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// A re-implementation of "mutool merge" in JavaScript.
function copyPage(dstDoc, srcDoc, pageNumber, dstFromSrc) {
var srcPage, dstPage
srcPage = srcDoc.findPage(pageNumber)
dstPage = dstDoc.newDictionary()
dstPage.Type = dstDoc.newName("Page")
if (srcPage.MediaBox) dstPage.MediaBox = dstFromSrc.graftObject(srcPage.MediaBox)
if (srcPage.Rotate) dstPage.Rotate = dstFromSrc.graftObject(srcPage.Rotate)
if (srcPage.Resources) dstPage.Resources = dstFromSrc.graftObject(srcPage.Resources)
if (srcPage.Contents) dstPage.Contents = dstFromSrc.graftObject(srcPage.Contents)
dstDoc.insertPage(-1, dstDoc.addObject(dstPage))
}
function copyAllPages(dstDoc, srcDoc) {
var dstFromSrc = dstDoc.newGraftMap()
var k, n = srcDoc.countPages()
for (k = 0; k < n; ++k)
copyPage(dstDoc, srcDoc, k, dstFromSrc)
}
function pdfmerge() {
var srcDoc, dstDoc, i
dstDoc = new PDFDocument()
for (i = 1; i < scriptArgs.length; ++i) {
srcDoc = new PDFDocument(scriptArgs[i])
copyAllPages(dstDoc, srcDoc)
}
dstDoc.save(scriptArgs[0], "compress")
}
if (scriptArgs.length < 2)
print("usage: mutool run pdf-merge.js output.pdf input1.pdf input2.pdf ...")
else
pdfmerge()
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