then
      usage
      echo "ERROR: unknown command \"$command\""  >&2
      exit 1
    fi
  done
}

# check wheteher the parameter is valid command or not
is_command() {
eval '
case "$1" in
  '`echo $COMMANDS | sed -e 's/ / | /g'`')
    return 0
    ;;
  *)
    return 1
    ;;
esac'
}

# list of all dunecontrol commands
COMMANDS="printdeps vcsetup update autogen configure make all exec bexec status svn git"

# help string for the commands
printdeps_HELP="print recursive dependencies of a module"
vcsetup_HELP="setup version control repository (Git etc.) or working copy (SVN)"
update_HELP="updated all modules from the repository"
autogen_HELP="run the autogen.sh script for each module. Does nothing, if CMake is activated"
configure_HELP="run configure or cmake for each module"
make_HELP="run make for each module"
all_HELP="\trun 'autogen', 'configure' and 'make' command for each module"
exec_HELP="execute an arbitrary command in each module source directory"
bexec_HELP="execute an arbitrary command in each module build directory"
status_HELP="show vc status for all modules"
svn_HELP="\trun svn command for each svn managed module"
git_HELP="\trun git command for each git managed module"

#
# setup command proxies
# call will be forwarded to run_default_$command
#

for command in $COMMANDS; do
  eval "run_$command () { run_default_$command; }"
done

#
# default implementations for commands...
# these can be overwritten in the $CONTROL files
#

run_default_exec () { bash -c "eval $CMD_FLAGS"; }

run_default_bexec () {
  if test -d "$BUILDDIR"; then
    bash -c "cd \"$BUILDDIR\" && eval $CMD_FLAGS";
  else
    eval echo "Build directory \\\"$BUILDDIR\\\" not found, skipping bexec for \$NAME_${module}"
  fi
}

run_default_status () {
  local verbose=0
  local update=""
  local is_git=""
  local is_svn=""
  name="$(eval echo \$NAME_$module)"

  if test -d .git; then is_git=1; fi
  if test -d .svn; then is_svn=1; fi
  if test ! "$is_svn" -a ! "$is_git" ; then
    echo "module $name not under known version control"
    return
  fi

  for i in $CMD_FLAGS; do
    if eval test "x$i" = "x-v"; then verbose=1; fi
    if eval test "x$i" = "x-vv"; then verbose=2; fi
    if eval test "x$i" = "x-u"; then update="-u"; fi
  done
  # is out output connected to a tty?
  if test -t 1; then
    blue="\e[1m\e[34m"
    green="\e[1m\e[32m"
    red="\e[1m\e[31m"
    reset="\e[0m\e[0m"
  fi

  if test $verbose -eq 1; then
    test "$is_svn" && svn status $update | grep -E "^M|^A|^D|^C|^U"
    test "$is_git" && git status -uno
  elif test $verbose -eq 2; then
    test "$is_svn" && svn status $update
    test "$is_git" && git status
  fi


  if test "$is_svn" ; then
    changed=$(svn status | grep -E "^M|^A|^D" | wc -l)
    collisions=$(svn status | grep -E "^C"| wc -l)
    pending=$(svn status $update | grep -E "^...... \* " | wc -l)
  fi
  if test "$is_git" ; then
    changed=$(git status --porcelain | grep -E "^ *M|^ *A|^ *D|^ *R|^ *C" | wc -l)
    collisions=$(git status --porcelain | grep -E "^ *U"| wc -l)
    pending=$(git status | grep -E "^\# Your branch is ahead |^\# Your branch is behind " | wc -l)
  fi
  color=$green
  text="no changes"
  if [ $changed -eq 0 ]; then
    true
  elif [ $changed -eq 1 ]; then
    color=$blue;
    text="1 change"
  else
    color=$blue;
    text="$changed changes"
  fi
  if [ $pending -eq 0 ]; then
    true
  elif [ $pending -eq 1 ]; then
    color=$blue;
    text="$text, 1 update pending"
  else
    color=$blue;
    text="$text, $pending updates pending"
  fi
  if [ $collisions -eq 0 ]; then
    true
  elif [ $collisions -eq 1 ]; then
    color=$red
    text="$text, 1 collision"
  else
    color=$red
    text="$text, $count collisions"
  fi
  echo -e "$color[$text]$reset $name"
}

run_default_vcsetup() {
  # load user options
  if [ -n "$CMD_FLAGS" ]; then
    eval "$CMD_FLAGS"
  fi

