.

Author: wooorm

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.github/workflows/main.yml

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+name: main
+on:
+  - pull_request
+  - push
+jobs:
+  main:
+    name: ${{matrix.node}}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dcodeIO/setup-node-nvm@master
+        with:
+          node-version: ${{matrix.node}}
+      - run: npm install
+      - run: npm test
+      - uses: codecov/codecov-action@v1
+    strategy:
+      matrix:
+        node:
+          - lts/erbium
+          - node

.gitignore

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+.DS_Store
+*.log
+coverage/
+node_modules/
+yarn.lock

.npmrc

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+package-lock=false

.prettierignore

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+coverage/
+*.json
+*.md

example.mjs

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+import {rss} from './index.mjs'
+import toXml from 'xast-util-to-xml'
+
+var tree = rss(
+  {
+    title: 'NYT > Top Stories',
+    url: 'https://www.nytimes.com',
+    feedUrl: 'https://rss.nytimes.com/services/xml/rss/nyt/HomePage.xml',
+    lang: 'en',
+    author: 'The New York Times Company'
+  },
+  [
+    {
+      title: 'Senate Balances Impeachment Trial With an Incoming President',
+      url:
+        'https://www.nytimes.com/2021/01/14/us/politics/impeachment-senate-trial-trump.html',
+      description: 'Senate leaders etc etc etc.',
+      author: 'Nicholas Fandos and Catie Edmondson',
+      published: 'Fri, 15 Jan 2021 01:18:49 +0000',
+      tags: ['Senate', 'Murkowski, Lisa', 'Trump, Donald J']
+    }
+  ]
+)
+
+console.log(toXml(tree))

index.mjs

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+export {rss} from './lib/rss.mjs'
+export {atom} from './lib/atom.mjs'

lib/atom.mjs

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+import u from 'unist-builder'
+import x from 'xastscript'
+import bcp47 from 'bcp-47-normalize'
+import {toAuthor} from './util.mjs'
+
+export function atom(channel, data) {
+  var now = new Date()
+  var meta = channel || {}
+  var items = []
+  var index = -1
+  var offset
+  var children
+  var datum
+  var value
+
+  if (meta.title == null) throw new Error('Expected `channel.title` to be set')
+  if (meta.url == null) throw new Error('Expected `channel.url` to be set')
+
+  items.push(x('title', String(meta.title)))
+  items.push(x('subtitle', String(meta.description || '')))
+  value = new URL(meta.url).href
+  // `rel: 'alternate'` is the default.
+  items.push(x('link', value))
+  items.push(x('id', value))
+  items.push(x('updated', now.toGMTString()))
+
+  if (meta.feedUrl) {
+    items.push(
+      x('link', {
+        href: new URL(meta.feedUrl).href,
+        rel: 'self',
+        type: 'application/atom+xml'
+      })
+    )
+  }
+
+  if (meta.author) {
+    value = toAuthor(meta.author)
+    items.push(
+      x('rights', '© ' + now.getUTCFullYear() + ' ' + value.name),
+      createAuthor(value)
+    )
+  }
+
+  if (meta.tags) {
+    offset = -1
+    while (++offset < meta.tags.length) {
+      items.push(x('category', {term: String(meta.tags[offset])}))
+    }
+  }
+
+  if (data) {
+    while (++index < data.length) {
+      datum = data[index]
+      children = []
+
+      if (!datum.title && !datum.description && !datum.descriptionHtml) {
+        throw new Error(
+          'Expected either `title` or `description` to be set in entry `' +
+            index +
+            '`'
+        )
+      }
+
+      if (datum.title) children.push(x('title', String(datum.title)))
+
+      if (datum.author) {
+        children.push(createAuthor(toAuthor(datum.author)))
+      } else if (!meta.author) {
+        throw new Error(
+          'Expected `author` to be set in entry `' +
+            index +
+            '` or in the channel'
+        )
+      }
+
+      if (datum.url) {
+        value = new URL(datum.url).href
+        children.push(x('link', {href: value}))
+        children.push(x('id', value))
+      }
+
+      value = datum.published
+
+      if (value != null) {
+        if (typeof value !== 'object') value = new Date(value)
+        children.push(x('published', value.toISOString()))
+      }
+
+      value = datum.modified
+
+      if (value != null) {
+        if (typeof value !== 'object') value = new Date(value)
+        children.push(x('updated', value.toISOString()))
+      }
+
+      if (datum.tags) {
+        offset = -1
+        while (++offset < datum.tags.length) {
+          items.push(x('category', {term: String(datum.tags[offset])}))
+        }
+      }
+
+      value = datum.enclosure
+
+      if (value) {
+        if (!value.url) {
+          throw new Error(
+            'Expected either `enclosure.url` to be set in entry `' + index + '`'
+          )
+        }
+
+        if (!value.size) {
+          throw new Error(
+            'Expected either `enclosure.size` to be set in entry `' +
+              index +
+              '`'
+          )
+        }
+
+        if (!value.type) {
+          throw new Error(
+            'Expected either `enclosure.type` to be set in entry `' +
+              index +
+              '`'
+          )
+        }
+
+        // Can’t use `xastscript` because of `length`
+        children.push({
+          type: 'element',
+          name: 'link',
+          attributes: {
+            rel: 'enclosure',
+            href: new URL(value.url).href,
+            length: String(value.size),
+            type: value.type
+          },
+          children: []
+        })
+      }
+
+      if (datum.descriptionHtml || datum.description) {
+        children.push(
+          x(
+            'content',
+            // `type: "text"` is the default.
+            {type: datum.descriptionHtml ? 'html' : undefined},
+            String(datum.descriptionHtml || datum.description)
+          )
+        )
+      }
+
+      items.push(x('entry', children))
+    }
+  }
+
+  return u('root', [
+    u('instruction', {name: 'xml'}, 'version="1.0" encoding="utf-8"'),
+    x(
+      'feed',
+      {
+        xmlns: 'http://www.w3.org/2005/Atom',
+        'xml:lang': meta.lang ? bcp47(meta.lang) : undefined
+      },
+      items
+    )
+  ])
+}
+
+function createAuthor(value) {
+  return x('author', [
+    x('name', String(value.name)),
+    value.email ? x('email', String(value.email)) : undefined,
+    value.url ? x('uri', new URL(value.url).href) : undefined
+  ])
+}