improves block functionality

adds cli compatible prompts/logs
adds logfile function for debug
adds multiselect support
new fieldRename
adds listFieldNames

.gitignore

@@ -1,3 +1,6 @@
 *.exe
 
-.env
+.env
+
+log.txt
+log

cli/TerminalLayout.ts

@@ -1,3 +1,6 @@
+import { log } from "util/logfile.ts";
+import { Cursor } from "./cursor.ts";
+
 export class TerminalLayout {
   private static ALT_BUFFER_ENABLE = "\x1b[?1049h";
   private static ALT_BUFFER_DISABLE = "\x1b[?1049l";
@@ -12,10 +15,16 @@ export class TerminalLayout {
   constructor() {
     Deno.stdout.writeSync(
       new TextEncoder().encode(
-        TerminalLayout.ALT_BUFFER_ENABLE + TerminalLayout.CURSOR_HIDE,
+        TerminalLayout.ALT_BUFFER_ENABLE,
       ),
     );
+    Cursor.hide();
     this.height = Deno.consoleSize().rows;
+
+    Deno.addSignalListener("SIGINT", () => {
+      this.clearAll();
+      Deno.exit(0);
+    });
   }
 
   register(name: string, block: TerminalBlock, fixedHeight?: number) {
@@ -71,16 +80,25 @@ export class TerminalLayout {
   }
 
   clearAll() {
+    log("clearAll");
     Deno.stdout.writeSync(
       new TextEncoder().encode(
-        TerminalLayout.ALT_BUFFER_DISABLE + TerminalLayout.CURSOR_SHOW,
+        TerminalLayout.ALT_BUFFER_DISABLE,
       ),
     );
+    Cursor.show();
     for (const name of this.layoutOrder) {
       this.blocks[name].clear();
     }
   }
 
+  clear() {
+    log("clear " + this.height);
+    for (let i = 0; i < this.height; i++) {
+      Deno.stdout.writeSync(new TextEncoder().encode("\x1b[2K\x1b[1E"));
+    }
+  }
+
   get availableHeight() {
     return this.height;
   }
@@ -96,14 +114,24 @@ export class TerminalBlock {
   private renderHeight: number = 0;
   private lastRenderRow = 1;
 
+  private preserveHistory = false;
+
   constructor(private prepend: string = "") {}
 
+  setPreserveHistory(preserveHistory: boolean) {
+    this.preserveHistory = preserveHistory;
+  }
+
   setLayout(layout: TerminalLayout) {
     this.layout = layout;
   }
 
-  setLines(lines: string[]) {
-    this.lines = lines;
+  setLines(lines: string[], range?: [number, number]) {
+    if (range && this.preserveHistory) {
+      this.lines.splice(range[0], range[1], ...lines);
+    } else {
+      this.lines = this.preserveHistory ? this.lines.concat(lines) : lines;
+    }
     if (this.scrollOffset > lines.length - 1) {
       this.scrollOffset = Math.max(0, lines.length - 1);
     }
@@ -115,6 +143,19 @@ export class TerminalBlock {
       );
       this.renderInternal();
     }
+    range = [
+      range?.[0] ?? this.lines.length - lines.length,
+      range ? range[0] + lines.length : this.lines.length,
+    ];
+    return range;
+  }
+
+  append(lines: string[]) {
+    this.lines.push(...lines);
+    this.scrollTo(this.lines.length - 1);
+    if (this.layout) {
+      this.layout.requestRender();
+    }
   }
 
   scrollTo(offset: number) {
@@ -144,15 +185,6 @@ export class TerminalBlock {
 
   setRenderLines(lines: string[]) {
     this.renderLines = lines;
-    this.renderedLineCount = lines.reduce(
-      (count, line) =>
-        count +
-        Math.ceil(
-          (this.prepend.length + line.length) /
-            (Deno.consoleSize().columns || 80),
-        ),
-      0,
-    );
   }
 