  # Check for both a file and a directory to cope with Git submodules
  if [ -d .git -o -f .git ] ; then

    # Read Whitespace-Hook setting from dune.module file
    local SETUPGITHOOK="$($GREP -i "^[$BLANK]*Whitespace-Hook:" dune.module | cut -d ':' -f2 | eval $PARSER_TRIM | tr '[:upper:]' '[:lower:]')"

    if [ "x$SETUPGITHOOK" = "xyes" ]; then
      # we have to install the Git whitespace hook

      # The current Git repository might be a submodule, so we have to start by
      # determining the location of the commit hook

      if [ -f .git ] ; then
        # submodule -> .git contains a pointer to the repository
        GITHOOKPATH="$(sed 's/gitdir: //' < .git)/hooks/pre-commit"
      else
        # standard case, .git is the repository
        GITHOOKPATH=.git/hooks/pre-commit
      fi

      if [ -n "$DISABLEWHITESPACEHOOK" ] ; then
        # the user doesn't want the Git whitespace hook - deinstall it if necessary and warn the user
        echo "WARNING: The current module wants to install the DUNE whitespace hook, but you have disabled the hook in your options!"
        echo "WARNING: You will have to make sure that your commits don't introduce any trailing whitespace or indentation with tabs!"
        echo "WARNING: Otherwise, your commits might be rejected when trying to push them to an official repository!"

        if [ -e "$GITHOOKPATH" ]; then
          # there is a pre-commit hook, check whether it is our whitespace hook
          local HOOKTAG="$(eval head -n 2 \"$GITHOOKPATH\" | tail -n 1)"
          if [ "x$HOOKTAG" = "x# dune-git-whitespace-hook" ]; then
            echo "--> Removing DUNE whitespace hook as requested by the user"
            rm "$GITHOOKPATH"
          fi
        fi
      else
        # standard handling of Git whitespace hook
        if [ ! -e "$GITHOOKPATH" ]; then
          # there is no hook yet, we can safely install ours
          echo "--> Installing Git pre-commit hook to enforce whitespace policy"
          cp -p "$PREFIX_DIR/bin/git-whitespace-hook" "$GITHOOKPATH"
        else
          # there is already a hook, check whether it is our whitespace hook
          local HOOKTAG="$(eval head -n 2 \"$GITHOOKPATH\" | tail -n 1)"
          if [ "x$HOOKTAG" = "x# dune-git-whitespace-hook" ]; then
            if [ "$PREFIX_DIR/bin/git-whitespace-hook" -nt "$GITHOOKPATH" ]; then
              echo "--> Updating Git pre-commit hook with newer version"
              cp -p "$PREFIX_DIR/bin/git-whitespace-hook" "$GITHOOKPATH"
            fi
          else
            echo "WARNING: Existing pre-commit hook found!"
            echo "WARNING: Skipping installation of DUNE whitespace hook!"
            echo "WARNING: If you want to contribute patches to DUNE, you should make sure to call the whitespace hook"
            echo "WARNING: (dune-common/bin/git-whitespace-hook) from you custom pre-commit hook, otherwise your commits"
            echo "WARNING: might contain trailing whitespace and will not apply cleanly to the official repositories!"
          fi
        fi
      fi
    fi

    # Apply git configuration settings
    if [ -f .vcsetup/config ]; then
      echo -n "--> Setting Git configuration entries... "
      cat .vcsetup/config | while read; do
        # Filter out comments
        local COMMENT="$(echo $REPLY | $GREP '^#')"
        if [ ! "x$COMMENT" = "x$REPLY" ]; then
          # parse line into an array first to catch obvious syntax errors
          # like 'option value; rm -rf /'
          eval local GIT_ARGS=($REPLY)
          git config "${GIT_ARGS[@]}"
        fi
      done
      echo "done"
    fi

