Add script to symlink to local early-access repo

.gitignore

@@ -4,9 +4,9 @@
 /node_modules/
 npm-debug.log
 coverage/
-/assets/images/early-access/
-/content/early-access/
-/data/early-access/
+/assets/images/early-access
+/content/early-access
+/data/early-access
 
 # blc: broken link checker
 blc_output.log

script/early-access/symlink-from-local-repo.js

@@ -0,0 +1,78 @@
+#!/usr/bin/env node
+
+// [start-readme]
+//
+// This script is run on a writer's machine while developing Early Access content locally.
+// You must pass the script the location of your local copy of
+// the `github/docs-early-access` git repo as the first argument.
+//
+// [end-readme]
+
+const { execSync } = require('child_process')
+const rimraf = require('rimraf').sync
+const fs = require('fs')
+const path = require('path')
+
+// Early Access details
+const earlyAccessDirName = 'early-access'
+
+if (!process.argv[2]) {
+  throw new Error('Must provide the location of your local `docs-early-access` repo directory')
+}
+
+const earlyAccessLocalRepoDir = path.resolve(process.cwd(), process.argv[2])
+
+let dirStats
+try {
+  dirStats = fs.statSync(earlyAccessLocalRepoDir)
+} catch (err) {
+  dirStats = null
+}
+
+if (!dirStats) {
+  throw new Error('The local `docs-early-access` repo directory does not exist:', earlyAccessLocalRepoDir)
+}
+if (dirStats && !dirStats.isDirectory()) {
+  throw new Error('A non-directory entry exists at the local `docs-early-access` repo directory location:', earlyAccessLocalRepoDir)
+}
+
+const destinationDirNames = ['content', 'data', 'assets/images']
+const destinationDirsMap = destinationDirNames
+  .reduce(
+    (map, dirName) => {
+      map[dirName] = path.join(process.cwd(), dirName, earlyAccessDirName)
+      return map
+    },
+    {}
+  )
+
+// Remove all existing early access directories from this repo
+destinationDirNames.forEach(key => rimraf(destinationDirsMap[key]))
+
+// Move the latest early access source directories into this repo
+destinationDirNames.forEach((dirName) => {
+  const sourceDir = path.join(earlyAccessLocalRepoDir, dirName)
+  const destDir = destinationDirsMap[dirName]
+
+  // If the source directory doesn't exist, skip it
+  if (!fs.existsSync(sourceDir)) {
+    console.warn(`Early access directory '${dirName}' does not exist. Skipping...`)
+    return
+  }
+
+  // Create a symbolic link to the directory
+  fs.symlinkSync(sourceDir, destDir, 'junction')
+
+  // Confirm the newly moved directory exist
+  if (!fs.existsSync(destDir)) {
+    throw new Error(`Failed to symlink early access directory '${dirName}'!`)
+  }
+  if (!fs.lstatSync(destDir).isSymbolicLink()) {
+    throw new Error(`The early access directory '${dirName}' entry is not a symbolic link!`)
+  }
+  if (!fs.statSync(destDir).isDirectory()) {
+    throw new Error(`The early access directory '${dirName}' entry's symbolic link does not refer to a directory!`)
+  }
+
+  console.log(`Successfully symlinked early access directory '${dirName}' into this repo`)
+})