envedit

# Do not make this executable!
# use a . .command to invoke perhaps with an alias like pathed

if [ "$0" == "$BASH_SOURCE"  -o  -z "$1" ]
then
 echo Error. You must source this script
 echo Usage: . envedit VAR
 echo   or   . envedit alias
 echo E.g.: . $0 PATH

else



if [  "$1" = "alias" ]
then
  alias enved=". $BASH_SOURCE"
  echo Alias created
else

# Uncomment out next line to override defaults
#ENVEDIT_EDITOR="emacs -nw"
ENVEDIT_FN=$(mktemp)    # temporary file
echo ${!1} >"$ENVEDIT_FN"   # set up path
ENVEDIT_OLD=$(ls -li $ENVEDIT_FN)  # remember last time
# execute the editor as best we ecan
command ${ENVEDIT_EDITOR:-${VISUAL:-${EDITOR:-vi}}} "$ENVEDIT_FN"
# examine new date
ENVEDIT_NEW=$(ls -li $ENVEDIT_FN )
# if file changed and is not empty
if [ "$ENVEDIT_OLD" = "$ENVEDIT_NEW" -o ! -s "$ENVEDIT_FN" ]
then
  echo "No changes"
else
    ENVEDIT_CMD=$1=\"$(cat "$ENVEDIT_FN")\"   # set new var
    eval "$ENVEDIT_CMD"

fi
fi
fi