    # Apply user supplied configuration settings
    if [ -n "$GIT_CONFIG_FILE" ]; then
      if [ -f "$GIT_CONFIG_FILE" ]; then
        echo -n "--> Setting custom Git configuration entries from '$GIT_CONFIG_FILE'... "
        cat "$GIT_CONFIG_FILE" | while read; do
          # Filter out comments
          local COMMENT="$(echo $REPLY | $GREP '^#')"
          if [ ! "x$COMMENT" = "x$REPLY" ]; then
            # parse line into an array first to catch obvious syntax errors
            # like 'option value; rm -rf /'
            eval local GIT_ARGS=($REPLY)
            git config "${GIT_ARGS[@]}"
          fi
        done
        echo "done"
      else
        echo "WARNING: custom Git config file '$GIT_CONFIG_FILE' not found!"
      fi
    fi

  fi

  # Run custom setup scripts
  if [ -d .git -o -f .git -o -d .svn -o -d CVS -o -f stamp-vc ]; then
    if [ -d .vcsetup/run.d ]; then
      for SCRIPT in .vcsetup/run.d/* ; do
        if [ -x "$SCRIPT" ]; then
          echo "--> Running $SCRIPT"
          "$SCRIPT"
        fi
      done
    fi
  fi
}

run_default_update () {
  DUNELINK=0
  if test -L dune; then
    rm dune
    DUNELINK=1
  fi
  if test -d .svn; then
    svn update
  elif test -d CVS; then
    cvs update -dP
  elif test -d .git; then
      if test -d ".git/svn" && test -n "`git svn find-rev HEAD`"; then
          # If the current HEAD points to a SVN commit, update via git-svn
          git svn rebase
      else
          # Update all remotes (if any)
          git remote update

          # merge all changes fast-forward style if possible
          if ! git merge --ff-only FETCH_HEAD 2> /dev/null; then
              echo "$module seems to be using git, and could not be"
              echo "updated automatically. Please update it manually."
              echo "(Usually, this is done via 'git svn rebase' for modules using"
              echo "subversion or 'git merge' for modules which use git natively."
              echo "Conflicts can be resolved using 'git mergetool'.)"
          fi
      fi
  else
    echo "WARNING: $module is not under a known version control system."
    echo "         We support svn, git and cvs."
  fi
  if test "$DUNELINK" != 0 && ! test -d dune; then
    echo "WARNING: $module is using the deprecated dune symlink"
    ln -s . dune
  fi
}

run_default_autogen () {
  if test "x$USE_CMAKE" != "xyes" || test  ! -e "$(eval "echo \$PATH_$module")/CMakeLists.txt" ; then
    PARAMS="$CMD_FLAGS"
    local M4_PATH=""
    if test -f configure.ac && \
       ( test -d .svn || test -d .git || test -d CVS || test -f stamp-vc ); then
      sort_modules $MODULES
      for m in $MODULES; do
        path="$(eval "echo \$PATH_$m")"
        MODULE_PATHS="$MODULE_PATHS\"$path\" "
      done
      if test -f autogen.sh; then
        eval echo "WARNING: \$NAME_$module contains obsolete autogen.sh," \
            >&2
        echo "         dune-autogen is used instead." >&2
      fi
      eval "\"$PREFIX_DIR/bin/dune-autogen\"" "$MODULE_PATHS" "$PARAMS" || exit 1
    else
      echo Skipping dune-autogen
    fi
  else
    echo Skipping dune-autogen because of CMake
  fi
}

run_default_configure () {
  PARAMS="$CMD_FLAGS"
  if test "x$USE_CMAKE" = "xyes" && test -e "$(eval "echo \$PATH_$module")/CMakeLists.txt"; then
    LOCAL_USE_CMAKE=yes
  else
    LOCAL_USE_CMAKE=no
  fi

