download_file: Download once

In runonce: Run Once and Save Result

Description

Download file if does not exist yet.

Usage

download_file(
  url,
  dir = tempdir(),
  fname = url_basename(url),
  overwrite = FALSE,
  mode = "wb",
  ...
)

Arguments

url	URL of file to be downloaded.
dir	Directory where to download the file.
fname	Base name of the downloaded file (dir will be prefixed).
overwrite	Whether to overwrite? Default is FALSE.
mode	See parameter of download.file(). Default of "wb" seems useful for Windows systems.
...	Arguments passed on to utils::download.file method Method to be used for downloading files. Current download methods are "internal", "wininet" (Windows only) "libcurl", "wget" and "curl", and there is a value "auto": see ‘Details’ and ‘Note’. The method can also be set through the option "download.file.method": see options(). quiet If TRUE, suppress status messages (if any), and the progress bar. cacheOK logical. Is a server-side cached value acceptable? extra character vector of additional command-line arguments for the "wget" and "curl" methods. headers named character vector of HTTP headers to use in HTTP requests. It is ignored for non-HTTP URLs. The User-Agent header, coming from the HTTPUserAgent option (see options) is used as the first header, automatically.

Value

Path to the downloaded (or existing) file.

Examples

download_file("https://github.com/privefl.png")
download_file("https://github.com/privefl.png")
download_file("https://github.com/privefl.png", overwrite = TRUE)

runonce documentation built on Oct. 2, 2021, 9:06 a.m.