search/filter: update completion

Update the completion system by implementing the OptionsProvider and
OptionComleter interfaces. The command flags that expect arguments can
be completed now: -x,-X with the available flags, -t,-f,-c with the
address book (after more then 3 characters), -d with a selected
suggestion for useful dates.

Examples:

:filter -<Tab>
lists the available option flags

:filter -t org<Tab>
fills the completion menu with address from your address-book-cmd
matching "org" (same with -f and -c)

:filter -x <Tab>
lists the available flags (same with -X)

:filter -d <Tab>
lists a few convenient date terms

Signed-off-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>

0 files changed, 0 insertions, 0 deletions