  if test -x configure || test "x$LOCAL_USE_CMAKE" = "xyes" ; then
    ACLOCAL_FLAGS="-I ."
    if test -d "m4"; then
      ACLOCAL_FLAGS="$ACLOCAL_FLAGS -I m4"
    fi
    MY_MODULES=
    # get dependencies & suggestions
    sort_modules $module
    for m in $MODULES; do
      path="$(eval "echo \$PATH_$m")"
      if test "x$LOCAL_USE_CMAKE" = "xyes"; then
          #
          # Translate the configure PARMS to cmake
          export PARAMS
          export CMAKE_PARAMS
          module_translate_options_am2cmake $m $path/lib
      fi
      if test x$module = x$m; then continue; fi # skip myself
      name=$(eval "echo \$NAME_$m")
      if test -d "$path/m4"; then
          ACLOCAL_FLAGS="$ACLOCAL_FLAGS -I $path/m4"
      fi
      if test -d "$path/share/aclocal"; then
          ACLOCAL_FLAGS="$ACLOCAL_FLAGS -I $path/share/aclocal"
      fi
      if test -d "$path/$BUILDDIR"; then
        PARAMS="$PARAMS \"--with-$name=$path/$BUILDDIR\""
      else
        PARAMS="$PARAMS \"--with-$name=$path\""
      fi
      if test "x$LOCAL_USE_CMAKE" = "xyes"; then
          if test -d "$path/$BUILDDIR"; then
	      CMAKE_PARAMS="$CMAKE_PARAMS \"-D""$name""_DIR=$path/$BUILDDIR\""
          else
              if test -d "$path/lib/cmake/$name"; then
                  CMAKE_PARAMS="$CMAKE_PARAMS \"-D""$name""_DIR=$path/lib/cmake/$name\""
              else
                  CMAKE_PARAMS="$CMAKE_PARAMS \"-D""$name""_DIR=$path\""
              fi
          fi
      fi
    done

    if test "x$HAVE_duneweb" == "xyes"; then
      PARAMS="$PARAMS \"--with-duneweb=$PATH_duneweb\""
    fi

    if test "x$LOCAL_USE_CMAKE" = "xyes"; then
      # we have to export the compiler and compiler flags
      # such that they are honored by cmake.
      flags="CXX CC CXXFLAGS CFLAGS CPPFLAGS LDFLAGS F77 FFLAGS FLIBS FC FCFLAGS FCLIBS LIBS"
      for i in  $flags; do
        cflags=`echo "$PARAMS" | sed "s/.*\($i=\"[^\"]*\"\|$i='[^']*'\|$i=[^\s^ ]*\).*/\1/"`
        if test "$cflags" != "$PARAMS"; then
            PREPARAMS="$PREPARAMS $cflags"
        fi
      done
      # create build directory if requested
      test -d "$BUILDDIR" || mkdir "$BUILDDIR"
      SRCDIR="$PWD"
      cd "$BUILDDIR"
      echo "$PREPARAMS $CMAKE -DBUILD_SHARED_LIBS:BOOL=OFF -DCMAKE_MODULE_PATH=\"$CMAKE_MODULE_PATH\" $CMAKE_PARAMS $CMAKE_FLAGS \"$SRCDIR\""
      eval $PREPARAMS $CMAKE "-DBUILD_SHARED_LIBS:BOOL=OFF -DCMAKE_MODULE_PATH=\"$CMAKE_MODULE_PATH\" $CMAKE_PARAMS $CMAKE_FLAGS \"$SRCDIR\"" || exit 1
    else
      PARAMS="$PARAMS ACLOCAL_AMFLAGS=\"$ACLOCAL_FLAGS\""
      echo ./configure "$PARAMS"
      # create build directory if requested
      if test -n "$BUILDDIR"; then
        test -d "$BUILDDIR" || mkdir "$BUILDDIR"
        SRCDIR="$PWD"
        cd "$BUILDDIR"
        eval "$SRCDIR/configure" "$PARAMS" || exit 1
      else
        eval ./configure "$PARAMS" || exit 1
      fi
    fi
  else
    if test -f configure.in || test -f configure.ac; then
      echo "ERROR: configure.[in|ac] found, but configure missing." >&2
      echo "Did you forget to run autoconf?" >&2
      echo "Perhaps you didn't update your project to" >&2
      echo "the latest buildsystem changes (FS#382)." >&2
      echo "If your project is under version control, please make sure" >&2
      echo "you have a file stamp-vc in you top_srcdir." >&2
      exit 1
    fi
  fi
}

run_default_make () {
  test ! -d "$BUILDDIR" || cd "$BUILDDIR"
  PARAMS="$CMD_FLAGS"
  echo make "$PARAMS"
  eval $MAKE "$PARAMS"
}

run_default_all () {
  for cmd in vcsetup autogen configure make; do
    eval echo "--- calling $cmd for \$NAME_${module} ---"
    load_opts $cmd
    run_$cmd
  done
}

run_default_svn () {
  if test -d .svn; then
    PARAMS="$CMD_FLAGS"
    eval svn "$PARAMS"
  fi
}

run_default_git () {
  if test -d .git; then
    PARAMS="$CMD_FLAGS"
    eval git "$PARAMS"
  fi
}