   setRenderHeight(height: number) {
@@ -165,19 +197,30 @@ export class TerminalBlock {
 
   renderInternal(startRow?: number) {
     this.lastRenderRow = startRow ?? this.lastRenderRow;
-    this.clear();
-    let output = this.renderLines.map((line) => `${this.prepend}${line}\x1b[K`)
-      .join("\n");
+    this.clear(); // uses old renderedLineCount
+
+    const outputLines = this.renderLines.map((line) =>
+      `${this.prepend}${line}\x1b[K`
+    );
+    const output = outputLines.join("\n");
     if (startRow !== undefined) {
       const moveCursor = `\x1b[${startRow};1H`;
-      output = moveCursor + output;
+      Deno.stdout.writeSync(new TextEncoder().encode(moveCursor + output));
+    } else {
+      Deno.stdout.writeSync(new TextEncoder().encode(output));
     }
-    Deno.stdout.writeSync(
-      new TextEncoder().encode(output),
+
+    // update rendered line count *after* rendering
+    this.renderedLineCount = outputLines.reduce(
+      (count, line) =>
+        count +
+        Math.ceil((line.length) / (Deno.consoleSize().columns || 80)),
+      0,
     );
   }
 
   clear() {
+    log(this.renderedLineCount);
     if (this.renderedLineCount === 0) return;
     const moveCursor = `\x1b[${this.lastRenderRow};1H`;
     Deno.stdout.writeSync(new TextEncoder().encode(moveCursor));
@@ -187,6 +230,11 @@ export class TerminalBlock {
     this.renderedLineCount = 0;
   }
 
+  clearAll() {
+    this.clear();
+    this.lines = [];
+  }
+
   setFixedHeight(height: number) {
     this.fixedHeight = height;
   }

cli/cursor.ts

@@ -0,0 +1,29 @@
+export class Cursor {
+  private static visible = true;
+
+  static show() {
+    this.visible = true;
+    Deno.stdout.writeSync(new TextEncoder().encode("\x1b[?25h"));
+  }
+
+  static hide() {
+    this.visible = false;
+    Deno.stdout.writeSync(new TextEncoder().encode("\x1b[?25l"));
+  }
+
+  static restoreVisibility() {
+    if (this.visible) {
+      this.show();
+    } else {
+      this.hide();
+    }
+  }
+
+  static savePosition() {
+    Deno.stdout.writeSync(new TextEncoder().encode("\x1b7"));
+  }
+
+  static restorePosition() {
+    Deno.stdout.writeSync(new TextEncoder().encode("\x1b8"));
+  }
+}

cli/forceArgs.ts

@@ -0,0 +1,29 @@
+import { cliPrompt } from "./prompts.ts";
+import type { TerminalBlock } from "./TerminalLayout.ts";
+
+type prompt = [string, (v?: string) => boolean] | string;
+
+export async function forceArgs(
+  args: string[],
+  prompts: prompt[],
+  block?: TerminalBlock,
+) {
+  const newArgs: string[] = [];
+  for (const [i, arg] of args.entries()) {
+    if (typeof prompts[i] === "string") {
+      let val = arg;
+      while (!val) {
+        val = await cliPrompt(prompts[i], block) || "";
+      }
+      newArgs.push(val);
+    } else {
+      const [promptText, validation] = prompts[i];
+      let val = arg;
+      while (!validation(val)) {
+        val = await cliPrompt(promptText, block) || "";
+      }
+      newArgs.push(val);
+    }
+  }
+  return newArgs;
+}

cli/index.ts

@@ -1,9 +1,10 @@
 import { getAsciiArt } from "../util/asciiArt.ts";
 import { toCase } from "util/caseManagement.ts";
 import { ArgParser } from "./argParser.ts";
-import { colorize } from "./colorize.ts";
+import { colorize } from "./style.ts";
 import { selectMenuInteractive } from "./selectMenu.ts";
 import { TerminalBlock, TerminalLayout } from "./TerminalLayout.ts";
+import { cliAlert, cliLog } from "./prompts.ts";
 
