New upstream version 42.0upstream/42.0

1 files changed, 83 insertions, 0 deletions

diff --git a/src/simple-scan-postprocessing.sh b/src/simple-scan-postprocessing.sh
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+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0-or-later
+# Copyright (C) 2022 Alexander Vogt
+# Author: Alexander Vogt <a.vogt@fulguritus.com>
+#
+# Sample postprocessing script for gnome-simple-scan for OCR in PDFs
+#
+# This script first identifies a suitable instance of ocrmypdf
+# (https://github.com/ocrmypdf/OCRmyPDF) and then applies this as a
+# postprocessing step to PDFs generated by simple-scan.
+#
+# Usage:
+# =====
+# simple-scan-postprocessing mime-type keep-origin input-file args
+#
+# Currently, only mime-type "application/pdf" is supported, the script will
+# exit without an error if "image/jpeg", "image/png", or "image/webp" is
+# provided. Any other mime-type results in an error.
+# All args are provided to ocrmypdf.
+# If keep-origin is set to "true", a copy of the source file is kept.
+#
+# Example:
+# =======
+# simple-scan-postprocessing application/pdf true scan.pdf -l eng+deu
+# simple-scan-postprocessing application/pdf true scan.pdf -rcd --jbig2-lossy -l deu
+#
+set -e +m
+
+# Arguments
+mime_type="$1"
+keep_original="$2"
+target="$3"
+remainder="${@:4}"
+# Globals
+_ocrmypdfcontainer="jbarlow83/ocrmypdf"
+
+source="${target%.*}_orig.${target##*.}"
+
+# Helper functions
+function findOcrMyPdf() {
+	# Determines the path of ocrmypdf in the following order:
+	#   1. ocrmypdf from the $PATH (local installation)
+	#   2. ocrmypdf through podman (if podman in $PATH)
+	#   3. ocrmypdf through docker (if podman in $PATH)
+	_ocrmypdf=$(which ocrmypdf) && return
+	_ocrmypdf="$(which podman) run --rm -i ${_ocrmypdfcontainer} " && return
+	_ocrmypdf="$(which docker) run --rm -i ${_ocrmypdfcontainer} "
+	if [ $? -ne 0 ]; then
+		echo "No suitable instance of ocrmypdf found. Please check your setup. "
+		exit 1
+	fi
+}
+
+case ${mime_type} in
+	"application/pdf")
+		mv "$target" "$source" # create a backup
+
+		# Determine the version of ocrmypdf to use
+		findOcrMyPdf
+		# Execute OCR
+		${_ocrmypdf} ${remainder} - - <"$source" >"$target"
+		;;
+	"image/jpeg")
+		exit 0 # Nothing implemented
+		;;
+	"image/png")
+		exit 0 # Nothing implemented
+		;;
+	"image/webp")
+		exit 0 # Nothing implemented
+		;;
+	*)
+		echo "Unsupported mime-type \"${mime_type}\""
+		exit 1
+		;;
+esac
+
+# Clean up
+if [ "$keep_original" == "true" ]; then
+	exit 0
+else
+	rm "$source"
+fi