###############################################
###
### main
###

onfailure() {
  echo "Execution of $(basename "$0") terminated due to errors!" >&2
  exit 1
}

usage () {
  (
    echo "Usage: $(basename "$0") [OPTIONS] COMMANDS [COMMAND-OPTIONS]"
    echo ""
    echo "  Execute COMMANDS for all Dune modules found. All entries in the"
    echo "  DUNE_CONTROL_PATH variable are scanned recursively for Dune modules."
    echo "  If DUNE_CONTROL_PATH is empty, the current directory is scanned."
    echo "  Dependencies are controlled by the $CONTROL files."
    echo ""
    echo "OPTIONS:"
    echo "  -h, --help          show this help"
    echo "      --debug         enable debug output of this script"
    echo "      --use-cmake     use cmake instead autotools for building"
    echo "      --module=mod    only apply the actions on module mod"
    echo "                      and all modules it depends on"
    echo "      --only=mod      only apply the actions on module mod"
    echo "                      and not the modules it depends on"
    echo "      --current       only apply the actions on the current module,"
    echo "                      the one whose source tree we are standing in"
    echo "      --resume        resume a previous run (only consider the modules"
    echo "                      not built successfully on the previous run)"
    echo "      --skipfirst     skip the first module (use with --resume)"
    echo "      --opts=FILE     load default options from FILE"
    echo "                      (see dune-common/doc/example.opts)"
    echo "      --builddir=NAME make out-of-source builds in a subdir NAME."
    echo "                      This directory is created inside each module."
    echo "      --[COMMAND]-opts=opts   set options for COMMAND"
    echo "                     (this is mainly useful for the 'all' COMMAND)"
    echo "COMMANDS:"
    echo "  Colon-separated list of commands. Available commands are:"
    printf "  \`help'\tguess what :-)\n"
    printf "  \`print'\tprint the list of modules sorted after their dependencies\n"
    printf "  \`info'\tsame as \`print\', but including whether it is a dependency or suggestion\n"
    for i in $COMMANDS; do
      printf "  \`$i'\t$(eval echo \$${i}_HELP)\n"
    done
    printf "  \`export'\trun eval \`dunecontrol export\` to save the list of\n"
    printf "  \t\tdune.module files to the DUNE_CONTROL_PATH variable\n"
    echo
  )  >&2
}

# create the module list
create_module_list() {
  # try to get the resume file name from the options
  if test -z "$RESUME_FILE" && test -n "$DUNE_OPTS_FILE"; then
    export RESUME_FILE="$(eval . $DUNE_OPTS_FILE; eval echo \$RESUME_FILE)"
  fi

  if test "$RESUME_FLAG" = "yes" ; then
    if ! test -s "$RESUME_FILE" ; then
      echo "Error: No previous run to resume. Please make sure that the RESUME_FILE"
      echo "       is the name of a writeable file (currently it is '$RESUME_FILE')"
      exit 1
    fi

    export MODULES=
    RESUME="`cat "$RESUME_FILE"`"
    for a in $RESUME ; do
        export NAME_`fix_variable_name $a`="$a"
        fix_and_assign MODULE "$a"
        export SEARCH_MODULES="$SEARCH_MODULES $MODULE"
        export ONLY="$ONLY $MODULE"
    done
  fi

  find_modules_in_path
  if test "x$ONLY" != x; then
    export MODULES="$ONLY"
  elif test "x$SEARCH_MODULES" != "x"; then
    sort_modules $SEARCH_MODULES
  else
    sort_modules $MODULES
  fi

  if test "x$REVERSE_FLAG" = "xyes"; then
    export MODULES="$REVERSEMODULES"
  fi

  if test "x$SKIPFIRST" = "xyes" ; then
    export MODULES=`echo $MODULES " " | cut '--delimiter= ' --fields=2-`
  fi
}

# print the module list
print_module_list() {
  DELIM=$1
  shift
  while test -n "$2"; do
    echo -n "$(eval echo \$NAME_$1)$DELIM"
    shift
  done
  echo -n "$(eval echo \$NAME_$1)"
}

trap onfailure EXIT

# clear variables
export SEARCH_MODULES=""
export MODULES=""
export ONLY=""
export RESUME_FLAG=no
export REVERSE_FLAG=no
export SKIPFIRST=no

