preinst is in vim-runtime 2:7.4.1689-3ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | #!/bin/sh
set -e
vimcur="vim74"
basedir=/usr/share/vim/$vimcur/doc
add_diversion() {
  dpkg-divert --package vim-runtime --add --rename \
    --divert "$1.vim-tiny" "$1"
}
major_upgrade() {
  oldver="${1#?:}"
  oldver="vim$(echo ${oldver%.*-*} | sed 's/\.//g')"
  [ "$oldver" != "$vimcur" ]
}
# Add diversions for any non-upgrade operation or when upgrading across major
# upstream versions.
if [ "$1" != "upgrade" ] || major_upgrade $2; then
  add_diversion $basedir/help.txt
  add_diversion $basedir/tags
fi
exit 0
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