The previous behavior was incorrect because `if` was checking the return
status of the `[` command which was never going to be an error. `[`
seems to only return an error if no args are provided. This was
basically a useless use of `[` anyway since it was just meant as a
straight interpretation of command exit, something that `if` can do
itself.
Compare:
```sh
[ ]; echo ?=$?
[ /bin/false ]; echo ?=$?
if [ /bin/false ]; then echo this is the unintended bug; fi
if /bin/false; then echo this will not be printed; fi
```
Usage:
grimshot copy|save win|screen|area [FILE]
Troubleshoot:
grimshot check
Requirements:
- `grim`: screenshot utility for wayland
- `slurp`: to select an area
- `swaymsg`: to read properties of current window
- `wl-copy`: clipboard utility
- `jq`: json uliity to parse swaymsg output
- `notify-send`: to show notifications
Those are needed to be installed, if unsure, run `grimshot check`
Examples:
`grimshot copy win` - to copy current window
`grimshot save area` - to select area and save it to default file (Pictures/Grimshot-$datetime.png)
`grimshot save screen ~/screenshot.png` - to save screenshot under ~/screenshot.png
`grimshot` - usage
`grimshot check` - verify if tools are installed