# read environment variable USE_CMAKE
export DUNE_USE_CMAKE="$(echo $USE_CMAKE)"

# parse commandline parameters
while test $# -gt 0; do
    # get option
    command=$1
    option=$1

    # get args
    set +e
    # stolen from configure...
    # when no option is set, this returns an error code
    arg=`expr "x$option" : 'x[^=]*=\(.*\)'`
    set -e

    # switch
    case "$option" in
    --opts=*)
      if test "x$arg" = "x"; then
        usage
        echo "ERROR: Parameter for --opts is missing"  >&2
        echo  >&2
        exit 1;
      fi
      DUNE_OPTS_FILE=`canonicalname $arg`
      if ! test -r "$DUNE_OPTS_FILE"; then
        usage
        echo "ERROR: could not read opts file \"$DUNE_OPTS_FILE\""  >&2
        echo  >&2
        exit 1;
      fi
    ;;
    --*-opts=*)
      optcmd=`expr "x$option=" : 'x--\([^-]*\)-opts=.*'`
      if is_command $optcmd; then
        COMMAND=`echo $optcmd | tr '[:lower:]' '[:upper:]'`
        export ${COMMAND}_FLAGS="$arg"
      else
        usage
        echo "ERROR: unknown option \"$option\""  >&2
        exit 1
      fi
    ;;
    -h|--help)
      command=help
      break
    ;;
    -p|--print)
      command=print
      break
    ;;
    --module=*)
      if test "x$arg" = "x"; then
        usage
        echo "ERROR: Parameter for --module is missing"  >&2
        echo  >&2
        exit 1;
      fi
      for a in `echo $arg | tr ',' ' '`; do
        export NAME_`fix_variable_name $a`="$a"
        fix_and_assign MODULE "$a"
        export SEARCH_MODULES="$SEARCH_MODULES $MODULE"
      done
    ;;
    --only=*)
      if test "x$arg" = "x"; then
        usage
        echo "ERROR: Parameter for --only is missing"  >&2
        echo  >&2
        exit 1;
      fi
      for a in `echo $arg | tr ',' ' '`; do
        export NAME_`fix_variable_name $a`="$a"
        fix_and_assign MODULE "$a"
        export SEARCH_MODULES="$SEARCH_MODULES $MODULE"
        export ONLY="$ONLY $MODULE"
      done
    ;;
    --builddir=*)
      export DUNE_BUILDDIR=$arg
    ;;
    --no-builddir)
      export DUNE_BUILDDIR=""
    ;;
    --skipversioncheck)
      export SKIPVERSIONCHECK=yes
    ;;
    --current)
      while ! test -f $CONTROL; do
        cd ..
        if test "$OLDPWD" = "$PWD"; then
          echo "You are not inside the source tree of a DUNE module." >&2
          exit -1
        fi
      done;
      parse_control $PWD/$CONTROL
      fix_and_assign MODULE "$module"
      export SEARCH_MODULES="$SEARCH_MODULES $MODULE"
      export ONLY="$ONLY $MODULE"
    ;;
    --resume)
      export RESUME_FLAG="yes"
    ;;
    --reverse)
      export REVERSE_FLAG="yes"
    ;;
    --skipfirst)
      export SKIPFIRST=yes
    ;;
    --use-cmake|--cmake)
      export DUNE_USE_CMAKE=yes
    ;;
    --no-cmake)
      export DUNE_USE_CMAKE=no
    ;;
    --debug) true ;; # ignore this option, it is handled right at the beginning
    --*)
      usage
      echo "ERROR: Unknown option \`$option'"  >&2
      echo  >&2
      exit 1
      ;;
    *)
      break
    ;;
    esac

