text: import React from "react"
  import { Link, graphql } from "gatsby"
  
  import Bio from "../components/bio"
  import ToC from "../components/toc"
  import Layout from "../components/layout"
  import SEO from "../components/seo"
  import { rhythm } from "../utils/typography"
  
  class BlogPostTemplate extends React.Component {
    render() {
      const post = this.props.data.markdownRemark
      const siteTitle = this.props.data.site.siteMetadata.title
      const { previous, next } = this.props.pageContext
  
      return (
        <Layout location={this.props.location} title={siteTitle}>
          <SEO
            title={post.frontmatter.title}
            description={post.frontmatter.description || post.excerpt}
          />
          <h1
            style={{
              marginTop: rhythm(1),
              marginBottom: rhythm(1),
            }}
          >
            {post.frontmatter.title}
          </h1>
          <section>{post.frontmatter.description}</section>
          <ToC html={post.tableOfContents} />
          <article dangerouslySetInnerHTML={{ __html: post.html }} />
          <hr
            style={{
              marginBottom: rhythm(1),
            }}
          />
          <Bio />
  
          <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>
        </Layout>
      )
    }
  }
  
  export default BlogPostTemplate
  
  export const pageQuery = graphql`
    query BlogPostBySlug($slug: String!) {
      site {
        siteMetadata {
          title
          author
        }
      }
      markdownRemark(fields: { slug: { eq: $slug } }) {
        id
        tableOfContents
        excerpt(pruneLength: 160)
        html
        frontmatter {
          title
          description
        }
      }
    }
  `
  