From 5b19830a2deaeced88996bcdb29b4cd37debd070 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Motiejus=20Jak=C5=A1tys?= <motiejus@jakstys.lt>
Date: Thu, 27 Nov 2025 07:54:57 +0000
Subject: [PATCH] do not rebuild static files all the time

---
 scripts/Makefile.static | 28 ++++++++++++++++++++++------
 scripts/build           |  2 +-
 2 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/scripts/Makefile.static b/scripts/Makefile.static
index 5f21944..99fbac3 100644
--- a/scripts/Makefile.static
+++ b/scripts/Makefile.static
@@ -7,11 +7,27 @@ GZ = $(patsubst %,%.gz,$(SRCS))
 .PHONY: all
 all: $(ZSTD) $(BR) $(GZ)
 
-%.br: %
-	brotli $<
+define MAKETARGET
 
-%.zst: %
-	zstd -19 $<
+$(1).br: $(1).xxhash
+	brotli -f $(1)
+	touch $(1).br
 
-%.gz: %
-	zopfli $<
+$(1).zst: $(1).xxhash
+	zstd -f -19 $(1)
+	touch $(1).zst
+
+$(1).gz: $(1).xxhash
+	zopfli $(1)
+	touch $(1).gz
+
+# https://github.com/gohugoio/hugo/issues/10842
+$(1).xxhash: $(1)
+	current=$$$$(xxhsum $$< | cut -d' ' -f1); \
+	if [ ! -f $$< ] || [ "$$$$(cat $$@ 2>/dev/null)" != "$$$$current" ]; then \
+		echo "$$$$current" > $$@; \
+	fi
+
+endef
+
+$(foreach f,$(SRCS),$(eval $(call MAKETARGET,$(f))))
diff --git a/scripts/build b/scripts/build
index b554ec6..7a79feb 100755
--- a/scripts/build
+++ b/scripts/build
@@ -2,6 +2,6 @@
 set -xeuo pipefail
 cd "$(git rev-parse --show-toplevel)"
 
-hugo --cleanDestinationDir --printPathWarnings --panicOnWarning
+hugo --printPathWarnings --panicOnWarning
 
 find public -type d | xargs -P4 -n1 make -j4 -sf $PWD/scripts/Makefile.static -C