    shift
done

# we assume there should be a command...
if test "x$command" = "x"; then
  usage
  exit 1
fi

case "$command" in
  print)
    create_module_list
    eval "print_module_list ' ' $MODULES"
    echo >&2
    ;;
  info)
    create_module_list
    echo $SORTEDMODULES_INFO
  ;;
  export)
    create_module_list
    DUNE_CONTROL_PATH=""
    for mod in $MODULES; do
      path="$(eval echo \$PATH_$mod)"
      name=$(eval echo \$NAME_$mod)
      if test -f "$path/dune.module"; then
        export DUNE_CONTROL_PATH="$DUNE_CONTROL_PATH:$path/dune.module"
      else
        if test -f "$path/lib/dunecontrol/$name/dune.module"; then
          export DUNE_CONTROL_PATH="$DUNE_CONTROL_PATH:$path/lib/dunecontrol/$name/dune.module"
        else
          echo "ERROR: while creating list of dune.module files"  >&2
          echo "       couldn't find dune.module file for $name in $path" >&2
          echo  >&2
          exit 1
        fi
      fi
    done
    echo export DUNE_CONTROL_PATH=$(echo $DUNE_CONTROL_PATH | sed -e 's/^://')
    ;;
  printdeps)
    find_modules_in_path
    if test "x$SEARCH_MODULES" == "x"; then
      echo "ERROR: printdeps requires an explicit --module=... parameter"  >&2
      exit 1
    fi
    mainmod=`echo $SEARCH_MODULES`
    name=`eval echo \\${NAME_$mainmod}`
    echo "dependencies for $name"
    ### DEPENDENCIES
    sort_modules $mainmod
    for mod in $SORTEDMODULES_DEPS; do
      echo "  $mod (required)"
    done
    for mod in $SORTEDMODULES_SUGS; do
      echo "  $mod (suggested)"
    done
    ;;
  m4create)
    find_modules_in_path
    if test "x$SEARCH_MODULES" == "x"; then
      echo "ERROR: m4create requires an explicit --module=... parameter"  >&2
      exit 1
    fi
    mainmod=`echo $SEARCH_MODULES`
    eval mainmodpath="\$PATH_$mainmod"
    fname="$mainmodpath/dependencies.m4"
    name=`eval echo \\${NAME_$mainmod}`
    version=`eval echo \\${VERS_$mainmod}`
    maintainer=`eval echo \\${MAIN_$mainmod}`
    # get dependencies
    eval deps=\$DEPS_$mainmod
    #initially remove leading space
    deps=`echo "$deps" | sed 's/^ *//'`
    while test -n "$deps"; do
      #the end of the name is marked either by space, opening paren
      #or comma
      depname="${deps%%[ (,]*}"
      #remove the name and adjacent whitespace
      deps=`echo "$deps" | sed 's/^[^ (,]* *//'`
      #check whether there is a dependency version
      case "$deps" in
      '('*) deps="${deps#(}"
            depver="${deps%%)*}"
            deps="${deps#*)}"
            ;;
      *)    depver=
            ;;
      esac
      #remove any leading whitespace or commas for te next iteration
      deps=`echo "$deps" | sed 's/^[, ]*//'`

      requires="$requires $depname $depver "
    done
    # get suggestions
    eval sugs=\$SUGS_$mainmod
    #initially remove leading space
    sugs=`echo "$sugs" | sed 's/^ *//'`
    while test -n "$sugs"; do
      #the end of the name is marked either by space, opening paren
      #or comma
      sugsname="${sugs%%[ (,]*}"
      #remove the name and adjacent whitespace
      sugs=`echo "$sugs" | sed 's/^[^ (,]* *//'`
      #check whether there is a dependency version
      case "$sugs" in
      '('*) sugs="${sugs#(}"
            sugsver="${sugs%%)*}"
            sugs="${sugs#*)}"
            ;;
      *)    sugver=
            ;;
      esac
      #remove any leading whitespace or commas for te next iteration
      sugs=`echo "$sugs" | sed 's/^[, ]*//'`

      suggests="$suggests $sugsname"
      suggestsall="$suggestsall $sugsname $sugsver "
    done
    # ensure a version number
    if test "x$version" = "x"; then version="0.0"; fi
    echo "writing $fname"
    echo "    for $name $version $maintainer"
    echo "        requires $requires"
    echo "        suggests $suggestsall"
      AC_MACRO_DIR="."
      test ! -d m4 || AC_MACRO_DIR=m4
    cat > "$fname" <<EOF
# dependencies.m4 generated by dunecontrol

m4_define([DUNE_AC_INIT],[
  AC_INIT([$name], [$version], [$maintainer])
  AM_INIT_AUTOMAKE([foreign 1.9 tar-pax])
  m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([no])])
  AC_SUBST([DUNE_MOD_VERSION], [$version])
  AC_SUBST([DUNE_MOD_NAME], [$name])
  AC_SUBST([DUNE_MAINTAINER_NAME], ["$maintainer"])
  DUNE_PARSE_MODULE_VERSION([$name], [$version])
  REQUIRES="$requires"
  AC_SUBST(REQUIRES, [$REQUIRES])
  AC_CONFIG_MACRO_DIR([$AC_MACRO_DIR])
])

