[PATCH] hush.c - export -n flag support

[Denys Vlasenko]

Hi Mike,

Regret to point at a mistake here.

/* ${var=[word]} or ${var:=[word]} */
if (isdigit(var[0]) || var[0] == '#') {
        /* mimic bash message */
        die_if_script("$%s: cannot assign in this way", var);
        val = NULL;
} else {
        char *new_var = xasprintf("%s=%s", var, val);
        set_local_var(new_var, -1, 0);

Here -1 as a possible set_local_var's export flag was added.
It was also documented:

 * flg_export:
 *  0: do not export
 *  1: export
 * -1: if NAME is set, leave export status alone
 *     if NAME is not set, do not export
 * flg_read_only is set only when we handle -R var=val
 */

But set_local_var function does not follow the documentation,
though. -1 works exactly as 0.

I am replacing -1 with 0 in the fragment above, since 0 means "don't
touch export flag", and am adding -1 with the meaning "unset export
if it's set". export -n will use that. Fixing docs (comments) too.
--
vda