gatsby-plugin-lunr

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gatsby-plugin-lunr

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Gatsby plugin for full text search implementation based on lunr client-side index. Supports multilanguage search.

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# Search Plugin for Gatsby

Gatsby plugin for full text search implementation based on Lunr.js client-side index. It supports multilanguage search. Search index is placed into the /public folder during build time and has to be downloaded on client side on run time.

## Getting Started

Install `gatsby-plugin-lunr`

```
    npm install --save gatsby-plugin-lunr
```

```
    yarn add gatsby-plugin-lunr
```

Add `gatsby-plugin-lunr` configuration to the `gatsby-config.js` as following:

```javascript
module.exports = {
    plugins: [
        {
            resolve: `gatsby-plugin-lunr`,
            options: {
                languages: [
                    {
                        // ISO 639-1 language codes. See https://lunrjs.com/guides/language_support.html for details
                        name: 'en',
                        // A function for filtering nodes. () => true by default
                        filterNodes: node => node.frontmatter.lang === 'en',
                        // Add to index custom entries, that are not actually extracted from gatsby nodes
                        customEntries: [{ title: 'Pictures', content: 'awesome pictures', url: '/pictures' }],
                    },
                    {
                        name: 'fr',
                        filterNodes: node => node.frontmatter.lang === 'fr',
                    },
                ],
                // Fields to index. If store === true value will be stored in index file.
                // Attributes for custom indexing logic. See https://lunrjs.com/docs/lunr.Builder.html for details
                fields: [
                    { name: 'title', store: true, attributes: { boost: 20 } },
                    { name: 'content' },
                    { name: 'url', store: true },
                ],
                // How to resolve each field's value for a supported node type
                resolvers: {
                    // For any node of type MarkdownRemark, list how to resolve the fields' values
                    MarkdownRemark: {
                        title: node => node.frontmatter.title,
                        content: node => node.rawMarkdownBody,
                        url: node => node.fields.url,
                    },
                },
                //custom index file name, default is search_index.json
                filename: 'search_index.json',
                //custom options on fetch api call for search_ındex.json
                fetchOptions: {
                    credentials: 'same-origin'
                },
            },
        },
    ],
}
```

### Using plugins
```javascript
const myPlugin = (lunr) => (builder) => {
  // removing stemmer
  builder.pipeline.remove(lunr.stemmer)
  builder.searchPipeline.remove(lunr.stemmer)
  // or similarity tuning
  builder.k1(1.3)
  builder.b(0)
}
```
Pass it to the `gatsby-config.js`:
...
languages: [
            {
             name: 'en',
             ...
             plugins: [myPlugin]
            }
           ]
...

## Implementing Search in Your Web UI using Functional Components

The search data will be available on the client side via `window.__LUNR__` that is an object with the following fields:

-   `index` - a lunr index instance
-   `store` - object where the key is a gatsby node ID and value is a collection of field values.

```javascript
import React, { useState, useEffect } from 'react'
import { Link } from 'gatsby'

const Search = () => {
  const [query, setQuery] = useState(``)
  const [results, setResults] = useState([])

useEffect(
    () => {
      if (!query || !window.__LUNR__) {
        setResults([])
        return
      }
      const lunrIndex = window.__LUNR__['en']
      const searchResults = lunrIndex.index.search(query)
      setResults(
        searchResults.map(({ ref }) => {
          return lunrIndex.store[ref]
        })
      )
    },
    [query]
  )

return (
    <div>
      <input
        type='text'
        defaultValue={query}
        onChange={event => {
          setQuery(event.target.value)
        }}
      />
      <ul>
        {results.map(({ url, title }) => {
          return (
            <li key={url}>
              <Link to={url}>{title}</Link>
            </li>
          )
        })}
      </ul>
    </div>
  )
}

export default Search
```

## Implementing Search in Your Web UI using Class Components

The search data will be available on the client side via `window.__LUNR__` that is an object with the following fields:

-   `index` - a lunr index instance
-   `store` - object where the key is a gatsby node ID and value is a collection of field values.

```javascript
import React, { Component } from 'react'

// Search component
export default class Search extends Component {
    constructor(props) {
        super(props)
        this.state = {
            query: ``,
            results: [],
        }
    }

render() {
        return (
            <div>
                <input type="text" value={this.state.query} onChange={this.search} />
                <ul>{this.state.results.map(page => <li>{page.title}</li>)}</ul>
            </div>
        )
    }

getSearchResults(query) {
        if (!query || !window.__LUNR__) return []
        const lunrIndex =  window.__LUNR__[this.props.lng];
        const results = lunrIndex.index.search(query) // you can  customize your search , see https://lunrjs.com/guides/searching.html
        return results.map(({ ref }) => lunrIndex.store[ref])
    }

search = event => {
        const query = event.target.value
        const results = this.getSearchResults(query)
        this.setState(s => {
            return {
                results,
                query,
            }
        })
    }
}
```

Sample code and example on implementing search within gatsby starter project could be found in the article at: https://medium.com/humanseelabs/gatsby-v2-with-a-multi-language-search-plugin-ffc5e04f73bc

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