From 70b458ad01d96de17e1639ba2d2862a77e22fc8d Mon Sep 17 00:00:00 2001
From: Otthorn <otthorn@crans.org>
Date: Mon, 15 Feb 2021 00:21:22 +0100
Subject: [PATCH] :tada: initial commit

---
 README.md    |  28 ++++++++++
 pdf-optimize | 144 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 172 insertions(+)
 create mode 100644 README.md
 create mode 100755 pdf-optimize

diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1,28 @@
+# pdf-optimize
+
+pdf-optimize is a simple script to optimize pdf using ghostscript.
+You need to have ghoscript installed on your machine.
+
+## Installation
+```
+git clone https://gitea.auro.re/otthorn/pdf-optimize
+cd pdf-optimize
+chmod +x pdf-optimize.sh
+cp pdf-optimize.sh /opt/bin/pdf-optimize
+```
+
+Don't forget to add `/opt/bin` to your `PATH`.
+If you can add this line at the end of your `bashrc` (or whatever your use)
+
+```
+PATH=$PATH:/opt/bin"
+```
+
+## Usage
+
+You can get help using
+```
+pdf-optimize -h
+```
+
+
diff --git a/pdf-optimize b/pdf-optimize
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+++ b/pdf-optimize
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+#!/bin/bash
+# Compress pdf using Ghostscript
+
+function usage
+{
+	echo "usage: pdf-optimize [options] input.pdf"
+	echo "    ";
+	echo "  -o | --output			: output filename";
+	echo "  -q | --quiet			: run quietly";
+	echo "  -v | --verbose		: run verbosly";
+	echo "  -y | --yes-to-replace 	: yes to replace existing files";
+	echo "  -h | --help			: print this message";
+	echo "    ";
+	echo "If no output path is specified, given input.pdf as input will output
+input_compressed.pdf"
+}
+
+function arg_parse
+{
+	# if no argument is given print help
+	if [[ -z "$1" ]]; then
+		usage; exit;
+	fi
+
+	# positional arguments
+	args=()
+
+	while [ "$1" != "" ]; do
+		case "$1" in
+			-o | --output )			output_path="$2";		shift;;
+			-q | --quiet )			quiet=1;;
+			-v | --verbose )    	verbose=1;;
+			-y | --yes-to-replace ) replace=1;;
+			-h | --help )			usage; 					exit;;
+			* )						args+=("$1")
+		esac
+		shift
+	done
+
+	# restore positional argument
+	set -- "${args[@]}"
+
+	# only the first one should be used
+	input_path="${args[0]}"
+
+	# add default output path if none is given
+	if [[ -z "$output_path" ]]; then
+		output_path="${input_path%.*}_compressed.pdf";
+	fi
+
+	# check if the output file already exists before writting to it
+	if [[ -f "$output_path" && "$replace" == 0 ]]; then
+		yes_or_no "$output_path already exists, do you want to replace it?" ||
+			exit 1;
+	fi
+
+	# check if the input file exists
+	if [[ ! -f "$input_path" ]]; then
+		echo "$input_path does not exist."
+		echo "Aborting";
+		exit 1;
+	fi
+}
+
+function yes_or_no
+{
+	read -p "$* [y/N]: " ans
+	case "$ans" in
+		[yY] | [yY]es )		return 0;;
+		* )					echo "Aborting"; return 1;;
+	esac
+}
+
+function run
+{
+	arg_parse "$@";
+	
+	# print general information
+	if [[ "$quiet" != 1 ]]; then
+		echo "Compressing from ${bold}$input_path${normal} into \
+${bold}$output_path${normal}."
+	fi
+
+	# run the compression using ghostscript
+	if [[ "$verbose" != 1 ]]; then
+		ghostscript -sDEVICE=pdfwrite \
+		   -dCompatibilityLevel=1.4 \
+		   -dPDFSETTINGS=/prepress \
+		   -dNOPAUSE \
+		   -dQUIET \
+		   -dBATCH \
+		   -sOutputFile=$output_path \
+		   $input_path
+	else
+		echo "input_path=$input_path";
+		echo "output_path=$output_path";
+		echo "quiet=$quiet";
+		echo "verbose=$verbose";
+		echo "replace=$replace";
+		echo "    ";
+		ghostscript -sDEVICE=pdfwrite \
+		   -dCompatibilityLevel=1.4 \
+		   -dPDFSETTINGS=/prepress \
+		   -dNOPAUSE \
+		   -dBATCH \
+		   -sOutputFile=$output_path \
+		   $input_path 
+	fi
+	
+	# catching errors
+	if [[ "$?" != 0 ]]; then
+		echo "Something went wrong with ghostscript.";
+		echo "Aborting.";
+		exit 1;
+	fi
+
+	# compute the compresion rate
+	if [[ "$quiet" != 1 ]]; then
+		compute_compression;
+	fi
+}
+
+function compute_compression
+{
+	input_size=`du "$input_path" | cut -f1`
+	output_size=`du "$output_path" | cut -f1`
+	percentage=`echo "scale=1;$output_size / $input_size * 100" | bc -l`
+	input_size_h=`du -h "$input_path" | cut -f1`
+	output_size_h=`du -h "$output_path" | cut -f1`
+
+	echo "Size reduced from ${bold}$input_size_h${normal} to ${bold}$output_size_h${normal} [$percentage %]"
+}
+
+# font settings
+bold=$(tput bold)
+normal=$(tput sgr0)
+
+# default values
+quiet=0;   # do not be quiet
+verbose=0; # do not be verbose
+replace=0; # do not replace existing files
+
+# execute main function
+run "$@";