v1.0.5 Many changes

- Supports MacOS  
- Supports filenames with spaces  
- Has parameters and options now  
- Can define optional output file  
- Help Info with parameter (-h)
- Define scale factor with parameter (-s factor)
- Print version with parameter -V
- Verbose output with parameter -v
- Don't use sed anymore (uses pure bash for what sed was used, or tr)
- New messages if failed dependencies
- Changed how page dimensions are obtained (still needs imagemagick)

pdfScale.sh

@@ -1,36 +1,157 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # pdfScale.sh
 #
 # Scale PDF to specified percentage of original size.
-# Ref: http://ma.juii.net/blog/scale-page-content-of-pdf-files.
+# Based on: http://ma.juii.net/blog/scale-page-content-of-pdf-files
+#      And: 
 
-echo "This script doesn't handle files with spaces in them."
+#echo "This script HANDLES files with spaces in them."
 
-SCALE=0.95 # scaling factor (0.95 = 95%, e.g.)
+VERSION="1.0.5"
+SCALE=0.95   # scaling factor (0.95 = 95%, e.g.)
+VERBOSE=0    # verbosity Level
+
+
+printVersion() {
+	echo "$(basename $0) v$VERSION"
+}
+
+printHelp() {
+	printVersion
+	echo "
+Usage: $0 [-v] [-s <factor>] <inFile.pdf> [outfile.pdf]
+       $0 -h
+       $0 -V
+
+Parameters:
+ -v          Verbose mode, prints extra information
+ -h          Print this help to screen and exits
+ -V          Prints version to screen and exits
+ -s <factor> Changes the scaling factor, defaults to 0.95
+             MUST be a number bigger than zero. 
+             Eg. -s 0.8 for 80% of the original size 
+
+Notes:
+ - Options must be passed before the file names to be parsed
+ - The output filename is optional. If no file name is passed
+   the output file will have the same name/destination of the
+   input file, with .SCALED.pdf at the end (instead of just .pdf)
+ - Having the extension .pdf on the output file name is optional,
+   it will be added if not present
+ - Should handle file names with spaces without problems
+ - The scaling is centered and using a scale bigger than 1 may
+   result on cropping parts of the pdf.
+
+Examples:
+ pdfScale myPdfFile.pdf
+ pdfScale myPdfFile.pdf myScaledPdf
+ pdfScale -v myPdfFile.pdf
+ pdfScale -s 0.85 myPdfFile.pdf myScaledPdf.pdf
+ pdfScale -v -s 0.7 myPdfFile.pdf
+ pdfScale -h
+"
+}
+
+usage() { 
+	printVersion
+	echo "Usage: $0 [-v] [-s <factor>] <inFile.pdf> [outfile.pdf]" 1>&2
+	echo "Try:   $0 -h # for help" 1>&2
+	exit 1
+}
+
+parseScale() {
+	if ! [[ -n "$1" && "$1" =~ ^-?[0-9]*([.][0-9]+)?$ && (($1 > 0 )) ]] ; then
+		echo "Invalid factor: $1"
+		echo "The factor must be a number between 0 and 1."
+		echo "Example: for 80% use 0.8"
+		exit 2
+	fi
+	SCALE=$1
+}
+
+vprint() {
+	[[ $VERBOSE -eq 0 ]] && return 0
+	timestamp="$(date +%Y-%m-%d:%H:%M:%S)"
+	echo "$timestamp | $1"
+}
+
+while getopts ":vhVs:" o; do
+    case "${o}" in
+        v)
+            VERBOSE=1
+            ;;
+        h)
+            printHelp
+            exit 0
+            ;;
+        V)
+            printVersion
+            exit 0
+            ;;
+        s)
+            parseScale ${OPTARG}
+            ;;
+        *)
+            usage
+            ;;
+    esac
+done
+shift $((OPTIND-1))
+
+printDependency() {
+	echo >&2 $'\n'"ERROR! You need to install the package '$1'"$'\n'
+	echo >&2 "Linux apt-get.: sudo apt-get install $1"
+	echo >&2 "Linux yum.....: sudo yum install $1"
+	echo >&2 "MacOS homebrew: brew install $1"
+	echo >&2 $'\n'"Aborting..."
+	exit 3
+}
+
+vprint "$(basename $0) v$VERSION - Verbose execution"
+
+# Dependencies
+vprint "Checking dependencies"
+command -v identify >/dev/null 2>&1 || printDependency 'imagemagick'
+command -v gs >/dev/null 2>&1 || printDependency 'ghostscript'
+command -v bc >/dev/null 2>&1 || printDependency 'bc'
+
+vprint "  Scale factor: $SCALE"
 
