Fixes #120

common/parser.test.ts

@@ -1,6 +1,10 @@
 import { parse } from "./parse_tree.ts";
 import buildMarkdown from "./parser.ts";
-import { findNodeOfType, renderToText } from "../plug-api/lib/tree.ts";
+import {
+  collectNodesOfType,
+  findNodeOfType,
+  renderToText,
+} from "../plug-api/lib/tree.ts";
 import { assertEquals, assertNotEquals } from "../test_deps.ts";
 
 const sample1 = `---
@@ -11,6 +15,8 @@ tags:
 ---
 # This is a doc
 
+Here is a [[wiki link]] and a [[wiki link|alias]].
+
 Supper`;
 
 const sampleInvalid1 = `---
@@ -25,9 +31,21 @@ Deno.test("Test parser", () => {
     lang,
     sample1,
   );
-  console.log("tree", JSON.stringify(tree, null, 2));
+  // console.log("tree", JSON.stringify(tree, null, 2));
   // Check if rendering back to text works
   assertEquals(renderToText(tree), sample1);
+
+  // Find wiki link and wiki link alias
+  const links = collectNodesOfType(tree, "WikiLink");
+  assertEquals(links.length, 2);
+  const nameNode = findNodeOfType(links[0], "WikiLinkPage");
+  assertEquals(nameNode?.children![0].text, "wiki link");
+
+  // Check if alias is parsed properly
+  const aliasNode = findNodeOfType(links[1], "WikiLinkAlias");
+  assertEquals(aliasNode?.children![0].text, "alias");
+
+  // Find frontmatter
   let node = findNodeOfType(tree, "FrontMatter");
   assertNotEquals(node, undefined);
   tree = parse(lang, sampleInvalid1);

common/parser.ts

@@ -20,10 +20,10 @@ import {
   mdExtensionSyntaxConfig,
 } from "./markdown_ext.ts";
 
-export const pageLinkRegex = /^\[\[([^\]]+)\]\]/;
+export const pageLinkRegex = /^\[\[([^\]\|]+)(\|([^\]]+))?\]\]/;
 
 const WikiLink: MarkdownConfig = {
-  defineNodes: ["WikiLink", "WikiLinkPage", {
+  defineNodes: ["WikiLink", "WikiLinkPage", "WikiLinkAlias", {
     name: "WikiLinkMark",
     style: t.processingInstruction,
   }],
@@ -38,11 +38,25 @@ const WikiLink: MarkdownConfig = {
         ) {
           return -1;
         }
+        const [_fullMatch, page, pipePart, label] = match;
         const endPos = pos + match[0].length;
+        let aliasElts: any[] = [];
+        if (pipePart) {
+          const pipeStartPos = pos + 2 + page.length;
+          aliasElts = [
+            cx.elt("WikiLinkMark", pipeStartPos, pipeStartPos + 1),
+            cx.elt(
+              "WikiLinkAlias",
+              pipeStartPos + 1,
+              pipeStartPos + 1 + label.length,
+            ),
+          ];
+        }
         return cx.addElement(
           cx.elt("WikiLink", pos, endPos, [
             cx.elt("WikiLinkMark", pos, pos + 2),
-            cx.elt("WikiLinkPage", pos + 2, endPos - 2),
+            cx.elt("WikiLinkPage", pos + 2, pos + 2 + page.length),
+            ...aliasElts,
             cx.elt("WikiLinkMark", endPos - 2, endPos),
           ]),
         );
@@ -222,6 +236,7 @@ export default function buildMarkdown(mdExtensions: MDExt[]): Language {
           styleTags({
             WikiLink: ct.WikiLinkTag,
             WikiLinkPage: ct.WikiLinkPageTag,
+            WikiLinkAlias: ct.WikiLinkPageTag,
             // CommandLink: ct.CommandLinkTag,
             // CommandLinkName: ct.CommandLinkNameTag,
             Task: ct.TaskTag,