Function suggestShortcodeFromFilename

desktop/src/shared/api/customEmoji.ts:62–73

(filename: string)

 * runs of invalid characters into a single underscore.
 */
export function suggestShortcodeFromFilename(filename: string): string | null {
  const basename = filename
    .trim()
    .replace(/^.*[/\\]/, "")
    .replace(/\.[^.]*$/, "");
  const suggested = basename
    .toLowerCase()
    .replace(/[^a-z0-9_-]+/g, "_")
    .replace(/_+/g, "_")
    .replace(/^[_-]+|[_-]+$/g, "");
  return normalizeShortcode(suggested);
}

/**
 * Parse NIP-30 `["emoji", shortcode, url]` tags from a single event into a