pqnext

#!/bin/bash
## pqnext
## Copyleft JPmicrosystems 07/24/2015
# ## Last Modified 07/22/2018
## Get next print job number
## Usage is: pqnext [-q]
## If -q (quiet) is specified, nothing is displayed.
## The result is just copied to the clipboard
## If xclip is not installed, specifying -q is an error
##
## This version gets the last (largest) file number
## and uses its length in digits to determine the length it should return
## with left-zero padding
## Strips off .ps and .pdf extensions, if present, before finding the current largest file number
## If the next file number overflows the length of the previous one (99 -> 100)
## It will return the longer file number. This works, but messses up the print queue file order
## If the largest file number doesn't have the same number of digits as all the rest, then
## The next one returned by pqnext won't either - which also messes up the print queue file order
## 
## If the print queue is empty, pqnext will return a 2-digit file name of 01

function mypath () {
  ## Get the real path of the calling script
  ##  From: https://stackoverflow.com/questions/59895/getting-the-source-directory-of-a-bash-script-from-within/246128#246128
  my_path="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd)"
}

##################################################################
##  Main Program                                                ##
##################################################################

##source $HOME/bin/bash_trace ## debug - TRACE

script_name="pqnext"
mypath  ## Get the path to this script
script_path="${my_path}"  ## make sure we can find other scripts
yopt="--title ${script_name} --center --on-top"  # yad common options
##dsptime_short=5  ## yad timeout for normal messages
dsptime_long=10  ## yad timeout for exception messages
dsptime_error=30 ## yad timeout for error messages

gui=1 ## pop-ups enabled
if [[ "$1" == "-q" ]]
then
  gui=0 ## pop-ups disabled (for use when called by other scripts)
  shift
fi

config="${HOME}/.duplexpr"

## Access the duplexpr configuration file
if [[ ! -r  "${config}" ]]
then
  (( gui )) && yad ${yopt} --title="${script_name}" --info --button=gtk-ok:0 --text="Missing config file ${config}" \
  --width=220 --timeout="${dsptime_error}"
  exit 1
fi

source "${config}"
if (( $? ))
then
  (( gui )) && yad ${yopt} --info --button=gtk-ok:0 --text="Bad config file .duplexpr" --width=220 --timeout="${dsptime_error}"
  exit 1
fi

cd "${pq}"
if (( $? ))
then
  (( gui )) && yad ${yopt} --info --button=gtk-ok:0 --text="Can't access Print Queue [$pq]" --width=220 --timeout="${dsptime_error}"
  exit 1
fi

## Get all the numeric-only file names (including those with extensions of ".ps" or ".pdf"
## strip off the leading "./" returned by find
## sort numerically and just keep the last (largest) one
next="$(find . -name '*' -regex '^\.\/[0-9]+\(\.pdf\|\.ps\|\.PS\|\.PDF\)?$' | sed -re 's/^\.\///' | sort -n | tail -1)"
next="${next%%.*}"  ## strip off extension if present

## Handle empty print queue (with no numeric file names in it)
[[ ! $next ]] && next="00"  ## The number of zeroes determines the length of the new file number returned by pqnext

## Set the length in digits to use to the same as the length of the file number we just found
digits="${#next}"
## Get rid of leading zeroes so we can increment it as a decimal integer
## If we don't, a leading zero tells bash to use octal
next=$(sed -re 's/^0*([0-9]+)/\1/' <<< ${next})

(( next++ ))  ## Increment to get next file number

## No statistics if print queue is empty (if the next number is 1)
if [[ ${next} > 1 ]]
then
  stats="\n\n$(cd ${pq}; "${script_path}/mprb" -i * | tail -3)"
else
  stats=""
fi

## Put the leading zero back on if needed
next="$(printf "%0${digits}d" ${next})"

## If xclip is installed, then
## put the file number into the clipboard so it can be manually pasted into a file name dialog
hash xclip 2>/dev/null
rc=$?
(( rc )) && (( ! gui )) && exit 1  ## quiet mode is useless without xclip
(( ! rc )) && echo -n ${next} | xclip -se c

text="Queue [${pq}]\n\nNext Print File Is ${next}${stats}"

(( gui )) && yad ${yopt} --text="${text}" --fixed --width=220 --height=120 \
--button=gtk-ok:0 --timeout="${dsptime_long}"

exit 0