Execute a shell command and emit events triggered by stdOut

[hschneider]

Is your feature request related to a problem? Please describe.
When executing long-running shell commands, it is not possible to track progress. even if the command sends progress info via stdOut. We can display an infinite progress bar or another indicator to the user, but there is no real live-info.

Describe the solution you'd like

• Each data sequence terminated with a linefeed, coming from stdOut is read into a buffer.
• Next a JS event is triggered in the frontend, called e.g. progress.
• This event receives the buffered, raw data as a string for further processing.
• The buffer is cleared and the next line is read from stdOut.
• Loop until command terminates.
• When the command has been terminated an additional event called progress_end could be triggered.

Describe alternatives you've considered
No alternatives, as far as I can see ....

[JustPilz]

https://neutralino.js.org/docs/api/os/#osspawnprocesscommand-cwd

But curl push progress data in stdErr

[hschneider]

Right, so the same for stdErr would be useful, maybe the events should be better named cmd_stdout and cmd_stderr triggered line by line and cmd_start and cmd_end triggered before start and after end of the external process.

[hschneider]

Ooops - missed this one: os.spawnProcess(command, cwd)
@JustPilz Thanks for the hint.
Think we can close this :-)