Add define command backed by dictionary API meanings

commands/define.js

@@ -0,0 +1,74 @@
+const { getMeanings } = require('../services/dictionary');
+
+const MAX_MEANINGS = 8;
+const MAX_DEFINITIONS_PER_MEANING = 3;
+const MAX_MESSAGE_LENGTH = 1900;
+
+function summarizeMeaning(meaning) {
+  const definitions = meaning.definitions.slice(0, MAX_DEFINITIONS_PER_MEANING);
+  if (!definitions.length)
+    return null;
+
+  const partOfSpeech = meaning.partOfSpeech ? `${meaning.partOfSpeech}: ` : '';
+  return `${partOfSpeech}${definitions.join(' | ')}`;
+}
+
+function buildMeaningsMessage(term, meanings) {
+  const summaries = meanings
+    .map(summarizeMeaning)
+    .filter(Boolean)
+    .slice(0, MAX_MEANINGS);
+
+  const lines = [`Meanings for **${term}**:`];
+  let added = 0;
+
+  for (let i = 0; i < summaries.length; i++) {
+    const candidateLine = `${i + 1}. ${summaries[i]}`;
+    const preview = `${lines.join('\n')}\n${candidateLine}`;
+
+    if (preview.length > MAX_MESSAGE_LENGTH)
+      break;
+
+    lines.push(candidateLine);
+    added++;
+  }
+
+  const hiddenCount = Math.max(0, summaries.length - added) + Math.max(0, meanings.length - MAX_MEANINGS);
+  if (hiddenCount > 0)
+    lines.push(`...and ${hiddenCount} more meaning(s).`);
+
+  return lines.join('\n');
+}
+
+async function defineCommand(message, args) {
+  const term = args.join(' ').trim();
+
+  if (!term) {
+    await message.channel.send(`Please provide a term. Example: \`${message.client.prefix}define bitcoin\``);
+    return;
+  }
+
+  let meanings;
+  try {
+    meanings = await getMeanings(term);
+  } catch {
+    await message.channel.send('Unable to fetch definitions right now. Please try again later.');
+    return;
+  }
+
+  if (meanings.length === 0) {
+    await message.channel.send(`No meanings found for **${term}**.`);
+    return;
+  }
+
+  await message.channel.send(buildMeaningsMessage(term, meanings));
+}
+
+module.exports = {
+  define: {
+    execute: defineCommand
+  },
+  def: {
+    execute: defineCommand
+  }
+};

services/dictionary.js

@@ -0,0 +1,42 @@
+const axios = require('axios');
+
+const DICTIONARY_API_URL = 'https://api.dictionaryapi.dev/api/v2/entries/en/';
+
+function normalizeMeaning(meaning) {
+  const partOfSpeech = String(meaning?.partOfSpeech || '').trim();
+  const definitions = Array.isArray(meaning?.definitions)
+    ? meaning.definitions
+      .map(definition => String(definition?.definition || '').trim())
+      .filter(Boolean)
+    : [];
+
+  return {
+    partOfSpeech,
+    definitions
+  };
+}
+
+async function getMeanings(term) {
+  const normalizedTerm = String(term || '').trim();
+  if (!normalizedTerm)
+    return [];
+
+  try {
+    const response = await axios.get(`${DICTIONARY_API_URL}${encodeURIComponent(normalizedTerm)}`);
+    const entries = Array.isArray(response.data) ? response.data : [];
+
+    return entries
+      .flatMap(entry => Array.isArray(entry?.meanings) ? entry.meanings : [])
+      .map(normalizeMeaning)
+      .filter(meaning => meaning.definitions.length > 0);
+  } catch (error) {
+    if (error.response?.status === 404)
+      return [];
+
+    throw new Error('Failed to fetch meanings.');
+  }
+}
+
+module.exports = {
+  getMeanings
+};