From: Hendrik Jäger <gitcommit@henk.geekmail.org>
Date: Thu, 29 Dec 2022 09:36:31 +0000 (+0100)
Subject: refactor and handle errors
X-Git-Url: https://git.netwichtig.de/gitweb/?a=commitdiff_plain;h=0b844ff0879674034d6a2c0457191fa6e4513b61;p=user%2Fhenk%2Fvcsh%2Fzsh.git

refactor and handle errors
---

diff --git a/.zsh_functions/henkspngpostproc b/.zsh_functions/henkspngpostproc
index c35650d..e721f4c 100644
--- a/.zsh_functions/henkspngpostproc
+++ b/.zsh_functions/henkspngpostproc
@@ -1,25 +1,30 @@
+setopt PIPE_FAIL
+
 local resize_by
 local img
 resize_by="$1"
 shift
-echo "Creating Directories …"
-mkdir --parents resized/pngnqed/optipnged optimized
 for img in $*
 do
-	echo "Resizing image …"
-	convert -resize $resize_by% "$img" "resized/$img"
-	echo "Running pngnq …"
-	pngnq -s1 -f -d "resized/pngnqed" -e .png "resized/$img"
-	echo "Running optipng …"
-	optipng -force -out "resized/pngnqed/optipnged/$img" "resized/pngnqed/$img"
-	echo "Moving final image to directory 'optimized' …"
-	cp --verbose --interactive --target-directory=optimized/ "resized/pngnqed/optipnged/$img"
-	echo "Removing temporary images …"
-	#rm --verbose --interactive \
-	rm --verbose \
-		"resized/$img" \
-		"resized/pngnqed/$img" \
-		"resized/pngnqed/optipnged/$img"
-	img2pdf --output $(basename $img .png).pdf optimized/${img}
+	echo "Processing ${img} ..."
+	# mostly to remove the alpha channel so ocrmypdf can work with it
+	# does not seem to work all the time, so 'convert' is used as well below
+	# still nice to optimize
+	optipng "${img}"
+	if [ $? -ne 0 ]
+	then
+		echo "optipng failed"
+		return
+	fi
+	# resize
+	# and remove alpha channel so ocrmypdf can work with it
+	# ocrmypdf does the quantization of the png which reduces size drastically
+	convert -resize $resize_by% -alpha off "$img" - \
+	| ocrmypdf - "$(basename $img .png).pdf"
+	if [ $? -ne 0 ]
+	then
+		echo "convert or ocrmypdf failed"
+		return
+	fi
 done
-rmdir --parents resized/pngnqed/optipnged
+