Log Message:
(devel/R-xfun) Updated 0.48 to 0.50

# CHANGES IN xfun VERSION 0.50

- The function `isFALSE()` has been removed from this package. The
  deprecation notice was given two years ago:
  https://yihui.org/en/2023/02/xfun-isfalse/

- Added a new function `tabset()` to represent a list with a
  tabset. The representation is similar to `str()`, but uses a visual
  form.

- Factored out the function `taml_load()` and exported it (TAML is a
  tiny subset of YAML). Also added a new function `taml_save()` to
  convert simple lists to YAML.

- The `print` argument of `record()` can accept non-function values
  now, in which case `print()` (or `show()` for S4 objects) will be
  used as the print function.

- The `record()` results can also be formatted to Markdown via
  `format(record(), to = 'markdown')`.

- Moved `knitr::combine_words()` into this package as
  `xfun::join_words()`. The former has become a simple wrapper of the
  latter.

- Similarly, moved `knitr::write_bib()` into this package as
  `xfun::pkg_bib()`.

- Moved the internal function `str_wrap()` from **knitr** and exported
  it as `xfun::str_wrap()`.

- Exported the internal `find_globals()` and `find_locals()`
  functions.

- `md_table()` escapes `|` in the table to `\|` instead of `|`
  now.

- `yaml_load(use_yaml = FALSE)` allows for indenting sub-fields by any
  number of spaces now (thanks, @J-Moravec, #95). Previously, one
  level of indentation must use exactly 2 spaces.

- `divide_chunk()` no longer requires every line of chunk options to
  be commented out when the engine uses a pair of comment delimiters
  (such as `/*` and `*/` for CSS) instead of a single comment
  character. It suffices to use the opening delimiter at the beginning
  and closing delimiter at the end, e.g.,

  ````md
  ```{css}
  /*| echo=FALSE,
      label='foo' */
  ```
  ````

  Previously, every line must be commented out like:

  ````md
  ```{css}
  /*| echo=FALSE, */
  /*| label='foo' */
  ```
  ````

# CHANGES IN xfun VERSION 0.49

- Added an argument `use_block = FALSE` to `protect_math()`. When
  `use_block = TRUE`, a `$$ $$` expression that spans across multiple
  lines will be protected in a code block.

- `protect_math()` will ignore `$ $` if there are backticks after the
  opening `$` or before the closing `$`, e.g., ``$`this is not
  math`$``.

- `protect_math()` allows for parentheses `()` around math expressions
  now, e.g., `($x$)` was previously not recognized but is recognized
  now (thanks, @AlbertLei, yihui/litedown#34).

- `record()` works with `quote()` now (thanks, @ben-schwen,
  yihui/litedown#38).

- `html_escape()` will not escape double quotes (i.e., convert `"`" to
  `"`) by default, and the conversion will be done only for
  `html_escape(attr = TRUE)`.

- The arguments `before` and `after` of `read_all()` can take
  functions of two arguments now, with the second argument being the
  content of each file.

- Added an argument `start` to `make_fence()`.