# CHANGES IN xfun VERSION 0.23
## NEW FEATURES
- Added a `tinify()` function to compress PNG/JPEG images via [the Tinify API](https://tinypng.com/developers).
- Added a `news2md()` function to convert package news to the Markdown format. This is mainly for converting the plain-text `NEWS` file and the `NEWS.Rd` file to `NEWS.md`.
- Added a `format_bytes()` function to format numbers of bytes using a specified unit, e.g., `1024` can be formatted as `1 Kb`.
- When using `pkg_load2()` in an **renv** project, it will use `renv::install()` to install missing packages by default to take advantage of **renv**'s caching feature (thanks, @chunyunma @cderv, #52).
- `upload_win_builder()` no longer requires the system command `curl` to be available; if `curl` is not available, the R package **curl** will be used instead, which means this R package must be installed. In addition to uploading to the `ftp` server of win-builder, it's also possible to upload to <https://win-builder.r-project.org/upload.aspx>: call `upload_win_builder(..., server = 'https')`. This change was made so that it would be possible to continue to upload to win-builder in case it should stop supporting `ftp` (CRAN has discouraged package authors from using `ftp://`).
## BUG FIXES
- Backticks are added to math environments by mistake when `\begin{}` and `\end{}` do not match (thanks, @oliviergimenez, #51).
## MINOR CHANGES
- The argument `src` was renamed to `pkg` in `install_dir()`.
- The argument `file` of `upload_win_builder()` defaults to `pkg_build()` now, i.e., by default, it will build a source package and upload it, so you do not need to build the package separately.
# CHANGES IN xfun VERSION 0.22
## NEW FEATURES
- `relative_path()` is vectorized now.
- Added a new function `retry()` to retry calling a function for a number of times in case of errors.
- Added a new function `sort_file()`, which is a shorthand for `process_file(fun = sort)` to sort the lines in a text file.
## MAJOR CHANGES
- The argument `FUN` was renamed to `fun` in `process_file()`.
## MINOR CHANGES
- Inside `download_file()`, the `timeout` option in `options()` is set to 3600 seconds when it takes the default value of 60 seconds, which may not be enough for downloading large files (thanks, @matthewgson, yihui/tinytex#286).
# CHANGES IN xfun VERSION 0.21
## NEW FEATURES
- Added a new function `pkg_available()` to test if a package with a minimal version is available (thanks, @cderv, #45).
- Added a new function `set_envvar()` to set environment variables and return their old values, so they could be restored later.
- Added a new function `exit_call()` to call a function when a parent function exits.
- Exported the internal function `read_bin()`.
- Added an argument `verbose` to `bg_process()`.
- `Rscript_call()` gains an `options` argument to pass command-line options to `Rscript` (thanks, @cderv, #48).
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