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File name : texlive-base
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#!/bin/sh -e
# created 2010 by Frank Küster frank@debian.org
# The code may be freely copied, distributed and/or modified

# The plan: 
# 1. Analyze the current situation and compare with the libpaper setting:
#    a) Get the settings for dvips, xdvi, pdftex and dvipdfmx from 
#       their respective conffiles - use texconfig-sys for that
#    b) Get the libpaper setting
#    c) Check whether all 4 binaries have the same current setting.
# 2. Depending on the comparison, act differently
#    a) if Yes, check whether current setting and libpaper setting are the same
#        i. if Yes, we are done
#        ii. if no, call "texconfig-sys paper $libpaper-default" and check the return value
#            A. If the return value is 1, give a debconf warning that nothing has been changed
#            In any case we are done
#    b) if No, 
#       i.  print a debconf multiselect window that lists the current settings and 
#           lets the admin select which binaries should get the new, changed configuration
#       ii. next, call "texconfig-sys $binary paper $libpaper-default" for each selected binary,
#           and check the return value
#            A. If the return value is 1, give a debconf warning that nothing has been changed
# Done.

# If texlive-base is removed, just  do nothing. 
test -x /usr/bin/tl-paper || exit 0

. /usr/share/debconf/confmodule
db_version 2.0


#####################################
#
# code from tex-common postinst
#
####################################
#
dhit_package_configured()
{
    stat=$(dpkg-query -W -f='${Status}' $1 2>/dev/null || true)
    case "$stat" in
        "install ok installed")
            return 0
            ;;
        *)
            return 1
            ;;
    esac
}

dhit_base_bin_configured ()
{
    we_are_ready=0
    if ! dhit_package_configured texlive-binaries ; then
        return 1
    fi
    dhit_package_configured texlive-base
}

dhit_update_lsr_files ()
{
    tempfile=$(mktemp -p /tmp mktexlsr.XXXXXXXX)
    printf "Running mktexlsr. This may take some time... "
    if mktexlsr $* > $tempfile 2>&1 ; then
        rm -f $tempfile
        echo "done."
    else
        exec >&2
        echo
        echo "mktexlsr $* failed. Output has been stored in"
        echo "$tempfile"
        echo "Please include this file if you report a bug."
        echo
        exit 1
    fi
}
dhit_build_format ()
{
    tempfile=$(mktemp -p /tmp fmtutil.XXXXXXXX)
    printf "Building format(s) $*.\n\tThis may take some time... "
    if fmtutil-sys "$@" > $tempfile 2>&1 ; then
        rm -f $tempfile
        echo "done."
    else
        exec >&2
        echo
        echo "fmtutil-sys failed. Output has been stored in"
        echo "$tempfile"
        echo "Please include this file if you report a bug."
        echo
        exit 1
    fi
}
#####################################
#
# end code from tex-common postinst
#
####################################


dvips=$(tl-paper get dvips)
xdvi=$(tl-paper get xdvi)
pdftex=$(tl-paper get pdftex)
dvipdfmx=$(tl-paper get dvipdfmx)

LibpaperPaper=$(paperconf)

FourPapersAllSame=false

if [ "$dvips" = "$xdvi" ] && \
   [ "$dvips" = "$pdftex" ] && \
   [ "$dvips" = "$dvipdfmx" ]; then
  FourPapersAllSame=true
fi

if [ $FourPapersAllSame = true ]; then
  if [ "$dvips" = $LibpaperPaper ]; then
    exit 0
  else
    if tl-paper set all $LibpaperPaper; then
      if dhit_base_bin_configured ; then
        dhit_update_lsr_files /var/lib/texmf
        dhit_build_format --refresh
      fi
      # finished now
      exit 0
    else
      # texconfig-sys didn't understand the paper name
      db_subst texlive-base/texconfig_ignorant libpaperPaper $LibpaperPaper
      db_subst texlive-base/texconfig_ignorant binary "all programs"
      db_subst texlive-base/texconfig_ignorant binary_commandline ""
      # the priority will be treated as critical anyway for all error templates.
      db_input critical texlive-base/texconfig_ignorant || true
      db_go || true
    fi
  fi
else
#    b) if No, 
#       i.  print a debconf multiselect window that lists the current settings and 
#           lets the admin select which binaries should get the new, changed configuration
#       ii. next, call "texconfig-sys $binary paper $libpaper-default" for each selected binary,
#           and check the return value
#            A. If the return value is 1, give a debconf warning that nothing has been changed
# Done.
  # the four Papers are not all the same. Ask the user.  
  db_subst texlive-base/binary_chooser libpaperPaper $LibpaperPaper
  db_fset texlive-base/binary_chooser seen false
  db_input high texlive-base/binary_chooser || true
  db_go || true

  db_get texlive-base/binary_chooser
  ListOfBinariesToUseLibpaper="$RET"

  # now get rid of the commas by assigning to the positional parameters
  OLD_IFS="$IFS"
  IFS=', '
  set $ListOfBinariesToUseLibpaper
  # IFS needs to be restored before talking to debconf
  IFS=$OLD_IFS

  for binary in "$@"; do
    if tl-paper list $binary | grep "^$LibpaperPaper\$"; then
      # use this instead once set has a proper return code
      # if tl-paper set $binary $LibpaperPaper; then 

      # all is well
      tl-paper set $binary $LibpaperPaper
      if dhit_base_bin_configured; then
        dhit_update_lsr_files /var/lib/texmf
        # only rebuild when pdftex has changed, all others are
        # run time files
        if [ "$binary" = "pdftex" ] ; then
          dhit_build_format --refresh
        fi
      fi
      :
    else
      db_subst texlive-base/texconfig_ignorant binary "$binary"
      db_subst texlive-base/texconfig_ignorant binary_commandline "$binary"
      db_subst texlive-base/texconfig_ignorant libpaperPaper "$LibpaperPaper"
      db_input high texlive-base/texconfig_ignorant || true

      db_go || true
    fi
  done

fi


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