 export class PdfToolsCli {
   private tools: Map<string, ITool> = new Map();
@@ -30,56 +31,98 @@ export class PdfToolsCli {
 
   private async banana() {
     const asciiArt = await getAsciiArt("banana");
-    console.log(colorize(asciiArt, "yellow"));
+    const body = this.terminalLayout.getBlock("body");
+    body.clearAll();
+    cliLog(colorize(asciiArt, "yellow"), body);
   }
 
-  private help() {
-    console.log("BearMetal PDF CLI");
+  private async help() {
+    this.terminalLayout.clear();
+    this.ensmallenHeader("Help");
+    const bodyBlock = this.terminalLayout.getBlock("body");
+    bodyBlock.clearAll();
+    await cliAlert("BearMetal PDF CLI\n", bodyBlock);
+    await this.embiggenHeader();
   }
 
   public async run() {
     try {
-      const lines: string[] = [];
-      for (const t of ["bearmetal:porple", "pdftools:cyan"]) {
-        const [name, color] = t.split(":");
-        const asciiArt = await getAsciiArt(name);
-        lines.push(...colorize(asciiArt, color).split("\n"));
-      }
       const titleBlock = new TerminalBlock();
       this.terminalLayout.register("title", titleBlock);
       const bodyBlock = new TerminalBlock();
       this.terminalLayout.register("body", bodyBlock);
-      titleBlock.setFixedHeight(lines.length);
-      titleBlock.setLines(lines);
+      this.embiggenHeader();
       if (Deno.args.length === 0) {
         // console.log(
         //   colorize("No tool specified. Importing all tools...", "gray"),
         // );
         await this.importTools();
       }
-      this.toolMenu();
+      await this.toolMenu();
     } finally {
       this.terminalLayout.clearAll();
+      Deno.stdin.setRaw(false);
     }
   }
 
   private async toolMenu() {
     const tools = this.tools.keys().toArray();
     const bodyBlock = this.terminalLayout.getBlock("body");
-    const selected = await selectMenuInteractive("Choose a tool", tools, {
-      terminalBlock: bodyBlock,
-    });
-    bodyBlock.clear();
+    bodyBlock.clearAll();
+    bodyBlock.setPreserveHistory(false);
+    const selected = await selectMenuInteractive(
+      "Choose a tool",
+      tools.concat(["Help", "Exit"]),
+      {
+        terminalBlock: bodyBlock,
+      },
+    );
     if (!selected) return;
+    if (selected === "Exit") {
+      return;
+    }
     await this.runTool(selected);
-    this.toolMenu();
+    await this.toolMenu();
   }
 
   private async runTool(toolName: string) {
+    if (toolName === "Help") {
+      return await this.help();
+    }
     const tool = this.tools.get(toolName);
     if (tool) {
+      this.ensmallenHeader(tool.name + " - " + tool.description);
+      const bodyBlock = this.terminalLayout.getBlock("body");
+      bodyBlock.clearAll();
+      tool.setBlock?.(bodyBlock);
       await tool.run();
       await tool.done?.();
+      this.embiggenHeader();
     }
   }
+
+  private ensmallenHeader(subtitle: string) {
+    this.terminalLayout.clear();
+    const titleBlock = this.terminalLayout.getBlock("title");
+    titleBlock.clear();
+    titleBlock.setFixedHeight(3);
+    titleBlock.setLines([
+      colorize("BearMetal PDF Tools", "porple"),
+      colorize(subtitle, "gray"),
+      "-=".repeat(Deno.consoleSize().columns / 2),
+    ]);
+  }
+
+  private async embiggenHeader() {
+    const titleBlock = this.terminalLayout.getBlock("title");
+    titleBlock.clear();
+    const lines: string[] = [];
+    for (const t of ["bearmetal:porple", "pdftools:cyan"]) {
+      const [name, color] = t.split(":");
+      const asciiArt = await getAsciiArt(name);
+      lines.push(...colorize(asciiArt, color).split("\n"));
+    }
+    titleBlock.setFixedHeight(lines.length);
+    titleBlock.setLines(lines);
+  }
 }

