Fix issues: some document cannot be map from slug

lib/utils.js

@@ -34,7 +34,7 @@ export function getSinglePost(slug) {
 
 
     // List of filenames that will provide existing links to wikilink
-    let currentFilePath = slug !== "index" ? toFilePath(slug) : Node.getMarkdownFolder() + "/index.md"
+    let currentFilePath = toFilePath(slug)
     //console.log("currentFilePath: ", currentFilePath)
 
     var fileContent = Node.readFileSync(currentFilePath)
@@ -52,25 +52,35 @@ export function getSinglePost(slug) {
 
 }
 
+const cachedSlugMap = getSlugHashMap()
+
 export function toFilePath(slug) {
-    // Construct file name from slug of /notes/abcxyz
-    let filePath;
-
-    if (slug === '/') {
-        filePath = Node.getMarkdownFolder() + "/index.md"
-    } else {
-        filePath = Node.getMarkdownFolder() + slug
-                .replaceAll('__', '/')
-                .replaceAll('++++', ' ')
-                .replaceAll('ambersand', '&')
-            + ".md";
+    return cachedSlugMap[slug]
 }
 
-    if (Node.isFile(filePath)) {
-        return filePath
-    } else {
-        return null
-    }
+export function getSlugHashMap() {
+    // This is to solve problem of converting between slug and filepath,
+    // where previously if I convert a slug to a file path sometime
+    // it does not always resolve to correct filepath, converting function is not bi-directional
+    // and not conflict-free, other solution was considered (hash file name into a hash, but this
+    // is not SEO-friendly and make url look ugly ==> I chose this
+
+    const slugMap = new Map()
+    getAllMarkdownFiles().map(aFile => {
+        const aSlug = toSlug(aFile);
+        // if (slugMap.has(aSlug)) {
+        //     slugMap[aSlug].push(aFile)
+        // } else {
+        //     slugMap[aSlug] = [aFile]
+        // }
+        // Note: [Future improvement] Resolve conflict
+        slugMap[aSlug] = aFile
+    })
+
+    slugMap['index'] = Node.getMarkdownFolder() + "/index.md"
+    slugMap['/'] = Node.getMarkdownFolder() + "/index.md"
+
+    return slugMap
 }