On 2016-Jan-08, Christian wrote with possible deletions:
> I'm not a seasoned DT+LUA guy.
Nobody seems to be ;-) But I'm happy someone else also observes this
effect.
> The LUA API [0] tells that dt.collection only returns a numerical index
> not the image ID and filtering does not change the collection?
> What should be dt.collection for?
My understanding of the (not so good) documentation is this:
“`darktable.collection` Allows to access the currently worked on
images, i.e the ones selected by the collection lib.”
so this represents the collection [3]
“Filtering (rating etc) does not change that collection.”
Planily wrong, as can be observed by testing.
“`darktable.collection.#`”
The hash is a typo. AFAIK this is not at all valid Lua syntax.
“types.dt_lua_image_t”
Written the way it is, the documentation claims that this would be
the type of `darktable.collection`, which is wrong. If it was
true, one could access the `id` field [1]. But trying to do so
generates a Lua error:
field "id" not found for type dt_lua_singleton_image_collection
I have tried to find doc on `dt_lua_singleton_image_collection`,
but to no avail.
So I boldly assume that it is the type of the items contained in
`darktable.collection`
“Each image in the collection appears with a numerical index; you
can interate them using ipairs.”
This finally reveals that `darktable.collection` can be iterated
over [2]. As I've described earlier, it would be smarter to
return a table instead of assigning volatile and meaningless
numbers to the images.
Further testing with my previously posted Lua function `foo` gives me
the impression that the `id` field of items in `darktable.collection`
always have consecutive numbers, not necessarily starting with one.
It is a bug, is it?
Stefan
____________________
[0] http://www.darktable.org/lua-api/index.html.php#darktable_collection
[1] http://www.darktable.org/lua-api/ar01s02.html.php#types_dt_lua_image_t
[2] http://www.lua.org/manual/5.3/manual.html#pdf-ipairs
[3] http://www.darktable.org/usermanual/ch02s03s02.html.php
--
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