@mfgames-writing/weasyprint-format/lib/weasyprint.js

A formatter plugin for mfgames-writing-format that creates PDF files.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.loadWeasyPrintFormatter = void 0;
const child = require("child_process");
const semver = require("semver");
const WeasyPrintFormatter_1 = require("./WeasyPrintFormatter");
/*
 * This module is working around a number of limitations in WeasyPrint (0.40).
 *
 *   1. We can't inject the page number so all documents start at 1.
 *
 * To get around this, we generate each section with a reset page number as a
 * separate PDF and then combine the results suing pdftk.
 */
function loadWeasyPrintFormatter(args) {
    if (!checkWeasyPrint(args)) {
        return null;
    }
    if (!checkPdfTk(args)) {
        return null;
    }
    return new WeasyPrintFormatter_1.WeasyPrintFormatter();
}
exports.loadWeasyPrintFormatter = loadWeasyPrintFormatter;
/**
 * Checks the minimum version of WeasyPrint for processing.
 */
function checkPdfTk(args) {
    // Get the version from WeasyPrint so we can parse it.
    var cmd = child.spawnSync("pdftk", ["--version"], {
        stdio: [0, "pipe", "pipe"],
    });
    if (!cmd.stdout) {
        args.logger.error("Cannot find the `pdftk` executable");
        return false;
    }
    // Old versions of WeasyPrint only used a two-part version which means
    // too old for us.
    var cmdOutput = cmd.stdout.toString().replace(/[\r\n]/g, " ");
    var cmdVersion = cmdOutput.replace(/^.*pdftk (\d+\.\d+).*$/, "$1");
    args.logger.debug("Using PdfTK: " + cmdVersion);
    return !!cmdVersion;
}
/**
 * Checks the minimum version of WeasyPrint for processing.
 */
function checkWeasyPrint(args) {
    // Get the version from WeasyPrint so we can parse it.
    var cmd = child.spawnSync("weasyprint", ["--version"], {
        stdio: [0, "pipe", "pipe"],
    });
    if (!cmd.stderr) {
        args.logger.error("Cannot find the `weasyprint` executable");
        return false;
    }
    // The most recent version of WeasyPrint (50), writes to stdout (as opposed
    // to stderr) and only has a single number. WeasyPrint also includes
    // patches to their output, so this should handle all three dotted versions.
    var cmdOutput = cmd.stdout.toString().trim();
    var cmdVersion = cmdOutput
        .replace(/^.*version ([\d.]+)$/, "$1")
        .replace(/^(\d+)$/, "$1.0")
        .replace(/^(\d+\.\d+)$/, "$1.0");
    var version = semver.valid(cmdVersion);
    args.logger.debug("Using WeasyPrint: " + cmdVersion);
    if (!version) {
        args.logger.error("Cannot parse version from `weasyprint` (" +
            cmdVersion +
            "): " +
            cmdOutput);
        return false;
    }
    // Make sure we have our minimum version.
    if (semver.lt(version, "0.42.0")) {
        args.logger.error("mfgames-writing-weasyprint requires WeasyPrint 0.42.0 or later" +
            ", found " +
            cmdVersion);
        return false;
    }
    // We are good.
    return true;
}
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