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#!/bin/bash
### Author: Anonymous.
extendedhelp="### $0
#
# Takes two input PDF files, and writes an output PDF file.
# Thereby using the pages from the first input file as the odd pages
# of the output file and the pages of the second input file as the
# even pages of the output file.
#
# In more detail, if o ('odd') is a page number of the first input
# file, e ('even') is a page number of the second input file and
# r ('result') is a page number of the output file, the following
# relations hold true:
#
# 2*e --> r (for r/2 a natural number)
# 2*o - 1 --> r (for (r+1)/2 a natural number)
#
# In case one input file is too short to fill up, the above relations
# will _not_ hold true after one input file ran out of pages; instead,
# the output file will just be filled up with the remaining pages of
# the longer input file.
#
# Internally, 'pdftk' does the work, and this is just a script
# wrapping around 'pdftk'.
#
###"
output_file_default='/dev/stdout'
errmsg() {
if [ "$#" -ge "1" ]; then
msg="$1"
else
msg="$0: Unspecified error."
fi
echo "${msg}" >> /dev/stderr
}
exiterror() {
if [ "$#" -ge "1" ]; then
msg="$1"
else
msg="$0: Unspecified error."
fi
if [ "$#" -ge "2" ]; then
exitcode="$2"
else
exitcode=2
fi
errmsg "${msg}"
exit "${exitcode}"
}
printusage() {
echo "Usage:"
echo " $0 <odd_pages_pdf_input_file> <even_pages_pdf_input_file> [<pdf_output_file> [<additional_pdftk_options>]]"
echo "(<pdf_output_file> defaults to '${output_file_default}')"
echo "For example, specify 'verbose' as an additional pdftk-option to get verbose output."
}
printextendedhelp() {
echo "${extendedhelp}"
}
if [ "$#" -lt "2" ]; then
errmsg "$0: Error: Too few arguments specified."
errmsg ""
errmsg "$(printusage)"
errmsg ""
errmsg "=== Extended information on this software: ==="
errmsg ""
errmsg "$(printextendedhelp)"
errmsg ""
exiterror "$0: Aborting, since too few arguments specified." 1
fi
oddinput_file="$1"
eveninput_file="$2"
shift
shift
if [ "$#" -ge "1" ]; then
output_file="$1"
shift
else
output_file="${output_file_default}"
fi
pdftk A="${oddinput_file}" B="${eveninput_file}" shuffle A B output "${output_file}" "$@"
exitcode_pdftk="$?"
if [ "${exitcode_pdftk}" -ne 0 ]; then
errmsg "$0: Error: The run of 'pdftk' produced an error. See above error message from the call to 'pdftk' for details."
fi
exit "${exitcode_pdftk}"
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