laconic.com/src/lib/utils/blog.ts

import { render } from 'datocms-structured-text-to-plain-text'
import { BlogPostFragment } from 'lib/cms/generated'

export const getPlainTextContent = (post: BlogPostFragment) => {
  const children = post?.content?.value.document.children

  const filtered = children.filter((block: any) => block.type === 'paragraph')

  const textBlocks = []

  for (const block of filtered) {
    const paragraph = render(block)
    textBlocks.push(paragraph)
  }

  const text = textBlocks.join(' ')

  return text ?? ''
}

export const getDescription = (post: BlogPostFragment) => {
  let text = getPlainTextContent(post)

  const charLimit = 200
  text = text.substring(0, charLimit)
  let words = text.trim().split(/\s+/)
  words = words.splice(0, words.length - 1)
  const description = words.join(' ') + '...'
  return description
}

export const getSeoTags = (post: BlogPostFragment) => {
  const description = getDescription(post)

  const filteredMetaTags = post._seoMetaTags.filter((t) => {
    if (
      t.attributes?.name === 'description' ||
      t.attributes?.name === 'twitter:description' ||
      t.attributes?.property === 'og:description' ||
      t.tag === 'title'
    ) {
      return false
    }
    return true
  })

  return [
    ...filteredMetaTags,
    {
      content: post.title + ' | Akash Network',
      tag: 'title'
    },
    {
      attributes: {
        content: description,
        name: 'description'
      },
      content: null,
      tag: 'meta'
    },
    {
      attributes: {
        content: description,
        property: 'og:description'
      },
      content: null,
      tag: 'meta'
    },
    {
      attributes: {
        content: description,
        name: 'twitter:description'
      },
      content: null,
      tag: 'meta'
    }
  ]
}

export type BlogPostWithMeta = Omit<BlogPostFragment, 'content'> & {
  plainTextContent: string
  numId: number
}

export type SingleBlogPost = BlogPostFragment & {
  description: string
}