# Set up ESP OS shell environment

# 1st parameter is the platform type (eg. [shallow], 1km)
# 2nd parameter is unit name (eg. gigi, neo, etc.) = ESPname
#   The default for the unit name is derived from the system's hostname
# 3rd parameter is the ESPhome directory [~/esp2] = ESPhome
# 4th parameter is ESPpath
#   defaults to [$ESPhome/mission:.]
# 5th parameter is ESPconfigPath
#   defaults to
#[$ESPhome/type/$type/$unitName:$ESPhome/type/$type:$ESPhome/type:$ESPhome/admin]

type=${1-shallow}
unitName=$2
home=${3-$HOME/esp2}  #default if no home specified
[ "$unitName" ] || {  #no unit name specified, derive default from hostname
  host=`hostname`
  unitName=${host#ESP}  #strip leading ESP from hostname
}
export ESPname=$unitName
# path for mission and admin scripts
export ESPpath="${4-"$home/mission:."}"

configPath=$5
[ "$configPath" ] || {
  unitDir="$home/type/$type/$unitName"
# configPath='.:'
  [ -d "$unitDir" ] && configPath="${configPath}${unitDir}:"
  configPath="${configPath}$home/type/$type:$home/type:$home/admin"
}
export ESPconfigPath=$configPath

# remove all fields $1 from list delimited by $2 starting with $3
# send the filtered version of $2 to stdout
remove ()
{
  [ "$3" ] && {
    toDelete=$1
    oldIFS="$IFS"
    IFS="$2"
    shift 2
    set $@
    unset separator
    for field; do
      if [ "$field" != "$toDelete" ]; then
        echo -n "$separator$field"
        separator="$IFS"
      fi
    done
    IFS="$oldIFS"
  }
}


[ "$ESPhome" ] && {
  PATH=`remove "$ESPhome/bin" : "$PATH"`
  RUBYLIB=`remove "$ESPhome/lib" : "$RUBYLIB"`      #system library
  RUBYLIB=`remove "$ESPhome/utils" : "$RUBYLIB"`    #utility scripts
}
unset remove

export ESPhome=$home
export PATH="$PATH:$ESPhome/bin"

# path for ESP libraries
export RUBYLIB="${RUBYLIB:+$RUBYLIB:}$ESPhome/lib:$ESPhome/utils"

# default operational mode -- scripts defining them reside in $ESPhome/mode
: ${ESPmode:=real}
: ${ESPlog:=/var/log/$USER}
export ESPmode ESPlog