pdfcropper

#!/usr/bin/env bash
#
# NAME
#
#   pdfcropper - run krop on a page range
#
# SYNOPSIS
#
#   pdfcropper <file>
#
# DESCRIPTION
#
#   pdfcropper extracts a range of pages from the supplied PDF using
#   pdfjam and gives it to krop -- a simple graphical tool to crop PDF
#   pages.  Although krop has the functionality to krop a range of
#   pages, it is slower on large PDFs, ergo this script.
#
# DEPENDENCIES
#
#   krop(1), zenity(1), and pdfjam(1)
#
# SEE ALSO
#
#   krop <http://arminstraub.com/software/krop>
#

[[ "$*" ]] || {
    echo >&2 "usage: ${0##*/} <file>"
    exit 1
}

pdf="$(mktemp -t XXXXXX.pdf)"
trap 'rm -rf "$pdf" >/dev/null 2>&1' EXIT
trap 'exit 2' HUP INT QUIT TERM

pages=$(zenity --entry --title="PDF Cropper" --text="Enter page range")

[[ "$pages" =~ [0-9,-]+ ]] || {
    echo >&2 "${0##*/}: error extracting pages"
    exit 1
}

# We could've used pdftk, but pdfjam is faster for extracting pages.
echo >&2 "${0##*/}: extracting page(s)"
pdfjam "$1" "$pages" -o "$pdf"

echo >&2 "${0##*/}: running krop"
exec krop "$pdf" -o "${1%.*}-cropped.pdf"