imagemagick hangs 😞

[reggi]

I have a command here:

convert -background white -font "/System/Library/Fonts/Supplemental/Comic Sans MS.ttf" -pointsize 30 label:meow  png:- | identify -format "%w" -
77

For some reason this just hangs:

#!/usr/bin/env -S deno run --allow-all
import $ from "@david/dax"; // "dax-sh" in Node

async function getImageWidth(opts: {
  font: string;
  fontSize: number;
  text: string;
  trim?: boolean;
}) {
  const { font, fontSize, text, trim } = opts;
  const shouldTrim = trim ? "-trim" : "";
  return await $`convert -background white -font ${font} -pointsize ${fontSize} label:${text} ${shouldTrim} png:- | identify -format "%w" -`.text();
}

console.log(
  await getImageWidth({
    font: "/System/Library/Fonts/Supplemental/Comic Sans MS.ttf",
    fontSize: 30,
    text: "meow",
  })
);

[NfNitLoop]

I expect this line might not be operating as you expect:

  const shouldTrim = trim ? "-trim" : "";

Later, you insert ${shouldTrim} into the command.

Coming from shells like Bash, you're probably expecting that empty string to disappear and have no effect. But dax automatically quotes all arguments, so you're still ending up with a "" or '' in the arguments getting passed to convert.

Try enabling verbose command logging like this to verify:

$.setPrintCommand(true)