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refactor createoutputfiles with promise functions
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@acestronautical
acestronautical committed Feb 22, 2024
1 parent c8947e6 commit c45fa31
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Showing 2 changed files with 104 additions and 76 deletions.
167 changes: 94 additions & 73 deletions src/book.js
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Original file line number Diff line number Diff line change
Expand Up @@ -298,7 +298,7 @@ export class Book {
async createoutputfiles(isPreview) {
const previewFrame = document.getElementById('pdf');
previewFrame.style.display = 'none';
let resultPDF = null;
let previewPdf = null;

// create a directory named after the input pdf and fill it with
// the signatures
Expand All @@ -316,102 +316,123 @@ export class Book {
this.format == 'standardsig' ||
this.format == 'customsig'
) {
const generateAggregate = this.print_file != 'signatures';
const generateSignatures = this.print_file != 'aggregated';
let aggregatePdf0, aggregatePdf1;
if (generateAggregate) {
aggregatePdf0 = await PDFDocument.create();
aggregatePdf1 = this.duplex ? null : await PDFDocument.create();
// Only generate the first signature for preview
const pagesArr = isPreview ? this.rearrangedpages.slice(0, 1) : this.rearrangedpages;
const signatures = [{}];
const makeSignatures = async () => {
await Promise.all(
pagesArr.map(async (pages, i) => {
console.log(pages);
signatures[i] = { name: `${this.filename}_signature${i}` };
[signatures[i].front, signatures[i].back] = await this.createSignatures({
pageIndexDetails: pages,
});
})
);
};
await makeSignatures();

// always duplex for preview
if (this.duplex || isPreview) {
const duplexSignatures = async () => {
await Promise.all(
signatures.map(async (sig, i) => {
signatures[i].duplex = await interleavePages(sig.front, sig.back);
signatures[i].back = signatures[i].front = null;
})
);
};
await duplexSignatures();
previewPdf = signatures[0].duplex;
}
const forLoop = async () => {
for (let i = 0; i < this.rearrangedpages.length; i++) {
const signature = this.rearrangedpages[i];
console.log(signature);
const sigName = `${this.filename}_signature${i}`;
const [sigFront, sigBack] = await this.createSignatures({
pageIndexDetails: signature,
});

if (this.duplex) {
// collate
const sig = await interleavePages(sigFront, sigBack);

if (generateSignatures) {
await sig.save().then((pdfBytes) => {
this.zip.file(`signatures/${sigName}_duplex`, pdfBytes);
if (this.print_file != 'aggregated' && !isPreview) {
const saveSignatures = async () => {
await Promise.all(
signatures.map(async (sig) => {
await sig.front?.save().then((pdfBytes) => {
this.zip.file(`signatures/${sig.name}_side1`, pdfBytes);
});
}

if (generateAggregate) {
const copiedPages = await aggregatePdf0.copyPages(sig, sig.getPageIndices());
copiedPages.forEach((page) => aggregatePdf0.addPage(page));
}
} else {
if (generateSignatures) {
await sigFront.save().then((pdfBytes) => {
this.zip.file(`signatures/${sigName}_side1`, pdfBytes);
await sig.back?.save().then((pdfBytes) => {
this.zip.file(`signatures/${sig.name}_side2`, pdfBytes);
});
await sigBack.save().then((pdfBytes) => {
this.zip.file(`signatures/${sigName}_side2`, pdfBytes);
await sig.duplex?.save().then((pdfBytes) => {
this.zip.file(`signatures/${sig.name}_duplex`, pdfBytes);
});
}
})
);
};
await saveSignatures();
}

if (generateAggregate) {
const copiedPagesFront = await aggregatePdf0.copyPages(
sigFront,
sigFront.getPageIndices()
if (this.print_file != 'signatures' && !isPreview) {
const saveAggregate = async () => {
const aggregate = {
front: !this.duplex ? await PDFDocument.create() : null,
back: !this.duplex ? await PDFDocument.create() : null,
duplex: this.duplex ? await PDFDocument.create() : null,
};
for (const sig of signatures) {
// Adding pages to aggregate PDFs has to be done in order, not with promises
if (aggregate.front) {
const copiedPages = await aggregate.front.copyPages(
sig.front,
sig.front.getPageIndices()
);
copiedPagesFront.forEach((page) => aggregatePdf0.addPage(page));

const copiedPagesBack = await aggregatePdf1.copyPages(
sigBack,
sigBack.getPageIndices()
copiedPages.forEach((page) => aggregate.front.addPage(page));
}
if (aggregate.back) {
const copiedPages = await aggregate.back.copyPages(
sig.back,
sig.back.getPageIndices()
);
copiedPages.forEach((page) => aggregate.back.addPage(page));
}
if (aggregate.duplex) {
const copiedPages = await aggregate.duplex.copyPages(
sig.duplex,
sig.duplex.getPageIndices()
);
copiedPagesBack.forEach((page) => aggregatePdf1.addPage(page));
copiedPages.forEach((page) => aggregate.duplex.addPage(page));
}
}
}
};
await forLoop();

