Just simple QT5/QML photo viewer to be started from command line (or mc) to view all photos in folder. Created due to lack anything like this for OSX... and shared on github just for fun :)
Usage: spv (open folder selection dialog) spv /path/to/folder/with/images (open first image in folder) spv /path/to/any/jpeg/image.jpg (open this image in folder)
LEFT/RIGHT keys used to go forward/backward
UP/DOWN keys to go to first/last photo
SPACE key to toggle fit to window / original size
ESCAPE key to exit