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#!/bin/sh
if [ -z ${XDG_DATA_HOME+x} ]; then
ENV_DIR="$HOME/.local/share/ves/envs"
else
ENV_DIR="$XDG_DATA_HOME/ves/envs"
fi
check_name() {
if ! [ -f "$ENV_DIR/$1" ]; then
printf "ERROR: Environment [%s] does not exist.\n" $1 > /dev/stderr
exit 1
fi
if ! echo $1 | grep "^[[:alpha:][:digit:]_-]*$" > /dev/null; then
printf "ERROR: Environment [%s] is invalid. Name must contain only letters, -, and _\n" $1 > /dev/stderr
exit 1
fi
}
ENV=""
while :; do
case $1 in
--env=*)
ENV=$( echo $1 | cut -d "=" -f 2 )
shift
break
;;
--)
shift
break
;;
-?*)
printf "ERROR: Invalid option [%s]\n" $1 > /dev/stderr
exit 2
;;
*)
break
esac
shift
done
if ! [ -z $ENV ]; then
check_name $ENV
elif ! [ -z $VES_ENV_NM ]; then
# this check_name shouldn't be necessary, but I suppose someone
# could always manually reassign the variable, so we'd better
# check it.
check_name $VES_ENV_NM
ENV=$VES_ENV_NM
else
printf "ERROR: No valid environment active or specified\n" > /dev/stderr
exit 2
fi
if [ $# -lt 2 ]; then
printf "ERROR: Insufficient arguments provided.\n"
exit 2
fi
# Ah, bash would have made this so much nicer... alas
# if [ -z ${!1+x} ]; then ...
if eval [ -z \${$1+x} ]; then
printf "ERROR: Specified variable [%s] does not exist in environment.\n" $1 > /dev/stderr
printf "\tYou can create it with\n\t ves export %s\n " $1 > /dev/stderr
exit 2
fi
# If we get down here, all is good. We can go ahead and prepend
# :$2 to the variable contained in $1. Again, no easy indirection,
# so we must use eval.
if eval [ -z \${$1} ]; then
export $1=$2
else
eval export "$1"="$2":\$"$1"
fi
# Perhaps we could use . to run this script from the main caller
# which could be set up as a shell function?
# That approach seems to work to modify the parent shell. Just
# gotta set up the main guy as a function.
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