math

#!/bin/bash
#
# quick math between 2 images
#

readarray -t <<< ${NAUTILUS_SCRIPT_SELECTED_FILE_PATHS}
path=$(dirname "${MAPFILE[0]}")
file=$(basename "${MAPFILE[0]}")

if [[ $file == *.nii ]]
then
    outname="${file/.nii/"_$op.nii"}"
else
    outname="${file/.nii.gz/"_$op.nii.gz"}"
fi

# built input python list from selected files & remove last empty element
unset MAPFILE[-1]
printf -v FILESET " %s" "${MAPFILE[@]}"
CHARSET=({a..z})

# loop in the array and ad dprefix for ID
## now loop through the above array
for i in "${!MAPFILE[@]}"; do
	path=$(dirname "${MAPFILE[$i]}")
	file=$(basename "${MAPFILE[$i]}")
	MAPFILE[$i]="\n\t${CHARSET[$i]} =  ${file}"
done
assigned=${MAPFILE[@]}

printf -v finaltext "%s\n" "Input formula in python-numpy style using letters as placeholders for the files: \n\n${assigned[@]}"
exprs=$(zenity \
	--forms \
	--title="Math operation" \
	--text="$finaltext" \
	--add-entry="Numpy expression" \
	--add-entry="Save as" \
	)
readarray -d "|" -t <<< ${exprs}
exprs=${MAPFILE[0]}
outname=${MAPFILE[1]}
if [ -z $outname ]; then outname="result.nii.gz"; fi
SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )


# Execute the Python script and capture its output and error
#python3 $SCRIPT_DIR/lib/neuronautilus_evalexprs.py -ex "$exprs" -o ${path}/${outname} -vars $FILESET
py_output=$(python3 "$SCRIPT_DIR/lib/neuronautilus_evalexprs.py" -ex "$exprs" -o "${path}/${outname}" -vars $FILESET 2>&1)


if [[ -f "${path}/${outname}" ]]; then
    notify-send "Done: $outname"
else
# Check exit code of the Python script
if [ $? -ne 0 ]; then
    # Display error in xterm
    xterm -hold -e "bash -c 'echo Error occurred:; echo \"$py_output\"'"
fi
fi