#!/bin/sh
set -e

basedir=/usr/share/vim/vim72/doc

# If we're upgrading from a version that had "vim-runtime Replaces vim-tiny"
# and diversions haven't been setup, remove help.txt and tags to ensure
# diversions get setup properly.
#
# OTOH, if we already have diversions setup, we may have a situation where
# vim-tiny isn't installed but help.txt and tags have been diverted.  In that
# case, remove the diverted files as they don't belong.
check_diversion() {
  if dpkg --compare-versions "$1" ge "1:7.1-056+1" \
     && dpkg --compare-versions "$1" lt "1:7.1.314-1"; then
    rm -f /usr/share/vim/vim71/doc/tags
    rm -f /usr/share/vim/vim71/doc/help.txt
  elif dpkg --compare-versions "$1" ge "1:7.1.314-1"; then
    inst="$(dpkg-query -W -f='${Status}\n' vim-tiny | awk '{print $1}')"
    if [ "$inst" != "install" ]; then
      # 7.2a versioning was handled oddly
      if echo "$1" | grep -q '~'; then
        version="72a"
      else
        version="${1#?:}"
        version="$(echo ${version%.*-*} | sed 's/\.//g')"
      fi
      rm -f /usr/share/vim/vim$version/doc/tags.vim-tiny
      rm -f /usr/share/vim/vim$version/doc/help.txt.vim-tiny
    fi
  fi
}

add_diversion() {
  dpkg-divert --package vim-runtime --add --rename \
    --divert "$1.vim-tiny" "$1"
}

# Also run during upgrade to fix the botched handling of diversions in postrm
# in the 1:71.314-{1,2} uploads.  This would need to be run during an upgrade
# to a new major upstream version as well to handle removing the diversions in
# previous versioned directories.
if [ "$1" = "install" ] || [ "$1" = "upgrade" ]; then
  if [ "$1" = "upgrade" ]; then
    check_diversion "$2"
  fi
  add_diversion $basedir/help.txt
  add_diversion $basedir/tags
fi



exit 0