AC_DEFUN([DUNE_CHECK_MOD_DEPENDENCIES], [
EOF
    ### initialize AM_CONDITIONAL for suggestions that were not found
    for name in $suggests; do
      mod=$(fix_variable_name $name)
      MOD=`echo $mod | tr [:lower:] [:upper:]`
      if test "x$(eval echo \$HAVE_$mod)" = "x"; then
        cat >> "$fname" <<EOF
  ### add a conditional check for $name,
  # just in case the module is not available at autogen time
  AM_CONDITIONAL([HAVE_${MOD}], false)
EOF
      fi
    done
	### ANALYSE MODULE
    sort_modules $mainmod
    ### DEPENDENCIES
    for mod in $SORTEDMODULES_DEPS; do
      name=`eval echo \\$NAME_$mod`
      MOD=`echo $mod | tr [:lower:] [:upper:]`
      cat >> "$fname" <<EOF
  ### check dependency $name
  # invoke checks required by this module
  AC_REQUIRE([${MOD}_CHECKS])
  # invoke check for this module
  AC_REQUIRE([${MOD}_CHECK_MODULE])
  if test x\$with_$mod = xno; then
    AC_MSG_ERROR([could not find required module _dune_name])
  fi
EOF
    done
    ###
    for mod in $SORTEDMODULES_SUGS; do
      name=`eval echo \\$NAME_$mod`
      MOD=`echo $mod | tr [:lower:] [:upper:]`
      cat >> "$fname" <<EOF
  ### check suggestion $name
  # invoke checks required by this module
  AC_REQUIRE([${MOD}_CHECKS])
  # invoke check for this module
  AC_REQUIRE([${MOD}_CHECK_MODULE])
  if test x\$with_$mod = xno; then
    AC_MSG_WARN([could not find suggested module _dune_name])
  fi
EOF
    done
    ###
    # only test for the module if we really define our own checks
    if test -d m4; then
      mod=$mainmod
      name=`eval echo \\$NAME_$mod`
      MOD=`echo $mod | tr [:lower:] [:upper:]`
      cat >> "$fname" <<EOF
  ### invoke checks for $name
  AC_REQUIRE([${MOD}_CHECKS])
EOF
    fi
    cat >> "$fname" <<EOF
])
EOF
  ;;
  unexport)
    echo export DUNE_CONTROL_PATH=""
  ;;
  help)
    usage
  ;;
  *)
    set +e
    if test "x$USE_CMAKE" = "xno"; then
      echo "$PREFIX_DIR" |grep "[ 	]" >/dev/null
     if test "$?" -eq "0"; then
        echo "ERROR: The prefix directory path ($PREFIX_DIR) contains spaces. This is not"
        echo "       supported when using autotools."
        echo "       Either rename the path or activate CMake with --use-cmake switch."
        exit 1
      fi
    fi
    set -e
    if test "$1" = "update"; then export SKIPVERSIONCHECK=yes; fi
    check_commands "$@"
    create_module_list
    NAMES=""
    BUILDMODULES=""
    for mod in $MODULES; do
      if test "$(eval echo \$INST_$mod)" != "yes"; then
        NAMES="$NAMES$(eval echo \$NAME_$mod) "
        BUILDMODULES="$BUILDMODULES$mod "
      fi
    done
    echo "--- going to build $NAMES ---"
    if test -n "$RESUME_FILE"; then
        # write all modules to the resume file
        for mod in $MODULES ; do
            echo "$mod"
        done > "$RESUME_FILE"
    fi

    for mod in $BUILDMODULES; do
      build_module "$mod" "$@"

      if test -n "$RESUME_FILE"; then
          # remove the current module from the resume file
          modules_togo=`cat "$RESUME_FILE"`
          for mod_togo in $modules_togo ; do
              if test "$mod_togo" != "$mod" ; then
                  echo "$mod_togo"
              fi
          done > "$RESUME_FILE"
      fi
    done
    echo "--- done ---"
  ;;
esac

trap - EXIT