cli/prompts.ts

@@ -0,0 +1,124 @@
+import { Cursor } from "./cursor.ts";
+import { colorize } from "./style.ts";
+import { TerminalBlock, TerminalLayout } from "./TerminalLayout.ts";
+
+export async function cliPrompt(
+  message: string,
+  block?: TerminalBlock,
+): Promise<string> {
+  const encoder = new TextEncoder();
+  const input: string[] = [];
+
+  await Deno.stdin.setRaw(true);
+
+  let cursorVisible = true;
+  if (!block) {
+    cursorVisible = Cursor["visible"];
+    Cursor.show();
+  }
+
+  let range: [number, number] = [0, 1];
+  if (block) {
+    range = block.setLines([message + " "]);
+  } else {
+    Deno.stdout.writeSync(encoder.encode(message + " "));
+  }
+
+  const buf = new Uint8Array(1);
+  while (true) {
+    const n = await Deno.stdin.read(buf);
+    if (n === null) break;
+    const byte = buf[0];
+
+    if (byte === 3) { // Ctrl+C
+      Deno.stdin.setRaw(false);
+      block?.["layout"]?.clearAll();
+      block?.clear();
+      Deno.exit(130);
+    }
+
+    if (byte === 13) { // Enter
+      break;
+    } else if (byte === 127 || byte === 8) { // Backspace
+      input.pop();
+    } else if (byte >= 32 && byte <= 126) { // Printable chars
+      input.push(String.fromCharCode(byte));
+    }
+
+    const line = message + " " + input.join("");
+    if (block) {
+      range = block.setLines([line], range);
+    } else {
+      Deno.stdout.writeSync(encoder.encode("\r\x1b[K" + line));
+    }
+  }
+
+  await Deno.stdin.setRaw(false);
+  if (!block && !cursorVisible) {
+    Cursor.hide();
+  }
+  Deno.stdout.writeSync(encoder.encode("\n"));
+
+  return input.join("");
+}
+
+export function cliConfirm(message: string, block?: TerminalBlock) {
+  return cliPrompt(message + " (y/n)", block).then((v) =>
+    v.toLowerCase() === "y"
+  );
+}
+
+export function cliAlert(message: string, block?: TerminalBlock) {
+  return cliPrompt(
+    message + colorize(" Press Enter to continue", "gray"),
+    block,
+  ).then((v) => {
+    return v;
+  });
+}
+
+export function cliLog(message: string, block?: TerminalBlock) {
+  if (!block) {
+    console.log(message);
+  } else {
+    block.setLines(message.split("\n"));
+  }
+}
+
+if (import.meta.main) {
+  const layout = new TerminalLayout();
+  const title = new TerminalBlock();
+  const block = new TerminalBlock();
+  block.setPreserveHistory(true);
+  title.setLines(["Hello, World!"]);
+  title.setFixedHeight(1);
+
+  layout.register("title", title);
+  layout.register("block", block);
+
+  Deno.addSignalListener("SIGINT", () => {
+    layout.clearAll();
+    // console.clear();
+    Deno.exit(0);
+  });
+  const name = await cliPrompt("Enter your name:", block);
+  cliLog(`Hello, ${name}!`, block);
+  const single = await cliConfirm("Are you single?", block);
+  cliLog(single ? "Do you want to go out with me?" : "Okay", block);
+  const loopingConvo = [
+    "No response?",
+    "I guess that's okay",
+    "Maybe I'll see you next week?",
+    "Wow, really not going to say anything to me?",
+    "Well, if that's how you feel",
+  ];
+  let convo = 0;
+  setInterval(() => {
+    cliLog(loopingConvo[convo % loopingConvo.length], block);
+    convo++;
+  }, 2000);
+  // setTimeout(async () => {
+  //   await cliAlert("Well, if that's that...", block);
+  //   Deno.exit(0);
+  // }, 10000);
+}

