What is `OPT_NONEG` doing?

[CMCDragonkai]

And what are the flags for argparse_init? The example only shows 0.

[cofyc]

hi,

OPT_BOOLEAN and OPT_BIT types support negation, you can use no- prefix to negate the value, for example:

OPT_BIT(0, "read", &perms, "read perm", NULL, PERM_READ, OPT_NONEG),
OPT_BIT(0, "write", &perms, "write perm", NULL, PERM_WRITE),
OPT_BIT(0, "exec", &perms, "exec perm", NULL, PERM_EXEC),

--write turns on write permission, --no-exec means no exec permission.

But, if you don't want this feature, you can use OPT_NONEG flag to turn off this feature. In the example above, --no-write and --no-exec is valid, but --no-read is invalid.

[CMCDragonkai]

Can those flags be put into argparse_init(&argparse, options, usage, 0);. See the 0 at the end?

Also the 0 for OPT_BIT, does that mean there's no short option for read? So it's equivalent to NULL?

[cofyc]

@CMCDragonkai

NO, OPT_NONEG is per OPT flag.