Function parseFrontmatter

src/main/import/notes/obsidian.ts:45–100

(content: string)

}

function parseFrontmatter(content: string): {
  content: string
  ignoredKeys: string[]
  invalid: boolean
  tags: string[]
} {
  const match = content.match(
    /^---\r?\n([\s\S]*?)\r?\n---(?:\r?\n|$)([\s\S]*)$/,
  )
  if (!match) {
    return { content, ignoredKeys: [], invalid: false, tags: [] }
  }

  let parsed: unknown
  try {
    parsed = yaml.load(match[1])
  }
  catch {
    return { content, ignoredKeys: [], invalid: true, tags: [] }
  }

  if (!parsed || typeof parsed !== 'object') {
    return {
      content: match[2] ?? '',
      ignoredKeys: [],
      invalid: false,
      tags: [],
    }
  }

  const frontmatter = parsed as Record<string, unknown>
  const ignoredKeys = Object.keys(frontmatter).filter(key => key !== 'tags')
  const tags = frontmatter.tags
  if (typeof tags === 'string') {
    return {
      content: match[2] ?? '',
      ignoredKeys,
      invalid: false,
      tags: tags
        .split(/[,\s]+/)
        .map(normalizeImportTag)
        .filter((tag): tag is string => !!tag),
    }
  }

  if (Array.isArray(tags)) {
    return {
      content: match[2] ?? '',
      ignoredKeys,
      invalid: false,
      tags: tags.map(normalizeImportTag).filter((tag): tag is string => !!tag),
    }
  }

  return { content: match[2] ?? '', ignoredKeys, invalid: false, tags: [] }
}

function isImportableTag(tag: string): boolean {