From 599e7669d0ea5b082f4b65754e976557d36d0970 Mon Sep 17 00:00:00 2001
From: Matt Baer <matt@write.as>
Date: Fri, 27 Mar 2020 12:19:59 -0400
Subject: [PATCH] Add CSS cache busting to templates in release

---
 Makefile                  |  1 +
 scripts/invalidate-css.sh | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)
 create mode 100755 scripts/invalidate-css.sh

diff --git a/Makefile b/Makefile
index 85f02d3..05bc1c6 100644
--- a/Makefile
+++ b/Makefile
@@ -86,6 +86,7 @@ release : clean ui assets
 	cp -r templates $(BUILDPATH)
 	cp -r pages $(BUILDPATH)
 	cp -r static $(BUILDPATH)
+	scripts/invalidate-css.sh $(BUILDPATH)
 	mkdir $(BUILDPATH)/keys
 	$(MAKE) build-linux
 	mv build/$(BINARY_NAME)-linux-amd64 $(BUILDPATH)/$(BINARY_NAME)
diff --git a/scripts/invalidate-css.sh b/scripts/invalidate-css.sh
new file mode 100755
index 0000000..c411f70
--- /dev/null
+++ b/scripts/invalidate-css.sh
@@ -0,0 +1,37 @@
+#!/bin/bash
+#
+#	Copyright © 2020 A Bunch Tell LLC.
+#
+#	This file is part of WriteFreely.
+#
+#	WriteFreely is free software: you can redistribute it and/or modify
+#	it under the terms of the GNU Affero General Public License, included
+#	in the LICENSE file in this source code package.
+#
+###############################################################################
+#
+# WriteFreely CSS invalidation script
+#
+# usage: ./invalidate-css.sh <build-directory>
+#
+# This script provides an automated way to invalidate stylesheets cached in the
+# browser. It uses the last git commit hashes of the most frequently modified
+# LESS files in the project and appends them to the stylesheet `href` in all
+# template files.
+#
+# This is designed to be used when building a WriteFreely release.
+#
+###############################################################################
+
+# Get parent build directory from first argument
+buildDir=$1
+
+# Get short hash of each primary LESS file's last commit
+cssHash=$(git log -n 1 --pretty=format:%h -- less/core.less)
+cssNewHash=$(git log -n 1 --pretty=format:%h -- less/new-core.less)
+cssPadHash=$(git log -n 1 --pretty=format:%h -- less/pad.less)
+
+echo "Adding write.css version ($cssHash $cssNewHash $cssPadHash) to .tmpl files..."
+cd "$buildDir/templates" || exit 1
+find . -type f -name "*.tmpl" -print0 | xargs -0 sed -i "s/write.css/write.css?${cssHash}${cssNewHash}${cssPadHash}/g"
+find . -type f -name "*.tmpl" -print0 | xargs -0 sed -i "s/{{.Theme}}.css/{{.Theme}}.css?${cssHash}${cssNewHash}${cssPadHash}/g"
\ No newline at end of file