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Add PDF manipulation functionality with options to duplicate pages and combine pages 2-up

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Francisco Pessano
2025-03-13 16:26:12 -03:00
commit f9dec6d1e0
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node_modules

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{
"name": "pdf-pages-reducer",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"build": "tsc",
"start": "node dist/index.js",
"dev": "ts-node src/index.ts"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
"@types/inquirer-fuzzy-path": "^2.3.9",
"@types/node": "^22.13.10",
"ts-node": "^10.9.2",
"typescript": "^5.8.2"
},
"dependencies": {
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"inquirer": "^12.4.3",
"inquirer-fuzzy-path": "^2.3.0",
"pdf-lib": "^1.17.1"
}
}

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351
src/index.ts Normal file
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import inquirer from "inquirer";
import { PDFDocument, degrees } from "pdf-lib";
import * as fs from "fs";
import * as path from "path";
// Extend the orientation type to include "stacked"
type OrientationType = "horizontal" | "vertical" | "stacked";
interface Answers {
operation: string;
pdfPath: string;
copies: number;
orientation: OrientationType;
specifyPaperSize: boolean;
selectedSize: [number, number];
}
// -------------- Existing duplicate function --------------
async function duplicatePages(
inputPath: string,
copies: number
): Promise<Uint8Array> {
const pdfBytes = fs.readFileSync(inputPath);
const pdfDoc = await PDFDocument.load(pdfBytes);
const pageCount = pdfDoc.getPageCount();
for (let i = 0; i < pageCount; i++) {
// For each page, insert (copies-1) additional copies after it
for (let j = 0; j < copies - 1; j++) {
const [copiedPage] = await pdfDoc.copyPages(pdfDoc, [i]);
pdfDoc.insertPage(i + 1 + j, copiedPage);
}
}
return pdfDoc.save();
}
// -------------- Updated 2-up function --------------
async function combinePages2In1(
inputPath: string,
orientation: OrientationType,
paperSize?: [number, number]
): Promise<Uint8Array> {
// 1) Load the input PDF
const pdfBytes = fs.readFileSync(inputPath);
const originalPdf = await PDFDocument.load(pdfBytes);
// 2) Create a new PDFDocument for the 2-up output
const newPdf = await PDFDocument.create();
// 3) Decide final page size (portrait)
let finalWidth: number;
let finalHeight: number;
if (paperSize) {
[finalWidth, finalHeight] = paperSize; // e.g. [595.28, 841.89] for A4
} else {
// Default to A4 if none chosen
finalWidth = 595.28;
finalHeight = 841.89;
}
// 4) For each page in the original PDF, add a new 2-up page
const pageCount = originalPdf.getPageCount();
for (let i = 0; i < pageCount; i++) {
// Add a blank page in the new PDF
const newPage = newPdf.addPage([finalWidth, finalHeight]);
// Copy the same page twice
const [origPage1] = await newPdf.copyPages(originalPdf, [i]);
const [origPage2] = await newPdf.copyPages(originalPdf, [i]);
// Embed them
const embedded1 = await newPdf.embedPage(origPage1);
const embedded2 = await newPdf.embedPage(origPage2);
// Original size
const { width: w, height: h } = origPage1.getSize();
if (orientation === "vertical") {
// ---------------------------------------------------
// "VERTICAL" = side-by-side (left/right)
// ---------------------------------------------------
//
// ┌─────────┬─────────┐
// │ Page1 │ Page2 │
// └─────────┴─────────┘
//
// Each half is finalWidth/2 wide, finalHeight tall.
// Use "contain" scaling so each page fits entirely.
const slotWidth = finalWidth / 2;
const slotHeight = finalHeight;
const scale = Math.min(slotWidth / w, slotHeight / h);
const scaledW = w * scale;
const scaledH = h * scale;
// Left slot offsets
const offsetX1 = (slotWidth - scaledW) / 2;
const offsetY1 = (slotHeight - scaledH) / 2;
newPage.drawPage(embedded1, {
x: offsetX1,
y: offsetY1,
xScale: scale,
yScale: scale,
});
// Right slot offsets
const offsetX2 = slotWidth + (slotWidth - scaledW) / 2;
const offsetY2 = offsetY1;
newPage.drawPage(embedded2, {
x: offsetX2,
y: offsetY2,
xScale: scale,
yScale: scale,
});
} else if (orientation === "horizontal") {
// ---------------------------------------------------
// "HORIZONTAL" = top & bottom WITH rotation
// ---------------------------------------------------
//
// ┌─────────┐ (top half)
// │ Page1 │ rotated +90
// ├─────────┤
// │ Page2 │ rotated +90
// └─────────┘ (bottom half)
//
// Each half is finalWidth wide, finalHeight/2 tall.
