Bug with pandoc.list and one sub-element

[mathematicalcoffee]

pandoc.list doesn't return the properly indented list if a sub-list has only one element.

Example

Suppose I want to make the following list:

• one
  • two

I'd do

pandoc.list(list('one', list('two')))

However this returns

* one 
* list("two") 

If however the sublist has more than one element, everything works fine:

pandoc.list(list('one', list('two', 'three')))

* one 
    * two 
    * three  

Fix

I believe the error is in this line of pandoc.list.return.

    if (length(elements[[i]]) == 1) { # <--- THIS LINE
        paste0(paste(rep(' ', indent.level * 4), collapse = ''), marker[i-i.lag], elements[i])
    } else {
    ...

Note that in the case of the element list('two'), elements[i] has length 1 but the string representation of elements[i] is list("two").

If you change it to:

if (length(elements[[i]]) == 1 && !is.list(elements[[i]])) {

then all works as expected.

I am unsure if this breaks some other use case, though.

[daroczig]

Thank you very much for the detailed issue, I have merged your proposed fix.
To be honest, I have never used pandoc.list directly in the last 10 months for sure, always called pander instead which resolved this issue by analyzing the class of each part before applying any of the pandoc.* functions. E.g. (before fix):

> pander(list('one', list('two')))


  * one
  *

      * two


<!-- end of list -->

But that was a bug for sure, thanks again!