cli/selectMenu.ts

@@ -1,9 +1,10 @@
-import { colorize } from "./colorize.ts";
-import { TerminalBlock, TerminalLayout } from "./TerminalLayout.ts";
+import { colorize } from "./style.ts";
+import { TerminalBlock } from "./TerminalLayout.ts";
 
 interface ISelectMenuConfig {
-  multiSelect?: boolean;
   terminalBlock?: TerminalBlock;
+  initialSelection?: number;
+  initialSelections?: number[];
 }
 
 export function selectMenu(items: string[]) {
@@ -21,18 +22,12 @@ export async function selectMenuInteractive(
   Deno.stdin.setRaw(true);
   let selected = 0;
 
-  if (config?.multiSelect) {
-    console.warn("Multi-select not implemented yet");
-    return null;
-  }
-
   const terminalBlock = config?.terminalBlock || new TerminalBlock();
   if (!config?.terminalBlock) {
     terminalBlock.setRenderHeight(Deno.consoleSize().rows);
   }
 
-  console.log(terminalBlock.getRenderHeight());
-
+  let range: [number, number] = [terminalBlock.lineCount, 1];
   function renderMenu() {
     const { rows } = Deno.consoleSize();
     const terminalHeight = terminalBlock.getRenderHeight() || rows;
@@ -54,7 +49,7 @@ export async function selectMenuInteractive(
       }
     }
 
-    terminalBlock.setLines(lines);
+    range = terminalBlock.setLines(lines, range);
   }
 
   function numberAndPadding(i: number, prefix?: string) {
@@ -78,7 +73,7 @@ export async function selectMenuInteractive(
 
       if (a === 3) {
         Deno.stdin.setRaw(false);
-        console.log("\nInterrupted\n");
+        terminalBlock?.["layout"]?.clearAll();
         Deno.exit(130);
       }
 
@@ -105,13 +100,112 @@ export async function selectMenuInteractive(
       }
     }
 
-    terminalBlock.clear();
     Deno.stdin.setRaw(false);
     return options[selected];
   }
+  terminalBlock.setLines(["Selected: " + options[selected]], range);
   return await handleInput();
 }
 