// We rotate each original page so it appears landscape.
const slotWidth = finalWidth;
const slotHeight = finalHeight / 2;
// After a +90 rotation, the bounding box is effectively (h × w).
const scale = Math.min(slotWidth / h, slotHeight / w);
// We'll shift x by + h*scale so the rotated page remains in view
// and center it within the slot.
// Page1 in the TOP half
const offsetX1 = (slotWidth - h * scale) / 2;
const offsetY1 = slotHeight + (slotHeight - w * scale) / 2;
newPage.drawPage(embedded1, {
x: offsetX1 + h * scale,
y: offsetY1,
xScale: scale,
yScale: scale,
rotate: degrees(90),
});
// Page2 in the BOTTOM half
const offsetX2 = (slotWidth - h * scale) / 2;
const offsetY2 = (slotHeight - w * scale) / 2;
newPage.drawPage(embedded2, {
x: offsetX2 + h * scale,
y: offsetY2,
xScale: scale,
yScale: scale,
rotate: degrees(90),
});
} else {
// ---------------------------------------------------
// "STACKED" = top & bottom WITHOUT rotation
// ---------------------------------------------------
//
// ┌─────────┐ (top half)
// │ Page1 │ normal orientation
// ├─────────┤
// │ Page2 │ normal orientation
// └─────────┘ (bottom half)
//
// Each half is finalWidth wide, finalHeight/2 tall.
// We do not rotate. We simply scale to fit.
const slotWidth = finalWidth;
const slotHeight = finalHeight / 2;
const scale = Math.min(slotWidth / w, slotHeight / h);
const scaledW = w * scale;
const scaledH = h * scale;
// Place Page1 in the top half
// top half's y-range is [slotHeight, finalHeight]
const offsetX1 = (slotWidth - scaledW) / 2;
const offsetY1 = slotHeight + (slotHeight - scaledH) / 2;
newPage.drawPage(embedded1, {
x: offsetX1,
y: offsetY1,
xScale: scale,
yScale: scale,
});
// Place Page2 in the bottom half
const offsetX2 = (slotWidth - scaledW) / 2;
const offsetY2 = (slotHeight - scaledH) / 2;
newPage.drawPage(embedded2, {
x: offsetX2,
y: offsetY2,
xScale: scale,
yScale: scale,
});
}
}
// 5) Save and return
return newPdf.save();
}
// -------------- Updated main() --------------
async function main() {
try {
// 1) Check if PDF path is provided as a command-line argument
let pdfPath: string | undefined = process.argv[2];
// 2) If not provided, prompt for PDF path
if (!pdfPath) {
const answer = await inquirer.prompt<Pick<Answers, "pdfPath">>({
type: "input",
name: "pdfPath",
message: "Enter the path to your PDF file:",
validate: async (input: string) => {
try {
fs.existsSync(input);
return (
path.extname(input).toLowerCase() === ".pdf" ||
"Please provide a PDF file"
);
} catch {
return "File does not exist";
}
},
});
pdfPath = answer.pdfPath;
} else {
// Validate the provided PDF path
if (
!fs.existsSync(pdfPath) ||
path.extname(pdfPath).toLowerCase() !== ".pdf"
) {
console.error("Invalid PDF path provided as argument.");
return;
}
}
// 3) Ask user what operation to perform
const { operation } = await inquirer.prompt<Pick<Answers, "operation">>({
type: "list",
name: "operation",
message: "What operation would you like to perform?",
choices: ["Duplicate PDF pages", "Combine pages 2 in 1"],
});
// 4) Perform the chosen operation
if (operation === "Duplicate PDF pages") {
// Ask how many copies
const { copies } = await inquirer.prompt<Pick<Answers, "copies">>({
type: "number",
name: "copies",
message: "How many copies of each page do you want?",
validate: (input?: number) =>
(input && input > 0) || "Please enter a number greater than 0",
});
// Output path for duplicated pages
const outputPath = path.join(
path.dirname(pdfPath),
`${path.basename(pdfPath, ".pdf")}_duplicated.pdf`
);
// Duplicate
const pdfBytes = await duplicatePages(pdfPath, copies);
fs.writeFileSync(outputPath, pdfBytes);
console.log(`Success! Output saved to: ${outputPath}`);
} else {
// "Combine pages 2 in 1"
// 4.1) Ask orientation
// - "vertical" => side by side
// - "horizontal" => top/bottom with rotation
// - "stacked" => top/bottom no rotation
const { orientation } = await inquirer.prompt<
Pick<Answers, "orientation">
>({
type: "list",
name: "orientation",
message: "Select arrangement (affects content placement):",
choices: [
{ name: "Vertical (side-by-side)", value: "vertical" },
{ name: "Horizontal (top/bottom, rotated)", value: "horizontal" },
{ name: "Stacked (top/bottom, no rotation)", value: "stacked" },
],
});
// 4.2) Ask if user wants to specify a paper size
const { specifyPaperSize } = await inquirer.prompt<
Pick<Answers, "specifyPaperSize">
>({
type: "confirm",
name: "specifyPaperSize",
message: "Would you like to choose a common paper size for the output?",
default: false,
});
let chosenPaperSize: [number, number] | undefined = undefined;
if (specifyPaperSize) {
const { selectedSize } = await inquirer.prompt<
Pick<Answers, "selectedSize">
>({
type: "list",
name: "selectedSize",
message: "Select a paper size (output will be portrait):",
choices: [
{ name: "A4 (210 × 297 mm)", value: [595.28, 841.89] },
{ name: "Letter (8.5 × 11 in)", value: [612, 792] },
