Feature request: Add a flag that only restarts the program when a file is updated.

[Stromdahl]

Feature Request:

Add a flag that only restarts the program when a file is updated.

Description:

Developing a program that's intended to exit can be challenging with Runar, as it currently restarts the program every time. This can lead to repetitive output and unnecessary restarts.

Example:

$ runar -r -f myscript.sh -- ./myscript.sh 
START
PROCESSING...
END
START
PROCESSING...
END
START
PROCESSING...
END
START
PROCESSING...
END
START
...

Proposed Solution:

To address this, I propose introducing a -w (or -wait) flag to Runar. When this flag is used, Runar would only initiate a restart when a file update is detected. This feature would greatly improve the development experience.

Proposed Example:

# With the proposed -w flag
$ runar -r -w -f myscript.sh -- ./myscript.sh 
START
PROCESSING...
END
<runar> child process exited with  0... Runar is now waiting for a file update...

Benefits:

• Enhanced Development Experience: The new -w flag would prevent unnecessary restarts, making it easier to work on programs meant to exit.

Implementation Note:

As for implementation, Runar would need to monitor the specified file for changes and trigger a restart only when updates occur.

Additional Notes:

• This feature could significantly reduce repetitive output during development.
• The proposed flag name is -w, but you could consider alternatives...