set_fcn() and remove_fcn() are strongly related. They should accept
arguments in the same format, hence the parsing of the arguments should
be done at one place.
In fact, previously the parsing was separate, leading to ugly
inconsistencies:
$ nmcli connection modify "$PROFILE" +vpn.data x=y
$ nmcli connection modify "$PROFILE" -vpn.data x=y
Error: failed to remove a value from vpn.data: invalid option 'x=y'.
or
$ nmcli connection modify "$PROFILE" +ipv4.addresses 192.168.1.5/24,192.168.2.5/24
$ nmcli connection modify "$PROFILE" -ipv4.addresses 192.168.1.5/24,192.168.2.5/24
Error: failed to remove a value from ipv4.addresses: invalid prefix '24,192.168.2.5/24'; <1-32> allowed.
Let set_fcn() handle set-default, set-all, add, and subtract.
Previously, set_fcn() could only append values. Now, pass on the modifier
so that it may append, set all, or reset the default.
These operations are strongly related and should be handled by the same
set_fcn() function.
It's usually not necessary, because _nm_utils_unescape_spaces()
gets called after nm_utils_strsplit_set(), which already removes
the non-escaped spaces.
Still, for completeness, this should be here. Also, because with
this the function is useful for individual options (not delimiter
separate list values), to support automatically dropping leading or
trailing whitespace, but also support escaping them.
A property-info can only have one property-typ-data. That means,
all functions (get_fcn(), set_fcn()) need to either take not
property-typ-data, or they must all accept the same.
That made it hard to mix _get_fcn_nmc_with_default() with setters
that do require a certain property-typ-data. Instead, move the
is_default_func() to the general portion, and let _get_fcn_gobject()
handle it.
The setting's verify() function already checks that the s390 options
are not empty and no longer than 200. Asserting for that is a major
annoyance, because callers need to reimplement that check.
Instead of having a trivial macro that defines a function, define the
function directly.
Having such a macro would make sense if DEFINE_REMOVER_OPTION() would do
the right thing and we would reuse the (preferred) implementation.
That's not the case, because these remove_fcn() implementations don't
mirror the way how set_fcn() splits and sets options. They are
inconsistent (wrong), and should will later get merged with set_fcn().
Instead of using a macro to define the individual set/remove functions,
add a new property type _pt_multilist.
This way, we have more the concept of a property having a type, instead
of a property having a set of handlers how to implement something.
Also, this is only the first step. There are several similar properties
that also can be implemented as the same type.
The property implementation must itself decide how to reset a value.
We must not rely on properties being plain GObject properties.
Let set_fcn() accept %NULL value to indicate resetting the default.
