Function isMarimoContent

packages/convert/src/format-detection.ts:6–50

(content: string)

/** Check if file content is Marimo format */
export function isMarimoContent(content: string): boolean {
  // Marimo notebooks have a marimo import at the file level and @app.cell decorators
  // Skip shebangs, encoding comments, and module docstrings to find the first significant line
  const lines = content.split('\n')
  let inDocstring = false
  let docstringQuote = ''

  const firstSignificant = lines.find(line => {
    const t = line.trim()
    if (t.length === 0) {
      return false
    }
    if (t.startsWith('#!') || /^#\s*(-\*-\s*)?(coding|encoding)[:=]/i.test(t)) {
      return false
    }

    // Track module docstring (similar to isPercentContent)
    for (const q of ['"""', "'''"]) {
      if (!inDocstring && t.startsWith(q)) {
        // Check for single-line docstring (starts and ends with same quote)
        if (t.length > 3 && t.endsWith(q)) {
          // Single-line docstring, skip this line entirely
          return false
        }
        inDocstring = true
        docstringQuote = q
        return false
      }
      if (inDocstring && docstringQuote === q && t.includes(q)) {
        inDocstring = false
        return false
      }
    }
    if (inDocstring) {
      return false
    }
    return true
  })

  // Accept both 'import marimo' and 'from marimo import ...'
  const firstLine = firstSignificant ?? ''
  const isMarimoImport = /^import\s+marimo\b/.test(firstLine) || /^from\s+marimo\s+import\b/.test(firstLine)

  return isMarimoImport && /@app\.cell\b/.test(content)
}

/** Check if file content is percent format */
export function isPercentContent(content: string): boolean {