gatsby-plugin-feed: enable function values for title, output, and link?

[johnridesabike]

Summary

I propose that gatsby-plugin-feed be able to accept functions for title, output, and link. Each of these functions would accept the result of the query value and return a string.

Basic example

Compared to the current example configuration:

// In your gatsby-config.js
module.exports = {
  plugins: [
    {
      resolve: `gatsby-plugin-feed`,
      options: {
        query: `
          {
            site {
              siteMetadata {
                title
                description
                siteUrl
+                feedTitle
+                feedOutput
+                feedLink
              }
            }
          }
        `,
        feeds: [
          {
            serialize:  serializeCallback,
            query: queryString,
-            output: "/rss.xml",
+            output: ({ query: { site: { feedOutput } } }) => feedOutput,
-            title: "Your Site's RSS Feed",
+            title: ({ query: { site: { feedTitle } } }) => feedTitle,
            match: "^/blog/",
-            link: "https://feeds.feedburner.com/gatsby/blog",
+            link: ({ query: { site: { feedLink } } }) => feedLink,
          },
        ],
      },
    },
  ],
}

Motivation

This allows these values to be configured through the same GraphQL API that the rest of the data is in. You can store these values in JSON, YAML, or some other queryable source instead of editing gatsby-config.js. This will also make it easier to use with CMSes.

[LekoArts]

Sounds like a good idea! I also was in the need to customise the feed title in the past programmatically. Since we currently won't have time to implement this would you be interested in sending in a PR for this? Let us know if you need guidance or pointers for the start.

[github-actions[bot]]

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[github-actions[bot]]

Hiya!

This issue has gone quiet. Spooky quiet. 👻

We get a lot of issues, so we currently close issues after 60 days of inactivity. It’s been at least 20 days since the last update here.
If we missed this issue or if you want to keep it open, please reply here.
As a friendly reminder: the best way to see this issue, or any other, fixed is to open a Pull Request. Check out gatsby.dev/contribute for more information about opening PRs, triaging issues, and contributing!

Thanks for being a part of the Gatsby community! 💪💜