Support ability to terminate previous invocation of command on new event

[F21]

It would be nice if there is an option to terminate the previous invocation of the command when the command is still executing and a file changes. This would be extremely useful when the command is a task that takes a while to complete and we do not wish to wait for it to finish and want to invoke the command immediate again.

[ysmood]

@F21 Maybe you should give this tool a try: https://github.com/ysmood/gokit

Same for issue #58

[abdullah2993]

@F21 this can be achieved by using a shell script.
Here is an example:

#!/bin/sh
if [ -f /.pid ]; then
    kill $(cat /.pid)
fi
go install .
server &
echo $! > /.pid

just make sure the .pid file is outside of your watched directory otherwise it will go into an infinite loop

[ysmood]

@abdullah2993 That's not enough, you also need to kill all the subprocesses it creates, or you gonna have leaking issue.
Secondly, the shell script is not cross-platform.

[abdullah2993]

@ysmood with the script you can kill any(all) processes, in the given example we are only creating a server process and we are killing it on restart. I do agree that this is not a cross-platform solution but you can do the same with a .bat file.

[ysmood]

@abdullah2993 at least you need to modify your script like this:

kill -$(cat /.pid)

The minus before the dollar sign is the point.

[abdullah2993]

@ysmood you are right. should be kill -- -$(cat /.pid)