drawio.js

import { callbackify } from "util";
import exec from "./exec";
import fs from "fs";
import logger from "gulplog";
import { mkTempFile } from "./tempdir";
import { obj } from "through2";
import PluginError from "plugin-error";
import { withBinary } from "./optional";

const PLUGIN_NAME = "drawio";

const drawio = withBinary(
  "DRAWIO_BINARY",
  "drawio",
  (DRAWIO_BINARY) =>
    function drawio() {
      return obj(
        callbackify(async function (input) {
          try {
            const output = await mkTempFile(input);
            output.extname = ".svg";

            const args = [
              "--export",
              "--format",
              "svg",
              "--width",
              "1024",
              "--output",
              output.path,
              input.path,
            ];

            await exec(PLUGIN_NAME, DRAWIO_BINARY, args);

            logger.info(
              "%s: %s -> %s",
              PLUGIN_NAME,
              input.relative,
              output.relative
            );

            output.contents = fs.createReadStream(output.path, {
              encoding: "UTF-8",
            });
            this.push(output);
          } catch (error) {
            throw new PluginError(PLUGIN_NAME, error, { showStack: true });
          }
        })
      );
    }
);

export default drawio;