There is a limitation of libreadline where no context/userdata
can be passed to completion functions. Thi affects iwctl since
the entity value isn't known to completion functions.
Workarounds such as getting the default device are employed but
its not a great solution.
Instead hack around this limitation by parsing the prompt to
extract the entity (second arg). Then use a generic match function
given to readline which can call the actual match function and
include the entity.
The existing color code escape sequences required the user to set the
color, write the string, then unset with COLOR_OFF. Instead the macros
can be made to take the string itself and automatically terminate the
color with COLOR_OFF. This makes for much more concise strings.
Switch the command pattern to match the common command scheme
where the entity name (network name) follows the command family name:
From
known-network forget <network name>
To
known-network <network name> forget
In addition, it extracts the network match by name logic into its
own function for the further reusability. In the case of ambiguity
between the network objects with the same SSID but different security
types the logic asks to specify the security type in addition
to the network name as follows:
known-network <network name.security> forget
