feat: add all-fonts slash command

README.md

@@ -19,6 +19,12 @@ npm start
 The global `Fontify` message command is refreshed at startup. In Discord, right-click a message,
 open Apps, select Fontify, and choose a font. Only the user who opened the menu can choose from it.
 
+Use `/fontify-all text:Hello world` to post all 14 available styles together, with
+font names and copyable code blocks. The text option accepts up to 200 characters.
+Long results are automatically split into messages without truncation; mentions
+are disabled. Characters without a font mapping (including Japanese) stay unchanged.
+Both commands are registered globally at startup.
+
 ## Develop
 
 ```sh

package-lock.json

@@ -1155,9 +1155,9 @@
       }
     },
     "node_modules/undici": {
-      "version": "6.28.0",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-6.28.0.tgz",
-      "integrity": "sha512-LIY910g9TI13YS95lrMFrs8Rm/u/irgHeTWoKCoteeJ04CUJ92eEfj0rVn+7VKMPBpUPiUoBKfhNyLI23EE/KA==",
+      "version": "6.29.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-6.29.0.tgz",
+      "integrity": "sha512-R+RODBqp6i2pPflGdq+xIOUkl+RNfGgHwoinecKu/JCuf2uO06cOKoDbI2P7Dn6KcswdKwrczbU6IYJ6K8X+wg==",
       "license": "MIT",
       "engines": {
         "node": ">=18.17"

src/all_fonts.ts

@@ -0,0 +1,25 @@
+import list from "./fontlist.ts";
+import { translateText } from "./translation.ts";
+
+export const ALL_FONTS_MAX_INPUT = 200;
+
+/** Keep each labelled font together; never split Unicode or truncate output. */
+export function formatAllFonts(text: string): string[] {
+  if (!text.trim() || text.length > ALL_FONTS_MAX_INPUT) {
+    throw new RangeError(`Text must contain 1–${ALL_FONTS_MAX_INPUT} characters.`);
+  }
+  const messages: string[] = [];
+  let current = "";
+  for (const { label, font } of list) {
+    const translated = translateText(text, font).replaceAll("```", "``\u200b`");
+    const block = `**${label}**\n\`\`\`\n${translated}\n\`\`\``;
+    if (block.length > 2_000) throw new RangeError("Font output exceeds Discord's limit.");
+    if (current && current.length + 2 + block.length > 2_000) {
+      messages.push(current);
+      current = "";
+    }
+    current += `${current ? "\n\n" : ""}${block}`;
+  }
+  if (current) messages.push(current);
+  return messages;
+}

src/all_fonts_interaction_test.ts

@@ -0,0 +1,37 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import type { Interaction } from "discord.js";
+import interactionCreate from "./listener/interaction_create.ts";
+import { formatAllFonts } from "./all_fonts.ts";
+
+test("slash command acknowledges first and posts every chunk without mentions", async () => {
+  const calls: { method: string; payload?: any }[] = [];
+  const text = "A".repeat(200);
+  const interaction = {
+    isChatInputCommand: () => true,
+    commandName: "fontify-all",
+    options: { getString: () => text },
+    deferReply: async () => { calls.push({ method: "defer" }); },
+    editReply: async (payload: any) => { calls.push({ method: "edit", payload }); },
+    followUp: async (payload: any) => { calls.push({ method: "follow", payload }); },
+  } as unknown as Interaction;
+  await interactionCreate(interaction);
+  assert.equal(calls[0].method, "defer");
+  assert.equal(calls[1].method, "edit");
+  assert.deepEqual(calls.slice(1).map((c) => c.payload.content), formatAllFonts(text));
+  assert.ok(calls.slice(2).every((c) => c.method === "follow"));
+  for (const call of calls.slice(1)) assert.deepEqual(call.payload.allowedMentions, { parse: [] });
+});
+
+test("blank input produces only a private validation reply", async () => {
+  const calls: any[] = [];
+  const interaction = {
+    isChatInputCommand: () => true,
+    commandName: "fontify-all",
+    options: { getString: () => "   " },
+    reply: async (payload: any) => { calls.push(payload); },
+  } as unknown as Interaction;
+  await interactionCreate(interaction);
+  assert.equal(calls.length, 1);
