#!/bin/sh

# Copyright (C) 2006, 2007, 2008, 2009, 2010  International Business Machines
# and others.
# All Rights Reserved.
# This file is distributed under the Common Public License.
# It is part of the BuildTools project in COIN-OR (www.coin-or.org)
#
## $Id$
#
# Author: Andreas Waechter     IBM      2006-04-14
# Modified: Lou Hafer	       SFU      2010-06-11
#      Mods to allow variations from standard package structure. Decision to
#      process a configure.ac file is based on presence of COIN macros.
#      Directories specified on the command line are recursively searched
#      for configure.ac files. Install-sh signals an independent unit.
# Modified: Lou Hafer	       SFU      2010-07-08
#      More mods to maintain flexibility but be a bit less aggressive about
#      forcing installation of autotools auxilliary scripts. Also add some
#      command line options and restore ability to specify individual
#      directories on the command line.

# run_autotools takes care of running the autotools (automake, autoconf,
# and helpers) and also makes a few arrangements for when configure and
# libtool execute at configuration, build, and installation.

# Run_autotools can be given a set of directories on the command line; if none
# are specified, it assumes the current directory (`,').  Subdirectories are
# searched for configure.ac files unless suppressed with the -nr option.
# Autotools will consider a directory for processing if any AC_COIN_ macro is
# present in the configure.ac file. Should it be necessary to fool this script
# into processing a file that otherwise contains no COIN macros, just add a
# line with AC_COIN_.  The resulting list is winnowed to remove directories
# specified in COIN_SKIP_PROJECTS.

# Each directory processed gets a temporary link to BuildTools, unless a
# BuildTools subdirectory is already present. Mostly this is a convenience, but
# one thing makes it mandatory: Many Makefile.am files in COIN use an include
# directive to pull in BuildTools/Makemain.inc. There's no way I (lh) can see
# to alter the path that's hardcoded in the include directive. Just to make it
# more interesting, COIN projects are generally constructed with the assumption
# that BuildTools will be one or two directories up, so you'll see things like
# `include ../BuildTools/Makemain.inc'. run_autotools doesn't understand this
# hierarchy, so it keeps all those temporary BuildTools links until the very
# end. That way, it works with the old-style COIN organisation where a
# BuildTools directory is pulled in as an external in the top directory of a
# package, and with the new-style independent organisation, where there may be
# only a single copy of BuildTools out there somewhere.

# If any subdirectory queued for processing is found to contain an install-sh
# script, it is treated as an independent unit (i.e., you can run `make
# install' from this directory) and the set of auxilliary scripts is refreshed
# from BuildTools.  You can force installation of install-sh and associated
# scripts with the -i option. It's good to read the autoconf documentation for
# AC_CONFIG_AUX_DIR if this doesn't make sense to you.

# Make sure we bail out if there is an error
set -e

# Define a cleanup function. We'll set a trap below, just before we start to
# do actual work.

cleanupOnErrorExit ()
{ for link in $buildtoolsLinks; do
    echo Trap: removing $link
    rm -f $link
  done
  cd $startDir
}

# Note that vanilla sh doesn't like negative exit values.

# Determine the location of run_autotools.  If there are no '/' chars in
# the command name, we're running in the current directory (almost certainly
# not what's wanted). Otherwise, strip the command name, leaving the prefix.
# Convert the prefix to an absolute path, if needed, and clean it up, removing
# `XXX/..', '/./', '//' sequences.

startDir=`pwd`
if expr "$0" : '.*/.*' >/dev/null 2>&1 ; then
  runautotoolDir=`echo $0 | sed -e 's,\(.*\)/[^/]*,\1,'`
else
  runautotoolDir='.'
fi
if  expr "$runautotoolDir" : '/.*' >/dev/null 2>&1 ; then
  :
else
  runautotoolDir=$startDir/$runautotoolDir
fi
while expr "$runautotoolDir" : '.*/\.\./.*' >/dev/null 2>&1 ; do
  runautotoolDir=`echo $runautotoolDir | sed -e 's,/[^/][^/]*/\.\./,/,'`
done
runautotoolDir=`echo $runautotoolDir | sed -e 's,/\./,/,g' -e 's,//,/,g'`

# Make sure we're using the correct versions of the autotools. Failure to
# satisfy this requirement is a fatal error.

ver_autoconf='2.59'
ver_automake='1.9.6'
ver_libtool='1.5.22'
EGREP='grep -E'

