#!/usr/bin/env zsh

function err(){ print -- $@ >&2; exit 1 }

# scriptdir is the directory of the current executable
if [[ ${0[0]} = '/' ]]; then
    scriptdir="${0:h}"
else
    scriptdir="$PWD/${0:h}"
fi

# the tmp directory where compilation occurs with a lot of temporary files
tmpdir=/tmp/mp
[[ ! -d $tmpdir ]] && mkdir $tmpdir

# the list of mp files without argument all file in the current tree
typeset -a fics
if (($#<1)); then
    fics=( $scriptdir/*.mp(N) )
else
    for f in $@; fics=( $fics $scriptdir/$f )
fi

(( ${#fics} == 0 )) && err "No .mp files into $scriptdir"

(( ${#fics} == 1 )) && [[ ${fics[1]} = "$scriptdir/graph.mp" ]] && \
        err "Only graph.mp files indo $scriptdir"

\cp -f $fics $tmpdir
cd $tmpdir
for fpfic in $fics; do
    fic=${fpfic:t}
    tmp=${fic:r}-tmp.mp
    eps=${fic:r}-tmp.1
    png=${fic:r}.png
    old=${fic:r}.old
    [[ $fic = "graph.mp" ]] && continue
    {
        echo -n >&2 "MPOST [$fic]"
        cat $scriptdir/graph.mp
        echo 'beginfig(1)'
        echo '  drawoptions (withcolor base01);'
        cat $fic
        echo 'endfig;'
        echo 'bye;'
    } | sed 's/base00/baseZeroZero/g' \
      | sed 's/base01/baseZeroOne/g' \
      | sed 's/base02/baseZeroTwo/g' \
      | sed 's/base03/baseZeroThree/g' \
      | sed 's/base0/baseZero/g' \
      | sed 's/base1/baseOne/g' \
      | sed 's/base2/baseTwo/g' \
      | sed 's/base3/baseThree/g' \
      | sed 's/red/s_red/g' \
      | sed 's/blue/s_blue/g' \
      | sed 's/green/s_green/g' > $tmp
    [[ -e $old ]] && diff $tmp $old >/dev/null && { echo " identical"; continue }

	dpi=$(grep '% DPI' $tmp | awk '{print $3}')
	[[ $dpi = "" ]] && dpi=600

	print
	print "[DPI]: $dpi"

    # addshadow="'(' +clone -background black -shadow 90x4+0+1 ')' +swap -background none -layers merge +repage"
    addshadow=""
    reducesize=" -colors 254 -quality 75"
    cmd="convert -colorspace rgb -density $((4*dpi)) $eps -resize 25% $addshadow $reducesize $png"

    print -- "[$PWD]: mpost $tmp && convert -density $dpi $tmp.1 $png"
    mpost --tex=latex $tmp && \
        eval $cmd && \
        \cp -f $png $scriptdir && \
        \cp -f $tmp $old && \
        echo "updated"
done