autoenv.fish and example .env.fish file

.env.fish

set -x DJANGO_SECRET_KEY "foo_123123123"
set -x AWS_ACCESS_KEY_ID "bar_456456456"

autoenv.fish

if not set -q AUTOENVFISH_FILE
    set -g AUTOENVFISH_FILE ".env.fish"
end

# Automatic env
function __vfsupport_autoenv --on-variable PWD
    if status --is-command-substitution # doesn't work with 'or', inexplicably
        return
    end

    # find an autoenv file, checking up the directory tree until we find 
    # such a file (or nothing)
    set -l envfishdir $PWD
    while test ! "$envfishdir" = "" -a ! -f "$envfishdir/$AUTOENVFISH_FILE"
        # this strips the last path component from the path.
        set envfishdir (echo "$envfishdir" | sed 's|/[^/]*$||')
    end

    if [ -f "$envfishdir/$AUTOENVFISH_FILE" ]
        . "$envfishdir/$AUTOENVFISH_FILE"
    end

end

#automatically activate if started in a directory with an .env.fish in it
__vfsupport_autoenv