#!/bin/sh
# $Id: srclist-update,v 1.2 2002-09-25 14:18:57 karl Exp $
# 
# Check for files being up to date, according to the list on stdin.
# 
# Source $mydir/srclistvars.sh first, if it exists, where
# $mydir=`dirname $0`.

if test -n "$1"; then
  cd "$1" || exit 1
fi

verbose=false
#chicken="echo (would)"

srctmp=${TMPDIR-/tmp}/srclist.src
dsttmp=${TMPDIR-/tmp}/srclist.dst

mydir=`dirname $0`
test -r $mydir/srclistvars.sh && . $mydir/srclistvars.sh

cat | while read src dst; do
  test -z "$dst" && continue  # skip lines without second element
  echo "$src $dst" | sed 's/#.*$//' | egrep '^\s*$' >/dev/null \
  && continue  # skip whitespace and comment-only lines
  
  src=`eval echo $src`
  if test ! -r $src; then
    echo "$0: cannot read $src" >&2
    continue
  fi
  
  # If given src/foo.c dst, copy to dst/foo.c.
  dst=`eval echo $dst`
  test -d $dst && dst=$dst/`basename $src`
  
  # $ Id: lines will differ.
  fgrep -v '$'"Id:" $src >$srctmp
  test -r $dst && fgrep -v '$'"Id:" $dst >$dsttmp

  if test ! -e $dst; then
    echo "## $src $dst  # new"
    $chicken cp -p $src $dst
  elif cmp -s $srctmp $dsttmp; then
    $verbose && echo "## $src $dst  # unchanged"
  else
    echo "## $src $dst  # changes"
    diff -c2 $dst $src
  fi
done

rm -f $srctmp $dsttmp