indexx.dev
forked from
j4ck.xyz/tweets2bsky
A simple tool which lets you scrape twitter accounts and crosspost them to bluesky accounts! Comes with a CLI and a webapp for managing profiles! Works with images/videos/link embeds/threads.
chore: shorten alt text prompt
+28
-12
src/ai-manager.ts
+28
-12
src/ai-manager.ts
···
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}
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try {
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const prompt = buildAltTextPrompt(contextText);
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switch (provider) {
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case 'gemini':
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// apiKey is guaranteed by check above
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return await callGemini(apiKey!, model || 'models/gemini-2.5-flash', buffer, mimeType, contextText);
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return await callGemini(apiKey!, model || 'models/gemini-2.5-flash', buffer, mimeType, prompt);
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case 'openai':
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case 'custom':
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return await callOpenAICompatible(apiKey, model || 'gpt-4o', baseUrl, buffer, mimeType, contextText);
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return await callOpenAICompatible(apiKey, model || 'gpt-4o', baseUrl, buffer, mimeType, prompt);
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case 'anthropic':
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// apiKey is guaranteed by check above
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return await callAnthropic(
···
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baseUrl,
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buffer,
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mimeType,
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contextText,
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prompt,
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);
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default:
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console.warn(`[AI] ⚠️ Unknown provider: ${provider}`);
···
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}
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}
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const ALT_TEXT_CONTEXT_MAX_CHARS = 400;
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function buildAltTextPrompt(contextText: string): string {
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const normalized = contextText.replace(/\s+/g, ' ').trim();
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const trimmed =
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normalized.length > ALT_TEXT_CONTEXT_MAX_CHARS
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? `${normalized.slice(0, ALT_TEXT_CONTEXT_MAX_CHARS).trim()}...`
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: normalized;
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+
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return [
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'Write alt text (1-2 sentences).',
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'Describe only what is visible.',
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'Use context to identify people/places/objects if relevant.',
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'Include key names for search.',
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'No hashtags or emojis.',
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`Context: "${trimmed}"`,
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].join(' ');
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}
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+
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async function callGemini(
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apiKey: string,
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modelName: string,
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buffer: Buffer,
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mimeType: string,
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contextText: string,
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prompt: string,
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): Promise<string | undefined> {
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const genAI = new GoogleGenerativeAI(apiKey);
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const model = genAI.getGenerativeModel({ model: modelName });
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const prompt = `Describe this image for alt text. Be concise but descriptive.
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Context from the tweet text: "${contextText}".
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Use the context to identify specific people, objects, or context mentioned, but describe what is visually present in the image.`;
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const result = await model.generateContent([
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prompt,
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{
···
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baseUrl: string | undefined,
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buffer: Buffer,
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mimeType: string,
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contextText: string,
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prompt: string,
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): Promise<string | undefined> {
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const url = baseUrl
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? `${baseUrl.replace(/\/+$/, '')}/chat/completions`
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content: [
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{
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type: 'text',
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text: `Describe this image for alt text. Be concise but descriptive. Context from the tweet text: "${contextText}".`,
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text: prompt,
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},
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{
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type: 'image_url',
···
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baseUrl: string | undefined,
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buffer: Buffer,
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mimeType: string,
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contextText: string,
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prompt: string,
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): Promise<string | undefined> {
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const url = baseUrl ? `${baseUrl.replace(/\/+$/, '')}/v1/messages` : 'https://api.anthropic.com/v1/messages';
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···
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},
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{
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type: 'text',
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text: `Describe this image for alt text. Be concise but descriptive. Context from the tweet text: "${contextText}".`,
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text: prompt,
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},
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],
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},