{ name: "Legal (8.5 × 14 in)", value: [612, 1008] },
{ name: "A3 (297 × 420 mm)", value: [841.89, 1190.55] },
{ name: "Tabloid (11 × 17 in)", value: [792, 1224] },
],
});
chosenPaperSize = selectedSize;
}
// 4.3) Output path
const outputPath = path.join(
path.dirname(pdfPath),
`${path.basename(pdfPath, ".pdf")}_2up.pdf`
);
// 4.4) Generate the 2-up PDF
const pdfBytes = await combinePages2In1(
pdfPath,
orientation,
chosenPaperSize
);
fs.writeFileSync(outputPath, pdfBytes);
console.log(`Success! 2-up PDF saved to: ${outputPath}`);
}
} catch (error) {
console.error("An error occurred:", error);
}
}
main();

113
tsconfig.json Normal file
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@@ -0,0 +1,113 @@
{
"compilerOptions": {
/* Visit https://aka.ms/tsconfig to read more about this file */
/* Projects */
// "incremental": true, /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
// "composite": true, /* Enable constraints that allow a TypeScript project to be used with project references. */
// "tsBuildInfoFile": "./.tsbuildinfo", /* Specify the path to .tsbuildinfo incremental compilation file. */
// "disableSourceOfProjectReferenceRedirect": true, /* Disable preferring source files instead of declaration files when referencing composite projects. */
// "disableSolutionSearching": true, /* Opt a project out of multi-project reference checking when editing. */
// "disableReferencedProjectLoad": true, /* Reduce the number of projects loaded automatically by TypeScript. */
/* Language and Environment */
"target": "es2016", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
// "lib": [], /* Specify a set of bundled library declaration files that describe the target runtime environment. */
// "jsx": "preserve", /* Specify what JSX code is generated. */
// "libReplacement": true, /* Enable lib replacement. */
// "experimentalDecorators": true, /* Enable experimental support for legacy experimental decorators. */
// "emitDecoratorMetadata": true, /* Emit design-type metadata for decorated declarations in source files. */
// "jsxFactory": "", /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */
// "jsxFragmentFactory": "", /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
// "jsxImportSource": "", /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */
// "reactNamespace": "", /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */
// "noLib": true, /* Disable including any library files, including the default lib.d.ts. */
// "useDefineForClassFields": true, /* Emit ECMAScript-standard-compliant class fields. */
// "moduleDetection": "auto", /* Control what method is used to detect module-format JS files. */
/* Modules */
"module": "commonjs", /* Specify what module code is generated. */
// "rootDir": "./", /* Specify the root folder within your source files. */
// "moduleResolution": "node10", /* Specify how TypeScript looks up a file from a given module specifier. */
// "baseUrl": "./", /* Specify the base directory to resolve non-relative module names. */
// "paths": {}, /* Specify a set of entries that re-map imports to additional lookup locations. */
// "rootDirs": [], /* Allow multiple folders to be treated as one when resolving modules. */
// "typeRoots": [], /* Specify multiple folders that act like './node_modules/@types'. */
// "types": [], /* Specify type package names to be included without being referenced in a source file. */
// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
// "moduleSuffixes": [], /* List of file name suffixes to search when resolving a module. */
// "allowImportingTsExtensions": true, /* Allow imports to include TypeScript file extensions. Requires '--moduleResolution bundler' and either '--noEmit' or '--emitDeclarationOnly' to be set. */
// "rewriteRelativeImportExtensions": true, /* Rewrite '.ts', '.tsx', '.mts', and '.cts' file extensions in relative import paths to their JavaScript equivalent in output files. */
// "resolvePackageJsonExports": true, /* Use the package.json 'exports' field when resolving package imports. */
// "resolvePackageJsonImports": true, /* Use the package.json 'imports' field when resolving imports. */
// "customConditions": [], /* Conditions to set in addition to the resolver-specific defaults when resolving imports. */
// "noUncheckedSideEffectImports": true, /* Check side effect imports. */
// "resolveJsonModule": true, /* Enable importing .json files. */
// "allowArbitraryExtensions": true, /* Enable importing files with any extension, provided a declaration file is present. */
// "noResolve": true, /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */
/* JavaScript Support */
// "allowJs": true, /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */
// "checkJs": true, /* Enable error reporting in type-checked JavaScript files. */
// "maxNodeModuleJsDepth": 1, /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */
/* Emit */