# Check if the correct version of the autotools is used
if test x$AUTOTOOLS_DIR = x; then
  AUTOTOOLS_DIR=$HOME
fi

grep_version=`echo  $ver_autoconf | sed -e 's/\\./\\\\\\./g'`
autoconf --version > confauto.out 2>&1
if $EGREP $grep_version confauto.out >/dev/null 2>&1; then :; else
  echo You are not using the correct version of autoconf
  rm -f confauto.out
  exit 2
fi
rm -f confauto.out
autoconf_dir=`which autoconf | sed -e 's=/autoconf=='`
autoconf_dir=`cd $autoconf_dir; pwd`
if test $autoconf_dir = `cd $AUTOTOOLS_DIR/bin; pwd`; then :; else
  echo autoconf is not picked up from the correct location
  exit 2
fi

grep_version=`echo  $ver_automake | sed -e 's/\\./\\\\\\./g'`
automake --version > confauto.out 2>&1
if $EGREP $grep_version confauto.out >/dev/null 2>&1; then :; else
  echo You are not using the correct version of automake
  rm -f confauto.out
  exit 2
fi
rm -f confauto.out
autoconf_dir=`which automake | sed -e 's=/automake=='`
autoconf_dir=`cd $autoconf_dir; pwd`
if test $autoconf_dir = `cd $AUTOTOOLS_DIR/bin; pwd`; then :; else
  echo automake is not picked up from the correct location
  exit 2
fi

# Failure to find the correct version of libtool isn't fatal here, but
# the user should be warned.

grep_version=`echo  $ver_libtool | sed -e 's/\\./\\\\\\./g'`
ltfile=$AUTOTOOLS_DIR/share/libtool/ltmain.sh
if test -r $ltfile; then :; else
  echo WARNING: Cannot file libtool shell $ltfile
fi
if $EGREP $grep_version $ltfile >/dev/null 2>&1; then :; else
  echo WARNING: You are not using the correct version of libtool
fi

# Set up to process parameters. No parameters is the default.

printHelp=0
doRecurse=1
forceScripts=0
userSpecifiedDirs=0
dirsToProcess=

# Process the parameters. A parameter without an opening `-' is assumed to be
# a spec for a directory to be processed.

while test $# -gt 0 && test $printHelp = 0 ; do
  case "$1" in
    -h* | --h* )
	 printHelp=1
	 ;;
    -nr* | --no-recursion )
	 doRecurse=0
	 ;;
    -i | --independent )
	 forceScripts=1
	 doRecurse=0
	 ;;
    -* ) echo "$0: unrecognised command line switch '"$1"'."
	 printHelp=1
	 ;;
     * ) dirsToProcess="$dirsToProcess $1"
	 userSpecifiedDirs=1
	 ;;
  esac
  shift
done

# Help?

if test $printHelp = 1 ; then
  cat <<EOF
usage: run_autotools [-h] [-nr] [ directory directory ... ]

  -h  | --help           print help message and exit
  -nr | --no-recursion   do not do recursive search for configure.ac files
  -i  | --independent    install scripts necessary for an independent unit

  If no directories are specified, the tree rooted at the current directory
  is searched recursively for directories with configure.ac files containing
  COIN configuration macros (AC_COIN_*) and autotools is run in those
  directories. Directories listed in COIN_SKIP_PROJECTS are skipped.
  If directories are specified on the command line, the search for configure.ac
  files is restricted to the specified directories.

  If directories are specified on the command line *and* --no-recursion is
  given, the specified directories are processed with no checks.

  The --independent option will force installation of install-sh and other
  scripts necessary for a unit that is installed independently. This will
  be forced in *all* directories processed. Most often what is desired is
  to install these scripts in the top-level directory of a unit, so -i
  forces -nr. It's a good idea to explicitly specify the directories you want
  to process.
EOF
  exit
fi

# Did the user give directories on the command line? If not, assume the current
# directory.

if test -z "$dirsToProcess" ; then
  dirsToProcess='.'
fi

# If recursion is permitted, find directories which contain a file
# configure.ac. When all is said and done, each entry in dirs will be of the
# form `./path/to/directory'

candDirs=
if test $doRecurse = 1 ; then
  for dir in $dirsToProcess ; do
    tmp=`find $dir -name configure.ac | sed -e s%/configure.ac%%g`
    case "$candDirs" in
      *"$tmp"* )
	  ;;
      * )
	  candDirs="$candDirs $tmp"
	  ;;
      esac
  done
else
  candDirs=$dirsToProcess
fi

# Did the user specify these directories *and* forbid recursion? In that case,
# use the directories exactly as given. If not, winnow the candidates.
# Process a directory only if the configure.ac file contains at least one
# macro that starts with AC_COIN_, and it's not listed in COIN_SKIP_PROJECTS.

