configure-pages/src/set-pages-path.js

const core = require('@actions/core')
const {ConfigParser} = require('./config-parser')

// Return the settings to be passed to a {ConfigParser} for a given
// static site generator and a Pages path value to inject
function getConfigParserSettings(staticSiteGenerator, path) {
  switch (staticSiteGenerator) {
    case 'nuxt':
      return {
        configurationFile: './nuxt.config.js',
        propertyName: 'router.base',
        propertyValue: path,
        blankConfigurationFile: `${__dirname}/blank-configurations/nuxt.js`
      }
    case 'next':
      return {
        configurationFile: './next.config.js',
        propertyName: 'basePath',
        propertyValue: path,
        blankConfigurationFile: `${__dirname}/blank-configurations/next.js`
      }
    case 'gatsby':
      return {
        configurationFile: './gatsby-config.js',
        propertyName: 'pathPrefix',
        propertyValue: path,
        blankConfigurationFile: `${__dirname}/blank-configurations/gatsby.js`
      }
    default:
      throw `Unsupported static site generator: ${staticSiteGenerator}`
  }
}

// Inject Pages configuration in a given static site generator's configuration file
function setPagesPath({staticSiteGenerator, path}) {
  try {
    // Parse the configuration file and try to inject the Pages configuration in it
    new ConfigParser(
      getConfigParserSettings(staticSiteGenerator, path)
    ).inject()
  } 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, setPagesPath}