vitepress: Centralize loading of local.js config file

Author: slusarz

lib/utility.js

@@ -10,7 +10,7 @@ import { fileURLToPath } from 'url';
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
 
-const local_conf = __dirname + '/../.vitepress/local.js'
+const local_conf_path = __dirname + '/../.vitepress/local.js'
 
 export function normalizeArrayData(data, keys) {
 	for (const [k, v] of Object.entries(data)) {
@@ -29,15 +29,26 @@ export function normalizeArrayData(data, keys) {
 	return data
 }
 
+let local_conf = null
+async function loadLocalConf() {
+	if (local_conf === null) {
+		if (fs.existsSync(local_conf_path)) {
+			local_conf = await import(local_conf_path)
+		} else {
+			local_conf = false
+		}
+	}
+
+	return local_conf
+}
+
 export async function loadData(id) {
 	let path = '../data/' + id + '.js'
 
 	/* Check for config override file. */
-	if (fs.existsSync(local_conf)) {
-		const data = await import(local_conf)
-		if (data.data_paths[id]) {
-			path = data.data_paths[id]
-		}
+	const lconf = await loadLocalConf()
+	if (lconf && lconf.data_paths[id]) {
+		path = lconf.data_paths[id]
 	}
 
 	try {
@@ -50,47 +61,39 @@ export async function loadData(id) {
 
 export async function sourceFiles() {
 	/* Check for config override file. */
-	if (fs.existsSync(local_conf)) {
-		const data = await import(local_conf)
-		if (data.source_paths) {
-			return data.source_paths
-		}
+	const lconf = await loadLocalConf()
+	if (lconf && lconf.source_paths) {
+		return lconf.source_paths
 	}
 
 	return [ 'docs/**/*.md' ]
 }
 
 export async function watchFiles() {
 	/* Check for config override file. */
-	if (fs.existsSync(local_conf)) {
-		const data = await import(local_conf)
-		if (data.watch_paths) {
-			return data.watch_paths
-		}
+	const lconf = await loadLocalConf()
+	if (lconf && lconf.watch_paths) {
+		return lconf.watch_paths
 	}
 
 	return [ 'docs/**/*.md', 'docs/**/*.inc', 'data/**/*' ]
 }
 
 export async function manFiles() {
 	/* Check for config override file. */
-	if (fs.existsSync(local_conf)) {
-		const data = await import(local_conf)
-		if (data.man_paths) {
-			return data.man_paths
-		}
+	const lconf = await loadLocalConf()
+	if (lconf && lconf.man_paths) {
+		return lconf.man_paths
 	}
 
 	return [ 'docs/core/man/*.[[:digit:]].md' ]
 }
 
 export async function pluginFiles() {
 	/* Check for config override file. */
-	if (fs.existsSync(local_conf)) {
-		const data = await import(local_conf)
-		if (data.plugin_paths) {
-			return data.plugin_paths
-		}
+	const lconf = await loadLocalConf()
+	if (lconf && lconf.plugin_paths) {
+		return lconf.plugin_paths
 	}
 
 	return [ 'docs/core/plugins/*.md' ]
@@ -102,11 +105,10 @@ export async function frontmatterIter(callback) {
 	let spt = []
 	let spt_conf = { 'docs/:path(.*)': ':path' }
 
-	if (fs.existsSync(local_conf)) {
-		const data = await import(local_conf)
-		if (data.source_path_translations) {
-			spt_conf = data.source_path_translations
-		}
+	/* Check for config override file. */
+	const lconf = await loadLocalConf()
+	if (lconf && lconf.source_path_translations) {
+		spt_conf = lconf.source_path_translations
 	}
 
 	spt = Object.entries(spt_conf).map(([from, to]) => ({