+export async function multiSelectMenuInteractive(
+  q: string,
+  options: string[] | [string, callback][],
+  config?: ISelectMenuConfig,
+): Promise<string[] | null> {
+  Deno.stdin.setRaw(true);
+  let selected = 0;
+  let selectedOptions: number[] = config?.initialSelections || [];
+
+  const rawValues = new Set(
+    options.map((i) => typeof i === "string" ? i : i[0]),
+  ).values().toArray();
+
+  if (rawValues.length !== options.length) {
+    throw new Error("Duplicate options in multi-select menu");
+  }
+
+  const terminalBlock = config?.terminalBlock || new TerminalBlock();
+  if (!config?.terminalBlock) {
+    terminalBlock.setRenderHeight(Deno.consoleSize().rows);
+  }
+
+  let range: [number, number] = [terminalBlock.lineCount, 1];
+  function renderMenu() {
+    const { rows } = Deno.consoleSize();
+    const terminalHeight = terminalBlock.getRenderHeight() || rows;
+    const maxHeight = Math.min(terminalHeight - 1, options.length);
+    let startPoint = Math.max(0, selected - Math.floor(maxHeight / 2));
+    const endPoint = Math.min(options.length, startPoint + maxHeight);
+    if (endPoint - startPoint < maxHeight) {
+      startPoint = Math.max(0, options.length - maxHeight);
+    }
+
+    const lines: string[] = [];
+    lines.push(colorize(q, "green"));
+    for (let i = startPoint; i < endPoint; i++) {
+      const option = rawValues[i];
+      const checkbox = selectedOptions.includes(i)
+        ? colorize("◼", "green")
+        : "◻";
+      if (i === selected) {
+        lines.push(`> ${checkbox} ${colorize(option, "porple")}`);
+      } else {
+        lines.push(`  ${checkbox} ${option}`);
+      }
+    }
+
+    range = terminalBlock.setLines(lines, range);
+  }
+
+  // Function to handle input
+  async function handleInput() {
+    const buf = new Uint8Array(3); // arrow keys send 3 bytes
+    while (true) {
+      renderMenu();
+      const n = await Deno.stdin.read(buf);
+      if (n === null) break;
+
+      const [a, b, c] = buf;
+
+      if (a === 3) {
+        Deno.stdin.setRaw(false);
+        terminalBlock?.["layout"]?.clearAll();
+        Deno.exit(130);
+      }
+
+      if (a === 13) { // Enter key
+        break;
+      } else if (a === 27 && b === 91) { // Arrow keys
+        if (c === 65) { // Up
+          selected = (selected - 1 + options.length) % options.length;
+        } else if (c === 66) { // Down
+          selected = (selected + 1) % options.length;
+        }
+      } else if (a === 32) { // Space
+        Deno.stdout.writeSync(new TextEncoder().encode("\x07"));
+        if (selectedOptions.includes(selected)) {
+          selectedOptions = selectedOptions.filter((i) => i !== selected);
+        } else {
+          selectedOptions.push(selected);
+        }
+      }
+    }
+
+    Deno.stdin.setRaw(false);
+    return selectedOptions;
+  }
+  const selections = await handleInput();
+  for (const optionI of selections) {
+    const option = options[optionI];
+    if (Array.isArray(option)) {
+      await option[1](option[0]);
+    }
+  }
+  const final = selectedOptions.map((i) => rawValues[i]);
+  terminalBlock.setLines(["Selected: " + final.join(", ")], range);
+  return final;
+}
+
 if (import.meta.main) {
   // const layout = new TerminalLayout();
   // const block = new TerminalBlock();
@@ -154,7 +248,7 @@ if (import.meta.main) {
   // layout.clearAll();
   // console.log(val);
 
-  const val = await selectMenuInteractive("choose a fruit", [
+  const val = await multiSelectMenuInteractive("choose a fruit", [
     "apple",
     "banana",
     "cherry",
@@ -183,4 +277,6 @@ if (import.meta.main) {
     "zucchini",
   ]);
   console.log(val);
+
+  // Deno.stdout.writeSync(new TextEncoder().encode("\x07"));
 }

tools/checkCode.ts

@@ -1,4 +1,3 @@
-import { PDFDocument } from "pdf-lib";
 import { loadPdfForm } from "../util/saveLoadPdf.ts";
 import { callWithArgPrompt } from "util/call.ts";
 

tools/fieldRename.ts

@@ -1,13 +1,11 @@
-import {
-  PDFAcroField,
-  PDFHexString,
-  PDFName,
-  PDFString,
-  toHexString,
-} from "pdf-lib";
-import { loadPdfForm, savePdf } from "util/saveLoadPdf.ts";
-import { PDFDocument } from "pdf-lib";
-import { call, callWithArgPrompt } from "util/call.ts";
+import { type PDFAcroField, type PDFField, PDFName, PDFString } from "pdf-lib";
+import { loadPdf, loadPdfForm, savePdf } from "util/saveLoadPdf.ts";
+import { callWithArgPrompt } from "util/call.ts";
+import { TerminalBlock } from "../cli/TerminalLayout.ts";
+import { forceArgs } from "../cli/forceArgs.ts";
+import { colorize } from "../cli/style.ts";
+import { cliLog, cliPrompt } from "../cli/prompts.ts";
+import { multiSelectMenuInteractive } from "../cli/selectMenu.ts";
 
