Log Message:
(devel/R-xfun) Updated 0.42 to 0.48

# CHANGES IN xfun VERSION 0.48

- Added utilities for HTML tags: `html_tag()`, `html_escape()`,
  `html_escape()`, and `html_view()`. Removed the soft dependency on
  the **htmltools** package accordingly.

- `base_pkgs()` is faster now: it calls
  `tools::standard_package_names()` if the function exists (R >=
  4.4.0), otherwise it just returns a constant vector of base package
  names (thanks, @arnaudgallou, #91).

- Added a function `mime_type()` to obtain the MIME types of files via
  `mime::guess_type()` if **mime** is installed, otherwise it will
  call `tools:::mime_type()`, and fall back to using a system command
  (e.g., `file --mime-type`) to obtain the types.

- Added a function `file_rename()` to deal with `file.rename()`
  failures by calling `file.copy()` (thanks, @Giqles @katrinabrock,
  rstudio/bookdown#804).

- `new_app()` will use `utils::browseURL()` to open the app if
  `options('viewer')` is not configured (thanks, @AlbertLei,
  yihui/litedown#29).

- Added a method `record_print.record_asis()` to return the object as is.

# CHANGES IN xfun VERSION 0.47

- Added functions `lazy_save()` and `lazy_load()` to save objects to
  files and lazy-load them.

- Fixed a bug in `record(dev = svglite::svglite)` that misplaced plots
  when low-level plot functions are used (thanks, @liao961120,
  yihui/litedown#17).

- Specified the lowest R version required (v3.2.0) for this package.

# CHANGES IN xfun VERSION 0.46

- `md_table()` should add a vertical ellipsis to row names when rows
  are truncated by the `limit` argument.

- `session_info()` recognizes Positron now (thanks, @chuxinyuan, #89).

# CHANGES IN xfun VERSION 0.45

- For `record()` with `verbose = 1` or `2`, invisible `NULL` is no
  longer printed.

- `Rscript_call()` will show the actual error message (if an error
  occurred) during calling the function in a new R session.

# CHANGES IN xfun VERSION 0.44

- Added a function `cache_exec()` to cache the execution of an
  expression either in memory or on disk. It is much more general and
  flexible than `cache_rds()`. For example, it supports custom
  reading/writing methods for cache files, and can load locally
  created variables in the expression while loading cache.

- Added an argument `cache` to `record()` to make it possible to enable caching.

- Added arguments `message` and `warning` to `record()` to decide
  whether messages and warnings should be recorded.

- Changed the default value of the argument `error` of `record()` from
  `FALSE` to `NA`. Now `FALSE` means to suppress error messages, and
  `NA` means to throw errors normally. This is for consistency with
  the `message` and `warning` arguments.

- Added an S3 generic function `record_print()`, which is similar to
  `knitr::knit_print()` but for the purpose of printing visible values
  in `record()`.

- The `record()` function gained new arguments `print` and
  `print.args` to support custom printing functions and arguments.

- Added a function `md_table()`, which is a minimal Markdown table
  generator.

- Exported the internal function `md5()` to calculate the MD5
  checksums of R objects. The function is essentially a workaround for
  `tools::md5sum()` (see HenrikBengtsson/Wishlist-for-R#21).

- For `fenced_block()`, a space is added between the backticks and the
  language name, e.g., ```` ```r ```` has become ```` ``` r ````
  now. This will affect snapshot tests based on Markdown ([an
  example](https://github.com/yihui/knitr-examples/commit/931e0a2)).

- Added a shorthand `fenced_div()` for `fenced_block(char = ':')`.

- `write_utf8()` returns the `con` argument (typically a file path)
  now. Previously, it returns `NULL`.

- Added an experimental function `new_app()` to create a local web application.

- The returned value of `yaml_body()` contains a new element `lines`
  in the list indicating the line numbers of YAML metadata if exists.

- Removed the `skip` argument from `split_source()`.

- For `split_source(line_number = TRUE)`, the attribute name for line
  numbers in the returned value was changed from `line_start` (a
  single starting line number) to `lines` (both the starting and
  ending numbers).

- Fixed an edge case in `prose_index()`, in which inline code was
  incorrectly recognized as a code block fence.

# CHANGES IN xfun VERSION 0.43

- Added a function `upload_imgur()`, which was adapted from
  `knitr::imgur_upload()`. The latter will call the former in the
  future. `xfun::upload_imgur()` allows users to choose whether to use
  the system command `curl` or the R package **curl** to upload the
  image. It also has a new argument `include_xml` to specify whether
  the XML response needs to be included in the returned value.

- Added a function `fenced_block()` to create a fenced block in
  Markdown (thanks, @cderv, yihui/knitr#2331). The block can be either
  a code block or a fenced Div.

- Fixed a bug in `xfun::record()` when the argument `verbose = 1` or `2`.