Wrapper for `sxiv -`

sxiv.sh

#!/usr/bin/env bash
# When used as drop-in script, sxiv can now also read an image from stdin
# through `sxiv -`. Would've solved xyb3rt/sxiv#250.
# To use: write to /usr/local/bin/sxiv and chmod a+x.

# Note: this doesn't guarantee the input args are correct, it just separates
# files from options.
TEMP=$(getopt -o "A::abce::fG::g::hin::N::opqrS::s::tvZz::" -n sxiv -q $@)

if [ $? -ne 0 ]; then
    # If things go south, let's use the actual sxiv to handle any problems with
    # the input args.
    exec /usr/bin/sxiv $@
fi

eval set -- "$TEMP"
unset TEMP

opts=()

while [ "$1" != "--" ]; do 
    opts+=("$1")
    shift
done
shift

files="$@"

# When we encounter a dash, we store stdin as a temporary file in order for sxiv
# to read it. There is only one stdin, so we allow for only one input file.
#
# We preserve the order of the files through an indexed for loop.
for i in ${!files[@]}; do
    if [ "${files[$i]}" == "-" ]; then
        tempfile="$(mktemp)"
        cp /dev/stdin "$tempfile"
        files[$i]="$tempfile"
        break
    fi
done

/usr/bin/sxiv $opts $files
if [ -f "$tempfile" ]; then
    rm "$tempfile"
fi