#! /bin/sh
##
## Rdiff -- diff 'without R version'

## Copyright (C) 2000-2008 The R Core Development Team.
## This is free software; see the GNU General Public License version 2
## or later for copying conditions.  There is NO warranty.

## Usage:
##   R CMD Rdiff from-file to-file exitstatus
## where from-file equal to '-' means STDIN

ffile=${1}
tfile=${2}
exitstatus=${3}

## These are set in Renviron if run from R CMD
## 'grep -E' is POSIX, but not AT&T Unix, so not supported
## by the default grep on Solarix, for example
EGREP=${EGREP-egrep}
SED=${SED-sed}

## sed scripts to get rid of the startup message
scriptold='/^R : Copyright /,/quit R.$/{d;}'
scriptnew='/^R version /,/quit R.$/{d;}'

## turn UTF-8 directional single quotes into ASCII quote
s1="s/‘/'/g"
s2="s/’/'/g"

## egrep pattern to get rid of some more
## <= 2.2.x was pattern='(^Number of.*:|^Time |^Loading required package.*'
pattern='(^Time |^Loading required package.*|^Package [A-Za-z][A-Za-z0-9]+ loaded'
case "${ffile}" in
  *primitive-funs*)
    pattern=${pattern}'|^\[1\] [19][0-9][0-9])'
    ;;
  *)
    pattern=${pattern}'|^<(environment|promise|pointer): )'
    ;;
esac

if test ${ffile} = '-' ; then
  ffile=''
  bfile=''
else
  if test -f ${ffile} ; then
      bfile=`basename "${ffile}"`
  else
      echo "no valid file ${ffile}"
      exit 1
  fi
fi

tmpfile=${TMPDIR-/tmp}/${bfile}-d.${$}

${SED} -e "${scriptold}" -e "${scriptnew}" -e "${s1}" -e "${s2}" ${ffile} | ${EGREP} -v "${pattern}" > ${tmpfile}
## some packages ship .Rout.save with CRLF endings
(tr -d '\r' <  ${tfile} | ${SED} -e "${scriptold}" -e "${scriptnew}" -e "${s1}" -e "${s2}" | \
  ${EGREP} -v "${pattern}" | \
  diff -bw ${tmpfile} - ) && exitstatus=0

rm -f ${tmpfile}

exit ${exitstatus}
