From 186b25ac5e3a4fadcea8281d141bd311cb0e08a6 Mon Sep 17 00:00:00 2001
From: Ignacio Ballesteros <ignacio.ballesteros@imdea.org>
Date: Sun, 22 Feb 2026 22:26:03 +0100
Subject: [PATCH] Switch ox-hugo export from TOML to YAML frontmatter

TOML frontmatter interprets bare dates like 2022-10-31 as date literals
requiring time components, causing parsing issues. YAML handles dates
as strings by default, avoiding these problems.

Changes:
- export.ex: Add org-hugo-front-matter-format set to yaml
- index.ex: Update title regex to match YAML format (title: vs title =)
- quartz.config.ts: Use default FrontMatter plugin (YAML) instead of TOML
---
 lib/org_garden/export.ex       | 3 +++
 lib/org_garden/index.ex        | 7 ++++---
 quartz-config/quartz.config.ts | 4 +---
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/lib/org_garden/export.ex b/lib/org_garden/export.ex
index 3f85c8c..cf2ac44 100644
--- a/lib/org_garden/export.ex
+++ b/lib/org_garden/export.ex
@@ -73,6 +73,9 @@ defmodule OrgGarden.Export do
                   (format "[cite:%s]" (string-join keys ";")))))
             """,
             "--eval", "(setq org-cite-export-processors '((t passthrough)))",
+            # Use YAML frontmatter instead of TOML to avoid date parsing issues
+            # (TOML interprets bare dates like 2022-10-31 as date literals requiring time)
+            "--eval", "(setq org-hugo-front-matter-format 'yaml)",
             "--eval", ~s[(setq org-hugo-base-dir "#{output_dir}")],
             "--eval", ~s[(setq org-hugo-default-section-directory "#{section}")],
             "--visit", orgfile,
diff --git a/lib/org_garden/index.ex b/lib/org_garden/index.ex
index 8909698..9c38229 100644
--- a/lib/org_garden/index.ex
+++ b/lib/org_garden/index.ex
@@ -29,7 +29,8 @@ defmodule OrgGarden.Index do
             path
             |> File.read!()
             |> then(fn content ->
-              case Regex.run(~r/^title\s*=\s*"(.+)"/m, content) do
+              # Match YAML frontmatter: title: "value" or title: value
+              case Regex.run(~r/^title:\s*"?(.+?)"?\s*$/m, content) do
                 [_, t] -> t
                 _ -> slug
               end
@@ -76,8 +77,8 @@ defmodule OrgGarden.Index do
 
   defp generated_index?(content) do
     # Our generated index uses "title: Index" in YAML frontmatter.
-    # ox-hugo uses TOML frontmatter (title = "..."), so this won't
-    # match user-exported files.
+    # ox-hugo also uses YAML frontmatter now, so we check for our specific
+    # title to distinguish generated vs user-exported index files.
     String.contains?(content, "title: Index")
   end
 end
diff --git a/quartz-config/quartz.config.ts b/quartz-config/quartz.config.ts
index a8540f7..d2fb21e 100644
--- a/quartz-config/quartz.config.ts
+++ b/quartz-config/quartz.config.ts
@@ -55,7 +55,7 @@ const config: QuartzConfig = {
   },
   plugins: {
     transformers: [
-      Plugin.FrontMatter({ delimiters: "+++", language: "toml" }),
+      Plugin.FrontMatter(),
       Plugin.CreatedModifiedDate({
         priority: ["frontmatter", "git", "filesystem"],
       }),
@@ -68,8 +68,6 @@ const config: QuartzConfig = {
       }),
       // OxHugoFlavouredMarkdown must come before GitHubFlavoredMarkdown.
       // Note: not compatible with ObsidianFlavoredMarkdown — use one or the other.
-      // If ox-hugo exports TOML frontmatter, change FrontMatter to:
-      //   Plugin.FrontMatter({ delims: "+++", language: "toml" })
       Plugin.OxHugoFlavouredMarkdown(),
       Plugin.GitHubFlavoredMarkdown(),
       Plugin.TableOfContents(),