Sati :
I have a python program that customizes the page number of a pdf file.
Its usage is like so:
usage: pagelabels [-h] [--outfile out.pdf] [--delete | --update]
[--startpage STARTPAGE]
[--type {arabic,roman lowercase,roman uppercase,letters lowercase,letters uppercase}]
[--prefix PREFIX] [--firstpagenum FIRSTPAGENUM]
[--load other.pdf]
file.pdf
Add page labels to a PDF file
I have written a wrapper shell script to save up on typing when calling pagelabels above.
#!/bin/bash
# Wrapper for `addpagelabels.py`.
display_usage() {
echo "Wrapper for addpagelabels.py"
echo -e "\nUsage: <inputpdf> <startpage> <type> <firstpagenum>\n"
echo -e "<type>:\n a=arabic;\n r=roman lowercase;\n R=roman uppercase;\n l=letters lowercase;\n L=letters uppercase.\n"
echo "Output file would be filename_toc.pdf"
}
if [ $# -eq 0 ]; then
display_usage
exit 1
else
a='arabic'
r='roman lowercase'
R='roman uppercase'
l='letters lowercase'
L='letters uppercase'
python3 -m pagelabels --startpage $2 --type $3 --firstpagenum $4 --outfile ${1%%.*}_toc.pdf $1
exit 0
fi
The string variables defined in the script cannot be invoked by the third argument a below.
$ bash pdfpgn.sh dtjl.pdf 2 a 297
usage: addpagelabels.py [-h] [--delete] [--startpage STARTPAGE]
[--type {arabic,roman lowercase,roman uppercase,letters lowercase,letters uppercase}]
[--prefix PREFIX] [--firstpagenum FIRSTPAGENUM]
[--outfile out.pdf]
file.pdf
addpagelabels.py: error: argument --type/-t: invalid choice: 'a' (choose from 'arabic', 'roman lowercase', 'roman uppercase', 'letters lowercase', 'letters uppercase')
What is the right way to do this?
Charles Duffy :
Consider an associative array (bash's equivalent to a Python dict, though its keys and values can only be strings).
Consider:
#!/bin/bash
case $BASH_VERSION in ''|[123].*) echo "ERROR: Bash 4.0+ required" >&2; exit 1;; esac
declare -A type_abbreviations=(
[a]='arabic'
[r]='roman lowercase'
[R]='roman uppercase'
[l]='letters lowercase'
[L]='letters uppercase'
)
filename=$1
startpage=$2
type=$3
startpagenum=$4
[[ ${type_abbreviations[$type]} ]] && type=${type_abbreviations[$type]}
exec python3 -m pagelabels \
--startpage "$startpage" \
--type "$type" \
--firstpagenum "$startpagenum" \
--outfile "${filename%%.*}_toc.pdf" \
"$filename"
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