The pipeline used to retrieve the WID of the active window returns a bad WID because xprop returns several hex numbers and ".*" in the sed regex is greedy. For instance, running "xprop -root -notype _NET_ACTIVE_WINDOW" gives me:
_NET_ACTIVE_WINDOW: window id # 0x1a0003d, 0x0
Filtering this output with the sed substitution then gives "0x0", since the first ".*" matches everything up to *the last* hex number.
The fix is simply to grep hex numbers instead of using a sed substitution, and then choose the first one.
- compton-trans: Allow reading opacity value from positional arguments,
like the version in master branch.
- compton-trans: Quit when meeting an unrecognized option.
Rewrite a part of compton-trans in order to provide more friendly
error messages, to support window title that contains spaces, and to
limit the number of xwininfo calls to a constant. Not much tests are
done, and I don't know bash well, so bugs could very well exist.
