From dea803557bd3d3016883cafe89c783d85fcd27c1 Mon Sep 17 00:00:00 2001
From: Lizzy Fleckenstein <eliasfleckenstein@web.de>
Date: Sat, 29 Apr 2023 21:22:46 +0200
Subject: [PATCH] gen-thumbs: only update changed files; use one process per
 core

---
 gen-thumbs | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/gen-thumbs b/gen-thumbs
index 7841b5f..13bffe1 100755
--- a/gen-thumbs
+++ b/gen-thumbs
@@ -2,7 +2,13 @@
 
 # Generates thumbs
 
-rm -rf .thumbs/
-mkdir .thumbs
-
-find \( -iname "*.png" -or -iname "*.jpg" -or -iname "*.jpeg" -or -iname "*.jfif" -or -iname "*.gif" -or -iname "*.webp" \) -exec bash -c 'mogrify -path .thumbs/ -auto-orient -thumbnail 128x128 -quality 90% "{}" &' \;
+if [ "$1" != "" ]; then
+	target_file=.thumbs/$(basename -- "$1")
+	if [ "$1" -nt "$target_file" ]; then
+		echo "update $target_file"
+		mogrify -path .thumbs/ -auto-orient -thumbnail 128x128 -quality 90% "$1"
+	fi
+else
+	mkdir -p .thumbs
+	find -not -path "./.thumbs/*" \( -iname "*.png" -or -iname "*.jpg" -or -iname "*.jpeg" -or -iname "*.jfif" -or -iname "*.gif" -or -iname "*.webp" \) | parallel -j$(nproc) "$0" {}
+fi
-- 
2.44.0