Transparency gets reset when the script is terminated.
Added command line option to set transparency strength without changing
the script.
Added support for multiple displays.
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
Sway has ability to apply transparency to arbitrary windows. This script
wires up this functional to one of popular use-cases from
i3+<compositor_name>.
Signed-off-by: Konstantin Kharlamov <Hi-Angel@yandex.ru>