 // const thing = PDFAcroField.prototype.getFullyQualifiedName;
 // PDFAcroField.prototype.getFullyQualifiedName = function () {
@@ -80,18 +78,108 @@ async function renameFields(
   }
 }
 
+function applyRename(
+  field: PDFField,
+  name: string,
+  pattern: RegExp,
+  change: string,
+) {
+  const segments = name.split(".");
+  const matchingSegments = segments.filter((s) => pattern.test(s));
+  let cField: PDFAcroField | undefined = field.acroField;
+  while (cField) {
+    if (
+      cField.getPartialName() &&
+      matchingSegments.includes(cField.getPartialName()!)
+    ) {
+      const mName = cField.getPartialName()?.replace(pattern, change);
+      if (mName) {
+        cField.dict.set(PDFName.of("T"), PDFString.of(mName));
+        // console.log(cField.getPartialName())
+      }
+    }
+    cField = cField.getParent();
+    // console.log(cField?.getPartialName())
+  }
+}
+
+function evaluateChange(change: string, match: RegExpExecArray) {
+  return change.replace(
+    /\$(\d+)(i?)/g,
+    (_, i, indexed) =>
+      indexed
+        ? (parseInt(match[i]) ? (parseInt(match[i]) - 1).toString() : match[i])
+        : match[i],
+  );
+}
+
 class RenameFields implements ITool {
   name = "renamefields";
   description = "Renames fields in a PDF form";
-  help() {
-    console.log("Usage: renamefields <pdfPath> <pattern> <change>");
+  block: TerminalBlock | undefined;
+
+  setBlock(block: TerminalBlock) {
+    this.block = block;
+  }
+
+  help(standalone = false) {
+    cliLog(
+      "Usage: renamefields <pdfPath> <pattern> <change>",
+      standalone ? undefined : this.block,
+    );
   }
   async run(pdfPath: string = "", pattern: string = "", change: string = "") {
-    await callWithArgPrompt(renameFields, [
-      ["Please provide path to PDF:", (p) => !!p && p.endsWith(".pdf")],
-      "Please provide search string:",
-      "Please provide requested change:",
-    ], [pdfPath, pattern, change]);
+    if (!this.block) {
+      this.block = new TerminalBlock();
+    }
+    this.block.setPreserveHistory(true);
+
+    [pdfPath, pattern, change] = await forceArgs(
+      [pdfPath, pattern, change],
+      [
+        ["Please provide path to PDF:", (p) => !!p && p.endsWith(".pdf")],
+        "Please provide search string:",
+        "Please provide requested change:",
+      ],
+      this.block,
+    );
+
+    const patternRegex = new RegExp(pattern);
+
+    const pdf = await loadPdf(pdfPath);
+    const form = pdf.getForm();
+    const fields = form.getFields();
+
+    const foundUpdates: [string, callback][] = [];
+
+    for (const field of fields) {
+      const name = field.getName();
+      const match = patternRegex.exec(name);
+      if (match) {
+        const toChange = evaluateChange(change, match);
+        foundUpdates.push([
+          `${colorize(name, "red")} -> ${colorize(toChange, "green")}`,
+          () => {
+            applyRename(field, name, patternRegex, toChange);
+          },
+        ]);
+      }
+    }
+
+    if (foundUpdates.length) {
+      cliLog("Found updates:", this.block);
+      await multiSelectMenuInteractive(
+        "Please select an option to apply",
+        foundUpdates,
+        { terminalBlock: this.block },
+      );
+    }
+
+    const path = await cliPrompt(
+      "Save to path (or hit enter to keep current):",
+      this.block,
+    );
+    await savePdf(pdf, path || pdfPath);
   }
 }
 export default new RenameFields();

