From 8fe946aebcf665e1f3da7e51f26f01a2432088bf Mon Sep 17 00:00:00 2001
From: Pau RE <prodrigestivill@gmail.com>
Date: Wed, 10 Jul 2024 13:09:01 +0200
Subject: [PATCH] Fix gemini links

---
 Makefile          |  2 +-
 pandoc-filter.lua | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 pandoc-filter.lua

diff --git a/Makefile b/Makefile
index 8d56f4ca..96bbbcc1 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,7 @@ CHAPTERS=$(shell grep -Eoi '\([^\)]+' src/SUMMARY.md | sed -e 's,^.,src/,')
 
 PANDOC_OPTIONS+=-f markdown+rebase_relative_paths
 PANDOC_OPTIONS+=--metadata-file=metadata.yaml
+PANDOC_OPTIONS+=--lua-filter=pandoc-filter.lua
 
 # PDF: Add cover and hide title text page
 PANDOC_PDF_OPTIONS+=-B cover.tex -V title:
@@ -28,7 +29,6 @@ epub:
 
 texi:
 	pandoc $(CHAPTERS) $(PANDOC_OPTIONS) -o r2book.texi
-	sed -i -E 's,@uref\{[0-9a-z/_-]+gemini://,@uref\{gemini://,gI' r2book.texi # fix gemini link
 
 info: texi
 	rm -f r2book.info r2book.info.gz
diff --git a/pandoc-filter.lua b/pandoc-filter.lua
new file mode 100644
index 00000000..435997e5
--- /dev/null
+++ b/pandoc-filter.lua
@@ -0,0 +1,10 @@
+-- Fix gemini:// links
+-- Requiered until this PR gets merged
+-- https://github.com/jgm/pandoc/pull/9968
+function Link(el)
+  protopos = string.find(el.target, "/gemini://")
+  if protopos then
+    el.target = string.sub(el.target, protopos + 1);
+  end
+  return el
+end