Challenge: who can background this shell command?

Dar Scott Consulting dsc at swcp.com
Thu Aug 1 14:27:00 EDT 2019


I am not familiar with hugo. Do you type a ^c to shut down hugo server? In that case you might want to consider open for update. 

> On Aug 1, 2019, at 12:19 PM, David Bovill via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> OK - I managed to get it to work with:
> 
>   - open process "/usr/local/bin/hugo server" for read
> 
> which I did not think would work due to the two word shell command.
> 
> Timing was an issue - so I had to use the method found here (thanks Mark) -
> https://github.com/livecode/livecode/blob/develop/builder/installer_utilities.livecodescript
> -
> which uses a send in 20 milliseconds when there is a timeout. basically it
> is complex timing logic, but more direct and probably robust than using a
> bunch of shell commands we put into the background. Still we have tow
> methods that work - restores my faith in the flexibility of Livecode!
> 
> On Thu, 1 Aug 2019 at 17:15, dsc--- via use-livecode <
> use-livecode at lists.runrev.com> wrote:
> 
>> I feel foolish. From the dictionary:
>> 
>> 
>> Note: On OS X systems, you can use the open process command to start up an
>> application, but not a Unix process. To work with a Unix process, use the
>> shell func instead.
>> 
>> When I saw this in the Dictionary, I thought, "Oh, when did this break?"
>> 
>> I should have thought, "Oh, yeah?"
>> 
>> 
>>> On Aug 1, 2019, at 10:03 AM, Dar Scott Consulting via use-livecode <
>> use-livecode at lists.runrev.com> wrote:
>>> 
>>> So, this is a documentation problem?
>>> 
>>>> On Aug 1, 2019, at 9:27 AM, Mark Waddingham via use-livecode <
>> use-livecode at lists.runrev.com> wrote:
>>>> 
>>>> On 2019-08-01 17:12, David Bovill via use-livecode wrote:
>>>>> OK - so I have it working by writing to a temporary file.
>>>>> Trying to redirect the output to stdout - so that shell() return the
>>>>> information of the background process - but this freezes:
>>>> 
>>>> Okay so given you want to read/write to the process you launched it
>> seems...
>>>> 
>>>> What's wrong with open process? The *only* difference between open
>> process
>>>> on macOS compared to Linux (and Windows) is that if you try and open
>> process
>>>> an app-bundle (i.e. something ending with '.app') it will do the same as
>>>> launch (as .app bundles aren't executables).
>>>> 
>>>> The installer uses open (elevated) process to communicate with an
>> instance
>>>> of itself with elevated permissions. You can see the code for that here:
>>>> 
>>>> <
>> https://github.com/livecode/livecode/blob/develop/builder/installer_utilities.livecodescript
>>> 
>>>> 
>>>> The key routines are installerRun and installerMonitor (the latter is
>> used
>>>> to poll every 20 milliseconds to check if the child process has
>> anything to
>>>> say).
>>>> 
>>>> Warmest Regards,
>>>> 
>>>> Mark.
>>>> 
>>>> --
>>>> Mark Waddingham ~ mark at livecode.com ~ http://www.livecode.com/
>>>> LiveCode: Everyone can create apps
>>>> 
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>>> 
>>> 
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