JezK

Edit File: ppmbrighten

#!/usr/bin/sh

# This is just for backward compatibility.  New applications should use
# 'pambrighten'.

# We don't try very hard to respond well to invalid syntax, because backward
# compatibility is mostly like existing, working applications.

pambrightenOpts=''
normalize='no'
expectValue='no'

for word in "$@"; do

if test "$expectValue" = 'yes'; then
        # This is the value of an option, like "40" in "-saturation 40"
        pambrightenOpts="$pambrightenOpts $word"
        expectValue='no'
    else
        # 'word_one_hyphen' is 'word' except if 'word' is a double-hyphen
        # option, 'word_one_hyphen' is the single-hyphen version of it.
        # E.g. word=--saturation word_one_hyphen=-saturation .
        word_one_hyphen=$(echo "$word" | sed s/^--/-/ )
    
        case $word_one_hyphen in
            -version )
                pambrighten -version; exit $?
                ;;
            -normalize|-normaliz|-normali|-normal|-norma|-norm|-nor|-no|-n)
                normalize='yes'
                ;;
            -*=*)
                pambrightenOpts="$pambrightenOpts $word"
                # This is an option with value such as "-saturation=40"
                ;;
            -*)
                pambrightenOpts="$pambrightenOpts $word"
                # Starts with hyphen, no equals sign, so the next word is the
                # option's value (note that the only valid ppmbrighten flag
                # option is -normalized, handled above).
                #
                # E.g. "-saturation 40"
                expectValue='yes'
                ;;
            *)
                # Not an option or option value - only non-option argument
                # ppmbrighten has is optional input file name
                infile="$word"
                ;;
                
        esac
    fi
done

if test "$normalize" = 'yes'; then
    pnmnorm -bsingle -wsingle -colorvalue -keephues $infile | \
        pambrighten $pambrightenOpts | ppmtoppm
else
    pambrighten $pambrightenOpts $infile | ppmtoppm
fi