How to select different choices in nested choice nodes

[Bekaboo]

I have the following snippet for Python logs:

local fmtad = ls.extend_decorator.apply(fmta, {
  repeat_duplicates = true,
})

ls.snippet(
  {
    trig = 'lconf',
    desc = 'Config logging',
  },
  fmtad('logging.basicConfig(<out>, level=<level>)', {
    out = c(1, {
      fmtad('stream=<fd>', {
	fd = c(1, {
	  i(nil, 'sys.stdout'),
	  i(nil, 'sys.stderr'),
	}),
      }),
      fmtad('filename=<fname>, filemode=<fmode>', {
	fname = i(1, 'fname'),
	fmode = i(2, 'a'),
      }),
    }),
    level = c(2, {
      i(nil, 'logging.DEBUG'),
      i(nil, 'logging.INFO'),
      i(nil, 'logging.WARNING'),
      i(nil, 'logging.ERROR'),
      i(nil, 'logging.CRITICAL'),
      i(nil, 'logging.NOTSET'),
    }),
  })
),

I want to first set the <out> placeholder, where I can choose whether to write log to the console or a log file; inside the "writing to console" choice, there's a second layer of choice between "stderr" and "stdout".

However, after I expand the snippet, I am only able to select between "sys.stdout" and "sys.stderr" (the inner choice) but not the outer choice between writing to a file or console (stream).

I think the correct behavior should be as follows:

1. After expanding the snippet, luasnip should select the range of the out choice, aka out node, enabling users to select between "stream=..." and "filename=..., filemode=..."
2. Then, after pressing tab, the cursor should jump to the inner node (fd or fname), if it's fd, then the user should be able to select the inner choice node.
3. Continue with other node...

What do you think?

[L3MON4D3]

Oh I'm sorry, I think I had a reply ready and forgot to finally send it.
I think this case specifically, and the problem in general can also be fixed by adding an insert code s.t. there is a stop only inside the outer choiceNode.
In your case, fd has to be a snippetNode which has an i(1) followed by the choiceNode you already have

Sorry for the late reply😅

[Bekaboo]

Never mind! I appreciate your help and your awesome work on LuaSnip. Will try it this weekend.

[Bekaboo]

Hi, I tried this following your hint, but I don't get the default text 'sys.stdout' or 'sys.stderr' for the <fd> placeholder after expanding the snippet:

And there's no way to cycle in the inner choice node between 'sys.stdout' and 'sys.stderr'. Now, when I press <C-n> or <C-p> (mapped to ls.change_choice()), the outer choice node is changed, i.e. cycling between stream=... and filename=..., filemode=..., which is expected, but after pressing <Tab> brings me directly to the next jump point level=... , instead of the inner node (the sys.stdout/stderr node).

Here's what I tried:

local fmtad = ls.extend_decorator.apply(fmta, {
  repeat_duplicates = true,
})

s(
  {
    trig = 'lconf',
    desc = 'Config logging',
  },
  fmtad('logging.basicConfig(<out>, level=<level>)', {
    out = c(1, {
      fmtad('stream=<fd>', {
	fd = sn(
	  1,
	  i(1),
	  c(1, {
	    i(nil, 'sys.stdout'),
	    i(nil, 'sys.stderr'),
	  })
	),
      }),
      fmtad('filename=<fname>, filemode=<fmode>', {
	fname = d(1, function()
	  return sn(nil, {
	    i(
	      1,
	      string.format(
		'%s.log',
		vim.fn.fnamemodify(vim.api.nvim_buf_get_name(0), ':t:r')
	      )
	    ),
	  })
	end),
	fmode = i(2, 'a'),
      }),
    }),
    level = c(2, {
      i(nil, 'logging.DEBUG'),
      i(nil, 'logging.INFO'),
      i(nil, 'logging.WARNING'),
      i(nil, 'logging.ERROR'),
      i(nil, 'logging.CRITICAL'),
      i(nil, 'logging.NOTSET'),
    }),
  })
)

[L3MON4D3]

Seems like there are just 2 small mistakes, <fd> is missing the braces around the nodes, and i and c both have jump-index 1.

	s(
  {
    trig = 'lconf2',
    desc = 'Config logging',
  },
  fmtad('logging.basicConfig(<out>, level=<level>)', {
    out = c(1, {
      fmtad('stream=<fd>', {
	fd = sn(
	  1, {
	  i(1),
	  c(2, {
	    i(nil, 'sys.stdout'),
	    i(nil, 'sys.stderr'),
	  })
  }
	),
      }),
      fmtad('filename=<fname>, filemode=<fmode>', {
	fname = d(1, function()
	  return sn(nil, {
	    i(
	      1,
	      string.format(
		'%s.log',
		vim.fn.fnamemodify(vim.api.nvim_buf_get_name(0), ':t:r')
	      )
	    ),
	  })
	end),
	fmode = i(2, 'a'),
      }),
    }),
    level = c(2, {
      i(nil, 'logging.DEBUG'),
      i(nil, 'logging.INFO'),
      i(nil, 'logging.WARNING'),
      i(nil, 'logging.ERROR'),
      i(nil, 'logging.CRITICAL'),
      i(nil, 'logging.NOTSET'),
    }),
  })
)

works correctly on my end, although it seems like it breaks on current master, you'll have to use #1137 :|
(the issue is the c(x, {sn(y, {d(z, ...)})})-construct)

[Bekaboo]

Thanks!