From 2c93b65d2c03c087061b665a8acc3a5cc27a00ca Mon Sep 17 00:00:00 2001
From: Ole Eskild Steensen <oleeskilds@gmail.com>
Date: Sun, 30 Aug 2026 22:59:35 +0200
Subject: [PATCH] feat: LOGO_HEIGHT env var to control the site logo size

A bare number is treated as pixels; other simple CSS lengths (rem, em, %,
vh, vw, ch) pass through, anything else is ignored so the env value can't
inject arbitrary CSS. Overrides --dg-logo-height, --dg-logo-height-mobile
and --dg-filetree-logo-height.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LYAomPqxuzVV25xjcqgGTs
---
 src/site/_data/meta.js                       | 11 +++++++++++
 src/site/_includes/components/pageheader.njk |  9 +++++++++
 2 files changed, 20 insertions(+)

diff --git a/src/site/_data/meta.js b/src/site/_data/meta.js
index 8013f519b..9f4271b4d 100644
--- a/src/site/_data/meta.js
+++ b/src/site/_data/meta.js
@@ -15,6 +15,16 @@ module.exports = async (data) => {
     // Use the first match and convert to site-relative path
     logoPath = "/" + logoFiles[0].split("src/site/")[1];
   }
+
+  // Logo height override. A bare number means pixels; any other value must
+  // be a simple CSS length (e.g. "3rem") — anything else is ignored so the
+  // env value can't inject arbitrary CSS.
+  let logoHeight = (process.env.LOGO_HEIGHT || "").trim();
+  if (/^\d+(\.\d+)?$/.test(logoHeight)) {
+    logoHeight += "px";
+  } else if (!/^\d+(\.\d+)?(px|rem|em|%|vh|vw|ch)$/.test(logoHeight)) {
+    logoHeight = "";
+  }
   if (themeStyle) {
     themeStyle = themeStyle.split("site")[1];
   }
@@ -100,6 +110,7 @@ module.exports = async (data) => {
     baseTheme: process.env.BASE_THEME || "dark",
     siteName: process.env.SITE_NAME_HEADER || "Digital Garden",
     siteLogoPath: logoPath,
+    logoHeight,
     mainLanguage: process.env.SITE_MAIN_LANGUAGE || "en",
     siteBaseUrl: baseUrl,
     styleSettingsCss,
diff --git a/src/site/_includes/components/pageheader.njk b/src/site/_includes/components/pageheader.njk
index 9905d8a46..208b7690c 100644
--- a/src/site/_includes/components/pageheader.njk
+++ b/src/site/_includes/components/pageheader.njk
@@ -65,5 +65,14 @@
         {{ meta.styleSettingsCss | safe }}
     </style>
 {% endif %}
+{% if meta.logoHeight %}
+    <style>
+        :root {
+            --dg-logo-height: {{ meta.logoHeight }};
+            --dg-logo-height-mobile: {{ meta.logoHeight }};
+            --dg-filetree-logo-height: {{ meta.logoHeight }};
+        }
+    </style>
+{% endif %}
 <style>
 </style>