#!/usr/bin/nawk -f
#Q&D to print off a set of ADDITION flash cards
# print pdf: double sided, Landscape & Flip on Short Side

BEGIN{
  test=0;
  a="\x27";q="\x22";
  Dir="/tmp/FLASHCARDS";
  s="mkdir "Dir;
  if(test==1)print s;else system(s);
  for (i=1;i<=10;i++)
    for(j=1;j<=10;j++){
      Q[++cnt]=" "i" + "j" = ";
      A[cnt]=i+j;
    }#end for i j
  fmtQ="convert -size 230x142 xc:white -gravity center -bordercolor gray -border 1 -font Courier-Bold -pointsize 36 -draw \x22text 0,0 \x27 %s \x27\x22 %s/question_%02d.jpg";
  fmtA="convert -size 232x144 xc:white -gravity center  -font Courier-Bold -pointsize 36 -draw \x22text 0,0 \x27 %s \x27\x22 +flop %s/answer_%02d.jpg";
#cnt=31;
  i=cnt;while (i>=0){
    n=0;
    for (j=1;j<=3;j++){
      for (k=1;k<=4;k++){
        i--;
        s=sprintf(fmtQ,Q[i],Dir,++n);
        if(test==1)print s;else system(s);
        s=sprintf(fmtA,A[i],Dir,n);
        if(test==1)print s;else system(s);
      }#end for k
    }#end for j

    for (j=1;j<=3;j++){
      for (k=1;k<=4;k++){
        s="montage /tmp/FLASHCARDS/question_??.jpg -mode Concatenate -tile 3x4 /tmp/FLASHCARDS/question.jpg";
        if(test==1)print s;else system(s);
        s="montage /tmp/FLASHCARDS/answer_??.jpg -mode Concatenate -tile 3x4 /tmp/FLASHCARDS/answer0.jpg";
        if(test==1)print s;else system(s);
#note: page is "flopped" mirror imaged for back side of question page
        s= "convert /tmp/FLASHCARDS/answer0.jpg +flop /tmp/FLASHCARDS/answer.jpg";
        if(test==1)print s;else system(s);
      }#end for k
    }#end for j
    s=sprintf("convert %s/question.jpg %s/answer.jpg -resize 3300x550 %s/flashcardAdd_%02d.pdf",Dir,Dir,Dir,++p);
    if(test==1)print s;else system(s);
  }#end while i=cnt
}#end BEGIN