// Gift tags from a list: type the names, get one tag each. Every name is
// measured and sized to fill its tag, short or long. Use it for place
// cards, keyrings or labels by changing the shape and the second line.

/* [Tags] */
// Names, separated by commas
names = "Mila, Theo, Grandma, Oliver, Nora";
// Small text under each name, leave empty for none
line2 = "with love"; // 24
// Tag shape
shape = "tag"; // [tag:Luggage tag, round:Round]
// Width of a luggage tag, or diameter of a round one
size = 72; // [40:2:120]

/* [Material] */
// Sheet thickness
$thickness = 3; // [2:0.5:6]
// Beam width
$kerf = 0.15; // [0:0.01:0.3]

/* [Hidden] */
$material = "plywood";
$fn = 64;
hole = 5;

function trim(s) =
  len(s) == 0 ? s :
  s[0] == " " ? trim(slice(s, 1)) :
  s[len(s) - 1] == " " ? trim(slice(s, 0, len(s) - 1)) : s;

list = [for (n = split(names, ",")) if (trim(n) != "") trim(n)];

// Text area [x, y, width, height] and hole position for each shape
tag_h = size * 0.44;
area = shape == "tag"
  ? [tag_h * 0.62, 0, size - tag_h * 0.62 - 4, tag_h]
  : [-size * 0.38, -size * 0.3, size * 0.76, size * 0.52];
hole_at = shape == "tag" ? [tag_h * 0.3, tag_h / 2] : [0, size / 2 - 8];

module blank() {
  if (shape == "tag") offset(r = 2) offset(delta = -2) polygon([
    [0, tag_h * 0.28], [tag_h * 0.28, 0], [size, 0], [size, tag_h],
    [tag_h * 0.28, tag_h], [0, tag_h * 0.72]
  ]);
  else circle(d = size);
}

// The largest text size at which the name still fits the area
function fit(name, width, height) = min(height, width / text_width(name, 1));

module tag(name) {
  small = line2 == "" ? 0 : area[3] * 0.16;
  big = fit(name, area[2] * 0.86, area[3] * (line2 == "" ? 0.5 : 0.4));
  cx = area[0] + area[2] / 2;
  cy = area[1] + area[3] / 2 + (line2 == "" ? 0 : small * 0.75);
  difference() {
    blank();
    translate(hole_at) circle(d = hole);
  }
  engrave() {
    translate([cx, cy]) text(name, size = big, halign = "center", valign = "center");
    if (line2 != "") translate([cx, cy - big * 0.6 - small * 1.1])
      text(line2, size = small, halign = "center", valign = "center");
  }
  score() {
    translate(hole_at) circle(d = hole + 4);
    if (shape == "tag") translate([area[0], 3]) rect([area[2], tag_h - 6], r = 2);
    else circle(d = size - 4);
  }
}

for (name = list) part(name) tag(name);