+  assert.equal(calls[0].ephemeral, true);
+});

src/all_fonts_test.ts

@@ -0,0 +1,47 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import { formatAllFonts } from "./all_fonts.ts";
+import list from "./fontlist.ts";
+import { translateText } from "./translation.ts";
+import commands from "./context_commands.ts";
+
+test("all fonts appear exactly once, in catalogue order, with converted text", () => {
+  const text = "Hello 123 日本語 😀";
+  const output = formatAllFonts(text).join("\n\n");
+  assert.equal(output, list.map(({ label, font }) =>
+    `**${label}**\n\`\`\`\n${translateText(text, font)}\n\`\`\``
+  ).join("\n\n"));
+});
+
+test("long input is split into bounded messages without dropping any font", () => {
+  const messages = formatAllFonts("A".repeat(200));
+  assert.ok(messages.length > 1);
+  assert.ok(messages.every((message) => message.length <= 2_000));
+  for (const { label, font } of list) {
+    assert.equal(messages.filter((m) => m.includes(`**${label}**\n`)).length, 1);
+    assert.ok(messages.some((m) => m.includes(translateText("A".repeat(200), font))));
+  }
+});
+
+test("code fences are escaped and emoji stay intact", () => {
+  const messages = formatAllFonts("```😀".repeat(40));
+  for (const message of messages) {
+    assert.ok(message.length <= 2_000);
+    assert.ok(message.includes("``\u200b`😀"));
+    assert.ok(!message.includes("\uFFFD"));
+  }
+});
+
+test("reject invalid input", () => {
+  for (const text of ["", " \n\t", "a".repeat(201)]) {
+    assert.throws(() => formatAllFonts(text), RangeError);
+  }
+});
+
+test("registration preserves Fontify and adds the bounded slash command", () => {
+  const definitions = commands.map((command) => command.toJSON());
+  assert.deepEqual(definitions.map((c) => c.name), ["Fontify", "fontify-all"]);
+  const slash = definitions[1];
+  assert.equal(slash.type, 1);
+  assert.equal(slash.options?.[0].name, "text");
+});

src/context_commands.ts

@@ -1,7 +1,16 @@
-import { ApplicationCommandType, ContextMenuCommandBuilder } from "discord.js";
+import { ApplicationCommandType, ContextMenuCommandBuilder, SlashCommandBuilder } from "discord.js";
 
 export default [
   new ContextMenuCommandBuilder()
     .setName("Fontify")
     .setType(ApplicationCommandType.Message),
+  new SlashCommandBuilder()
+    .setName("fontify-all")
+    .setDescription("Show your text in every available font / 全書体をまとめて表示")
+    .addStringOption((option) => option
+      .setName("text")
+      .setDescription("Text to convert / 変換する文字列（200文字まで）")
+      .setRequired(true)
+      .setMinLength(1)
+      .setMaxLength(200)),
 ];

src/listener/interaction_create.ts

@@ -5,6 +5,7 @@ import fontSelectionComponent, {
 } from "../selection_component.ts";
 import list from "../fontlist.ts";
 import { formatTranslation, translateText } from "../translation.ts";
+import { ALL_FONTS_MAX_INPUT, formatAllFonts } from "../all_fonts.ts";
 
 const FONTIFY_COMMAND = "Fontify";
 
@@ -12,6 +13,24 @@ export default async function interactionCreate(
   interaction: Interaction<CacheType>,
 ): Promise<void> {
   try {
+    if (interaction.isChatInputCommand() && interaction.commandName === "fontify-all") {
+      const text = interaction.options.getString("text", true);
+      if (!text.trim() || text.length > ALL_FONTS_MAX_INPUT) {
+        await interaction.reply({
+          content: `空白以外の文字を含む${ALL_FONTS_MAX_INPUT}文字以内のテキストを指定してください。`,
+          ephemeral: true,
+        });
+        return;
+      }
+      await interaction.deferReply();
+      const messages = formatAllFonts(text);
+      await interaction.editReply({ content: messages[0], allowedMentions: { parse: [] } });
+      for (const content of messages.slice(1)) {
+        await interaction.followUp({ content, allowedMentions: { parse: [] } });
+      }
+      return;
+    }
+
     if (
       interaction.isMessageContextMenuCommand() &&
       interaction.commandName === FONTIFY_COMMAND