From 0e821d09cf31581baaca001fa640af0c0a8abe94 Mon Sep 17 00:00:00 2001
From: Riccardo Ferretti <code@riccardoferretti.com>
Date: Fri, 22 Sep 2023 10:47:27 +0200
Subject: [PATCH] Added support for linking to sections in current file

And improved support for links to sections that need to be slugified
---
 .../preview/wikilink-navigation.spec.ts       |  9 ++++++++
 .../features/preview/wikilink-navigation.ts   | 23 +++++++++++++++----
 2 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/packages/foam-vscode/src/features/preview/wikilink-navigation.spec.ts b/packages/foam-vscode/src/features/preview/wikilink-navigation.spec.ts
index b20fbf745..1a6be695c 100644
--- a/packages/foam-vscode/src/features/preview/wikilink-navigation.spec.ts
+++ b/packages/foam-vscode/src/features/preview/wikilink-navigation.spec.ts
@@ -52,6 +52,15 @@ describe('Link generation in preview', () => {
     );
   });
 
+  it('generates a link to a section within the note', () => {
+    expect(md.render(`[[#sec]]`)).toEqual(
+      `<p><a class='foam-note-link' title='sec' href='#sec' data-href='#sec'>#sec</a></p>\n`
+    );
+    expect(md.render(`[[#Section Name]]`)).toEqual(
+      `<p><a class='foam-note-link' title='Section Name' href='#section-name' data-href='#section-name'>#Section Name</a></p>\n`
+    );
+  });
+
   it('generates a link to a note with a specific section', () => {
     expect(md.render(`[[note-b#sec2]]`)).toEqual(
       `<p><a class='foam-note-link' title='My second note#sec2' href='/path2/to/note-b.md#sec2' data-href='/path2/to/note-b.md#sec2'>note-b#sec2</a></p>\n`
diff --git a/packages/foam-vscode/src/features/preview/wikilink-navigation.ts b/packages/foam-vscode/src/features/preview/wikilink-navigation.ts
index f91af7379..b02c656ca 100644
--- a/packages/foam-vscode/src/features/preview/wikilink-navigation.ts
+++ b/packages/foam-vscode/src/features/preview/wikilink-navigation.ts
@@ -9,6 +9,7 @@ import { toVsCodeUri } from '../../utils/vsc-utils';
 import { MarkdownLink } from '../../core/services/markdown-link';
 import { Range } from '../../core/model/range';
 import { isEmpty } from 'lodash';
+import { toSlug } from '../../utils/slug';
 
 export const markdownItWikilinkNavigation = (
   md: markdownit,
@@ -26,18 +27,29 @@ export const markdownItWikilinkNavigation = (
           isEmbed: false,
         });
         const formattedSection = section ? `#${section}` : '';
+        const linkSection = section ? `#${toSlug(section)}` : '';
         const label = isEmpty(alias) ? `${target}${formattedSection}` : alias;
 
+        // [[#section]] links
+        if (target.length === 0) {
+          // we don't have a good way to check if the section exists within the
+          // open file, so we just create a regular link for it
+          return getResourceLink(section, linkSection, label);
+        }
+
         const resource = workspace.find(target);
         if (isNone(resource)) {
           return getPlaceholderLink(label);
         }
 
-        const link = `${vscode.workspace.asRelativePath(
+        const resourceLink = `/${vscode.workspace.asRelativePath(
           toVsCodeUri(resource.uri)
-        )}${formattedSection}`;
-        const title = `${resource.title}${formattedSection}`;
-        return `<a class='foam-note-link' title='${title}' href='/${link}' data-href='/${link}'>${label}</a>`;
+        )}`;
+        return getResourceLink(
+          `${resource.title}${formattedSection}`,
+          `${resourceLink}${linkSection}`,
+          label
+        );
       } catch (e) {
         Logger.error(
           `Error while creating link for [[${wikilink}]] in Preview panel`,
@@ -52,4 +64,7 @@ export const markdownItWikilinkNavigation = (
 const getPlaceholderLink = (content: string) =>
   `<a class='foam-placeholder-link' title="Link to non-existing resource" href="javascript:void(0);">${content}</a>`;
 
+const getResourceLink = (title: string, link: string, label: string) =>
+  `<a class='foam-note-link' title='${title}' href='${link}' data-href='${link}'>${label}</a>`;
+
 export default markdownItWikilinkNavigation;