#!/bin/sh

# The first parameter is the target, the file to be built.
# All remaining parameters are dependencies (file names).
if [ $# -lt 1 ] ; then
  echo "  $0: Incorrect number ($#) of parameters passed: $*"
  exit 1
fi
OUTFILE=$1
shift 1
INFILES="$@"

MAKEINFO="makeinfo --no-split --force"
TROFF="groff -t -Tps -U"
SEDME="sed -e \"s/^level0 restore/level0 restore flashme 100 72 moveto (Copyright `date '+%m-%d-%y %T'`, FSF, Inc. (all)) show/\" -e \"s/^\/level0 save def/\/level0 save def 30 -48 translate/\""
SEDME2="sed '/%%Page: 10 10/,/0 Cg EP/d'"

function BuildTarget()
{
  local OUTFILE=$1
  local INFILE=""
  local COMMAND=""

  FILEBASE=${OUTFILE%.*}
  case $OUTFILE in
    *\.in | *\.1 | macros | cardfonts | colors | ad.block | setter.outline | \
    gawkinet.texi | rflashlight.eps | api-figure1.fig | api-figure2.fig | api-figure3.fig | \
    general-program.fig | process-flow.fig | statist.eps)
      INFILE=$OUTFILE
      ;;
    *\.texi)
      if [ $FILEBASE = gawk ] ; then
               INFILE=gawktexi.in
      else
               INFILE=$OUTFILE.in
      fi
      COMMAND="awk -f sidebar.awk < $INFILE > $OUTFILE"
      ;;
    *\.dvi)
      INFILE=$FILEBASE.texi
      COMMAND="texi2dvi -q --clean $INFILE"
      ;;
    *\.info)
      INFILE=$FILEBASE.texi
      COMMAND="${MAKEINFO} $INFILE"
      ;;
    *\.ps)
      if [ $FILEBASE = awkcard ] ; then
        INFILE=awkcard.in
        COMMAND="${TROFF} $* | ${SEDME} | cat setter.outline - | ${SEDME2} > awkcard.ps"
      elif [ $FILEBASE = gawk.1 -o $FILEBASE = igawk.1 ] ; then
        INFILE=$FILEBASE
        COMMAND="groff -z -man $INFILE > $OUTFILE"
      else
        INFILE=$FILEBASE.dvi
        COMMAND="dvips -q -o $OUTFILE $INFILE"
      fi
      ;;
    *\.pdf)
      INFILE=$FILEBASE.ps
      COMMAND="ps2pdf -q $INFILE $OUTFILE"
      ;;
    *\.tr)
      INFILE=$FILEBASE.in
      COMMAND="sed 's:SRCDIR:.:' < $INFILE > $OUTFILE"
      ;;
    *\.nc)
      INFILE=$FILEBASE.in
      COMMAND="sed 's:SRCDIR:.:' < $INFILE > $OUTFILE"
      COMMAND="${TROFF} $* | ${SEDME} | cat setter.outline - | ${SEDME2} > $FILEBASE.ps && touch $OUTFILE"
      ;;
    *)
      echo "  unknwon target $OUTFILE"
      exit 1
  esac

  if  [ ! -r "$INFILE" ] ; then
    echo " $0: Cannot read input file $INFILE"
    exit 1
  fi
  
  if [ -f "$OUTFILE" ] ; then
    if [ "$INFILE" -ot "$OUTFILE" ] ; then
      #printf "  Target %15s is up-to-date\n" $OUTFILE
      COMMAND=""
    fi
  fi
  #echo "  Generating $OUTFILE from $INFILE"
  echo $COMMAND | sh -x
  #echo "COMMAND=$COMMAND"
}

# Build all dependencies first, then build the target.
for dep in $INFILES
do
  #echo $OUTFILE depends on $dep
  BuildTarget $dep
done
BuildTarget $OUTFILE