#!/bin/sh
##
## SCRIPT: forLoop_displayImgsInFile.sh
##
## PURPOSE: For a given
##          1) image-viewer command string (program and some arguments)
##          and
##          2) a text-file name (in which the file contains the
##             fully-qualified names of image files).
##          this script uses a 'for' loop to show each of the
##          image files via the image-viewer command string.
##
##          It is assumed that the image-viewer works such that
##          when the user closes the image-viewer window, the
##          next image is shown.
##
## CALLED BY: a 'wrapper' Tk script:
##            find_and_imageViewer_FrontEnd.tk.
##
##+#######################################################################
## Created: 2013dec12 For use in a calling shell script:
##                       getImages_andCountPrintOrView.sh
##                    which in turn, is called by a 'wrapper' Tk script:
##                       find_and_imageViewer_FrontEnd.tk.
## Changed: 2014apr25 Add TOTALfiles and CNT variables, and add
##                    an 'echo' of those numbers to stdout.
##+#######################################################################

## FOR TESTING: (show statements as they execute)
#  set -x

##+##########################################################
## Put the 2 arguments into variables with descriptive names.
##+##########################################################

IMGVIEWER="$1"
TEMPFILE="$2"

##+##########################################################
## Get the number of files in file $2.
##+##########################################################

TOTALfiles=`cat "$TEMPFILE" | wc -l`

##+##########################################################
## Initialize an image count variable.
##+##########################################################

CNT=1

##+######################################################
## Use the image-viewer program (and any parms that are to
## be used with it) to show each of the image files whose
## names are in $TEMPFILE.
##+######################################################

for FILENAME in `cat  "$TEMPFILE"`
do
   echo "Showing $CNT of $TOTALfiles."
   $IMGVIEWER "$FILENAME" 2> /dev/null
   CNT=`expr $CNT + 1`
done