sage-arch-env

#!/usr/bin/env bash

########################################################################
# SAGE64
########################################################################

if [ -z "$SAGE64" ]; then
    # If SAGE64 is unset, set it to "yes" if sage-64.txt exists
    # and to "no" otherwise.
    if [ -f "$SAGE_LOCAL"/etc/sage-64.txt ]; then
        export SAGE64=yes
    else
        export SAGE64=no
    fi
elif [ "$SAGE64" = "yes" ]; then
    # If SAGE64 is set to "yes", create sage-64.txt
    mkdir -p "$SAGE_LOCAL/etc"
    touch "$SAGE_LOCAL"/etc/sage-64.txt
elif [ "$SAGE64" = "no" ]; then
    # If SAGE64 is set to "no", remove sage-64.txt
    rm -f "$SAGE_LOCAL"/etc/sage-64.txt
else
    echo >&2 "The environment variable SAGE64 (=$SAGE64) must be either unset, yes or no."
    return 1
fi