From 4d338cec137a30fdc00771235f75d46fed878002 Mon Sep 17 00:00:00 2001
From: Aaron Pham <29749331+aarnphm@users.noreply.github.com>
Date: Sun, 21 Jan 2024 14:33:32 -0500
Subject: [PATCH] feat(ofm): add options to parse arrows (#713)

* feat(ofm): add options to parse arrows

Signed-off-by: Aaron <29749331+aarnphm@users.noreply.github.com>

* feat(ofm): add options to parse arrows

Signed-off-by: Aaron <29749331+aarnphm@users.noreply.github.com>

---------

Signed-off-by: Aaron <29749331+aarnphm@users.noreply.github.com>
---
 docs/features/Obsidian compatibility.md |  1 +
 quartz/plugins/transformers/ofm.ts      | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/docs/features/Obsidian compatibility.md b/docs/features/Obsidian compatibility.md
index d519e17..1254370 100644
--- a/docs/features/Obsidian compatibility.md	
+++ b/docs/features/Obsidian compatibility.md	
@@ -25,6 +25,7 @@ Finally, Quartz also provides `Plugin.CrawlLinks` which allows you to customize
     - `callouts`: whether to enable [[callouts]]. Defaults to `true`
     - `mermaid`: whether to enable [[Mermaid diagrams]]. Defaults to `true`
     - `parseTags`: whether to try and parse tags in the content body. Defaults to `true`
+    - `parseArrows`: whether to try and parse arrows in the content body. Defaults to `true`.
     - `enableInHtmlEmbed`: whether to try and parse Obsidian flavoured markdown in raw HTML. Defaults to `false`
     - `enableYouTubeEmbed`: whether to enable embedded YouTube videos using external image Markdown syntax. Defaults to `false`
 - Link resolution behaviour:
diff --git a/quartz/plugins/transformers/ofm.ts b/quartz/plugins/transformers/ofm.ts
index 8c6f488..e1f7651 100644
--- a/quartz/plugins/transformers/ofm.ts
+++ b/quartz/plugins/transformers/ofm.ts
@@ -23,6 +23,7 @@ export interface Options {
   callouts: boolean
   mermaid: boolean
   parseTags: boolean
+  parseArrows: boolean
   parseBlockReferences: boolean
   enableInHtmlEmbed: boolean
   enableYouTubeEmbed: boolean
@@ -36,6 +37,7 @@ const defaultOptions: Options = {
   callouts: true,
   mermaid: true,
   parseTags: true,
+  parseArrows: true,
   parseBlockReferences: true,
   enableInHtmlEmbed: false,
   enableYouTubeEmbed: true,
@@ -111,6 +113,8 @@ function canonicalizeCallout(calloutName: string): keyof typeof callouts {
 
 export const externalLinkRegex = /^https?:\/\//i
 
+export const arrowRegex = new RegExp(/-{1,2}>/, "g")
+
 // !?               -> optional embedding
 // \[\[             -> open brace
 // ([^\[\]\|\#]+)   -> one or more non-special characters ([,],|, or #) (name)
@@ -294,6 +298,18 @@ export const ObsidianFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options>
             ])
           }
 
+          if (opts.parseArrows) {
+            replacements.push([
+              arrowRegex,
+              (_value: string, ..._capture: string[]) => {
+                return {
+                  type: "html",
+                  value: `<span>&rarr;</span>`,
+                }
+              },
+            ])
+          }
+
           if (opts.parseTags) {
             replacements.push([
               tagRegex,