user/combine_pdfs.sh

   1 #!/usr/bin/env bash
   2 # Desc: Combines PDF files into a single PDF file
   3 # Depends: pdftk 2.02-5 ( https://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/ )
   4 # Version 0.0.1
   5
   6 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
   7 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
   8 must() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
   9 showUsage() {
  10     # Desc: Display script usage information
  11     # Usage: showUsage
  12     # Version 0.0.2
  13     # Input: none
  14     # Output: stdout
  15     # Depends: GNU-coreutils 8.30 (cat)
  16     cat <<'EOF'
  17     USAGE:
  18         combine_pdfs.sh [FILE output] [FILES input...]
  19
  20     EXAMPLE:
  21       combine_pdfs.sh output.pdf input1.pdf input2.pdf
  22       combine_pdfs.sh output.pdf input*.pdf
  23 EOF
  24 } # Display information on how to use this script.
  25 checkDepends() {
  26     if ! command -v pdftk 1>/dev/random 2>&1; then
  27         showUsage;
  28         die "FATAL:Missing pdftk."; fi;
  29 }; # Check dependencies
  30 checkArgs() {
  31     local narg;
  32
  33     # Check arguments
  34     narg=0;
  35     for arg in "$@"; do
  36         #yell "DEBUG:Checking argument:$arg";
  37         if [[ $narg -le 0 ]]; then
  38             if [[ ! -f "$arg" ]]; then
  39                 ((narg++)); continue;
  40             else
  41                 ## Get permission to overwrite existing output file
  42                 yell "WARNING:Overwrite output file \"$arg\"? (y/n)";
  43                 read -r prompt;
  44                 case "$prompt" in
  45                     "y" | "yes" | "Yes" | "YES" )
  46                         ;;
  47                     "n" | "no" | "No" | "NO" )
  48                         showUsage; die "FATAL:Aborted.";
  49                         ;;
  50                     *)
  51                         showUsage; die "FATAL:Invalid response.";
  52                         ;;
  53                 esac;
  54             fi;
  55         fi; # handle first arg
  56
  57         if [[ ! -f "$arg" ]]; then
  58             showUsage; die "FATAL:File does not exist:$arg"; fi;
  59         ((narg++));
  60     done;
  61
  62     return 0;
  63 };
  64 combinePDFs() {
  65     # Desc: Combines PDFs and writes to output PDF file
  66     # Depends: pdftk 2.02-5
  67     local cmd path_fo;
  68     local -a paths_fi;
  69
  70     # Save output file path
  71     path_fo="$1";
  72
  73     # Form array of input file paths
  74     paths_fi=("$@");
  75     unset 'paths_fi[0]'; # discard first path which is output file
  76
  77     # Form command array
  78     cmd+=("pdftk"); # executable
  79     cmd+=("${paths_fi[@]}"); # input file paths
  80     cmd+=("cat" "output");
  81     cmd+=("$path_fo");
  82     #yell "DEBUG:cmd:$(declare -p cmd)";
  83     #yell "DEBUG:cmd:${cmd[*]}";
  84
  85     # Execute command array
  86     "${cmd[@]}";
  87 }; # Combines PDFs and writes to output PDF file
  88 main() {
  89     #yell "DEBUG:$(args=("$@"); declare -p args)";
  90     checkDepends;
  91     checkArgs "$@";
  92     combinePDFs "$@";
  93     exit 0;
  94 }; # main program
  95
  96 main "$@";
  97
  98 # Author: Steven Baltakatei Sandoval
  99 # License: GPLv3+
 100
 101 # # Copyright notices
 102
 103 # pdftk port to java 3.2.2 a Handy Tool for Manipulating PDF Documents
 104 # Copyright (c) 2017-2018 Marc Vinyals - https://gitlab.com/pdftk-java/pdftk
 105 # Copyright (c) 2003-2013 Steward and Lee, LLC.
 106 # pdftk includes a modified version of the iText library.
 107 # Copyright (c) 1999-2009 Bruno Lowagie, Paulo Soares, et al.
 108 # This is free software; see the source code for copying conditions. There is
 109 # NO warranty, not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 110
 111