// "declaration": true, /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
// "declarationMap": true, /* Create sourcemaps for d.ts files. */
// "emitDeclarationOnly": true, /* Only output d.ts files and not JavaScript files. */
// "sourceMap": true, /* Create source map files for emitted JavaScript files. */
// "inlineSourceMap": true, /* Include sourcemap files inside the emitted JavaScript. */
// "noEmit": true, /* Disable emitting files from a compilation. */
// "outFile": "./", /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
// "outDir": "./", /* Specify an output folder for all emitted files. */
// "removeComments": true, /* Disable emitting comments. */
// "importHelpers": true, /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
// "downlevelIteration": true, /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
// "sourceRoot": "", /* Specify the root path for debuggers to find the reference source code. */
// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSources": true, /* Include source code in the sourcemaps inside the emitted JavaScript. */
// "emitBOM": true, /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
// "newLine": "crlf", /* Set the newline character for emitting files. */
// "stripInternal": true, /* Disable emitting declarations that have '@internal' in their JSDoc comments. */
// "noEmitHelpers": true, /* Disable generating custom helper functions like '__extends' in compiled output. */
// "noEmitOnError": true, /* Disable emitting files if any type checking errors are reported. */
// "preserveConstEnums": true, /* Disable erasing 'const enum' declarations in generated code. */
// "declarationDir": "./", /* Specify the output directory for generated declaration files. */
/* Interop Constraints */
// "isolatedModules": true, /* Ensure that each file can be safely transpiled without relying on other imports. */
// "verbatimModuleSyntax": true, /* Do not transform or elide any imports or exports not marked as type-only, ensuring they are written in the output file's format based on the 'module' setting. */
// "isolatedDeclarations": true, /* Require sufficient annotation on exports so other tools can trivially generate declaration files. */
// "erasableSyntaxOnly": true, /* Do not allow runtime constructs that are not part of ECMAScript. */
// "allowSyntheticDefaultImports": true, /* Allow 'import x from y' when a module doesn't have a default export. */
"esModuleInterop": true, /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
// "preserveSymlinks": true, /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
"forceConsistentCasingInFileNames": true, /* Ensure that casing is correct in imports. */
/* Type Checking */
"strict": true, /* Enable all strict type-checking options. */
// "noImplicitAny": true, /* Enable error reporting for expressions and declarations with an implied 'any' type. */
// "strictNullChecks": true, /* When type checking, take into account 'null' and 'undefined'. */
// "strictFunctionTypes": true, /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
// "strictBindCallApply": true, /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */
// "strictPropertyInitialization": true, /* Check for class properties that are declared but not set in the constructor. */
// "strictBuiltinIteratorReturn": true, /* Built-in iterators are instantiated with a 'TReturn' type of 'undefined' instead of 'any'. */
// "noImplicitThis": true, /* Enable error reporting when 'this' is given the type 'any'. */
// "useUnknownInCatchVariables": true, /* Default catch clause variables as 'unknown' instead of 'any'. */
// "alwaysStrict": true, /* Ensure 'use strict' is always emitted. */
// "noUnusedLocals": true, /* Enable error reporting when local variables aren't read. */
// "noUnusedParameters": true, /* Raise an error when a function parameter isn't read. */
// "exactOptionalPropertyTypes": true, /* Interpret optional property types as written, rather than adding 'undefined'. */
// "noImplicitReturns": true, /* Enable error reporting for codepaths that do not explicitly return in a function. */
// "noFallthroughCasesInSwitch": true, /* Enable error reporting for fallthrough cases in switch statements. */
// "noUncheckedIndexedAccess": true, /* Add 'undefined' to a type when accessed using an index. */
// "noImplicitOverride": true, /* Ensure overriding members in derived classes are marked with an override modifier. */
// "noPropertyAccessFromIndexSignature": true, /* Enforces using indexed accessors for keys declared using an indexed type. */
// "allowUnusedLabels": true, /* Disable error reporting for unused labels. */
// "allowUnreachableCode": true, /* Disable error reporting for unreachable code. */
/* Completeness */
// "skipDefaultLibCheck": true, /* Skip type checking .d.ts files that are included with TypeScript. */
"skipLibCheck": true /* Skip type checking all .d.ts files. */
}
}