Use GitHub Pages site origin for setting up SSG configs

src/set-pages-config.js

@@ -0,0 +1,85 @@
+const core = require('@actions/core')
+const { ConfigParser } = require('./config-parser')
+const removeTrailingSlash = require('./remove-trailing-slash')
+
+// Return the settings to be passed to a {ConfigParser} for a given static site generator,
+// optional configuration file path, and a Pages siteUrl value to inject
+function getConfigParserSettings({ staticSiteGenerator, generatorConfigFile, siteUrl }) {
+  let { pathname, origin } = siteUrl
+
+  switch (staticSiteGenerator) {
+    case 'nuxt':
+      return {
+        configurationFile: generatorConfigFile || './nuxt.config.js',
+        blankConfigurationFile: `${__dirname}/blank-configurations/nuxt.js`,
+        properties: {
+          // Configure a base path on the router
+          'router.base': pathname,
+
+          // Set the target to static too
+          // https://nuxtjs.org/docs/configuration-glossary/configuration-target/
+          target: 'static'
+        }
+      }
+    case 'next':
+      // Next does not want a trailing slash
+      pathname = removeTrailingSlash(pathname)
+
+      return {
+        configurationFile: generatorConfigFile || './next.config.js',
+        blankConfigurationFile: `${__dirname}/blank-configurations/next.js`,
+        properties: {
+          // Configure a base path
+          basePath: pathname,
+
+          // Disable server side image optimization too
+          // https://nextjs.org/docs/api-reference/next/image#unoptimized
+          'experimental.images.unoptimized': true
+        }
+      }
+    case 'gatsby':
+      return {
+        configurationFile: generatorConfigFile || './gatsby-config.js',
+        blankConfigurationFile: `${__dirname}/blank-configurations/gatsby.js`,
+        properties: {
+          // Configure a path prefix
+          pathPrefix: pathname,
+          // Configure a site url
+          'siteMetadata.siteUrl': origin
+        }
+      }
+    case 'sveltekit':
+      // SvelteKit does not want a trailing slash
+      pathname = removeTrailingSlash(pathname)
+
+      return {
+        configurationFile: generatorConfigFile || './svelte.config.js',
+        blankConfigurationFile: `${__dirname}/blank-configurations/sveltekit.js`,
+        properties: {
+          // Configure a base path
+          'kit.paths.base': pathname,
+          // Configure a prerender origin
+          'kit.prerender.origin': origin
+        }
+      }
+    default:
+      throw `Unsupported static site generator: ${staticSiteGenerator}`
+  }
+}
+
+// Inject Pages configuration in a given static site generator's configuration file
+function setPagesConfig({ staticSiteGenerator, generatorConfigFile, siteUrl }) {
+  try {
+    // Parse the configuration file and try to inject the Pages configuration in it
+    const settings = getConfigParserSettings({ staticSiteGenerator, generatorConfigFile, siteUrl })
+    new ConfigParser(settings).injectAll()
+  } catch (error) {
+    // Logging
+    core.warning(
+      `We were unable to determine how to inject the site metadata into your config. Generated URLs may be incorrect. The base URL for this site should be ${path}. Please ensure your framework is configured to generate relative links appropriately.`,
+      error
+    )
+  }
+}
+
+module.exports = { getConfigParserSettings, setPagesConfig }