txt to pdf implementation

package.json

@@ -46,6 +46,7 @@
     "@types/jszip": "^3.4.0",
     "@types/less": "^3.0.8",
     "@types/opentype.js": "^1.3.9",
+    "@types/pdfkit": "^0.17.6",
     "electron": "^40.6.0",
     "electron-builder": "^26.8.1",
     "puppeteer": "^24.36.0",
@@ -54,7 +55,6 @@
     "vite-tsconfig-paths": "^6.0.5"
   },
   "dependencies": {
-    "7z-wasm": "^1.2.0",
     "@bjorn3/browser_wasi_shim": "^0.4.2",
     "@bokuweb/zstd-wasm": "^0.0.27",
     "@ffmpeg/core": "^0.12.10",
@@ -73,6 +73,7 @@
     "@types/pako": "^2.0.4",
     "@types/papaparse": "^5.5.2",
     "@types/three": "^0.182.0",
+    "7z-wasm": "^1.2.0",
     "bson": "^7.2.0",
     "celaria-formats": "^1.0.2",
     "chess.js": "^1.4.0",
@@ -90,6 +91,7 @@
     "pako": "^2.1.0",
     "papaparse": "^5.5.3",
     "pdf-parse": "^2.4.5",
+    "pdfkit": "^0.18.0",
     "pdftoimg-js": "^0.2.5",
     "pe-library": "^2.0.1",
     "sass": "^1.98.0",

src/handlers/index.ts

@@ -71,6 +71,7 @@ import piskelHandler from "./piskel.ts";
 import xcursorHandler from "./xcursor.ts";
 import shToElfHandler from "./shToElf.ts";
 import cssHandler from "./css.ts";
+import textToPdfHandler from "./text-to-pdf.ts";
 import TypstHandler from "./typst.ts";
 
 const handlers: FormatHandler[] = [];
@@ -148,6 +149,7 @@ try { handlers.push(new fenToJsonHandler()) } catch (_) { };
 try { handlers.push(new piskelHandler()) } catch (_) { };
 try { handlers.push(new xcursorHandler()) } catch (_) { };
 try { handlers.push(new shToElfHandler()) } catch (_) { };
+try { handlers.push(new textToPdfHandler()) } catch (_) { };
 try { handlers.push(new cssHandler()) } catch (_) { };
 try { handlers.push(new TypstHandler()) } catch (_) { };
 

src/handlers/text-to-pdf.ts

@@ -0,0 +1,76 @@
+import { type FileData, type FileFormat, type FormatHandler } from "../FormatHandler.ts";
+import CommonFormats from "../CommonFormats.ts";
+import PDFDocument from "pdfkit/js/pdfkit.standalone";
+
+class textToPdfHandler implements FormatHandler {
+  public name = "text-to-pdf";
+  public supportedFormats?: FileFormat[] = [
+      CommonFormats.TEXT.builder("text").allowFrom(true).allowTo(false),
+      CommonFormats.PDF.builder("pdf").allowFrom(false).allowTo(true).markLossless(),
+  ];
+  public ready = false;
+
+  async init() {
+    this.ready = true;
+  }
+
+  async doConvert(
+    inputFiles: FileData[],
+    inputFormat: FileFormat,
+    outputFormat: FileFormat,
+  ): Promise<FileData[]> {
+    const outputFiles: FileData[] = [];
+
+    for (const file of inputFiles) {
+      const rawText = new TextDecoder().decode(file.bytes);
+      const hasLetters = /\p{L}/u.test(rawText);
+      const hasEmojis = /\p{Emoji}/u.test(rawText);
+      if (hasEmojis && !hasLetters) {
+        throw `Input file "${file.name}" does not contain any letters, only emojis.`;
+      }
+      let text = rawText;
+      if (hasEmojis) {
+        text = rawText.replace(/\p{Emoji}/gu, " "); // Remove emojis
+      }
+
+      const doc = new PDFDocument({
+        size: "A4",
+        margins: { top: 72, bottom: 72, left: 72, right: 72 },
+      });
+
+      const pdfBytes = await new Promise<Uint8Array>((resolve, reject) => {
+        const chunks: Uint8Array[] = [];
+
+        doc.on("data", (chunk: Uint8Array) => chunks.push(chunk));
+        doc.on("end", async () => {
+          try {
+            const buffer = await new Blob(chunks as BlobPart[], { type: "application/pdf" }).arrayBuffer();
+            resolve(new Uint8Array(buffer));
+          } catch (error) {
+            reject(error);
+          }
+        });
+
+        doc.on("error", reject);
+
+        doc.font("Courier").fontSize(11).fillColor("#000000");
+        doc.text(text.replace(/\r\n|\r/g, '\n'), {
+          width: 595.28 - 72 - 72,
+          align: "left",
+        });
+
+        doc.end();
+      });
+
+      const basename = file.name.split(".").slice(0, -1).join(".") || "document";
+      outputFiles.push({
+        name: `${basename}.${outputFormat.extension}`,
+        bytes: pdfBytes,
+      });
+    }
+
+    return outputFiles;
+  }
+}
+
+export default textToPdfHandler;

tsconfig.json

@@ -9,7 +9,9 @@
       "DOM.Iterable"
     ],
     "types": [
-      "vite/client"
+      "vite/client",
+      "node",
+      "@types/pdfkit"
     ],
     "skipLibCheck": true,
     /* Bundler mode */