# CHANGES IN xfun VERSION 0.18
## NEW FEATURES
- Added a function `grep_sub()` to perform replacement with `gsub()` on elements
matched from `grep()`.
- Added a function `github_releases()` to obtain the tags from the Github
releases of a repo.
- Added a function `bump_version()` to increase the last digit of version
numbers by one.
- Moved a function `process_file()` from the **blogdown** package to this
package, and documented it.
- Added a function `valid_syntax()` to check if an R code fragment is
syntactically valid. This function was moved from the **highr** package.
- Added a function `url_filename()` to extract filenames from URLs.
This function is used by `download_file()` to determine the default
output filename.
- Added a function `do_once()` to perform a task once in an R session.
- Added a function `proj_root()` to find the root directory of a project.
Currently it only supports R package projects and RStudio projects by default.
- Added a function `relative_path()` to calculate the relative path of a path
relative to a directory.
- Added a function `from_root()`, which is similar to `here::here()` but
returns a relative path instead of an absolute path.
- Added a function `magic_path()` that, given an incomplete input path,
tries to find the actual path recursively under subdirectories of a root
directory. For example, users may only provide a base filename, and
`magic_path()` will look for this file under subdirectories and return
the actual path if it is found.
## MINOR CHANGES
- Now `download_file()` tries the download method `winnet` first (previously
it was `libcurl`) on Windows (thanks, @cderv, #33).
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