#!/bin/sh
#
# gitsch2ppm - Generate PPM files for KiCad schematics in git
#
# Written 2010 by Werner Almesberger
# Copyright 2010 Werner Almesberger
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#


RES=1280x850
LINEWIDTH=120


ps2ppm()
{
    X=`echo $RES | sed 's/x.*//'`
    Y=`echo $RES | sed 's/.*x//'`
    IRES=${Y}x$X
    res=`expr 72 \* $X / 800`

    ( cat <<EOF
%!PS-Adobe-3.0
/setlinewidth { $LINEWIDTH 2 copy lt { exch } if pop setlinewidth } bind def
/rectfill { rectstroke } bind def
EOF
    sed 1d <"$1"; ) |
	gs -sDEVICE=ppmraw -sOutputFile=- -g$IRES -r$res \
	  -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -q - |
	  pnmflip -r270 |
	  cat >`dirname "$1"`/`basename "$1" .ps`.ppm
}


usage()
{
    cat <<EOF 1>&2
usage: $0 [options] top-dir top-schem [commit] outdir

  -c         use cached Postscript files (from previous run, with -k)
  -k         keep checked-out tree (for immediate reuse with -c)
  -r XxY     image resolution (default: $RES)
  -S         sanitize the KiCad profile
  -w points  Postscript line width (default: $LINEWIDTH)
EOF
    exit 1
}


cache=false
keep=false
sanitize=true
while true; do
    case "$1" in
    -c)	cache=true
	shift;;
    -k)	keep=true
	shift;;
    -r)	[ -z "$2" ] && usage
	RES="$2"
	shift 2;;
    -S) sanitize=`PATH="$PATH":\`dirname "$0"\` which sanitize-profile`
	[ "$sanitize" = "${sanitize#/}" ] && sanitize=`pwd`/"$sanitize"
	shift;;
    -w)	[ -z "$2" ] && usage
	LINEWIDTH="$2"
	shift 2;;
    -*)
	usage;;
    *)
	break;;
    esac
done

[ ! -z "$3" -a -z "$5" ] || usage
dir="$1"
schem="$2"
sdir=`dirname "$schem"`
if [ -z "$4" ]; then
    commit=HEAD
    outdir="$3"
else
    commit="$3"
    outdir="$4"
fi

[ "$dir" != "${dir#/}" ] || dir=`pwd`/$dir

[ "$commit" != HEAD -o -f "$dir/$schem" ] || usage
[ -d "$dir/.git" ] || usage

tmp="$dir/../_gitsch2ppm"
sch="$tmp/$sdir"

if ! $cache; then
    rm -rf "$tmp"
    rm -rf "$outdir"

    git clone -s -n "$dir/.git" "$tmp" || exit
    ( cd "$tmp" && git checkout -q "$commit"; ) || exit

    if [ ! -f "$tmp/$schem" ]; then
        echo "$schem not found (checked out into $tmp)" 1>&2
        exit 1
    fi

    (
	cd "$sch" || exit
	rm -f *.ps *.ppm
	$sanitize "$tmp"/`dirname "$schem"`/`basename "$schem" .sch`.pro ||
	  exit
	eeschema --plot "$tmp/$schem"
    ) || exit
fi

for n in "$sch"/*.ps; do
    ps2ppm "$n"
done

mkdir -p "$outdir"

mv "$sch"/*.ppm "$outdir"

$keep || rm -rf "$tmp"