')\n .replace(/\\n/g, '
')\n .replace(/^/, '

')\n .replace(/$/, '

');\n}\n\n/**\n * Decode HTML entities to their corresponding characters\n */\nexport function decodeHTMLEntities(text: string): string {\n // Common HTML entities mapping\n const entities: { [key: string]: string } = {\n '&': '&',\n '<': '<',\n '>': '>',\n '"': '\"',\n ''': \"'\",\n ''': \"'\",\n ''': \"'\",\n ' ': ' ',\n '©': '\\u00A9',\n '®': '\\u00AE',\n '™': '\\u2122',\n '…': '\\u2026',\n '—': '\\u2014',\n '–': '\\u2013',\n '‘': '\\u2018',\n '’': '\\u2019',\n '“': '\\u201C',\n '”': '\\u201D'\n };\n\n // Replace named entities\n let decoded = text;\n for (const [entity, char] of Object.entries(entities)) {\n decoded = decoded.replace(new RegExp(entity, 'g'), char);\n }\n\n // Replace numeric entities ({ and )\n decoded = decoded.replace(/&#(\\d+);/g, (match, num) => {\n return String.fromCharCode(parseInt(num, 10));\n });\n \n decoded = decoded.replace(/&#x([0-9a-fA-F]+);/g, (match, hex) => {\n return String.fromCharCode(parseInt(hex, 16));\n });\n\n return decoded;\n}\n\n/**\n * Truncate HTML content for descriptions\n */\nexport function truncateHTML(html: string, maxLength: number = 200): string {\n // Strip HTML tags for truncation measurement, but preserve spaces\n let text = html.replace(/<[^>]*>/g, ' ').replace(/\\s+/g, ' ').trim();\n \n // Decode HTML entities to get the actual text content\n text = decodeHTMLEntities(text);\n \n if (text.length <= maxLength) return text;\n \n return text.substring(0, maxLength).trim() + '...';\n}\n\n/**\n * Format date for RSS\n */\nexport function formatRSSDate(date: Date): string {\n return date.toUTCString();\n}\n\n/**\n * Format date for ActivityPub\n */\nexport function formatActivityPubDate(date: Date): string {\n return date.toISOString();\n}\n\n/**\n * Count graphemes (user-perceived characters) in a string\n * This is important for AT Protocol which has grapheme limits, not character limits\n */\nexport function countGraphemes(text: string): number {\n // Use Intl.Segmenter if available (modern browsers/Deno)\n if (typeof Intl !== 'undefined' && Intl.Segmenter) {\n const segmenter = new Intl.Segmenter('en', { granularity: 'grapheme' });\n return Array.from(segmenter.segment(text)).length;\n }\n \n // Fallback: approximate grapheme count\n // This handles most common cases but isn't perfect for all Unicode\n return Array.from(text).length;\n}\n\n/**\n * Truncate text to a specific grapheme count\n */\nexport function truncateToGraphemes(text: string, maxGraphemes: number): string {\n if (countGraphemes(text) <= maxGraphemes) {\n return text;\n }\n \n // Use Intl.Segmenter if available for precise truncation\n if (typeof Intl !== 'undefined' && Intl.Segmenter) {\n const segmenter = new Intl.Segmenter('en', { granularity: 'grapheme' });\n const segments = Array.from(segmenter.segment(text));\n \n if (segments.length <= maxGraphemes) {\n return text;\n }\n \n // Take maxGraphemes - 3 to leave room for \"...\"\n const truncateAt = Math.max(0, maxGraphemes - 3);\n const truncated = segments.slice(0, truncateAt).map(s => s.segment).join('');\n return truncated + '...';\n }\n \n // Fallback truncation\n const chars = Array.from(text);\n if (chars.length <= maxGraphemes) {\n return text;\n }\n \n const truncateAt = Math.max(0, maxGraphemes - 3);\n return chars.slice(0, truncateAt).join('') + '...';\n}\n\n/**\n * Create AT Protocol post content with proper grapheme limits\n */\nexport function createATProtoPostContent(title: string, content: string, postUrl: string, maxGraphemes: number = 300): string {\n const prefix = \"📝 New blog post: \";\n const suffix = `\\n\\nRead more: ${postUrl}`;\n \n // Calculate available space for title and content\n const fixedLength = countGraphemes(prefix) + countGraphemes(suffix);\n const availableForContent = maxGraphemes - fixedLength;\n \n if (availableForContent <= 0) {\n // If URL and prefix take up too much space, create minimal post\n const minimalPost = `📝 ${title}`;\n return truncateToGraphemes(minimalPost, maxGraphemes);\n }\n \n // Try to fit title + some content\n const titleWithPrefix = prefix + title;\n const titleLength = countGraphemes(titleWithPrefix);\n \n if (titleLength >= availableForContent) {\n // Title is too long, truncate it\n const maxTitleLength = availableForContent - 3; // Leave room for \"...\"\n const truncatedTitle = truncateToGraphemes(title, maxTitleLength);\n return truncateToGraphemes(prefix + truncatedTitle + suffix, maxGraphemes);\n }\n \n // Calculate space left for content preview\n const spaceForContent = availableForContent - titleLength - 2; // 2 for \"\\n\\n\"\n \n if (spaceForContent > 10) { // Only add content if we have reasonable space\n const contentPreview = truncateHTML(content, spaceForContent);\n const fullPost = `${titleWithPrefix}\\n\\n${contentPreview}${suffix}`;\n return truncateToGraphemes(fullPost, maxGraphemes);\n } else {\n // Not enough space for content, just title and URL\n const fullPost = `${titleWithPrefix}${suffix}`;\n return truncateToGraphemes(fullPost, maxGraphemes);\n }\n}\n\n/**\n * Check if we're running in development mode\n * Development mode is enabled when:\n * 1. NODE_ENV is set to 'development', OR\n * 2. DEV_MODE is set to 'true', OR\n * 3. ENABLE_TEST_ENDPOINTS is set to 'true'\n */\nexport function isDevelopmentMode(): boolean {\n // Check if we're in a browser environment (shared code)\n if (typeof Deno === 'undefined') {\n return false; // Default to production in browser\n }\n \n const nodeEnv = Deno.env.get('NODE_ENV')?.toLowerCase();\n const devMode = Deno.env.get('DEV_MODE')?.toLowerCase();\n const enableTests = Deno.env.get('ENABLE_TEST_ENDPOINTS')?.toLowerCase();\n \n return nodeEnv === 'development' || \n devMode === 'true' || \n enableTests === 'true';\n}\n\n/**\n * Create a development-only response wrapper\n * Returns 404 in production, executes handler in development\n */\nexport function devOnly(handler: () => T | Promise): T | Promise {\n if (!isDevelopmentMode()) {\n return new Response('Not Found', { \n status: 404,\n headers: { 'Content-Type': 'text/plain' }\n }) as any;\n }\n \n return handler();\n}","deleted","label",[170,153],"shared","permalink","https://www.val.town/x/humble/postherous/code/shared/utils.ts","extension","actionData","errors"]