From f9dec6d1e0c82f846dc83ef1446a2123c36218a1 Mon Sep 17 00:00:00 2001 From: Francisco Pessano Date: Thu, 13 Mar 2025 16:26:12 -0300 Subject: [PATCH] Add PDF manipulation functionality with options to duplicate pages and combine pages 2-up --- .gitignore | 1 + package.json | 26 ++ pnpm-lock.yaml | 939 +++++++++++++++++++++++++++++++++++++++++++++++++ src/index.ts | 351 ++++++++++++++++++ tsconfig.json | 113 ++++++ 5 files changed, 1430 insertions(+) create mode 100644 .gitignore create mode 100644 package.json create mode 100644 pnpm-lock.yaml create mode 100644 src/index.ts create mode 100644 tsconfig.json diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..b512c09 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +node_modules \ No newline at end of file diff --git a/package.json b/package.json new file mode 100644 index 0000000..0fb988b --- /dev/null +++ b/package.json @@ -0,0 +1,26 @@ +{ + "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": { + "@types/inquirer": "^9.0.7", + "inquirer": "^12.4.3", + "inquirer-fuzzy-path": "^2.3.0", + "pdf-lib": "^1.17.1" + } +} diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml new file mode 100644 index 0000000..f1014a9 --- /dev/null +++ b/pnpm-lock.yaml @@ -0,0 +1,939 @@ +lockfileVersion: '9.0' + +settings: + autoInstallPeers: true + excludeLinksFromLockfile: false + +importers: + + .: + dependencies: + '@types/inquirer': + specifier: ^9.0.7 + version: 9.0.7 + inquirer: + specifier: ^12.4.3 + version: 12.4.3(@types/node@22.13.10) + inquirer-fuzzy-path: + specifier: ^2.3.0 + version: 2.3.0 + pdf-lib: + specifier: ^1.17.1 + version: 1.17.1 + 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'@types/node': 22.13.10 + acorn: 8.14.1 + acorn-walk: 8.3.4 + arg: 4.1.3 + create-require: 1.1.1 + diff: 4.0.2 + make-error: 1.3.6 + typescript: 5.8.2 + v8-compile-cache-lib: 3.0.1 + yn: 3.1.1 + + tslib@1.14.1: {} + + tslib@2.8.1: {} + + type-fest@0.21.3: {} + + typescript@5.8.2: {} + + undici-types@6.20.0: {} + + v8-compile-cache-lib@3.0.1: {} + + wrap-ansi@6.2.0: + dependencies: + ansi-styles: 4.3.0 + string-width: 4.2.3 + strip-ansi: 6.0.1 + + yn@3.1.1: {} + + yoctocolors-cjs@2.1.2: {} diff --git a/src/index.ts b/src/index.ts new file mode 100644 index 0000000..4d33cd5 --- /dev/null +++ b/src/index.ts @@ -0,0 +1,351 @@ +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 { + 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 { + // 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>({ + 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>({ + 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>({ + 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: ${outputPath}`); + } else { + // "Combine pages 2 in 1" + + // 4.1) Ask orientation + // - "vertical" => side by side + // - "horizontal" => top/bottom with rotation + // - "stacked" => top/bottom no rotation + const { orientation } = await inquirer.prompt< + Pick + >({ + type: "list", + name: "orientation", + message: "Select arrangement (affects content placement):", + choices: [ + { name: "Vertical (side-by-side)", value: "vertical" }, + { name: "Horizontal (top/bottom, rotated)", value: "horizontal" }, + { name: "Stacked (top/bottom, no rotation)", value: "stacked" }, + ], + }); + + // 4.2) Ask if user wants to specify a paper size + const { specifyPaperSize } = await inquirer.prompt< + Pick + >({ + type: "confirm", + name: "specifyPaperSize", + message: "Would you like to choose a common paper size for the output?", + default: false, + }); + + let chosenPaperSize: [number, number] | undefined = undefined; + if (specifyPaperSize) { + const { selectedSize } = await inquirer.prompt< + Pick + >({ + type: "list", + name: "selectedSize", + message: "Select a paper size (output will be portrait):", + choices: [ + { name: "A4 (210 × 297 mm)", value: [595.28, 841.89] }, + { name: "Letter (8.5 × 11 in)", value: [612, 792] }, + { name: "Legal (8.5 × 14 in)", value: [612, 1008] }, + { name: "A3 (297 × 420 mm)", value: [841.89, 1190.55] }, + { name: "Tabloid (11 × 17 in)", value: [792, 1224] }, + ], + }); + chosenPaperSize = selectedSize; + } + + // 4.3) Output path + const outputPath = path.join( + path.dirname(pdfPath), + `${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(); diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..904d43f --- /dev/null +++ b/tsconfig.json @@ -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 ''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. */ + } +}