POSTIN

/bin/sh

update-alternatives --install /bin/vi vi /bin/vim-minimal 10 \
    --slave /bin/view view /bin/vim-minimal \
    --slave /bin/ex ex /bin/vim-minimal \
    --slave /bin/rvi rvi /bin/vim-minimal \
    --slave /bin/rview rview /bin/vim-minimal
update-alternatives --install /bin/vim vim /bin/vim-minimal 10 \
    --slave /bin/rvim rvim /bin/vim-minimal

POSTUN

/bin/sh

[ $1 = 0 ] || exit 0
update-alternatives --remove vi  /bin/vim-minimal
update-alternatives --remove vim /bin/vim-minimal

Triggers

vim-minimal < 7.3

/bin/sh

update-alternatives --remove uvi /bin/vim-minimal
for i in view ex rvi rview rvim; do
    update-alternatives --remove $i /bin/$i || :
done