Granted, this is a rather simplistic question but I’ll ask it nonetheless: René, in your opinion, could this also be used to import tags and ratings from a digiKam database? I’m hoping that I could take advantage of your heavy lifting and just drop in the references to digikam accordingly. Would this be a waste of time or, is it feasible?
> On 30 Jan 2017, at 09:43, René Seindal <r...@seindal.dk> wrote:
>
> Hi
>
> I found a solution, even if its not exactly obvious.
>
> In the main loop of my script, I do
>
> progress.percent = count/total
> dt.gui.selection()
> if cancelled then break end
>
> That does it.
>
> The darktable.gui.selection function is marked as implicit_yield so it gives
> the gui a chance to update, so the progress bar ticks along and if you click
> the cancel job button, the variable cancelled is true afterwards, and the
> loop breaks.
>
> I've tried quite a few other things.
>
> I tried using
>
> coroutine.yield('WAIT_MS', 10)
>
> to put in a delay and leave time for the gui to run, but it gives me a run
> time error:
>
> LUA ERROR : attempt to yield across a C-call boundary
>
> I haven't quite understood why.
>
> I tried with the undocumented
>
> dt.control.sleep(10)
>
> and nothing. If I increase the delay to 1000ms the progress bar updates, but
> of course the script is very very slow that way.
>
> I tried to open a file that's always readable, like /dev/zero, and use
>
> dt.control.read(file)
>
> but that did nothing either.
>
> Going through the documentation systematically, I found dt.gui.selection()
> which implicitly yields and that does the trick.
>
> Its totally not obvious but it works.
>
> René
>
>
> On 2017-01-30 14:02, Christian Kanzian wrote:
>> Hi,
>>
>> I'm not familar with programming and it is often hard for me to
>> distinguish between LUA core functions and darkable LUA API. You have to
>> look at LUA docs as well [0].
>>
>> Am 2017-01-30 12:34, schrieb René Seindal:
>>> On 2017-01-30 12:28, Tobias Ellinghaus wrote:
>>>> Am Montag, 30. Januar 2017, 12:04:03 CET schrieb René Seindal:
>>>>> Hi
>>>>>
>> [...]
>>>
>>> I have put in a progress bar (background job) but the progress bar
>>> doesn't update and the cancel button doesn't work, because I can't
>>> find a way to hand off control to the gui to update, while looping
>>> through the images, looking stuff up in the other sqlite3 database.
>>
>> From your script
>>> progress.percent = total / count
>>
>> The API [1] says the value should be between 0 and 1. So I think this
>> should look like:
>> progress.percent = count / total
>>
>> I think it is not enough to break the loop. Also you need to set the
>> job.valid to false to cancel it, like the script which Tobias mentioned.
>>
>> Christian
>>
>> [0] https://www.lua.org/manual/5.3/
>> [1] https://www.darktable.org/lua-api/ar01s02s30.html.php
>
>
> --
> René Seindal - r...@seindal.dk <mailto:r...@seindal.dk>
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