#! /bin/bash
# script to deduce ICEDUST_HOME and ICEDUST_PROJECT variables

usage () {
cat <<EOF
git icedust-home [-d|--debug] [ICEDUST_HOME] [ICEDUST_PROJECT]"
Deduce the ICEDUST_HOME and ICEDUST_PROJECT variables from the supplied arguments or the directory layout"

Options:"
  -h           This help message"
  -d, --debug  Enable debug output"
EOF
exit $1
}


DebugStream=/dev/null
while [ "$#" != 0 ]; do
  case "$1" in
    -d | --debug )
      shift; set -x; DebugStream=/dev/stderr ;;
    -h) usage 0 ;;
    -*)
      echo Unknown option $1 ; exit 1 ;;
    *)
    break;
    ;;
  esac
done

IcedustHome="$1";shift
IcedustProject="$1";shift
Error=""


if [ -z "$IcedustHome" ];then 
    LocalGitTopLevel="`git rev-parse --show-toplevel 2> "$DebugStream" || true`"
    if [ -n "$LocalGitTopLevel" ] ;then
       if git remote -v 2>&1 |tee $DebugStream |grep 'ICEDUST_packages\.git' &> "$DebugStream" ; then
               IcedustHome="`dirname "$LocalGitTopLevel"`"
               IcedustProject="`basename "$IcedustHome"`"
               IcedustHome="`dirname "$IcedustHome"`"
       elif git remote -v 2>&1 |tee $DebugStream |grep 'ICEDUST_externals_.*\.git' &> "$DebugStream" ; then
               IcedustHome="`dirname "$LocalGitTopLevel"`"
               IcedustHome="`dirname "$IcedustHome"`"
               IcedustProject="`basename "$IcedustHome"`"
               IcedustHome="`dirname "$IcedustHome"`"
       elif git remote -v 2>&1 |tee $DebugStream |grep 'ICEDUST_repository\.git' &> "$DebugStream" ; then
               #IcedustProject="`basename "$LocalGitTopLevel"`"
               IcedustHome="`dirname "$LocalGitTopLevel"`"
       else
          Error="ICEDUST_HOME not set, ICEDUST_PROJECT not set and the current git repository doesn't look setup for ICEDUST.  Need more information..."
       fi
    elif [ -d packages ] && [ -d cmt ]; then
            IcedustProject="`basename "$(pwd)"`"
            IcedustHome="`dirname "$(pwd)"`"
    elif [ -d CMT ] && [ -d cmake ] && [ -d documentation ]; then
            IcedustHome="`pwd`"
            #IcedustProject="`basename "$(pwd)"`"
    else
       Error="ICEDUST_HOME not set, ICEDUST_PROJECT not set and not in a git version controlled directory.  Need more information..."
    fi
fi
if [ -z "$Error" ] && [ -n "$IcedustHome" ];then
  if [ -z "$IcedustProject" ];then # Don't have ICEDUST_PROJECT
    if pwd | grep "$IcedustHome"  &>$DebugStream ; then
       IcedustProject="`pwd | sed -e 's!^.*'"$IcedustHome"'/\?\([^/]*\).*!\1!'`"
    else
       Error="ICEDUST_PROJECT not set, ICEDUST_HOME set, but not in a working directory that contains the ICEDUST_HOME path."
    fi
  elif pwd | grep "$IcedustHome"  &>$DebugStream ; then
       IcedustHome="`pwd | sed -e 's!^\(.*'"$IcedustHome"'\)/.*!\1!'`"
  fi
fi

# did we have an error?
if [ -n "$Error" ];then
    echo "icedust-home: Error: $Error"
    exit 1
fi

[ -z "$IcedustHome" ] && IcedustHome="$ICEDUST_HOME"
[ -z "$IcedustProject" ] && IcedustProject="$ICEDUST_PROJECT"

# output for subsequent programs to use
echo -n "ICEDUST_HOME=$IcedustHome;"
echo "ICEDUST_PROJECT=$IcedustProject;"