tools/listFormFields.ts

@@ -0,0 +1,56 @@
+import { forceArgs } from "../cli/forceArgs.ts";
+import { cliAlert } from "../cli/prompts.ts";
+import { TerminalBlock } from "../cli/TerminalLayout.ts";
+import { loadPdfForm } from "util/saveLoadPdf.ts";
+
+export class ListFormFields implements ITool {
+  name = "listformfields";
+  description = "Lists fields in a PDF form";
+  block?: TerminalBlock;
+  async run(pdfPath: string = "") {
+    if (!this.block) {
+      this.block = new TerminalBlock();
+    }
+    this.block.setPreserveHistory(true);
+    [pdfPath] = await forceArgs([pdfPath], [[
+      "Please provide path to PDF:",
+      (p) => !!p && p.endsWith(".pdf"),
+    ]], this.block);
+
+    const form = await loadPdfForm(pdfPath);
+    const fields = form.getFields();
+    const height = this.block.getRenderHeight() - 1;
+    const fieldNames = fields.sort((a, b) => {
+      const aRect = a.acroField.getWidgets().find((e) => e.Rect())?.Rect()
+        ?.asRectangle();
+      const bRect = b.acroField.getWidgets().find((e) => e.Rect())?.Rect()
+        ?.asRectangle();
+
+      if (aRect && bRect) {
+        if (aRect.x !== bRect.x) {
+          return aRect.x - bRect.x; // Sort left to right
+        } else {
+          return bRect.y - aRect.y; // If x is equal, sort top to bottom
+        }
+      }
+      return a.getName().localeCompare(b.getName());
+    }).map((f) => f.getName());
+    const maxLength = Math.max(...fieldNames.map((f) => f.length)) + 4;
+    const lines = [];
+    for (let i = 0; i < height; i++) {
+      let line = "";
+      for (let j = 0; j < fieldNames.length; j += height) {
+        const fieldName = fieldNames[i + j] ?? "";
+        line += fieldName.padEnd(maxLength, " ");
+      }
+      lines.push(line);
+    }
+    this.block.setLines(lines, [0, 1]);
+    await cliAlert("", this.block);
+  }
+  setBlock(terminalBlock: TerminalBlock) {
+    this.block = terminalBlock;
+  }
+}
+
+export default new ListFormFields();

types.ts

@@ -1,3 +1,5 @@
+import type { TerminalBlock } from "./cli/TerminalLayout.ts";
+
 declare global {
   type ToolFunc<T extends unknown[]> = (...args: T) => Promise<void>;
   interface ITool {
@@ -6,5 +8,8 @@ declare global {
     run: ToolFunc<any[]>;
     help?: () => Promise<void> | void;
     done?: () => Promise<void> | void;
+    setBlock?: (block: TerminalBlock) => void;
   }
+
+  type callback = (...args: any[]) => any;
 }

util/dedent.ts

@@ -0,0 +1,18 @@
+export function dedent(str: string) {
+  const lines = str.split("\n");
+  const indent = lines.reduce((count, line) => {
+    if (line.trim() === "") return count;
+    const match = line.match(/^(\s*)/);
+    return match ? Math.min(count, match[1].length) : count;
+  }, Infinity);
+  return lines.map((line) => line.slice(indent)).join("\n");
+}
+
+if (import.meta.main) {
+  console.log(dedent(`
+    Hello, World!
+      This is a paragraph
+      that spans multiple lines.
+    And this is another paragraph.
+  `));
+}

util/logfile.ts

@@ -0,0 +1,15 @@
+const logFile = Deno.openSync("./log.txt", {
+  create: true,
+  write: true,
+  read: true,
+  append: true,
+});
+
+logFile.truncateSync(0);
+
+export function log(message: any) {
+  if (typeof message === "object") {
+    message = JSON.stringify(message);
+  }
+  logFile.writeSync(new TextEncoder().encode(message + "\n"));
+}