debug() buffer shows wrong function

[PeterPavicic]

I encountered this issue after debugging a nested function in an apply loop, as recreated below.

After running apply(..., FUN = foo), the debug buffer which opens will always show foo() being debugged, even though the R is correctly debugging another function (bar() in the provided example).

This issue persists whether or not the debug buffer is closed after debugging foo().

foo <- function(n) {
  print("in foo()")
  resultFoo <- bar(2 * n)

  resultFoo
}

bar <- function(n) {
  print("in bar()")
  resultBar <- 3 * n

  resultBar
}

debug(foo)

apply(matrix(1:3, ncol = 1), MARGIN = 1, FUN = foo) # debugging buffer opened

# go through debugging and close debugging buffer

undebug(foo)
debug(bar)

bar(2) # debugging buffer for foo() opens up

[jalvesaq]

The debugging functionality in R.nvim is limited and intended to be temporary. We are waiting until a debug adapter plugin is written for R. Please, see:

• Remove support for debugging R functions? #8
• DAP for R #79
• Thoughts on Ark / ark.nvim #363

However, if anyone wants to improve the function find_func (lua/r/debug.lua), a pull request will be welcome.

[jrwishart]

I'm unable to reproduce this. My steps were

1. Create tmp.R
2. Populate tmp.R with the code above.
3. Save the tmp.R buffer
4. In the R console within nvim type source('tmp.R')
5. Debugger steps through foo three times and once through bar as expected.

[PeterPavicic]

I meant that the buffer which shows the debugging was faulty, the debug functionality always worked correctly (I suppose my wording could have been more clear in the issue).

I tried sourcing the entire file as well, in which case the debug buffer does not show up at all. I'm not sure how this was at the time of creating the issue, but the debugging buffer only shows up after line 24 is run.

The issue can still be replicated on my machine by running each line separately, with either <localleader>l or <localleader>d.

See example below, which I got by:

1. starting R
2. Using <localleader>d repeatedly to get to line 17
3. Go through debugging
4. Using <localleader>d repeatedly to get to line 24