if test $userSpecifiedDirs = 1 && test $doRecurse = 0 ; then
  dirs=$candDirs
else
  dirs=
  for dir in $candDirs; do
    if grep AC_COIN_ $dir/configure.ac >/dev/null 2>&1 ; then
      dirs="$dirs $dir"
    else
      echo "  Skipping foreign configure.ac in $dir."
    fi
  done

# Now compare against the skip entries in COIN_SKIP_PROJECTS. To match the
# entries we just collected, add `./' to the front of each skip entry.

  candDirs=$dirs
  if test x${COIN_SKIP_PROJECTS+set} = xset ; then
    dirs=
    for dir in $COIN_SKIP_PROJECTS ; do
      skip_dirs="$skip_dirs ./$dir"
    done
    for dir in $candDirs ; do
      skip=0
      for skipdir in $skip_dirs ; do
	if test $dir = $skipdir ; then
	  skip=1
	  break
	fi
      done
      if test $skip = 0 ; then
	dirs="$dirs $dir"
      else
	echo "  Skipping $dir listed in COIN_SKIP_PROJECTS."
      fi
    done
  fi
fi

# Set a trap so that we'll clean up any links on exit, for whatever reason.
# Note that this executes on normal exit, too, so don't do anything rash.

topLink=
subLink=
trap 'exit_status=$?
  cleanupOnErrorExit
  exit $exit_status' 0

# And now the main event. Process each directory.

echo "Running autotools in $dirs"

autotoolsFiles="config.guess config.sub depcomp install-sh ltmain.sh missing"
m4Files="$AUTOTOOLS_DIR/share/aclocal/libtool.m4"
buildtoolsLinks=

for dir in $dirs; do
  if test -r $dir/configure.ac; then
    cd $dir
    echo "Processing $dir ..."

# Do we need a BuildTools subdirectory here? The criteria is that install-sh
# already exists, or Makefile.am (which may include Makemain.inc), or we're
# forcing installation of the configure scripts.  Assuming we need BuildTools,
# what BuildTools should we use? If a BuildTools is already present, that's
# it.  Otherwise, assume that runautotooldDir is BuildTools. Allow that the
# user may have linked to a BuildTools.

    needScripts=0
    if test -f install-sh || test $forceScripts = 1 ; then
      needScripts=1
    fi
    if test -f Makefile.am || test $needScripts = 1 ; then
      if test -d BuildTools || test -L BuildTools ; then
	createLink=0
	toolsDir=`pwd`/BuildTools
      else
	createLink=1
	toolsDir=$runautotoolDir
      fi
      echo "  BuildTools directory: $toolsDir"

# Test to be sure that run_autotools is coming from the BuildTools directory.

      if test $createLink = 0 && test "$toolsDir" != "$runautotoolDir" ; then
	echo "WARNING: using run_autotools from $runautotoolDir"
	echo "         but BuildTools is $toolsDir."
	echo "         Consider carefully if this is what you wanted to do."
      fi

# coin.m4 should live in the same directory; failure is fatal.

      if test ! -r $toolsDir/coin.m4 ; then
	echo "Cannot find Coin autotools macro file $toolsDir/coin.m4."
	echo "It should be in the BuildTools directory."
	exit 1
      fi

# Install a link, if needed.

      if test $createLink = 1 ; then
	ln -s $toolsDir BuildTools
	buildtoolsLinks="$buildtoolsLinks `pwd`/BuildTools"
	echo "  creating temporary link for ./BuildTools -> $toolsDir"
      fi

# And refresh the autotools scripts, if needed.

      if test $needScripts = 1 ; then
	echo "  refreshing autotools scripts in this directory."
	for file in $autotoolsFiles ; do
	  cp BuildTools/$file .
	done
      fi

    fi

# Get on with running the autotools.

    echo "  creating acinclude.m4 in $dir"
    cat $m4Files $toolsDir/coin.m4 > acinclude.m4
    echo "  running aclocal in $dir"
    if test -d m4; then
      aclocal -I m4 || exit 1
    else
      aclocal || exit 1
    fi
    if grep AC_CONFIG_HEADER configure.ac >/dev/null 2>&1; then
      echo "  running autoheader in $dir"
      autoheader || exit 1
    fi
    echo "  running automake in $dir"
    automake || exit 1
    echo "  running autoconf in $dir"
    autoconf || exit 1
    cd $startDir
  else
    # Serious confusion! Should not reach here.
    echo "*** No configure.ac file in $dir - SKIPPING! ***"
  fi
done

# Remove the links. Yeah, the trap will do this, but it never hurts to clean
# up properly.

if test -n "$buildtoolsLinks" ; then
  echo "Removing temporary links to BuildTools."
  for link in $buildtoolsLinks ; do
    # echo "  removing temporary link for BuildTools: $link"
    rm $link
  done
  buildtoolsLinks=
fi

exit