#!/bin/sh
## R_HOME/bin/massage-Examples
## Given a list of files of the form .../.../<name>.R, produce one large
## file, i.e. write to stdout, `cat'ting the files together with
## 1) Putting a HEADER in front
## 2) Wrapping every file in order to be more order independent
## 3) appending a FOOTER ...

## Should work WHEREVER this is called from :
(cd `dirname $0`/..
  R_HOME=`pwd`; export R_HOME
)
R_HOME=`cd ${R_HOME}; pwd`	# absolute

PKG=${1}; shift; FILES="${@}"

## 1) ---- Header ----
(cat <<_EOF_
attach(NULL, name = "CheckExEnv")
assign(".CheckExEnv", pos.to.env(2), pos = length(search()))
assign("ptime", proc.time(), env = .CheckExEnv)
postscript("PKG-Examples.ps")
assign("par.postscript", par(no.readonly = TRUE), env = .CheckExEnv)
options(contrasts = c(unordered = "contr.treatment", ordered = "contr.poly"))
_EOF_
) | sed "s/PKG/${PKG}/"
if [ "${PKG}" != "base" ]; then echo "library('${PKG}')" ; fi

## 2) ---- edit a few of these files:
for file in ${FILES}
do
  bf=`basename $file .R`
  if test -n "`grep '_ Examples _' $file`"; then
    echo "rm(list = ls(all = TRUE)); .Random.seed <- c(0,rep(7654,3))"
  fi

  cat ${file}

  if test -n "`grep 'par(' ${file}`"; then
    ## if there were 'par(..)' calls, now reset them:
    echo 'par(get("par.postscript", env = .CheckExEnv))'
  fi
  if test -n "`grep 'options(contrasts' ${file}`"; then
    ## if contrasts were set, now reset them:
    echo 'options(contrasts = c(unordered = "contr.treatment", ordered = "contr.poly"))'
  fi
done

## 3) ---- Footer ----
cat <<_EOF_
cat("Time elapsed: ", proc.time() - get("ptime", env = .CheckExEnv),"\n")
dev.off(); quit('no')
_EOF_