if (aggregatePdf1 != null) {
await aggregatePdf1.save().then((pdfBytes) => {
if (!isPreview) this.zip.file(`${this.filename}_typeset_side2.pdf`, pdfBytes);
});
}
if (aggregatePdf0 != null) {
await aggregatePdf0.save().then((pdfBytes) => {
if (!isPreview)
this.zip.file(
this.duplex ? `${this.filename}_typeset.pdf` : `${this.filename}_typeset_side1.pdf`,
pdfBytes
);
});
aggregate.front?.save().then((pdfBytes) => {
this.zip.file(`${this.filename}_typeset_side1.pdf`, pdfBytes);
});
aggregate.back?.save().then((pdfBytes) => {
this.zip.file(`${this.filename}_typeset_side2.pdf`, pdfBytes);
});
aggregate.duplex?.save().then((pdfBytes) => {
this.zip.file(`${this.filename}_typeset.pdf`, pdfBytes);
});
};
await saveAggregate();
}

var rotationMetaInfo =
(this.paper_rotation_90 ? 'paper_rotated' : '') +
(this.source_rotation == 'none' ? '' : `_${this.source_rotation}`);
this.filename = `${origFileName}${rotationMetaInfo}`;
} else if (this.format == 'a9_3_3_4') {
resultPDF = await this.buildSheets(this.filename, this.book.a9_3_3_4_builder());
previewPdf = await this.buildSheets(this.filename, this.book.a9_3_3_4_builder());
} else if (this.format == 'a10_6_10s') {
resultPDF = await this.buildSheets(this.filename, this.book.a10_6_10s_builder());
previewPdf = await this.buildSheets(this.filename, this.book.a10_6_10s_builder());
} else if (this.format == 'a_4_8s') {
resultPDF = await this.buildSheets(this.filename, this.book.a_4_8s_builder());
previewPdf = await this.buildSheets(this.filename, this.book.a_4_8s_builder());
} else if (this.format == 'a_3_6s') {
resultPDF = await this.buildSheets(this.filename, this.book.a_3_6s_builder());
previewPdf = await this.buildSheets(this.filename, this.book.a_3_6s_builder());
} else if (this.format == 'A7_2_16s') {
resultPDF = await this.buildSheets(this.filename, this.book.a7_2_16s_builder());
previewPdf = await this.buildSheets(this.filename, this.book.a7_2_16s_builder());
} else if (this.format == '1_3rd') {
resultPDF = await this.buildSheets(this.filename, this.book.page_1_3rd_builder());
previewPdf = await this.buildSheets(this.filename, this.book.page_1_3rd_builder());
} else if (this.format == '8_zine') {
resultPDF = await this.buildSheets(this.filename, this.book.page_8_zine_builder());
previewPdf = await this.buildSheets(this.filename, this.book.page_8_zine_builder());
}
console.log('Attempting to generate preview for ', resultPDF);
console.log('Attempting to generate preview for ', previewPdf);

if (resultPDF != null) {
const pdfDataUri = await resultPDF.saveAsBase64({ dataUri: true });
const viewerPrefs = resultPDF.catalog.getOrCreateViewerPreferences();
if (previewPdf != null) {
const pdfDataUri = await previewPdf.saveAsBase64({ dataUri: true });
const viewerPrefs = previewPdf.catalog.getOrCreateViewerPreferences();
viewerPrefs.setHideToolbar(false);
viewerPrefs.setHideMenubar(false);
viewerPrefs.setHideWindowUI(false);
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13 changes: 10 additions & 3 deletions src/utils/pdf.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -11,14 +11,21 @@ import { PDFDocument } from 'pdf-lib';
export async function interleavePages(pdfA, pdfB) {
const mergedPdf = await PDFDocument.create();
const pageCount = Math.max(pdfA.getPageCount(), pdfB.getPageCount());
const promises = [];

for (let i = 0; i < pageCount; i++) {
const pageA = pdfA.getPage(i);
if (pageA) mergedPdf.addPage((await mergedPdf.copyPages(pdfA, [i]))[0]);
const pageAPromise = pdfA.getPage(i);
const pageBPromise = pdfB.getPage(i);

promises.push(pageAPromise, pageBPromise);

const pageB = pdfB.getPage(i);
const [pageA, pageB] = await Promise.all([pageAPromise, pageBPromise]);

if (pageA) mergedPdf.addPage((await mergedPdf.copyPages(pdfA, [i]))[0]);
if (pageB) mergedPdf.addPage((await mergedPdf.copyPages(pdfB, [i]))[0]);
}

await Promise.all(promises); // Wait for all page retrieval promises to resolve
return mergedPdf;
}

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