text: import React from "react"
  import { Link, graphql } from "gatsby"
  
  import Layout from "../components/layout"
  import SEO from "../components/seo"
  import TagList from "../components/taglist"
  import { rhythm, scale } from "../utils/typography"
  
  const BlogPostTemplate = ({ data, pageContext, location }) => {
    const post = data.markdownRemark
    const siteTitle = data.site.siteMetadata.title
    const { previous, next } = pageContext
  
    return (
      <Layout location={location} title={siteTitle}>
        <SEO
          title={post.frontmatter.title}
          description={post.excerpt}
        />
        <article>
          <header>
            <h1
              style={{
                marginTop: rhythm(1),
                marginBottom: 0,
              }}
            >
              {post.frontmatter.title}
            </h1>
            <p
              style={{
                ...scale(-1 / 5),
                display: `block`,
                marginBottom: rhythm(1),
              }}
            >
              {post.frontmatter.date}
              {post.frontmatter.tags &&
               <TagList tags={post.frontmatter.tags} />}
            </p>
          </header>
          <section dangerouslySetInnerHTML={{ __html: post.html }} />
          <hr
            style={{
              marginBottom: rhythm(1),
            }}
          />
          <footer>
          </footer>
        </article>
  
        <nav>
          <ul
            style={{
              display: `flex`,
              flexWrap: `wrap`,
              justifyContent: `space-between`,
              listStyle: `none`,
              padding: 0,
            }}
          >
            <li>
              {previous && (
                <Link to={previous.fields.slug} rel="prev">
                  ← {previous.frontmatter.title}
                </Link>
              )}
            </li>
            <li>
              {next && (
                <Link to={next.fields.slug} rel="next">
                  {next.frontmatter.title} →
                </Link>
              )}
            </li>
          </ul>
        </nav>
      </Layout>
    )
  }
  
  export default BlogPostTemplate
  
  export const pageQuery = graphql`
    query BlogPostBySlug($slug: String!) {
      site {
        siteMetadata {
          title
        }
      }
      markdownRemark(fields: { slug: { eq: $slug } }) {
        id
        excerpt(pruneLength: 160)
        html
        frontmatter {
          title
          date
          tags
        }
      }
    }
  `
  