 # Validate args.
-[ $# -eq 1 ] || { echo "***ERROR: Usage pdfScale.sh <inFile>.pdf"; exit 99; }
+[[ $# -lt 1 ]] && { usage; exit 1; }
 INFILEPDF="$1"
-[[ "$INFILEPDF" =~ ^..*\.pdf$ ]] || { echo "***ERROR: Usage pdfScale.sh <inFile>.pdf"; exit 99; }
-OUTFILEPDF=$(echo "$INFILEPDF" | sed -e s/\.pdf$// -).SCALED.pdf
+[[ "$INFILEPDF" =~ ^..*\.pdf$ ]] || { usage; exit 2; }
+vprint "    Input file: $INFILEPDF"
+
+if [[ -z $2 ]]; then
+	OUTFILEPDF="${INFILEPDF%.pdf}.SCALED.pdf"
+else
+	OUTFILEPDF="${2%.pdf}.pdf"
+fi
+vprint "   Output file: $OUTFILEPDF"
 
-# Dependencies
-command -v identify >/dev/null 2>&1 || { echo >&2 "Please install 'imagemagick' (sudo apt-get install imagemagick).  Aborting."; exit 1; }
-command -v gs >/dev/null 2>&1 || { echo >&2 "Please install 'ghostscript' (sudo apt-get install ghostscript ?).  Aborting."; exit 1; }
-command -v bc >/dev/null 2>&1 || { echo >&2 "Please install 'bc' arbitrary precision calculator language.  Aborting."; exit 1; }
 
 # Get width/height in postscript points (1/72-inch), via ImageMagick identify command.
 # (Alternatively, could use Poppler pdfinfo command; or grep/sed the PDF by hand.)
-IDENTIFY=($(identify $INFILEPDF 2>/dev/null)) # bash array
-[ $? -ne 0 ] &GEOMETRY=($(echo ${IDENTIFY[2]} | tr "x" " ")) # bash array — $IDENTIFY[2] is of the form PGWIDTHxPGHEIGHT
-PGWIDTH=${GEOMETRY[0]}; PGHEIGHT=${GEOMETRY[1]}
+IDENTIFY=$(identify -format "%G" "$INFILEPDF" 2>/dev/null)
+[[ -z $IDENTIFY ]] && { echo "Error when getting PDF size! Aborting..." ; exit 11; }
+
+IDENTIFY="$(echo "$IDENTIFY" | tr "x" " " 2>/dev/null | tr -d "+" 2>/dev/null)"
+IDENTIFY=($(echo "$IDENTIFY")) # transform in a bash array
+PGWIDTH=${IDENTIFY[0]}
+PGHEIGHT=${IDENTIFY[1]}
+vprint "         Width: $PGWIDTH postscript-points"
+vprint "        Height: $PGHEIGHT postscript-points"
+
 
 # Compute translation factors (to center page.
 XTRANS=$(echo "scale=6; 0.5*(1.0-$SCALE)/$SCALE*$PGWIDTH" | bc)
 YTRANS=$(echo "scale=6; 0.5*(1.0-$SCALE)/$SCALE*$PGHEIGHT" | bc)
+vprint " Translation X: $XTRANS"
+vprint " Translation Y: $YTRANS"
 
-echo $PGWIDTH , $PGHEIGHT , $OUTFILEPDF , $SCALE , $XTRANS , $YTRANS , $INFILEPDF , $OUTFILEPDF
+#echo $PGWIDTH , $PGHEIGHT , $OUTFILEPDF , $SCALE , $XTRANS , $YTRANS , $INFILEPDF , $OUTFILEPDF
 
 # Do it.
 gs \
@@ -41,4 +162,4 @@ gs \
 -dDEVICEWIDTH=$PGWIDTH -dDEVICEHEIGHT=$PGHEIGHT \
 -sOutputFile="$OUTFILEPDF" \
 -c "<</BeginPage{$SCALE $SCALE scale $XTRANS $YTRANS translate}>> setpagedevice" \
--f "$INFILEPDF"
+-f "$INFILEPDF"